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3 years ago

Which properties determines the element that an atom Is?

Chemistry

1 answer:

balandron [24]3 years ago

4 0

Answer:

The answer would be C. Number of protons in the atom.

Explanation:

On the periodic table, you see the element, with a big number at top, and a small number below the element name/abbreviation.

The big number is the amount of protons of the atom, which define each atom. The smaller number represents the atomic mass of the atom.

#teamtrees #WAP (Water And Plant)

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In order to produce CO2, a student put a sample of calcium carbonate in a flask and added hydrochloric acid using the following

Lady_Fox [76]

Answer:

82.9% Is the percent yield

Explanation:

First, we need to balance the equation.

Ca(CO3) + 2HCl → H2O + CO2 + CaCl2

Since the problem tells you that the excess reactant is Ca(CO3), we just need to Stoichiometry to solve for the theoretical yield.

$\frac{200g HCl}{1}$ x $\frac{1 mole HCl}{36.46gHCl}$ x $\frac{1 mol CO2}{2molHCl}$ x $\frac{44.01CO2}{1molCO2}$ =120.707 g (theoretical yield)

Take your actual yield of 100g, divide that by 120.707, then multiply that decimical by 100.

4 0

3 years ago

If a gas is 0.8L at 900 mm Hg and 400K, what is the new pressure if the volume decreases to 0.5L and 300K?

mezya [45]

Answer:

The new pressure of the gas is 1080 mmHg

Explanation:

The general equation provides a way to calculate the relationship between changesnp in volume, temperature and pressure of a given mass of gas.

The general gas equation is given as P1V1/T1 = P2V2/T2

Where P1 is initial pressure of gas

V1 is initial volume of gas

T1 is initial temperature of gas

P2 is final pressure of gas

V2 is final volume of gas

T2 is final temperature of gas

From the given question, P1 = 900 mmHg, V1 = 0.8 L, T1 = 400 K, P2 = ?, V2 = 0.5 L, T2 = 300 K

Making P2 subject of the general gas equations:

P2 = P1V1T2/V2T1

P2 = (900 × 0.8 × 300) / (0.5 × 400)

P2 = 1080 mmHg

Therefore, the new pressure of the gas is 1080 mmHg.

5 0

3 years ago

Can anyone do this. i dont get it

Flauer [41]

13. Nt
14. St
15. St
16. At
17. Nt

3 0

3 years ago

An electron has _____.

irina [24]

Answer:

An electron has more mass than a proton or a neutron.

Explanation:

Mass of electron - 9.109 e-31 kg

hope it helps!!

7 0

3 years ago

Which statement best describes the amount of catalyst that remains at the end of a reaction?

Ivenika [448]

I believe the correct answer is C. The amount of catalyst is the same at the end as at the beginning of the reaction. Catalysts can't be consumed by the reaction thus is not D.

7 0

3 years ago

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