Question 1

When the equation $$\mathrm{$$AlCl_3$$(aq) + Ba_3$(PO_4$)_2(aq) \rightarrow $$AlPO_4$$(s) + $$BaCl_2$$(aq)} is $$properly balanced, what is the coefficient of barium chloride ($$\mathrm{$$BaCl_2$$}$$)?

Accepted Answer

3

Question 2

A certain element has four naturally occurring isotopes with the following data:

Mass (amu): 49.946 (4.35%), 51.941 (83.79%), 52.941 (9.50%), 53.939 (2.36%).

Calculate the average atomic mass of the element.

Accepted Answer

$$51.32$$

Question 3

Which of the following matched pairs of name and formula has an error?

Accepted Answer

Tetraantimony hexoxide, Sb_4O_6

Question 4

Which of the following does NOT exist as a diatomic molecule at room temperature?

Accepted Answer

Argon

Question 5

Express $$39.34\ \mathrm{yd^2$} in$$ $$\mathrm{cm^2$}$$ given that $$1\ \mathrm{m} = 1.0936\ \mathrm{yd}.$$

Accepted Answer

$$3.24 	imes 10^4$

Question 6

Which of the following pairs is correct?

Accepted Answer

Nitrite ion, NO$$_2^-$$

Question 7

What is the percentage by mass of Cl in $$\mathrm{Mn($$ClO_4$$)_2}$$?

Accepted Answer

$$16.44\%$$

Question 8

Which of the following is NOT an empirical formula?

Accepted Answer

C$$_2H$_4O$_2$$

Question 9

When $$22.34\ \mathrm{g}$$ iron is consumed in the following unbalanced reaction, how many grams of hydrogen gas will be produced?

$$\mathrm{$$HNO_3$$(aq) + Fe(s) \rightarrow H_2$(g) + Fe(NO_3$)_3(aq)}$$

Accepted Answer

$$1.210\ \mathrm{g}$$

Question 10

How many moles of hydrogen atoms are in $$2.0158\ \mathrm{g} of $$molecular hydrogen?

Accepted Answer

$$1.0\ \mathrm{mol}$$

Question 11

A sample of gas is contained in a sealed container with flexible walls. Which will result in the volume of the container being reduced to $$\frac{1}{2} of $$the original volume?

Accepted Answer

Increase pressure by 2 and constant T

Question 12

A $$4.50\ \mathrm{L}$$ sample of neon occupies $$4.50\ \mathrm{L} at$$ $$30.0\ ^\circ\mathrm{C}$$ and $$2.50\ \mathrm{atm}. $$What volume will it occupy at $$1000.0\ \mathrm{torr}$$ and $$300.\ ^\circ\mathrm{C}$$?

Accepted Answer

$$1620\ \mathrm{mL}$$

Question 13

Volume is proportional to temperature at fixed pressure. This is:

Accepted Answer

Charles's Law

Question 14

An $$11.2\ \mathrm{L}$$ flask contains $$0.25\ \mathrm{mol}$$ hydrogen and $$0.25\ \mathrm{mol}$$ radon gas at $$273\ ^\circ\mathrm{C}. $$What is the pressure in the flask?

Accepted Answer

$$1.0\ \mathrm{atm}$$

Question 15

If a gas absorbs heat, which of the following is always true?

Accepted Answer

None of the above are necessarily true.

Question 16

A substance has the empirical formula $$\mathrm{C_2H_4O}. If $$its molar mass is $$88\ \mathrm{g/mol}$$, its true formula is:

Accepted Answer

$$\mathrm{C_4H_8O_2}$$

Question 17

What is the molarity of $$175\ \mathrm{mL} of a $$solution when $$2.18\ \mathrm{g} of$$ $$\mathrm{Na_2SO_4 \cdot 10H_2O} is $$dissolved in just enough water?

Accepted Answer

$$0.00678\ \mathrm{M}$$

Question 18

Which of the following is NOT a chemical change?

Accepted Answer

Some pulp shows up in a bottle of previously well-mixed orange juice.

Question 19

How many grams of $$\mathrm{$$AgNO_3$$}$$ are required to make $$750\ \mathrm{mL} of a$$ $$0.100\ \mathrm{M}$$ solution?

Accepted Answer

$$12.7\ \mathrm{g}$$

Question 20

A compound contains $$40.0\% C$$, $$6.67\% H$$, and the rest is O. If this compound has a molar mass of $$120\ \mathrm{g/mol}$$, what is the molecular formula of this compound?

Accepted Answer

$$\mathrm{C_4H_8O_2}$$

General Chemistry I: Practice Exam 1 Study Guide

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