Although the valence electron structures of the atoms of each element in a vertical column are often the same, the number of energy levels in the atoms increases as the elements descend the column.
How are elements with the same vertical group related in terms of their electron configuration?Because of their comparable chemical behavior, the vertical columns of the periodic table are referred to as groups or families. A family of elements' members share the same valence electron count and chemically similar characteristics.
Why are the characteristics of the components within the same vertical column similar group?Periods and groups are the names of the horizontal rows and vertical columns, respectively. Chemical characteristics of elements within the same group are comparable. Due to the fact that they have an equal number of outside
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Discuss two properties of the atomic structure of copper that make it a good conductor.
The two properties of the atomic structure of copper that make it a good conductor is:
In copper, there is enough heat energy at ordinary room temperatures to liberate a vast number of weakly held valence electrons. The presence of a large number of free electrons in copper, as in other metals, is what makes it a good conductor of electricity.In copper, at normal room temperature, there is enough thermal energy to eject a large number of weakly held valence electrons. Like other metals, copper has a large number of free electrons, which makes it a good conductor of electricity.
In order for current to flow through metal, the current source must fight resistance. The lower the resistivity, the higher the electrical conductivity of the metal. Copper wire is also a good electrical conductor due to its low resistivity.
Other materials sometimes used as conductors are silver, gold, and aluminum. Copper is still the most popular material for wire because it is a very good conductor of electricity and is very cheap compared to gold and silver.
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Acetyl-coa enters the citric acid cycle by reacting with ________ to form ________.
Acetyl-CoA enters the citric acid cycle by reacting with oxaloacetate to form citrate.
Acids are molecules or ions that can donate protons, known as Bronsted-Lowry acids, or form covalent bonds with electron pairs, known as Lewis acids. The first category of acids is proton donors or Brønsted-Lowry acids.
There are two main types of acids: organic acids and inorganic acids. Inorganic acids are sometimes called mineral acids. As a category, organic acids are often weaker than inorganic acids. The basic difference between the two is that organic acids contain carbon whereas inorganic acids do not. Natural Acids: These acids are found in foods. For example, acetic acid, tartaric acid, and lactic acid. Mineral or Inorganic Acids: These acids are used in various laboratory processes such as hydrochloric acid, and sulfuric acid.
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An aluminum-containing compound has the formula mgxalyo4 and is 44. 98% oxygen by mass. What is the value of the subscripts x and y?.
The value of the subscripts x is 1 and y is 2.
ω(O) = 44.98% ÷ 100%
ω(O) = 0.4498; mass percentage of oxygen in the compound
M(compound) = 4 × 16 g/mol / 0.4498
M(compound) = 142.3 g/mol; molar mass of the compound
Oxidation number of oxygen atom in the compound is -2, for oxygen atoms total charge is -8.
Magnesium and aluminium must have total charge of +8 in the compound.
Magnesium has oxidation number +2.
Aluminium has oxidation number +3.
x is amount of magnesium atoms.
y is amount of aluminium atoms.
x × (+2) + y × (+3) = +8
x must be 1 and y must be 2.
M(compound) = M(Mg) + 2M(Al) + 4M(O)
M(compound) = 24.3 g/mol + 2×27 g/mol + 4×16 g/mol
M(compound) = 142.3 g/mol.
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Lauren walks 90 m in half a minute. What must her speed have been to travel this
distance?
90.5 m/min
0.006 m/min
45 m/min
O 180 m/min
Clear selection
A concentrated salt solution has a mass of 5.34 g for a 5.00 ml sample. what is the specific gravity of this solution?
The specific gravity of the solution is 1.07, which contains 5.34g for a 5.00ml sample.
Density of a substance is
Density = Mass / Volume
= 5.34/5
= 1.07
Density of water = 1
Specific gravity = Density of substance/density of solvent
Specific gravity = 1.07 / 1
Specific gravity = 1.07
Specific gravity, often known as relative density, is the ratio of a substance's density to that of an industry standard.
If a material has a relative density that is less than 1 compared to the reference, it is less dense than the reference; if it is larger than 1, it is denser. Identical volumes of the two substances have the same mass if the relative densities are equal, or exactly 1.
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A 33.9g sample of lead is placed in a graduated cylinder containing 20.0mL of water.
The lead sinks to the bottom. If the density of lead is 11.4g/cm³, what will the final
volume read on the graduated cylinder?
The correct answer for the final volume read on the graduated cylinder = 4.72 ml ^3 .
density of lead is 11.4g/cm³,
quantity of water = 20.0 mL = 20 gram
sample of lead = 33.9 g
density = mass / volume
total mass = 20+ 33.9 = 53.9
volume = mass/ density
volume = 53.9/ 11.4
volume = 4.72 ml ^3
Graduated cylinders are long, slender vessels used to measure liquid volumes. They are not meant to be mixed, stirred, heated, or weighed. Graduated cylinders typically range in size from 5 mL to 500 mL. It is a tall narrow container with a volume scale used specifically for measuring liquids. These 100 mL glass graduated cylinders are used to accurately and easily measure and dilute liquids! These class-A, lab-quality graduates are built to deliver precise measurements while resisting breakage and a wide range of chemicals. A plastic volume marker is included.
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Crack is made by taking powdered cocaine hydrochloride and adding sodium bicarbonate and water. True or false
The molecular formula for glucose is c6h12o6. What would be the molecular formula for a molecule made by linking three glucose molecules together by dehydration reactions?.
C₁₈H₃₂O₁₆ is the molecular formula called a-maltotriose for a molecule made by linking three glucose molecules together by dehydration reactions.
It is a dehydration reaction, it means that when two molecules are linked together, there will be one molecule of water H₂O removed
A-maltotriose molecule is a trisaccharide molecules which means linkage of three glucose molecules linked with 1,4 glycosidic bond this is called as a-maltotriose which is formed in the reaction as product
The reaction will be:
C₆H₁₁O₅-OH+H-C₆H₁₀O₅-OH+H-C₆H₁₁O₆→C₁₈H₃₂O₁₆+2H₂O
Here one molecule of water H₂O removed.
Therefore molecular formula of the molecule formed will be C₁₈H₃₂O₁₆.
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A solution with ph 4 has __________ the h concentration of a solution with ph 8.
A solution with ph 4 has 10000 times the h concentration of a solution with ph 8.
the solution, in chemistry, is a homogeneous mixture of two or more substances whose relative amounts can be varied continuously up to the so-called solubility limit. The term solution is usually applied to the liquid state of aggregation, but gaseous and solid solutions are also possible. Hypotonic, isotonic, and hypertonic solutions (tonic).
A solution is a homogeneous mixture of two or more components with particle sizes less than 1 nm. Common examples of solutions are the sugar in water and salt in water, soda water, etc. In solution, all components appear as a single phase.
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As the wavelength of an electromagnetic wave gets longer, the frequency ____________________.
What group is obtained by adding or deleting from each of the following groups the indicated symmetry operation?
a) c3 plus i
b) c3v plus i
c) c3h minus s35
d) c3 plus s6
In the group that is obtained by adding or deleting from each of the following groups, the indicated symmetry operation is c3 plus i. The correct option is a.
What are symmetries?In organic chemistry, the shape of the compounds that are formed is made or discovered. The shape of water molecules, benzene, etc. These structures of symmetries are sent by the connecting or joining of elements with bonds.
Citroën C3 is an organic compound that gives symmetry operation when a group or added or deleted from the compound.
Thus, the correct option is a. c3 plus i.
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Which substance is likely to contain the highest percentage of double bonds in the hydrocarbon chains of its triglycerides?
Olive oil substance is likely to contain the highest percentage of double bonds in the hydrocarbon chains of its triglycerides.
In organic chemistry, hydrocarbons are organic compounds composed entirely of hydrogen and carbon. [1]:620 hydrocarbons are examples of group 14 hydrides. Hydrocarbons are generally colorless and hydrophobic, and their odor is usually faint or exemplified by the liquid odor of gasoline or lighters. They come in a variety of molecular structures and phases.
Examples of hydrocarbons include gasoline, kerosene, lamp oil, and furniture oil. If someone accidentally drinks a hydrocarbon product that gets into their lungs, it can cause breathing problems. Severe injury or even death can result. Hydrocarbons are the primary energy storage molecules of all major fossil fuels (including coal, oil, and natural gas) and biofuels. It is also a raw material in the manufacturing process of many types of plastics.
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An atom is composed of a central nucleus which is surrounded by which orbiting particles?
An atom is composed of a central nucleus which is surrounded by electrons.
What is nucleus?A nucleus is the organelle within a cell that is membrane-enclosed and contains the chromosomes, according to genomics. Numerous holes in the nuclear membrane allow for the selective passage of certain molecules (such proteins and nucleic acids) into and out of the nucleus.
Protons, which have a positive charge, and neutrons, which have no electrical charge, make up the nucleus. Quarks are subatomic particles that make up protons and neutrons.
DNA is organised into chromosomes in the nucleus, which is located in the centre of the cell. The double nuclear membrane (outer and inner) that separates the nucleus from the cytoplasm, known as the nuclear envelope, envelops it. The rough endoplasmic reticulum and the outer membrane are one unit.
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A chemist can determine the mass of K in a sample of known mass that consists of either pure K2O or pure K2O2. From this information, can the chemist answer the question of which compound is in the sample?
Yes , the chemist can answer if the compound in K2O or K2O2
The chemical formula and composition of both the compounds is entirely different. The compound K2O2 has an additional molecule of oxygen than K2O and hence will have have higher molecular mass.
In the compound K2O
molecular mass= 2x 39+16 =94
mass ratio of K in compound= 78/94 = 0.830
In the compound K2O2
molecular mass= 2x 39+16X2 =110
mass ratio of K in compound= 78/110 = 0.710
and hence by the required ratio while extracting K , the chemist may know if the compound is K20 or K2O2
If the ratio is anything different from 0.830 and 0.710 then the compund will be something different
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3.7+5.894+782.52=
in sig fig rules
In scientific notation, "significant figures" refers to the significant single digits (0 to 9, inclusive) of the coefficient of expression.
What do you mean by significant numbers using an example?A significant figure in a given number is made up of all the certain digits plus one uncertain digit. They are reliant on the scale's or measurement tool's accuracy.
What is the example of significant figure?1. 587 is an example of four important digits (three are certain and one is doubtful).
What is the calculation of the above problem?On solving above problem we get,
3.7 + 5.894 + 782.52
9.594 + 782.52
792.114
792.1
The answer of the above problem is 792.1.
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The reduction of a molecule can sometimes result in the acquisition of a proton, a reaction referred to as:______.
The reduction of a molecule can sometimes result in the acquisition of a proton, a reaction referred to as hydrogenation.
What is hydrogenation?
Molecular hydrogen (H2) and another substance or element undergo a chemical reaction known as hydrogenation, typically in the presence of a catalyst such as nickel, palladium, or platinum. The method is frequently used to saturate or decrease organic molecules.
To turn an oil that is liquid into a solid fat. Hydrogenation, sometimes in conjunction with other procedures like interesterification or fractionation, may offer a technique to manufacture the needed fat when solid fats of the proper consistency are expensive or unavailable.
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7. Which of the following is a molecule?????
(A) K (C) Na
(B) Ne (D) HI ......
Answer:
the answer is
(D) HI
Explanation:
Compare atomic number with lowest and highest
wavelengths in spectrum. is there a pattern? what might explain the
presence or absence of a pattern based on what you know about atoms,
electrons, and emission spectra (it's a sentence the answer must be in a sentence)
The increase in the atomic number increases the frequency and spectral lines in the spectrum. The addition of the number of electrons and energy increases the lines of the emission spectrum.
What is spectrum?Spectrum has been defined as the light colors emitted by the atom of varying frequencies and wavelengths. The electron has been known to travel from lower to higher energy levels. This leads to the emission of light.
According to the principal quantum number, the addition of the electrons increases the energy and in turn, increases the lines of spectrum emission.
Therefore, the atom number directly relates to the spectrum line.
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Benny pushes a 20 kg crate from rest. If the crate accelerates at a rate of 3 m/s2, what is the amount of force applied for it to move?
Answer:
60 N.
Explanation:
The force formula of acting on an object is F=ma.
This means that...
F= force
M - mass
A = acceleration
So to solve this you have to solve for F.
F=ma
F=(20kg)(3m/s^2)
F= 60 N.
I hope this helps, have a good day! :D
HELP, as much as i try to understand i cant
The table is based on the periodic table and is to be filled by finding out various elements of periodic table
Disclaimer:
The table given below is not clear and hence only general idea can be provided
The table is based on the idea of periodic table where various constituents such as mass number, overall charge , total particles, number of protons have been asked to be labelled.
Sodium has been solved as an example and various postulates of Cu is being provided to solve accordingly
In the constituents of element Cu
Name- Cuprous and Cupric
Atomic number-29
Mass number-63
overall charge-+2 for Cuprous and +3 for Cupric
Total particles in nucleus-63
number of protons -29
number of neutrons-34
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Why do you think the mass was lost when the reaction was done in the normal setup but stayed the same when the reaction was done in the gas collection setup?
The mass was lost when the reaction was done in the normal setup but stayed the same when the reaction was done in the gas collection setup because of the law of conservation of mass.
The law of conservation of mass states that -
Mass can neither be created nor destroyed or lost, in any reaction. It remains constant in a system.
So, the mass lost in surrounding was neither got considered nor got calculated when the reaction setup was done in normal way. But when the reaction was done in a closed setup where after the reaction, the gas was collected, the mass was changed. It proved the postulate stated by the law of conservation of mass and energy.
Therefore, it is explained by the law of conservation of mass.
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What is the function of mitochondria?
Answer:
It regulates metabolic activity of a cell
It promotes the growth of new cell and cell multiplication.
It produce energy
Answer:
As mitochondria is known as powerhouse of cell,its functions are:
It produces energy required for the cell.
It stores the energy.
It promotes cell growth and cell multiplication.
Q1. A student investigated the law of conservation of mass
The law of conservation of mass states that the mass of the products is equal to the
mass of the reactants.
This is the method used.
1. Pour lead nitrate solution into a beaker labelled A.
2. Pour potassium chromate solution into a beaker labelled B.
3. Measure the mass of both beakers and contents.
4. Pour the solution from beaker B into beaker A
5. Measure the mass of both beakers and contents again.
When lead nitrate solution and potassium chromate solution are mixed, a reaction takes
place.
This is the equation for the reaction:
Pb(NO₂)(aq) + K.CrO.(aq)
(a). -> PbCrO.(s) + 2KNO.(aq)
Beaker A and contents before mixing: 128.71g
Beaker B and contents before mixing: 128.97g
Beaker A and contents after mixing: 154.10g
Beaker B after mixing: 103.58g
Show that the law of conservation of mass is true.
Use the data from the table above.
The following question follows the law of conservation of mass.
The law of conservation of mass states that in a reaction the mass of the products is equal to the mass of the reactants.
The reaction is :
Pb(NO₃)₂(aq) + K₂CrO₄(aq) → PbCrO₄(s) + 2KNO₃(aq)
the mass of beaker A containing lead nitrate = 128.71g
the mass of beaker B containing potassium chromate = 128.97g
After mixing beaker A and B,
mass of beaker A = 154.10g
mass of beaker B = 103.58g
Thus, according to law of conservation of mass,
mass of reactants = 128.71 + 128.97 = 257.68g
mass of products = 154.10 + 103.58 = 257.68g
hence, mass of products = mass of reactants.
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The atomic orbital of the quantum mechanical model is very similar to the orbit described by the bohr model. True or false
The given statement is false.
In physics, a quantum (plural quanta) is the minimum amount of any bodily entity (physical property) concerned in an interaction. The vital thinking that a bodily property can be "quantized" is referred to as "the speculation of quantization".[1] This capability that the magnitude of the bodily property can take on only discrete values consisting of integer multiples of one quantum.
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What compound interest per period in percentage would result in the future amount being 1.6 times as large as the starting amount at the end of 10 periods?
The nominal interest rate is therefore 4.8122%.
This compound interest problem can be solved by using the formula
A = P(1+i^)n,
where i = r/n and
A represents the total amount of money accumulated during the nth conversion period.
The nominal interest rate is r.
P is the initial investment's primary amount.
t is the number of years,
n is the number of compounding periods per year.
Assuming P = $100 in this case,
the eventual amount A will be 1.6 * 100 = 160, t = 10 years, and n = 1.
The result of the formula above is Nominal interest rate (in decimal) is equal to n [(A/P)^1/nt - 1].
When we substitute,
we obtain the value r = 1*[(160/100)^1/10 -1].
r = (1.04812 -1)
r =0.048122 (in decimal)
r = 0.048122 *100
r= 4.8122%
The nominal interest rate is therefore 4.8122%.
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Change 1
Change 1 is:
impossible
a physical change
a chemical change
Sample of Substance X
Change 2
Change 2 is:
impossible
a physical change
a chemical change
Change 3
Change 3 is:
impossible
a physical change.
a chemical change
X
S
In the original sample of substance X, there are 12 molecules and each molecule is made of 2 small red spheres and one blue sphere in the middle.
Change 1:Change 1 has the same total number of red and blue spheres as the original sample, but the structure of molecules has changed. As a result, this is a chemical change.
Change 2:In Change 2, the structure of molecules is changed. Some molecules contain solely red spheres, whereas others include both red and blue spheres. Furthermore, the total number of molecules is greater than the number of molecules in the original sample. This violates the principle of conservation of mass. Hence, this is an impossible change since extra matter was created in this change.
Change 3:In Change 3, the number of the molecules and the structure of the molecules is same as the orignial sample. Hence, it is a physical change.
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Which pair of elements do you expect to be most similar?
a. mo and sn cl and f si and p k and sr n and ni
Among the pair of elements given, Cl and F are expected to be the most similar.
On the basis of periodic table,
Cl and F are in the same group which is the halogen group. Thus, they possess similar properties.Of the choices provided, Chlorine (Cl) and Fluorine (F) are the only pair located in the same group while the others belong to different groups in periodic table.
Nitrogen have symbol N and belongs to main group element while Nickel have symbol Ni and belong to transition element. Therefore, they are not similar.
Molybdenum have symbol Mo belongs to transition element and Tin have symbol Sn belongs to main group element possessing different properties.
Sodium have symbol Na and classified as alkali metal while Magnesium have symbol Mg, classified as alkaline earth metals. They do no have similar properties.
Silicon having symbol Si is a metalloid while Phosphorus having symbol P is a non-metal. Thus, they are not similar.
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Why has the number of frogs decreased from 2012 to 2013
Answer:
infectious diseases, chemical pollution and increased ultraviolet ( uv ) radiation
The density of a material is a/an ___________.
a) chemical property
b) extensive property eliminate
c) intensive property
d) reactive property
The density of a material is an intensive property.
What is intensive property?
An intensive property of matter is one that does not change with the amount of matter. It is a bulk property, which means that it is a physical property that is independent of sample size or mass. An extensive property, on the other hand, is one that is affected by sample size.
What factors influence an intensive property?Intensive properties are those that are determined solely by the characteristics of the material and not by its quantity - for example, density, temperature, refractive index, color, and pressure. Intensive properties are not additive, which means their value does not change when the amount of material is changed.
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One serving of peanuts has about 166.000 calories. Convert this to Joules.
[answer: 695,000 J]
please show me the work! thank youu!
One serving of peanuts has about 166.000 calorie then in joules are 695,000 Joule means 694.544 Joule and 'joule is the amount of energy exerted when a force of one newton is applied over a displacement of one meter'
A calorie is a unit of energy in nutrition, calories refer to the energy people get from the food and drink they consume, and the energy they use in physical activity and calories are listed in the nutritional information on all food packaging many weight loss programs center around reducing the intake of calories.
Here given data is peanuts = 166.000 calories given in the calories then we have to find in joules = ?
In the thermochemical calories to joule we have one given value i.e
1cal th = 4.184 J means here 1 cal = 4.184 J
So, we have to calculate 166.000 calories
Then, 4.184×166.000
= 694.544 J
Which is approximately 695,000 J
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