Question 1

Which statement best describes the law of constant composition?

Accepted Answer

All samples of a given compound have the same proportions of their constituent elements.

Question 2

A sample of iron chloride contains 35.55 grams of iron and 106.5 grams of chlorine. What is the most likely empirical formula for this compound?

Accepted Answer

$\mathrm{FeCl_3}$

Question 3

Which of the following elements has an atomic number of 47?

Accepted Answer

Ag

Question 4

What is the correct chemical symbol for mercury?

Accepted Answer

Hg

Question 5

When an atom loses an electron, the resulting particle is called:

Accepted Answer

a cation

Question 6

A fictional element has two naturally occurring isotopes with the following abundances: 16 (50.0%) and 18 (50.0%). Which statement is TRUE for this element?

Accepted Answer

The atomic mass would be 17.

Question 7

What is the formula mass of copper(II) fluoride?

Accepted Answer

$101.53\ \mathrm{amu}$

Question 8

Which of the following compounds has the smallest formula mass?

Accepted Answer

$\mathrm{H_2O}$

Question 9

A 4.77 gram sample of potassium nitrate contains how many grams of potassium?

Accepted Answer

0.94

Question 10

A 500 gram iron ore sample was determined to contain 242 grams of iron. What is the mass percent of iron in the ore?

Accepted Answer

$48.4\%$

Question 11

Determine the correct empirical formula of a compound containing 26.68% carbon, 2.24% hydrogen, and 71.08% oxygen.

Accepted Answer

$\mathrm{C_2H_2O_3}$

Question 12

What is the mass of $3.91 	imes 10^{24}$ sulfur atoms?

Accepted Answer

208 g

Question 13

What is the correct name for the $\mathrm{BrO_3^-}$ ion?

Accepted Answer

bromate

Question 14

Which statement about the discovery of electrons is FALSE?

Accepted Answer

Rutherford proposed the plum-pudding model.

Question 15

What is the name of $\mathrm{CaCO_3}\cdot\mathrm{H_2O}$?

Accepted Answer

calcium carbonate monohydrate

Question 16

How would the formula of dinitrogen pentasulfide be written?

Accepted Answer

$\mathrm{N_2S_5}$

Question 17

What is the formula mass for dichrom tetrachloride?

Accepted Answer

$237.84\ \mathrm{amu}$

Question 18

Nonmetals are located where on the periodic table?

Accepted Answer

right side

Question 19

What is the mass percent of carbon in oxalic acid, $\mathrm{H_2C_2O_4}$?

Accepted Answer

$26.7\%$

Question 20

Which statement below accurately describes the contributions of Dalton?

Accepted Answer

Formulated the modern atomic theory.

Atoms, Elements, and Chemical Composition: Pre-Test 2 Study Notes

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