Question 1

Which of the following best describes why chemistry is known as the central science?

Accepted Answer

Because it connects and overlaps with many other scientific disciplines, such as biology, physics, and environmental science.

Question 2

A student measures the mass of a sample as 12.340 g. How many significant figures are in this measurement?

Accepted Answer

5

Question 3

Which of the following is the correct scientific notation for the number 0.0004560?

Accepted Answer

$4.560 	imes 10^{-4}$

Question 4

Which of the following is NOT a step in the scientific method?

Accepted Answer

Ignoring data that does not fit the hypothesis

Question 5

A sample of water is measured to have a temperature of 68°F. What is this temperature in Celsius? (Use $C = \frac{5}{9}(F - 32)$)

Accepted Answer

$20^{\circ}C$

Question 6

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad with lettuce, tomatoes, and cucumbers

Question 7

Which separation technique would be most appropriate to separate sand from salt water?

Accepted Answer

Filtration

Question 8

Which of the following statements about Dalton’s Atomic Theory is correct?

Accepted Answer

All atoms of a given element are identical in mass and properties.

Question 9

Which experiment led to the discovery of the nucleus in the atom?

Accepted Answer

Rutherford’s gold foil experiment

Question 10

An atom has 17 protons, 18 neutrons, and 17 electrons. What is its mass number?

Accepted Answer

$35$

Question 11

Which of the following elements is a metalloid?

Accepted Answer

Silicon

Question 12

Which of the following best describes an ionic compound?

Accepted Answer

A compound formed by the transfer of electrons from a metal to a nonmetal

Question 13

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$(NH_4)_2SO_4$

Question 14

Which of the following best explains why metals conduct electricity?

Accepted Answer

Metals have free-moving valence electrons that allow electric current to pass through.

Question 15

Which of the following is a diatomic molecule in its natural state?

Accepted Answer

$O_2$

Question 16

What is the charge on an ion of magnesium in $MgCl_2$?

Accepted Answer

$+2$

Question 17

Which of the following is the correct order of metric prefixes from largest to smallest?

Accepted Answer

kilo, centi, milli, micro

Question 18

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula? (Assume 100 g sample)

Accepted Answer

$CH_2O$

Question 19

Which of the following best describes a physical change?

Accepted Answer

Melting ice

Question 20

Which of the following is a chemical property?

Accepted Answer

Reactivity with acid

General Chemistry: Foundations and Atomic Structure (Chapters 1-2 Study Guide)

Study Guide - Practice Questions