Question 1

A student measures the mass of a sample as 12.34 g and its volume as 4.5 mL. What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$2.7\ \mathrm{g/mL}$$

Question 2

Which of the following best describes the emission spectrum observed in a flame test?

Accepted Answer

A set of discrete lines unique to each element

Question 3

Convert a temperature of $$25\ ^\circ\mathrm{C} to $$Fahrenheit using the correct formula.

Accepted Answer

$$77\ ^\circ\mathrm{F}$$

Question 4

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

Accepted Answer

$$\mathrm{Ba}_3(\mathrm{PO}_4)_2$$

Question 5

A reaction is classified as: $$2\mathrm{KClO}_3 \rightarrow 2\mathrm{KCl} + 3\mathrm{O}_2. $$What type of reaction is this?

Accepted Answer

Decomposition

Question 6

Which of the following compounds is most likely to dissolve in water based on polarity?

Accepted Answer

$$\mathrm{NaCl}$$

Question 7

A sample of gas occupies $$2.0\ \mathrm{L} at$$ $$1.0\ \mathrm{atm}$$ and $$300\ \mathrm{K}. $$What will the volume be at $$2.0\ \mathrm{atm}$$ and $$300\ \mathrm{K}$$, assuming the amount of gas is constant?

Accepted Answer

$$1.0\ \mathrm{L}$$

Question 8

Which of the following is the correct Lewis structure for carbon tetrachloride ($$\mathrm{CCl}_4$$)?

Accepted Answer

Central C atom with four single bonds to Cl atoms, each Cl with three lone pairs

Question 9

Which of the following is the correct name for $$\mathrm{PbO}_2$$?

Accepted Answer

Lead(IV) oxide

Question 10

A hydrate sample weighs $$5.00\ \mathrm{g}$$ before heating and $$3.00\ \mathrm{g}$$ after heating. If the anhydrous salt is $$\mathrm{CuSO}_4$$, what is the percent by mass of water lost?

Accepted Answer

$$40\%$$

Question 11

Which of the following is the correct formula for iron(II) nitride?

Accepted Answer

$$\mathrm{Fe}_3\mathrm{N}_2$$

Question 12

A student needs to prepare $$250\ \mathrm{mL} of a$$ $$0.50\ \mathrm{M}$$ NaCl solution. How many grams of NaCl are required? ($$\mathrm{Na} = 23.0,\ \mathrm{Cl} = 35.5)$$

Accepted Answer

Question 13

Which of the following is the correct name for $$\mathrm{Ca(ClO}_4)_2$$?

Accepted Answer

Calcium perchlorate

Question 14

Which of the following is a correct safety practice in the chemistry lab?

Accepted Answer

Wearing safety goggles at all times

Question 15

Which of the following is the correct formula for stannous hydroxide?

Accepted Answer

$$\mathrm{Sn(OH)}_2$$

Question 16

A student records a measurement as 15.20 mL. Which digit is the estimated digit?

Accepted Answer

The last digit (0)

Question 17

Which of the following is the correct name for $$\mathrm{CCl}_4$$?

Accepted Answer

Carbon tetrachloride

Question 18

Which of the following best describes the relationship between pressure and volume for a gas at constant temperature?

Accepted Answer

They are inversely proportional ($$P \propto \frac{1}{V})$$

Question 19

How many significant figures are in the measurement 0.00450 g?

Accepted Answer

3

GOB Chemistry Lab Exam Review: Step-by-Step Guidance

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