Q: A student needs to convert 5.00 miles to kilometers. Which equation should they use?

$$5.00 \times 1.609 = 8.05 km$$

Q: What is the correct formula to convert Celsius to Fahrenheit?

$$F = \left( \frac{1.8}{1} \times C \right) + 32$$

Q: A nutrition label states that a serving contains 145 mg of sodium. How many grams of sodium is this?

$$145 \text{ mg} \times \frac{1 \text{ g}}{1000 \text{ mg}} = 0.145 \text{ g}$$

Q: What is the density of a sample if its mass is 25.0 g and its volume is 10.0 mL?

$$\frac{25.0 \text{ g}}{10.0 \text{ mL}} = 2.50 \text{ g/mL}$$

Q: What is the percent daily value for sodium if a serving contains 2.4 g and the daily recommended amount is 4.0 g?

$$\frac{2.4}{4.0} \times 100 = 60\%$$

Q: If a nutrition label lists 2.3 g of saturated fat per serving and the daily recommended amount is 17.0 g, what is the percent daily value?

$$\frac{2.3}{17.0} \times 100 = 13.5\%$$

Question 1

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

Accepted Answer

Brass (copper and zinc)

Question 2

A student needs to convert 5.00 miles to kilometers. Which equation should they use?

Accepted Answer

$$5.00 	imes 1.609 = 8.05 km$$

Question 3

Which statement best describes a chemical change?

Accepted Answer

Burning wood to produce ash and smoke

Question 4

What is the correct formula to convert Celsius to Fahrenheit?

Accepted Answer

$$F = \left( \frac{1.8}{1} 	imes C ight) + 32$$

Question 5

A nutrition label states that a serving contains 145 mg of sodium. How many grams of sodium is this?

Accepted Answer

$$145 	ext{ mg} 	imes \frac{1 	ext{ g}}{1000 	ext{ mg}} = 0.145 	ext{ g}$$

Question 6

Which of the following is a pure substance?

Accepted Answer

Copper metal

Question 7

What is the density of a sample if its mass is 25.0 g and its volume is 10.0 mL?

Accepted Answer

$$\frac{25.0 	ext{ g}}{10.0 	ext{ mL}} = 2.50 	ext{ g/mL}$$

Question 8

Which of the following is NOT a physical property?

Accepted Answer

Ability to rust

Question 9

A student measures the mass of an object three times and gets values very close to each other, but far from the true value. This demonstrates:

Accepted Answer

High precision, low accuracy

Question 10

Which of the following elements is a micronutrient required in amounts less than 100 mg/day?

Accepted Answer

Iron (Fe)

Question 11

What is the percent daily value for sodium if a serving contains 2.4 g and the daily recommended amount is 4.0 g?

Accepted Answer

$$\frac{2.4}{4.0} 	imes 100 = 60\%$$

Question 12

Which of the following is a chemical property?

Accepted Answer

Ability to combust in oxygen

Question 13

Which of the following statements about mixtures is TRUE?

Accepted Answer

Mixtures can be separated into their components by physical means

Question 14

A sample of water is heated from 20°C to 80°C. What type of change is this?

Accepted Answer

Physical change

Question 15

Which of the following is the correct equation for converting Fahrenheit to Celsius?

Accepted Answer

$$C = \frac{(F - 32)}{1.8}$$

Question 16

Which of the following best describes a compound?

Accepted Answer

A substance made of two or more elements chemically joined in a fixed proportion

Question 17

If a nutrition label lists 2.3 g of saturated fat per serving and the daily recommended amount is 17.0 g, what is the percent daily value?

Accepted Answer

$$\frac{2.3}{17.0} 	imes 100 = 13.5\%$$

Question 18

Which of the following is NOT a correct metric conversion?

Accepted Answer

1 mi = 2.54 cm

Question 19

Which of the following best describes potential energy?

Accepted Answer

Stored chemical energy

Question 20

Which of the following is true about matter during a chemical reaction?

Accepted Answer

Matter is neither created nor destroyed

Fundamental Concepts in GOB Chemistry: Matter, Measurement, and Nutrition

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