Question 1

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

Accepted Answer

Brass (an alloy of copper and zinc)

Question 2

Which statement best describes a compound?

Accepted Answer

A pure substance made of two or more elements chemically joined together

Question 3

Which of the following is the correct chemical formula for table salt?

Accepted Answer

$$\mathrm{NaCl}$$

Question 4

A student measures the mass of a sample as 12.50 g and its volume as 5.00 mL. What is the density of the sample?

Accepted Answer

$$2.50\ \mathrm{g/mL}$$

Question 5

Which of the following changes is a chemical change?

Accepted Answer

Burning wood

Question 6

How many significant figures are in the measurement 0.00450 g?

Accepted Answer

3

Question 7

Convert 250 mL to liters using the correct conversion factor.

Accepted Answer

$$0.25\ \mathrm{L}$$

Question 8

Which of the following 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 9

A patient’s body temperature is measured as 39.0 °C. What is this temperature in Fahrenheit?

Accepted Answer

$$102.2\ ^\circ\mathrm{F}$$

Question 10

Which of the following is NOT a property of gases?

Accepted Answer

Definite volume

Question 11

What is the specific gravity of a liquid sample with a density of $$1.20\ \mathrm{g/mL}$$? (Density of water is $$1.00\ \mathrm{g/mL})$$

Accepted Answer

$$1.20$$

Question 12

Which of the following is the correct relationship for converting Celsius to Kelvin?

Accepted Answer

$$\mathrm{K} = \mathrm{C} + 273$$

Question 13

A medication is prescribed at 0.5 mg/kg for a patient weighing 70 kg. What is the total dose required?

Accepted Answer

$$35\ \mathrm{mg}$$

Question 14

Which of the following is an example of potential energy?

Accepted Answer

A stretched rubber band

Question 15

What is the correct number of significant figures in the result of $$2.50 	imes 3.0$$?

Accepted Answer

2

Question 16

Which of the following is the correct scientific notation for 0.00056?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 17

A sample of water absorbs 4184 J of heat and its temperature increases by $$10.0\ ^\circ\mathrm{C}. If $$the mass of water is 100.0 g, what is the specific heat?

Accepted Answer

$$4.18\ \mathrm{J/g}^\circ\mathrm{C}$$

Question 18

Which of the following is a micronutrient essential for human health?

Accepted Answer

Iron

Question 19

Which of the following best describes the law of conservation of mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 20

A nutrition label states that a serving contains 8 g of protein, which is 16% of the daily value. What is the total daily value for protein?

Accepted Answer

$$50\ \mathrm{g}$$

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

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