When might a large volume of material have little mass

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Answer 1

Answer: A large volume of material will have a small amount of mass when thematerial in question is gaseous or porous, and therefore has a lot ofspace within it despite taking up a large amount of space overall.

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What physical property of an element determines whether it acquires a positive or negative partial charge when participating in a polar covalent bond?

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What information is necessary to determine the atomic mass of the element chlorine?(1) the atomic mass of each artificially produced isotope of chlorine, only
(2) the relative abundance of each naturally occurring isotope of chlorine, only
(3) the atomic mass and the relative abundance of each naturally occurring isotope of chlorine
(4) the atomic mass and the relative abundance of each naturally occurring and artificially produced isotope of chlorine

Answers

Answer is: (3) the atomic mass and the relative abundance of each naturally occurring isotope of chlorine.

m(³⁵Cl) = 34.97 amu; the average atomic mass of chlorine-35.

m(³⁷Cl) = 36.97 amu; the average atomic massof chlorine-37.

ω(³⁵Cl) = 75.76% ÷ 100% = 0.7576; fractional abudance of chlorine-35.

ω(³⁷Cl) = 24.24% ÷ 100% = 0.2424; fractional abudance of chlorine-37.

m(Cl) = m(³⁵Cl) · ω(³⁵Cl) + m(³⁷Cl) · ω(³⁷Cl).

m(Cl) = 34.97 amu · 0.7576 + 36.97 amu · 0.2424.

m(Cl) = 35.4548 amu; average atomic mass of chlorine.

Final answer:

The atomic mass of chlorine is determined by both the atomic mass and the relative abundance of each naturally occurring isotope of chlorine. It's based on an average of the masses of the isotopes according to their relative abundance.

Explanation:

To determine the atomic mass of the element chlorine, option (3), both the atomic mass and the relative abundance of each naturally occurring isotope of chlorine is required. The atomic mass of chlorine is not just the mass of one particular atom, or isotope; instead, it's an average of the masses for all the isotopes according to their relative abundance. For instance, Chlorine has two isotopes Chlorine-35 and Chlorine-37. If the relative abundance of Chlorine-35 is 75% and that of Chlorine-37 is 25%, the atomic mass is calculated by the formula [(0.75 x 35) + (0.25 x 37)].

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In a hydrocarbon-based combustion reaction, what two molecules are most likely to be products?

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The two molecules that are always produced in combustion reactions are water (H₂O) and carbon dioxide (CO₂).

I hope this helps. Let me know if anything is unclear.

if burning wood causes the energy of the surroundings to increase by 12,000J what is the change in energy of the wood

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Due to the law of conservation of energy we know that the energy that heated the surrounding had to have come from the reaction which means that the wood (with oxygen since this is combustion) lost 12000J. The change in energy for the wood is negative. I hope this helps. Let me know if anything is unclear.

Which is the formula for the functional group in an amine?

Answers

An 'amine' is an organic compound primarily composed of carbon(C), hydrogen(H) and nitrogen (N).

Ammonia is a molecule in which the N atom is attached to 3 H atoms, in addition there is a lone pair of electrons on the central N atom. Amines are essentially derivatives of ammonia where one of more H atoms have been replaced by an alkyl (R) or aryl(Ar) group

For example:

R-NH2 == primary amine

R2-NH == secondary amine

R3N == tertiary amine

The amine functional group is R-NH2, 2 or 3 hydrogen atoms have been replaced by organic groups R, forming primary amine, secondary amine and tertiary amine.

hope this helps!

Calculate the molar mass of cacl2

Answers

Answer:

$\boxed {\boxed {\sf 110.98 \ g/mol}}$

Explanation:

The molar mass is the mass of a substance in grams per mole.

To find it, add the mass of each element in the compound. These masses can be found on the Periodic Table.

The compound given is:

$CaCl_2$

The compound has 1 Ca (calcium) and 2 Cl (chlorine).

Mass of Calcium

The molar mass of calcium is 40.08 g/mol
There is only one atom of Calcium in CaCl₂, so the number above is what we will use.

Mass of Chlorine

The molar mass of chlorine is 35.45 g/mol
There are two atoms of chlorine in CaCl₂, therefore we need to multiply the molar mass by 2.
35.45 * 2= 70.9 g/mol

Molar Mass of CaCl₂

Now, to find the molar mass, add the molar mass of 1 calcium and 2 chlorine.
40.08 g/mol + 70.9 g/mol =110.98 g/mol

The molar mass of CaCl₂ is 110.98 grams per mole.

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