$$F = (224 \times \frac{9}{5}) + 32 = 415.2$$^{\circ}$$F$$

$$0.0833 \times 453.6 \times 1000 = 37,800\ \mathrm{mg}$$

$$13.6 \times 5.50 = 74.8\ \mathrm{g}$$

Question 1

Which of the following best describes a hypothesis in the scientific method?

Accepted Answer

A tentative explanation for a set of observations.

Question 2

A student measures the mass of a gold bar as 301 g and its volume as 15.6 mL. What is the density of gold in $$\mathrm{g/mL}$$?

Accepted Answer

$$19.3\ \mathrm{g/mL}$$

Question 3

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 4

A mixture of iron filings and sand can be separated by which physical method?

Accepted Answer

Using a magnet

Question 5

Which of the following statements about compounds is correct?

Accepted Answer

Compounds can only be separated into their elements by chemical means.

Question 6

Convert 224°C (the melting point of solder) to degrees Fahrenheit using the correct formula.

Accepted Answer

$$F = (224 	imes \frac{9}{5}) + 32 = 415.2$$^{\circ}$$F$$

Question 7

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

Accepted Answer

Hydrogen burns in air to form water.

Question 8

A student records the following measurements: 0.00420 g, 2.0 mg, and 606 m. How many significant figures are in each measurement, respectively?

Accepted Answer

3, 2, 3

Question 9

A person’s average daily intake of glucose is 0.0833 lb. What is this mass in milligrams (mg)? (1 lb = 453.6 g)

Accepted Answer

$$0.0833 	imes 453.6 	imes 1000 = 37,800\ \mathrm{mg}$$

Question 10

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture with the same composition throughout.

Question 11

Which SI prefix corresponds to $$10^{-6}$$?

Accepted Answer

micro-

Question 12

A sample of mercury has a density of $$13.6\ \mathrm{g/mL}. $$What is the mass of $$5.50\ \mathrm{mL} of $$mercury?

Accepted Answer

$$13.6 	imes 5.50 = 74.8\ \mathrm{g}$$

Question 13

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 14

Which of the following is an extensive property?

Accepted Answer

Volume

Question 15

A student adds 2.56 g, 3.1 g, and 0.045 g. What is the sum, rounded to the correct number of significant figures?

Accepted Answer

$$5.7\ \mathrm{g}$$

Question 16

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

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 17

Which of the following best describes the difference between accuracy and precision?

Accepted Answer

Accuracy is how close a measurement is to the true value; precision is how close measurements are to each other.

Question 18

Which of the following is a real-world example of a chemical change?

Accepted Answer

Iron rusting in the presence of oxygen.

Question 19

Which of the following is an example of a substance?

Accepted Answer

Pure water

Chapter 1: Chemistry in Our Lives – Structured Study Notes

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