In the notation, 1s₂, the number 1 represents the energy level where electrons are located. Therefore, option B is correct.
What is energy level ?The term energy level is defined as the fixed distances from the nucleus of an atom where electrons may be found. The energy levels are also called as electron shells.
The orbital occupied by the hydrogen electron is called a 1s orbital. The "1" represents the fact that the orbital is in the energy level closest to the nucleus. The "s" tells you about the shape of the orbital.
Thus, option B is correct.
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how many moles of kr are contained in 398 mg of kr?
a. 4.75 x 10-3 moles Kr b. 33.4 moles Kr c. 211 10-4 moles Kr d. 2.99 * 10-3 moles Kr e. 1.19* 10-4 moles Kr'
The stated statement states that 398 mg of Krypton contains 4.75 x 10-3 moles of Kr.
What it is in chemistry is KR?Krypton (Kr) is a naturally occurring element that is a rare gas belonging to Periodic Table Group 18 (noble gases). It only forms a small number of chemical compounds. Krypton is monoatomic, tasteless, colorless, and about 3.5 times heavier than air.
KR is a metal, right?Krypton is categorized as a chemistry element and then a nonmetal in the chemical world. William Gordon and his helper Morris Travers found it in 1898.
The molar mass of Kr is 83.80 g/mol.
So, moles = 398 mg / 1000 mg/g / 83.80 g/mol = 4.75 x [tex]10^{-3}[/tex] moles Kr
So, the answer is a. 4.75 x [tex]10^{-3}[/tex] moles Kr.
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a certain substance has a heat of vaporization of 49.21 kj/mol. at what kelvin temperature will the vapor pressure be 5.00 times higher than it was at 293 k?
The vapor pressure will be 5.00 times higher than it was at 293 k at 393 k.
The Clausius Clapeyron equation calculates the relationship between a substance's vapor pressure (P) and temperature to forecast the rate at which vapor pressure rises per unit increase in temperature (T).
A phase change from the liquid phase to the vapor phase is called vaporization of an element or molecule. Both evaporation and boiling result in vaporization.
To find the temperature at which the vapor pressure will be 5.00 times higher than it was at 293 K, we can rearrange the equation to solve for T: We know,
[tex]T = \frac{del H}{(R * ln\frac{P_2}{P_1} )} + 293[/tex]
where P₁ is the vapor pressure at 293 K and P₂ is the vapor pressure at the desired temperature. Plugging in the values, we get:
[tex]T = \frac{49.21}{8.314*ln(5)} +293[/tex]
Solving for T, we get a temperature of approximately 393 K
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examine other groups and periods in the periodic table to see if the same trends exist. what trends do you see in ionization energy down a group and across a period?
The ionization energy decreases within a group. The energy of ionization rises over time.
When looking at the periodic table of elements, what are the various trends that can be observed?Patterns in the elements of the periodic table are called periodic trends. Electronegativity, ionization energy, electron affinity, atomic radius, and metallic character are the most important trends.
What are the five periodic trends, and how important are each of them?The following are major periodic trends: electronegativity, the energy of ionization, electron affinity, the atomic radius, the melting point, and the metallic nature of the substance. The arrangement of the periodic table gives chemists a useful tool for quickly predicting an element's properties: periodic trends.
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why licl is a solid at room temperature but ncl3 is a liquid with a relatively low boiling point in terms of attractive forces between particles
Answer:
Explanation:
The difference in the physical state of LiCl and NCl3 at room temperature is due to the difference in their intermolecular attractive forces.
LiCl has strong ionic bonds, which are strong attractive forces between positive and negative ions. These strong attractive forces result in a high melting and boiling point, making LiCl a solid at room temperature.
NCl3, on the other hand, has weaker covalent bonds, which are attractive forces between atoms in a molecule. These weaker attractive forces result in a lower melting and boiling point, making NCl3 a liquid with a relatively low boiling point at room temperature.
The strength of intermolecular forces is determined by the type of bond and the molecular structure. Ionic bonds are stronger than covalent bonds, and the stronger the bond, the higher the melting and boiling points of a substance.
how many moles are in 4.5 x 1022 molecules/atoms of co2?
There are 0.075 moles of CO2 are present in 4.5 x 1022 molecules/atoms of co2
Mole — what is it?Mole is stated as the quantity of a material that consists 6.022 X 1023 entities of the supplied substance, such as particle, atoms, ion, molecules, etc. The quantity of atom, ions, or molecules is measured in moles.
One mole of a substance is defined as having Avogadro's number of entities (atoms, molecules, ions, etc.). Avogadro's number is defined as 6.022 x 10^23 entities per mole.
So, to convert from the number of entities to the number of moles, divide the number of entities by Avogadro's number:
4.5 x 10^22 entities / 6.022 x 10^23 entities/mol = 0.075 moles
Therefore, 4.5 x 10^22 CO2 molecules/atoms is equivalent to 0.075 moles of CO2.
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a 10.0 ml aliquot of a liquid is found to have a mass of 7.883 grams. calculate the density of this liquid.
The density of the liquid is: 0.7883 g/ml
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
The formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
m = 7.883 gv = 10.0 mld = ?Applying the density formula we get:
d = m /v
d = 7.883 g /10.0 ml
d = 0.7883 g/ml
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the ph of a solution prepared by the addition of 10. ml of 0.002 m koh(aq) to 10. ml of distilled water is closest to
The pH of a solution prepared by the addition of 10 ml of 0.002 M KOH (aq) to 10 ml of distilled water is closest to 13.
The addition of 10 ml of 0.002 M KOH to 10 ml of distilled water results in a final concentration of 0.002 M KOH in the solution. This concentration of KOH will result in a high hydroxide ion concentration, which will make the solution basic with a pH greater than 7.
The pH of a solution is a measure of its acidity or basicity and is defined as the negative logarithm of the hydrogen ion concentration. A pH of 7 is neutral, a pH less than 7 is acidic, and a pH greater than 7 is basic.
The pH of the solution can be calculated using the equation:
pH = -log[OH-]
Since the concentration of hydroxide ions, [OH-], is equal to the concentration of KOH, 0.002 M, the pH of the solution is:
pH = -log(0.002) = 2 + log(10^3) = 2 + 3 = 5
Therefore, the pH of the solution is closest to 13.
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pH of diluted solution = 11
Explanation:It is given that 10 mL of a 0.002 M KOH(aq) solution is diluted by adding 10 mL of distilled water. We are required to then calculate the pH of the diluted solution.
To solve this question, we can break it up into 3 sections:
The dilution of the initial solution.Calculation of pOH of diluted solution.Calculation of pH from pOH.Firstly, what is pH?pH, short for 'potential of hydrogen' is a scale used to measure the acidity of substances, where 0 is most acidic, and 14 is least acidic. pH is calculated with the formula:
[tex]\boxed{\large\textsf{$\sf pH=-\log_{10}\left[H^+\right]$, where $\rm \left[H^+\right]$ = concentration of H$^+$ ions}}[/tex]
Similarly, pOH is used to measure the basicity of substances, where 0 is the most basic, and 14 is the least basic. pOH is calculated with the formula:
[tex]\boxed{\large\textsf{$\sf pH=-\log_{10}\left[OH^-\right]$, where $\rm \left[OH^-\right]$ = concentration of OH$^-$ ions}}[/tex]
The mathematical relationship between pH and pOH is such that:
[tex]\boxed{\Large\textsf{14 = pH + pOH}}[/tex]
Step 1:First we need to calculate the concentration of the diluted solution. To do this, we can use the dilution formula, c₁V₁ = c₂V₂, where the subscripts 1 and 2 denote initial and final respectively.
Hence, c₁ = 0.002 M, V₁ = 0.010 L, and V₂ = 0.010+0.010=0.020 L. Rearranging to find c₂:
[tex]\large\textsf{$\sf\displaystyle c_2=\frac{c_1V_1}{V_2}=\frac{0.002\times 0.010}{0.020}$}\\\\\boxed{\boxed{\large\textsf{$\sf\displaystyle\therefore concentration\ of\ diluted\ solution=0.001$ M }}}[/tex]
Step 2:If we consider the dissociation reaction of KOH, which is a strong base and will fully dissociate into its ions:
[tex]\Large\text{$\rm KOH_{\,(aq)}\leftrightharpoons K^+_{\ (aq)}+OH^-_{\ (aq)}$}[/tex]
We can see that there is a 1:1 stoichiometric ratio between KOH and OH⁻ and therefore concentration of KOH = concentration of OH⁻.
Therefore, we can calculate pOH:
[tex]\boxed{\boxed{\large\textsf{$\sf\therefore pOH=-\log_{10}\left[0.001\right]=3$}}}[/tex]
Step 3:Finally, we can use the fact that pH + pOH = 14 and so pH = 14 - pOH.
Therefore, pH = 11
[tex]\hrulefill[/tex]
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Which two statements in the table are true about the changing salt concentrations of ocean water?
When Earth's ice increases, ocean water gets less salty and when water evaporates from the oceans, the remaining water becomes more salty. Therefore, the correct option is option 2,3.
What is concentration?Concentration in chemistry refers to the quantity of a material in a certain area. The ratio of the solute in a solution to the solvent or whole solution is another way to define concentration.
Concentration may be expressed as per unit mass rather than volume. Although concentration is often used to describe chemical solutions, it may be computed for any combination. When Earth's ice increases, ocean water gets less salty and when water evaporates from the oceans, the remaining water becomes more salty are true about the changing salt concentrations of ocean water.
Therefore, the correct option is option 2,3.
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you add 5.2 g of iron to 20.50 ml of water and observe that the volume of iron and water together is 21.16 ml . calculate the density of iron.
The density of the iron is 7.87 g/cm3 when 5.2 g of iron to 20.50 ml of water and volume is 21.16 ml.
Given data in the question is:
Mass of iron is 5.2 g.
Water is 20.50 ml.
Combined volume of iron and water is 21.16 ml.
The density of the iron is Mass/Volume.
Final volume of water = 21.16 - 20.50 = 0.66 ml
Density = 5.2 / 0.66 = 7.87 g/cm3.
Density is a measure of mass per unit volume. It is an intensive property, meaning that its value does not change depending on the size of the object.
Density Meaning in Physics: In physics, density is the ratio of the mass of an object to its volume. It is often defined as mass per unit volume.
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how does one coulomb of charge compare with the charge of a single electron?
A coulomb, or 1 C, has a mass of 6.25 1018 electrons. 6.25 billion billion electrons, to be exact.
Who or what is an electron?A negatively charged neutrino known as an electron can either be free or attached to an atom (not bound). One of the three main types of molecules within an atom is an atom that is bonded to it; the other two being protons and neutrons.
Which also goes by the name electron?Today, electrons are the name given to these negative charges cathode ray particles. Electrons are incredibly light, negatively charged particles. The total number atomic protons and neutrons in an atom equals the mass of that atom. .
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why is it important to allow a sterilized inoculating loop to cool before attempting to sample liquid culture?
It is important to allow a sterilized inoculating loop to cool before attempting to sample liquid culture because it avoids killing of microorganisms.
It is important to cool the inoculating loop prior to obtaining a bacterial sample because the high heat in loop could kill the bacteria once they touch our loop. Bacteria might be versatile in nature, but they cannot handle a 400 degree hot metal loop.
We must allow our loop or needle to cool before our try to pick up our organism. If we pick up organism with a hot tool, oour cells will be killed. To cool our loop or needle quickly, place it on a section of agar that is uninoculated or is at least different from the area from which we will pull cells.
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a molecule has two bonded atoms around the central atom. the central atom does not have any lone pairs. what is the geometry of the molecule?
a molecule has two bonded atoms around the central atom. the central atom does not have any lone pairs. The molecule has a linear geometry.
A molecule with two bonded atoms around the central atom and no lone pairs on the central atom has a linear geometry. This is because the repulsion between the two bond pairs is equal in magnitude and opposite in direction, leading to a 180 degree bond angle between the bonds. The bond angles in a linear molecule are always 180 degrees and the molecule has a straight line shape is observed in many molecules, such as CO2 and N2, and is also observed in some diatomic (two-atom) molecules, such as H2 and Cl2.
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determine the molality of a solution of water dissolved in ethanol for which the mole fraction of water is 0.492.
The molality of a solution of water dissolved in ethanol is 0.0273 for which the mole fraction of water is 0.492.
Given the mole fraction of water (x_water) in the solution of water and ethanol, the molality (m) can be calculated as follows:
= m
= (x_water) / (MW_water)
where MW_water is the molecular weight of water (18.015 g/mol).
= m
= (0.492) / (18.015 g/mol)
= 0.0273 mol/kg
Therefore, the molality of the solution of water and ethanol is 0.0273 mol/kg.
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chloroform (chcl3), an important solvent, is produced by a reaction between methane and chlorine. ch4(g) 3 cl2(g) chcl3(g) 3 hcl(g) how many grams of ch4 is needed to produce 40.0 g chcl3?
The chemical name is CHCl3. It is a common, thick, colorless liquid with a pleasant fragrance.
Chloroform may be released into the air as a result of its production during the chlorination of drinking water, wastewater, and swimming pools. Chloroform, a substance used in industry, is a lacrimator.
From CH4 + 3 Cl2 comes CHCl3 + 3 HCl.
One molecule of CHCl3 and three molecules of HCl were produced when three molecules of Cl and one molecule of CH4 were mixed.
This predicts a 1:1 ratio between CH4 and CHCl3.
Due to the 1:1 ratio, the amount of CHCl3 produced is 66.5/119.5 (molar mass of CHCl3), or 0.556 moles, and the amount of CH4 produced is 0.556 moles mass, or 0.556 x 16 (molar mass of CH4), which equals 8.896 grams.
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40.0 g of a solute is dissolved in 500. ml of a solvent to give a solution with a volume of 495 ml. the solvent has a density of 1.00 g/ml. which statement about this solution is correct?
40.0 grams of a solute is dissolved in 500 milliliters of a solvent with a density of 1.00 g/ml to produce a solution with a volume of 495 ml. The concentration of the solution is 0.08081 g/ml
Solution Concentration CalculationIn this solution, 40.0 grams of a solute is dissolved in 500 milliliters of a solvent with a density of 1.00 g/ml to produce a solution with a volume of 495 ml. The concentration of the solution can be calculated by dividing the mass of the solute (40.0 g) by the volume of the solution (495 ml). The result of this calculation is 0.08081 g/ml, which represents the concentration of the solution. This means that in every milliliter of the solution, there are 0.08081 grams of the solute. It's important to note that the concentration of a solution is an expression of how much solute is present in a given volume of the solvent and is usually expressed in units of grams per milliliter (g/ml) or moles per liter (M).
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What caused Andy Warhol to create so
many paintings of soup cans?
Answer:
The reason he painted soup cans is that he liked soup." He was thought to have focused on them because they composed a daily dietary staple. Others observed that Warhol merely painted things he held close at heart. He enjoyed eating Campbell's soup, had a taste for Coca-Cola, loved money, and admired movie stars.
when a solution with a nonvolatile solute is prepared, which of the following will definitely decrease relative to the pure solvent? select all that apply. select all that apply: freezing point of solution vapor pressure of solution boiling point of solution all of the above
When a solution with a nonvolatile solute is prepared, the freezing point and boiling point of the solution will decrease relative to the pure solvent.
Effect of Nonvolatile Solute on the Freezing Point and Boiling Point of a SolutionWhen a solution is prepared by dissolving a nonvolatile solute in a solvent, the presence of the solute particles in the solvent affects the behavior of the solution as compared to the pure solvent. The solute particles interfere with the normal packing of solvent molecules, which leads to a decrease in the intermolecular forces between solvent molecules. As a result, the solution requires less energy to freeze or boil compared to the pure solvent. This is why the freezing point and boiling point of the solution are lower than that of the pure solvent. The decrease in the freezing and boiling points is proportional to the concentration of solute particles in the solution. On the other hand, the vapor pressure of the solution is not greatly affected by the presence of the solute, as the solute particles do not evaporate with the solvent.
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assuming an efficiency of 49.20%, calculate the actual yield of magnesium nitrate formed from 148.4 g of magnesium and excess copper(ii) nitrate.
To calculate the actual yield of magnesium nitrate, you need to know the theoretical yield and then compare it to the actual yield. The theoretical yield is calculated based on the balanced chemical equation for the reaction between magnesium and copper(ii) nitrate. The actual yield is the amount of magnesium nitrate that was actually produced during the reaction.
About Magnesium NitrateMagnesium nitrate refers to the inorganic compound with the formula Mg(NO₃)₂ₓ, where x = 6, 2, and 0. These are all white solids. The anhydrous material is hygroscopic, quickly forming hexahydrate when in air. All salts are highly soluble in water and ethanol.
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Calculate the theoretical mass percent of barium in BaCl2 . 2H2O.
Answer:
56.26%
Explanation:
The theoretical mass percent of barium in BaCl2 . 2H2O can be calculated as follows:
First, find the molar mass of BaCl2 . 2H2O:
BaCl2 . 2H2O = Ba + 2Cl + 2(H2O)
= 137.327 + 2 x 35.45 + 2 x 18.015
= 244.297 g/mol
Next, find the mass of barium in one mole of BaCl2 . 2H2O:
Ba = 137.327 g
Finally, divide the mass of barium by the total mass and multiply by 100:
(137.327 g / 244.297 g) x 100% = 56.26%
So, the theoretical mass percent of barium in BaCl2 . 2H2O is 56.26%.
calculate the boiling point (in degrees c) of a solution made by dissolving 9.70 g of naphthalene {c10h8} in 90.7 g of benzene. the kbp of the solvent is 2.53 k/m and the normal boiling point is 80.1 degrees c.
The boiling point of the solution made by dissolving 9.70 g of naphthalene in 90.7 g of benzene is 139.3 °C.
The boiling point of a solution is elevated compared to the boiling point of the pure solvent, due to the presence of solute particles in the solution. The boiling point elevation can be calculated using the following equation:
ΔT = Kb x molality
where ΔT is the change in boiling point, Kb is the boiling point elevation constant, and molality (m) is the concentration of the solute expressed in mol/kg.
To use this equation, we first need to find the molality of the naphthalene in the solution. To do this, we need to find the number of moles of naphthalene in the 9.70 g sample:
9.70 g naphthalene / 128.17 g/mol
=> 0.0758 mol naphthalene
Next, we need to find the mass of the solvent in the solution, which is 90.7 g. The molality of the naphthalene can then be calculated as follows:
molality = moles solute / mass of solvent (in kg)
=> 0.0758 mol / (90.7 g / 1000 g/kg)
=> 0.0837 mol/kg
Now that we have the molality, we can calculate the boiling point elevation:
ΔT = Kb x molality
=> 2.53 K/m x 0.0837 mol/kg
=> 0.2111 K
Finally, we can use the boiling point elevation to find the boiling point of the solution:
Boiling point of solution = boiling point of solvent + ΔT
=> 80.1 °C + (0.2111 K x 273.15)
=> 80.1 + 59.18
=> 139.3 °C
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What type of molecules are found in living things and contain both carbon and hydrogen?
The building blocks of life are known as organic molecules, which are found in all living organisms and contain both carbon and hydrogen.
What are organic molecules?Living creatures possess organic molecules that are composed of both carbon and hydrogen. Organic molecules are the basis of life and are essential for many biological functions, including energy storage, communication, and structural support. Carbohydrates, lipids, nucleic acids, and proteins are some examples of organic compounds.These molecules include proteins, lipids, nucleic acids, and carbohydrates.
Sugars like glucose and fructose are examples of carbohydrates, which give cells energy. Various compounds known as lipids are used as insulation and energy storage. DNA and RNA are two examples of nucleic acids that store and convey genetic information.
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the mineral halite has cube-shaped crystals because: group of answer choices there are no planes along which the mineral can break cubes are the most common way two tetrahedron can join of the arrangement of atoms in the crystal lattice halite is soluble in water
The cube-shaped crystals of halite are due to the arrangement of atoms in the crystal lattice.
Halite is a type of salt with a simple cubic crystal structure, where the sodium and chloride ions are arranged in a repeating pattern in three dimensions. This arrangement gives rise to the cube-shaped crystals that are characteristic of halite.
The cube-shaped crystals of halite are due to the arrangement of atoms in the mineral's crystal lattice. Halite is a type of salt that has a simple cubic crystal structure, where sodium and chloride ions are arranged in a repeating pattern in three dimensions. The repeating pattern of ions in the crystal lattice gives rise to the cube shape of the crystals. The crystal shape is not related to the fact that halite is soluble in water or to the way two tetrahedron can join. Instead, the cube shape is a result of the arrangement of the atoms in the crystal lattice.
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Which statement best describes the relationship between changes in air pressure and wind speeds? Responses When a high- and a low-pressure air mass are far apart, air moves quickly from low to high pressure. When a high- and a low-pressure air mass are far apart, air moves quickly from low to high pressure. When a high- and a low-pressure air mass are close together, air moves slowly from high to low pressure. When a high- and a low-pressure air mass are close together, air moves slowly from high to low pressure. When a high- and a low-pressure air mass are far apart, air moves slowly from high to low pressure. When a high- and a low-pressure air mass are far apart, air moves slowly from high to low pressure. When a high- and a low-pressure air mass are far apart, air moves quickly from high to low pressure.
The statement that best describes the relationship between changes in air pressure and wind speeds is:
When a high- and a low-pressure air mass are far apart, air moves quickly from low to high pressure.How does air move?Air moves in response to differences in atmospheric pressure. When there is a difference in pressure between two points, air will flow from high pressure to low pressure in an effort to balance out the difference. This flow of air creates wind.
The movement of air can also be influenced by the Earth's rotation and the heating of the Earth's surface by the sun, which creates complex patterns of air movement, including fronts, jet streams, and cyclones.
In general, wind moves from areas of high pressure to areas of low pressure in an effort to balance out differences in atmospheric pressure. The faster the pressure gradient, the stronger the wind speeds will be. When a high-pressure and a low-pressure air mass are far apart, the pressure gradient is steeper and the wind speeds are stronger.
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What determines whether or not an atom is reactive?
The number of valence electrons, the electrons found in the outer electron shell of the atom, determines whether or not an atom reactive.
Reactivity is the property of an atom in which it is either likely or unlikely to form a bond with another atom to create a molecule. The three types of bonds are ionic, covalent, and metallic. The Atoms seek to fill their valence shell with eight electrons but not all atoms will have enough electrons to achieve that goal. If an atom has less than eight valence electrons it is more likely to bond with other atoms to share electrons and artificially fill the valence shell of both atoms. The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell. Elements in the periodic table whose outermost shells are filled with electrons (8). Helium, neon, and argon are examples of noble gas elements. They are very non-reactive. The atoms are most stable, least reactive, when their outermost electron shell is full. Most of the elements important in biology need eight electrons in their outermost shell in order to be stable, and this rule of thumb is known as the octet rule.
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choose atomic radius from the drop-down menu to see the relative sizes of the elements. in which parts of the table do you find the largest and smallest atoms?
The atoms of cesium (Cs) have the largest atomic radius on the periodic table.
Cesium has the chemical symbol Cs and the atomic number 55. It's a soft, silvery-gold alkali metal with a melting point of twenty-eight point five degrees Celsius (83.3 degrees Fahrenheit), making it one of only five elemental metals that's liquid at or near room temperature. Cesium shares physical and chemical properties with rubidium and potassium. Cesium is found in the Earth's crust at a concentration of about 3 parts per million on average. It's most commonly found in atomic clocks, photoelectric cells, and medical treatments.
A photoelectric cell is a type of photodetector in which light energy is converted into electrical energy. It is made of a semiconductor material that, when exposed to light, emits electrons. It is used in a variety of applications, including security systems, cameras, and solar cells. Photoelectric cells were one of the first forms of renewable energy, and they can be found in a variety of applications such as solar cells, security systems, and cameras. They're also used in industrial settings to control motors, automatic door openers, and traffic lights.
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by what percentage does the absorbance decrease if 12.25 ml of water is added to a 16.75 ml sample of 0.500 m cr3 ?
According to Beer-Lambert law, absorbance will also decrease by 42.4%
In chemistry, awareness is the abundance of a constituent divided by using the whole extent of an aggregate. several styles of mathematical description can be outstanding: mass concentration, molar awareness, quantity concentration, and volume awareness.
In technology, the amount of a substance, which includes salt, this is in a positive amount of tissue or liquid, along with blood. A substance becomes more concentrated while much less water is present. The concentration of the solution may be expressed in molarity, molality, normality, mole fraction, and many others. the attention of a substance is the amount of solute present in a given quantity of answer. Concentrations are commonly expressed in phrases of molarity, defined as the variety of moles of solute in 1 L of answer.
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13. what observational evidence do you have to support that combustion is a chemical change? an appropriate answer requires a minimum of two pieces of evidence. there is observational evidence that have to support that combustion is a chemical change. burning steel wheel, candle, sulfur, splint, results in the formation of new chemical.
Burning a steel wheel, a candle, some sulfur, or a splinter produces new chemicals which is an observable evidence that suggests combustion is a chemical transformation.
The five elements of chemical change are: color change, precipitate or gas production, gas formation, odor change, and temperature change. A chemical reaction in which both light and heat can be seen is the burning of wood. We refer to a reaction as being exothermic when it produces heat. In other words, heat is transmitted from the reactants to the environment outside. When a chemical interacts with oxygen to release energy, a combustion event will always take place. For instance, methane burns in oxygen and produces carbon dioxide and water as byproducts. The oxidation of the carbon in the methane is demonstrated by the production of carbon dioxide. Also, burning of substance results in the release of heat and light energy, which is a sign of chemical change.
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what is the atomic number for an element whose mass number is 152, which contains 90 neutrons per atom?
The atomic number for an element with a mass number of 152 and 90 neutrons per atom is 62, which corresponds to the element samarium.
What is samarium element?
Samarium is a silvery-white metal that is highly reactive, but it has no known biological role. It is found in small amounts in the Earth's crust and is mainly used in certain types of magnets and in certain types of nuclear reactors.
Calculation of atomic number:
The atomic number is the number of protons in the nucleus of an atom and is equal to the number of electrons in a neutral atom. Since the mass number is the sum of protons and neutrons in an atom, and the number of neutrons in this atom is 90, the number of protons must be [tex]152 - 90 = 62[/tex].
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write both the structure and name for each of the eight alkanes with unbranched carbon chains starting with one carbon and ending with eight carbons.
1. CH4, Methane
2. C2H6, Ethane
3. C3H8, Propane
4. C4H10, Butane
5. C5H12, Pentane
6. C6H14, Hexane
7. C7H16, Heptane
8. C8H18, Octane
Alkanes are a class of organic compounds made up of only carbon and hydrogen atoms. They are also known as "saturated hydrocarbons," as all of the carbon-carbon bonds are single bonds and there are no double or triple bonds between the carbon atoms.
The eight alkanes listed above are unbranched, meaning that they have a straight chain of carbon atoms, with no branches or side chains.
Each of these eight alkanes has a different number of carbon atoms, ranging from 1 carbon in methane to 8 carbons in octane. The naming convention for alkanes is based on the number of carbon atoms in the molecule, with the suffix "-ane" added to the end.
For example, ethane has 2 carbon atoms, and so it is named "ethane," while heptane has 7 carbon atoms, and so it is named "heptane."
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we can only do ideal calculations when we are at standard temperature and pressure. True or False
It is true that under conditions of normal pressure and temperature, we can only make perfect calculations.
How hot and how pressured is it typically?STP, or average temperature and humidity, refers to the conventional air temp at sea level. The temperature and pressure are, respectively, 0 °C and 1 atm.
Why do scientists use standard temperature and pressure?It is now easier to compare different measurements for gases, such as the quantity of gas molecules in a given volume. There has to be a universal standard for pressure and temperature so that scientists may meaningfully compare various sets of data.
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