Question 1

Which of the following statements best describes the difference between a physical and a chemical property?

Accepted Answer

A chemical property is related to the substance's ability to undergo changes that transform it into different substances.

Question 2

A student measures the mass of a sample as 0.00450 kg. How many significant figures are in this measurement?

Accepted Answer

3

Question 3

Which of the following is the correct chemical symbol for potassium?

Accepted Answer

K

Question 4

A reaction in a hand warmer releases heat to the surroundings. What type of reaction is this?

Accepted Answer

Exothermic

Question 5

Convert 0.00056 m to scientific notation.

Accepted Answer

$5.6 	imes 10^{-5}$ m

Question 6

Which of the following is a correct application of the addition-subtraction rule for significant figures? Calculate $12.11 + 0.034$.

Accepted Answer

$12.14$

Question 7

A sample of water has a mass of 250 g and a volume of 250 mL. What is its density?

Accepted Answer

$1.0 \ \mathrm{g/mL}$

Question 8

Which of the following elements is a non-metal?

Accepted Answer

Oxygen

Question 9

Which of the following is the correct formula for a binary ionic compound formed between magnesium and chlorine?

Accepted Answer

$\mathrm{MgCl_2}$

Question 10

A student needs to convert 25.0 °C to Kelvin. What is the correct temperature in Kelvin?

Accepted Answer

$298.15 \ \mathrm{K}$

Question 11

Which of the following is the correct charge for a sulfate ion?

Accepted Answer

$-2$

Question 12

Which of the following is a correct conversion factor for changing centimeters to meters?

Accepted Answer

$1 \ \mathrm{cm} = 0.01 \ \mathrm{m}$

Question 13

Which of the following best describes the scientific method?

Accepted Answer

A systematic approach to research involving observation, hypothesis, experimentation, and conclusion.

Question 14

Which of the following ions has a charge of $+1$?

Accepted Answer

Sodium ion ($\mathrm{Na^+}$)

Question 15

Which of the following is the correct symbol for the element with atomic number 8?

Accepted Answer

O

Question 16

A compound contains only sodium and oxygen. What is the correct formula for this compound?

Accepted Answer

$\mathrm{Na_2O}$

Question 17

Which of the following statements about metals is correct?

Accepted Answer

Metals tend to lose electrons to form positive ions.

Question 18

Which of the following is the correct process for solving a dimensional analysis problem?

Accepted Answer

Multiply by the conversion factor so that the units cancel appropriately.

Question 19

Which of the following is a diatomic element?

Accepted Answer

Nitrogen ($\mathrm{N_2}$)

Question 20

A student is asked to determine the number of significant figures in the result of $3.20 	imes 0.0045$. What is the correct number of significant figures in the answer?

Accepted Answer

2

Exam 1 Study Guide: Introduction to Chemistry – Key Concepts & Expectations

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