Question 1

Which of the following is a chemical property of sodium metal?

Accepted Answer

It reacts vigorously with water to produce hydrogen gas.

Question 2

A student finds that 12.4 g of a metal occupies 25.0 cm$$^3. $$What is the density of the metal? (Show answer to correct significant figures.)

Accepted Answer

$$0.496\ \mathrm{g/cm^3$}$$

Question 3

Which of the following statements about Rutherford’s gold foil experiment is correct?

Accepted Answer

It showed that atoms are mostly empty space with a small, dense nucleus.

Question 4

Which of the following is the correct formula for magnesium phosphate?

Accepted Answer

$$\mathrm{Mg_3$(PO_4$)_2}$$

Question 5

What is the empirical formula of a compound that contains 43.6% K, 56.4% S by mass?

Accepted Answer

$$\mathrm{K_2S}$$

Question 6

Which of the following is a correct balanced equation for the decomposition of sodium azide, used in automobile airbags?

Accepted Answer

$$2\mathrm{$$NaN_3$$} \rightarrow 2\mathrm{Na} + 3\mathrm{N_2$}$$

Question 7

A sample contains 0.7500 kg of water. How many moles of water are present? ($$M_{\mathrm{H_2O}} = 18.02\ \mathrm{g/mol})$$

Accepted Answer

$$41.62$$

Question 8

Which of the following is the correct name for $$\mathrm{H_2CO_3}$$?

Accepted Answer

Carbonic acid

Question 9

Which of the following elements is a halogen?

Accepted Answer

Chlorine

Question 10

What is the percent yield if 5.2 g of $$\mathrm{MgO} is $$produced from a reaction with a theoretical yield of 14.9 g?

Accepted Answer

$$34.9\%$$

Question 11

Which of the following is the correct formula for chromium(III) chloride?

Accepted Answer

$$\mathrm{$$CrCl_3$$}$$

Question 12

How many significant figures are in the measurement 0.0170 mL?

Accepted Answer

3

Question 13

Which of the following is a physical change?

Accepted Answer

Boiling water

Question 14

Which of the following is the correct name for $$\mathrm{N_2O_3}$$?

Accepted Answer

Dinitrogen trioxide

Question 15

Which of the following is the correct formula for aluminum nitrate?

Accepted Answer

$$\mathrm{Al(NO_3$)_3}$$

Question 16

Which temperature scale has no negative values?

Accepted Answer

Kelvin

Question 17

Which of the following is the correct balanced equation for the reaction of aluminum with oxygen to form aluminum oxide?

Accepted Answer

$$4\mathrm{Al} + 3\mathrm{O_2$} \rightarrow 2\mathrm{Al_2O_3}$$

Question 18

A compound has an empirical formula of $$\mathrm{NH_2SO_4}$$ and a molar mass of 132 g/mol. What is its molecular formula?

Accepted Answer

$$\mathrm{(NH_2SO_4)_2}$$

Question 19

Which of the following is the correct formula for calcium phosphate?

Accepted Answer

$$\mathrm{Ca_3$(PO_4$)_2}$$

Question 20

Which of the following is the correct name for $$\mathrm{Pb(C_2H_3O_2)_2}$$?

Accepted Answer

Lead(II) acetate

General Chemistry Exam Study Guidance (Chapters 1–3)

Guida di studio - Domande di pratica