Carbon skeletons may vary in shape, length, number, location and strenght of covalent bonds between carbon atoms.
Element carbon is in group 14 of Periodic table of elements.
Electron configuration for carbon: ₆C 1s² 2s² 2p².
Valence electrons are in 2s and 2p orbitals. There is one pair of electrons in 2s orbital and two lone electrons in 2p orbital with the same electron spin.
A carbon atom has four covalent bonds with other carbon atoms in an organic compound.
Carbon also has different type of hybridization (sp, sp2 and sp3).
The strenght of carbon-carbon bond is approximately 350 kJ/mol.
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Of the following compounds, which is the most ionic?
(a) sicl4
(b) brcl
(c) pcl3
(d) cl2o
(e) cacl2
cacl2 is the most ionic.
Ionic bonding is the perfect transfer of valence electrons between atoms. This is a type of chemical bond that creates two oppositely charged ions of her. In ionic bonding, metals lose electrons and become positively charged cations, while nonmetals gain their electrons and become negatively charged anions.
An ionic bond also called an electrical bond, is a type of bond created by electrostatic attraction between oppositely charged ions in a compound. Such bonds are formed when the valence (outermost) electron of one atom permanently moves to another atom.
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Help I need help on this !! Please
Fast!!
Step 1 convert gal to L step 2 convert L to cl
Here given data is water are held in tanker truck volume = 5,500 gallon
So here 1st we have to convert
5,500 gallon = 20,819 Litre
So in 1st step we have to converted gallons into litre
Then 1 litre = 100 centilitre so,
20,819 Litre = 208.19 centilitre
So, in the 2nd step we have to converted litre to centilitre
5,500 gallon = 20,819 Litre and 20,819 Litre = 208.19 centilitre
This is how the conversion from beginning to ending
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If the density of a metal sample is 1.56 g/l and the volume of the sample is 250ml, calculate the mass of the metal sample.
The metal sample with a density of 1.56 g/l and a volume of 250ml, has a mass of: 0.39 g
The density formula and the procedure we will use is:
ρ = m/v
Where:
v= volumeρ= densitym= massInformation about the problem:
ρ= 1.56 g/lv= 250mlm= ?By converting the volume units from (ml) to (l) we have:
v= 250ml * 1 l /1000 ml
v = 0.25 l
Applying the density formula and clearing the mass (m), we get:
m = ρ * v
m = 1.56 g/l * 0.25 l
m = 0.39 g
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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Considere the rate law rate = k[co2][n2]^n what is the order with respect to co2?
The order with respect to CO2 is 1 i.e it is first order with respect to CO2.
The rate of any chemical reaction can be determined by chemical kinetics, which is a branch of chemistry dealing with the study of reaction rates and their mechanisms.
According to chemical kinetics, the rate of a reaction depends upon its reactants which is given by the rate law expression,
Let us take a hypothetical example to understand the rate law expression
aA+ bB ⇒ cC
In the above reaction, we can write the rate law expression as,
Rate =k [A]^x[B]^y, where x and y are the orders of the reactants, a and b respectively and k is a constant.
Similarly, in the expression Rate = k [co2][n2]^n, the order of CO2 is 1 and the order of N2 is n.
Hence, the order with respect to CO2 is 1 i.e it is the first order with respect to CO2.
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What is the percent yield of koh when 22.4 grams of ko2 reacts with an excess of water to produce 13.9 grams of koh?
The percent yield of KOH is 78.7%.
Balanced chemical reaction:
4KO₂ + 2H₂O → 4KOH +3O₂
m(KO₂) = 22.4 g; mass of the oxide
m1(KOH) = 13.9 g; mass of the potassium hydroxide produced
n(KO₂) = 22.4 g ÷ 71.1 g/mol
n(KO₂) = 0.315 mol; amount of the oxide
From chemical reaction: n(KO₂) : n(KOH) = 1 : 1
n(KOH) = 0.315 mol; amount of the potassium hydroxide
m(KOH) = 0.315 mol x 56.1 g/mol
m(KOH) = 17.67 g; a theoretical yield of KOH
the percent yield = 13.9 g / 17.67 g x 100%
the percent yield = 78.7%
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1. Eight atoms of carbon react with 18 atoms of hydrogen, forming only one molecule of CsHis. Is the
forming of only one molecule considered a violation of the law of conservation of mass? Explain.
Eight atoms of carbon react with 18 atoms of hydrogen , forming only one molecule of [tex]C_{8} H_{18[/tex] is considered as violation of the law of conservation of mass .
According to the law of mass conservation , neither chemical processes nor physical changes can create or destroy mass in an isolated system . The mass of the products and reactants of a chemical reaction must be equal, in accordance with the law of conservation of mass .
The reaction occur when eight atoms of carbon react with 18 atoms of hydrogen , forming only one molecule of [tex]C_{8} H_{18[/tex] is given as .
8C +18[tex]H_{2}[/tex] → [tex]C_{8} H_{18[/tex]
Mass of reactants = 8 × 12 + 18 × 2 = 132 g
Mass of reactants = 8 × 12 + 18 = 114 g
So , mass of reactant is not equal to the mass of product .
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A glass of orange juice contains 3.1 dl of juice. how many milliliters of orange juice are in the glass?
Answer:
310
Explanation:
Determine the empirical formula of a compound that is 68. 42% cr and 31. 58% o by mass.
Cr2O3 is the empirical formula of a compound that is 68.42% Cr and 31.58% O by mass.
The masses in grams are pretend percentages: 68.4 g Cr 31.6 g ODivide both by the periodic table mass to get the moles: 68.4gCr/51.996=1.316 mol Cr 31.6gO/16.00=1.975 mol OThe lesser quantity (1.316 is less than 1.975) should be used to divide the two mole values: Cr 1.316/1.316=1 O 1.975/1.316=1.5Since 1.5 is not a whole number, and multiplying 0.5 by 2 gets rid of the decimal, multiply both values by 21 Cr (2)=21.5 O (2)=3The subscripts are Cr2O3.
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Gold has a density of 0.01932 kg/cm3. what volume (in cm3) would be occupied by a 22.2 g sample of gold?
The volume occupied by a 22.2 g sample of gold having a density of 0.01932 kg/cm3.
As we know that the density of a given substance is :
Density = mass/volume
Now to find the volume, reshuffle the formula:
volume = mass/ density
Now,
density = 0.01932 kg/cm3
mass = 22.2g = 0.0222 kg
Putting the values,
volume = 0.01932/0.0222
volume = 1.49 cm3
The volume is 1.49 cm3.
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A solution of h2so4(aq) with a molal concentration of 6.80 has a density of 1.318 g/ml. what is the molar concentration of this solution?
The molal concentration of the solution is 5.38 M.
The molal concentration of sulphuric acid = 6.80 m
The density of the solution = 1.318 g/ml
Mass of the sulphuric acid in the solution is,
[tex] = 6.80 \times 9.80[/tex]
[tex] =666.4 \: g[/tex]
The mass of sulphuric acid present in the solution is 666.4 g.
Let the mass of the solvent in which sulphuric acid is dissolved be 1000 grams.
So the total mass of the solution is,
= Mass of solvent + Mass of sulphuric acid
[tex] = 666.4 \: + \: 1000[/tex]
[tex] = 1666.4 \: g[/tex]
The total volume of the solution is,
[tex] = \frac{1666.4 \times 1}{1.318 \times 1000} [/tex]
[tex] = 1.264 \: L[/tex]
The volume of the solution is 1.264 liters.
The molal concentration of this solution is,
[tex] = \frac{6.80}{1.264} [/tex]
[tex] = 5.38 \: M[/tex]
Therefore, the molal concentration of the solution is 5.38 M.
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When the difference between a measured value and the known value is expressed as percentage error, it is usually written as
When the difference between a measured value and the known value is expressed as a percentage error, it is usually written as either negative or positive.
How do introduce differences in measured values?The accepted terminology to introduce differences in measured values during experimentation and data collection is to introduce this difference with the sing based on the first data (either positive or negative).
In conclusion, when the difference between a measured value and the known value is expressed as a percentage error, it is usually written as either negative or positive.
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3. Which of the following is not an example of acceleration?
a. A car coming to a stop at a stoplight.
b. An avalanche increasing speed down the side of a mountain.
c. A cheetah running at a constant speed on a hunt.
d. A jet making a sharp turn in an air show.
Answer:
C: The Cheetah running at a constant speed.
Explanation:
Acceleration can be defined as:
1: A decrease in speed
2: An increase in speed
3: A change in direction.
The cheetah is the only object that does not meet any criteria for acceleration.
The example that is not an example of acceleration is a cheetah running at a constant speed on a hunt. The correct option is option (c).
Acceleration refers to a change in velocity, either in magnitude or direction. In the case of the cheetah running at a constant speed, there is no change in velocity, so there is no acceleration.
The cheetah maintains a steady speed, there is no change in velocity hence, it is not accelerating.
Therefore, a cheetah runs at a constant speed on a hunt. The correct option is option (c).
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Why was it important not to over-heat the beaker when drying the sodium chloride?
It important not to over-heat the beaker when drying the sodium chloride so that parts won't be lost, and in addition, if the beaker were to overheat, it would crack.
Can you evaporate sodium chloride?
At gas pressures ranging from 0.74 to 212 psia, the rate of evaporation of molten NaCl in the presence of different gases was observed. The rate in crucibles heated by induction had a distinct slope at high and low pressures and was a linear function of (1/P).It is demonstrated that the (1/P) dependency is predicted for turbulent free convective mass transfer. Under some circumstances, when pressure dropped, the rate of evaporation also did. This result is explained by the condensation of NaCl in the gas and the subsequent reflux of NaCl particles into the melt. The significant disparity in evaporation rates between Ar, He, and CO2 is related to the CO2's infrared absorption as well as variations in thermal conductivity.
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What is responsible for the differences in chemical shift observed in carbon 4 in 4-fluoroheptane and carbon 4 in heptane?
The chemical shift of a given proton is decided specifically with the aid of interactions with the nearby electrons. The most necessary thing to recognize is that when electrons are subjected to an external magnetic field, they structure their own small prompted magnetic fields in opposition to the exterior field.
Consider the methane molecule ( CH4 ) in which the four equal protons have a chemical shift of 0.23 ppm (this is a price we can look up in any chemistry reference source). The valence electrons around the methyl carbon, when subjected to B0, generate their own very small triggered magnetic area that opposes B0 . This induced field, to a small however full-size degree, shields the close by protons from experiencing the full force of B0 , an impact regarded as local diamagnetic shielding. In different words, the methane protons do now not quite journey the full force of B0 - what they journey is known as Beff , or the high-quality field, which is slightly weaker than B0 due to the have an effect on of the close by electrons.
In nuclear magnetic resonance (NMR) spectroscopy, the chemical shift is the resonant frequency of an atomic nucleus relative to a preferred in a magnetic field. Often the position and range of chemical shifts are diagnostic of the shape of a molecule.
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Which food contains at least 100 mcg of folate per serving? one, some, or all responses may be correct.
One-half cup of black-eyed peas contains at least 100 mcg of folate per serving.
In infants and the women with poor folic acid intakes, the neural tube defects (NTDs), or failures in the closure of the neural tube are more common. For the normal formation of the spinal cord, proper closure of the neural tube is required.
Within the first month of gestation, the neural tube begins to close, often before a person realizes that she is pregnant.
Therefore, 0.4 mg of folic acid should be taken every day, while consuming dietary sources of folate, i.e. intake of folate rich diet/meal by all people who are capable of becoming pregnant.
One-half cup of black-eyed peas contains at least 100 mcg of folate. Ready-to-eat breakfast cereal contains 200 mcg of folate and a slice of bread contains 20 mcg, and not 100 mcg of folate. One-half cup of broccoli and a cup of pasta contain 50 mcg, not 100 mcg of folate.
Complete question is-
Which food contains at least 100 mcg of folate per serving? one, some, or all responses may be correct.
1. Bread
2. Broccoli
3. Cooked pasta
4. Black-eyed pasta
5. Ready-to-eat breakfast cereal
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How many moles of oxygen atoms are in 4.14 moles of magnesium phosphate: mg3(po4)2 (mw. 262.87 g/mol)?
33.12 moles of oxygen atoms are present in 4.14 moles of magnesium phosphate, Mg₃(PO₄)₂.
Molecular weight of magnesium phosphate = 262.87 g/mol
Number of moles of magnesium phosphate = 4.14 moles
Since,
1 mole of magnesium phosphate contains 8 moles of oxygen atom
therefore,
4.14 moles of magnesium phosphate will contain 4.14 × 8 oxygen atoms.
1
Hence, 33.12 oxygen atoms are present.
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Name the spectral line in the spectrum of h-atom obtained when an electron jumps from n = 4 to n = 3.
The spectral line has been defined as the more or less number of photons in the spectrum that appears bright or dark. The electron jumping from n = 4 to 3 belongs to the Paschen series.
What is the Paschen series?The Paschen series is the Infrared (I.R) region that has a number of lines estimating from higher energy levels to n = 3 energy levels. If the electron jumps from n = 4 to n = 3 then they have wavelengths of 1875 nm.
This wavelength has been found to lie in the IR region that emits electrons from the atom of hydrogen. The electron tends to move from higher energy states to lower energy states.
Therefore, the electron transition belongs to the Paschen series.
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is gas occupies 733 cm at 10.9 at what temp will it occupy 950 cm
Temperature of gas at volume of 950 cm³ is 368.14K or 94.99⁰c.
Volume is the amount of space a three-dimensional object takes up, expressed in cubic units.units of volume are mL, liter, cm³ or m³.Given,
in this question, volume occupied by gas at 10.9⁰c is 733cm³.
we have to find out temperature at which gas occupies volume of 950 cm³.
First, convert temperature from celcius to Kelvin
10.9⁰c = 10.9 + 273.15 = 284.05 K
By equation or Boyle's Law
P1 x V1 / T1 = P2 x V2 / T2
Pressure is constant here
therefore, V1 / T1 = V2 / T2
here, V1 = 733 cm³
T1 = 284.05 K
V2 = 950 cm³
we have to find out T2
So, 733 / 284.05 = 950 / T2
T2 = 284.05 × 950 / 733 = 368.14 K
= 94. 99⁰c
Therefore the temperature of gas at volume of 950 cm³ is 368.14K or 94.99⁰c.
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Wherever it is found, water always contains oxygen and hydrogen in the mass ratio of 8 to 1. Taken by itself, this fact demonstrates what natural law?.
Natural law demonstrates constant composition wherever it is found, water always contains oxygen and hydrogen in the mass ratio of 8 to 1.
The above statement agreed by Law of constant proportions according to this law, a chemical compound always contains the same proportion of elements by mass. thus, irrespective of the source, or chemical compound always contains the element in a fixed ratio by mass for example, pure water obtained from river, sea, well always contains hydrogen and oxygen combined together in the ratio of 1:8 by mass that's why wherever it is found, water always contains oxygen and hydrogen in the mass ratio of 8 to 1. Taken by itself, this fact demonstrates constant proportions law demonstrates as natural law
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someone please help me i wasn’t here in class when this was taught
Answer:
text me i can teach you on inbox
A certain sample of liquid has a mass of 42 grams and a volume of 35 centimeters. What is the density of the liquid?
A certain sample of liquid has a mass of 42 grams and a volume of 35 centimeters. The density of the liquid is 1.2 g.cm⁻³
How can I determine a liquid's density?You follow the same procedures you would for a solid to determine the density of a liquid. Divide the mass of the fluid by its volume after computing its volume and weight. Weigh the substance inside the container, then pour it out and weigh the resulting empty vessel. The weight of the empty container is subtracted from the weight of the filled container to determine the fluid's mass.
Calculation of the above problemMass = 42gms
Volume = 35 cm³
Formula Used:
Density = Mass ÷ Volume
Putting values,
Density = 42 g ÷ 35 cm³
Density = 1.2 g.cm⁻³
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Landfills produce methane, which is a greenhouse gas and contributes to global warming. please select the best answer from the choices provided t f
It is true that methane, which is a greenhouse gas and contributes to global warming.
A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range.
Global warming is rise in the average temperature of the Earth's climate system.
Most often greenhouse gases are carbon dioxide (CO₂) and methane (molecular formula CH₄). These gases come from burning multiple substances: coal, petroleum, plastic and natural gas.
Balanced chemical reaction of combustion of methane:
CH₄ + 2O₂ → CO₂ + 2H₂O
Greenhouse gases are so difficult to measure, because carbone dioxide, methane, chlorofluorocarbons comes from multiple sources, some of which are relatively hard to measure.
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Answer:
It's true
Explanation:
Took the test
The type of synapse that occurs between the terminal end of the presynaptic cell and the dendrites of the postsynaptic cell is referred to as which kind of synapse?
Axodendritic type of synapse that occurs between the terminal end of the presynaptic cell and the dendrites of the postsynaptic cell is referred to as which kind of synapse
Synapses are part of the circuits that connect the sensory organs of the peripheral nervous system to the brain. B. People who perceive pain and touch. Synapses connect neurons in the brain to neurons in the rest of the body, and from those neurons to muscles.
A synapse is a small gap between two neurons where nerve impulses are carried by neurotransmitters from the axon of a presynaptic (transmitting) neuron to the dendrites of a postsynaptic (receiving) neuron. It is called the synaptic cleft or synaptic cleft.
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constant temperature and the pressure upon it. Write down the relationship in terms of a (a) Proportion (b) equation (c) formula
Answer:
Proportion : The Equality of two ratios
Equation: Values of two mathematical expressions are equal.
Formula: Mathematical relationship or rule expressed in symbols.
Explanation:
Because ___ occurs without oxygen scientist believe this stage in cellular respiration evolved first
Because glycolysis occurs without oxygen scientists believe this stage in cellular respiration evolved first.
Glycolysis, which does now no longer require oxygen and is stated to have developed earlier than the opposite energy-generating tiers of cell breathing at a time while there has been no oxygen withinside the Earth's environment The first step is breathing, which is anaerobic and does now no longer require oxygen.
Glycolysis happens withinside the cytosol of the cellular and does now no longer require oxygen, while the Krebs cycle and electron shipping arise in mitochondria and require oxygen.
The first step in cell breathing, glycolysis, happens withinside the cytoplasm of the cellular. A glucose molecule is damaged down into molecules of pyruvate (pyruvate).
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How much energy would be released as an electron moved from the n=4 to the n=3 energy level?
The energy released when electron move from n=4 to n=3 is 0.66 eV
We know that in an atom energy of nth state is
[tex]E_n = -13.6/n^{2}[/tex] eV
where n is the energy level
Therefore,
[tex]E_4 = -13.6/4^{2} \\E_3 = -13.6/3^{2}[/tex]
Thus, [tex]E_4[/tex] = -0.85eV
[tex]E_3[/tex] = -1.51eV
Therefore, total mount of energy released in moving electron from n=4 to n=3 is given by -
[tex]E_4 -E_3[/tex]
= -0.85 - ( -1.51)
= 0.66eV
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Complete each row of the table below by filling in the missing prefix or missing exponent.
The metric prefixes are a follows;
1 ng = 10^-9 g1 dg = 10^-10 g1μg = 10^-6 g1Mg = 10^6 gWhat are metric prefixes?The SI unit is the international system for the measurement of quantities. We know that the SI system is based on the metric system. The metric system has the units meter, gram and seconds as part of it.
Sometimes we use prefixes to show the magnitude of quantities when we are using the metric system. Let us now try to find the correct prefix or power in the following cases;
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Substance P is soluble in water but insoluble in propanone.
Substance Q is insoluble in water but soluble in propanone.
Substance R is insoluble in both water and propanone.
Describe how to obtain a pure dry sample of each of P, Q, and R from a mixture of P+Q+R.
What would happen to the ph of the cells of a group of people having a contest as to which one can stop breathing for the longest time?
If one can stop breathing for the longest time builds up in their systems pH of the cells causing the pH of their own blood to drop slightly 'pH level increases'
pH means quantitative measure of the acidity or basicity of aqueous or other liquid solutions
For most people its safe to hold your breath for a minute or two but so much longer can decreases oxygen flow to the brain can causing damage your brain as well as in heart a lack of oxygen can cause abnormalities or rhythm and can affect the pumping action of heart and when the brain senses the change in pH due to increased carbon dioxide it increases our respiratory system to get more oxygen and blow out more carbon dioxide in an taking the normal balance between oxygen and carbon dioxide that's why pH level increases
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Suppose you stir a little baking soda into water until the water looks clear again. how could you prove to someone that the clear material is a mixture and not a compound?
To prove to someone that the clear material is a mixture and not a compound, you could put the solution in a cup and then let the water evaporate. The baking soda will stay in the cup.
What is baking soda?Baking soda is a NaHCO₃. Its chemical name of sodium bicarbonate. It is a salt of carbonates. It is used in making dishes. This is used to make cakes or other fermented foods.
Thus, you may put the solution in a cup and then let the water evaporate to demonstrate to someone that the clear substance is a mixture rather than a compound. The cup will hold the baking soda.
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