Q: Convert 0.0250 km to centimeters using dimensional analysis.

$2.50 \times 10^4\ \mathrm{cm}$

Q: If the pH of a solution is 3.00, what is the hydrogen ion concentration $[\mathrm{H^+}]$?

$[\mathrm{H^+}] = 1.0 \times 10^{-3}\ \mathrm{M}$

Question 1

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 2

A student mixes sand and salt in a beaker. Which separation technique would best separate these two substances?

Accepted Answer

Filtration

Question 3

Which of the following pairs of elements will most likely form an ionic compound?

Accepted Answer

Sodium and Chlorine

Question 4

A student measures the mass of a sample as 12.345 g. If the balance is accurate to 0.001 g, how many significant figures should be reported?

Accepted Answer

5

Question 5

Which statement best describes the difference between accuracy and precision?

Accepted Answer

Accuracy is how close measurements are to the true value; precision is how close measurements are to each other.

Question 6

Which state of matter has a definite volume but no definite shape?

Accepted Answer

Liquid

Question 7

A block of metal has a mass of 45.0 g and a volume of 15.0 cm$^3$. What is its density?

Accepted Answer

$3.0\ \mathrm{g/cm^3}$

Question 8

Which of the following elements is a metalloid?

Accepted Answer

Silicon

Question 9

Convert 0.0250 km to centimeters using dimensional analysis.

Accepted Answer

$2.50 	imes 10^4\ \mathrm{cm}$

Question 10

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula?

Accepted Answer

$\mathrm{CH_2O}$

Question 11

Which of the following is the solute in a solution of salt water?

Accepted Answer

Salt

Question 12

Which solution is most likely to be unsaturated?

Accepted Answer

A solution in which more solute can dissolve

Question 13

According to Beer's Law, which equation correctly relates absorbance ($A$), molar absorptivity ($\varepsilon$), path length ($l$), and concentration ($c$)?

Accepted Answer

$A = \varepsilon l c$

Question 14

How many moles of oxygen atoms are present in 1.00 mole of $\mathrm{H_2SO_4}$?

Accepted Answer

4.00 moles

Question 15

If the pH of a solution is 3.00, what is the hydrogen ion concentration $[\mathrm{H^+}]$?

Accepted Answer

$[\mathrm{H^+}] = 1.0 	imes 10^{-3}\ \mathrm{M}$

Question 16

Which equation correctly relates the energy ($E$) of a photon to its frequency ($
u$)?

Accepted Answer

$E = h 
u$

Question 17

Which type of nuclear decay results in the emission of a helium nucleus?

Accepted Answer

Alpha decay

Question 18

How many protons, neutrons, and electrons are in $^{14}\mathrm{C}$ (carbon-14)?

Accepted Answer

6 protons, 8 neutrons, 6 electrons

Question 19

Which scientist is credited with discovering the electron?

Accepted Answer

Thomson

Question 20

What is the electron configuration for a neutral oxygen atom?

Accepted Answer

$1s^2\ 2s^2\ 2p^4$

General Chemistry Study Guide: Core Concepts and Skills (Units 1–3)

Study Guide - Practice Questions

Study Guide - Flashcards