$$\mathrm{0.00032 = 3.2 \times 10$$^{-4}$$}$$

$$\mathrm{q = SH \times m \times \Delta T}$$

Question 1

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Sugar water

Question 2

Which statement best describes a physical change?

Accepted Answer

A change in the state of matter without altering the chemical identity.

Question 3

What is the correct balanced equation for the reaction between hydrogen and oxygen to form water?

Accepted Answer

$$\mathrm{2H_2(g) + O_2$(g) \rightarrow 2H_2O(g)}$$

Question 4

A block has a mass of 1100 g and a volume of 85 mL. What is its density?

Accepted Answer

$$\mathrm{12.9\ g/mL}$$

Question 5

Which of the following is NOT a pure substance?

Accepted Answer

Fish tank water

Question 6

Convert 5 g/mL to mg/dL.

Accepted Answer

$$\mathrm{500\ mg/dL}$$

Question 7

How many significant figures are in the measurement 0.00450 g?

Accepted Answer

3

Question 8

Which of the following numbers is correctly expressed in scientific notation?

Accepted Answer

$$\mathrm{0.00032 = 3.2 	imes 10$$^{-4}$$}$$

Question 9

A patient’s body temperature is measured at 102.2 °F. What is this temperature in Celsius?

Accepted Answer

$$\mathrm{39.0\ ^\circ C}$$

Question 10

Which of the following statements about specific gravity is TRUE?

Accepted Answer

Specific gravity is the ratio of the density of a sample to the density of water and is unitless.

Question 11

A granola bar contains 20 Calories. How many joules is this?

Accepted Answer

$$\mathrm{83,680\ J}$$

Question 12

Which formula is used to calculate the amount of heat absorbed by a substance?

Accepted Answer

$$\mathrm{q = SH 	imes m 	imes \Delta T}$$

Question 13

Which of the following best describes the arrangement and movement of particles in a gas?

Accepted Answer

Far apart, moving rapidly and randomly

Question 14

A child should receive only 75% of the adult dose of a medication. If the adult dose is 280 mg, what dose should the child receive?

Accepted Answer

$$\mathrm{210\ mg}$$

Question 15

Which of the following is an example of a chemical change?

Accepted Answer

Burning wood

Question 16

A solution contains 1 g of protein in a total mass of 3 g. What is the percent by mass of protein?

Accepted Answer

$$\mathrm{33.3\%}$$

Question 17

Which of the following is an exact number?

Accepted Answer

1 dozen eggs

Question 18

Which conversion factor would you use to convert 10 dL to L?

Accepted Answer

$$\mathrm{1\ L / 10\ dL}$$

Question 19

Which of the following statements about significant figures in calculations is correct?

Accepted Answer

For multiplication and division, the answer should match the least number of significant digits in the measured numbers.

Chemistry Basics—Matter and Measurement (GOB Chemistry Chapter 1 Study Notes)

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