Question 1

Which of the following best illustrates the law of constant composition?

Accepted Answer

A sample of water always contains 11% hydrogen and 89% oxygen by mass.

Question 2

Which state(s) of matter are significantly compressible?

Accepted Answer

Gases only

Question 3

Which of the following is NOT an example of a chemical reaction?

Accepted Answer

The condensation of water vapor

Question 4

Which of the following is the most accurate definition of accuracy in measurements?

Accepted Answer

How close a measured number is to the actual value

Question 5

Which of the following items would be considered the most dense?

Accepted Answer

A block of metal with a volume of $$2.5\, \mathrm{mL}$$ and a mass of $$52.5\, \mathrm{g}$$

Question 6

Which of the following is NOT part of Dalton's atomic theory?

Accepted Answer

Atoms can be converted into other elements by chemical reactions.

Question 7

Which of the following species contains 18 electrons?

Accepted Answer

$$\mathrm{Ar}$$

Question 8

What is the correct name for $$\mathrm{$$MgF_2$$}$$?

Accepted Answer

Magnesium fluoride

Question 9

Which of the following is a combustion reaction?

Accepted Answer

$$\mathrm{CH_4$ + 2O_2 \rightarrow CO_2$ + 2H_2O}$$

Question 10

A sample of $$\mathrm{CH_4$}$$ with a mass of $$19\, \mathrm{g}$$ contains how many moles?

Accepted Answer

$$1.19$$

Question 11

Which element below is the most metallic?

Accepted Answer

Sodium

Question 12

Which of the following has the greatest effective nuclear charge as experienced by an electron in a $$2p$$ subshell?

Accepted Answer

O

Question 13

Which of the following has the most negative electron affinity?

Accepted Answer

Chlorine

Question 14

Which of the following best describes lattice energy?

Accepted Answer

The energy required to convert a mole of ionic solid into its constituent ions in the gas phase

Question 15

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$

Question 16

Which of the following is the correct electron configuration for the atom with the highest second ionization energy?

Accepted Answer

$$1s^2$$

Question 17

Which of the following is the correct order for increasing atomic radius?

Accepted Answer

F \u003c O \u003c N \u003c C

Question 18

Which of the following is the correct name for $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron (III) chloride

Question 19

Which of the following is a physical change?

Accepted Answer

Melting of ice

Question 20

Which of the following is the empirical formula for glucose ($$\mathrm{C_6H_{12}O_6$}$$)?

Accepted Answer

$$\mathrm{CH_2O}$$

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