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 sample of gold has a mass of 301 g and a volume of 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 student measures the mass of a liquid as $$13.6\ \mathrm{g}$$ and its volume as $$1.00\ \mathrm{mL}. $$What is the density of the liquid?

Accepted Answer

$$13.6\ \mathrm{g/mL}$$

Question 5

Which of the following is a chemical change?

Accepted Answer

Hydrogen burning in air to form water

Question 6

Convert $$25\ ^\circ\mathrm{C} to $$Kelvin.

Accepted Answer

$$298.15\ \mathrm{K}$$

Question 7

Which of the following statements about mixtures is correct?

Accepted Answer

A homogeneous mixture has a uniform composition throughout.

Question 8

A compound is best defined as:

Accepted Answer

A substance composed of atoms of two or more elements chemically united in fixed proportions.

Question 9

A student adds $$2.50\ \mathrm{g} of $$salt to $$47.5\ \mathrm{g} of $$water. What is the total mass of the solution, and how many significant figures should the answer have?

Accepted Answer

$$50.0\ \mathrm{g}$$, 3 significant figures

Question 10

Which of the following is the correct conversion factor to change $$1\ \mathrm{cm}^3 to$$ $$\mathrm{mL}$$?

Accepted Answer

$$1\ \mathrm{cm}^3 = 1\ \mathrm{mL}$$

Question 11

A laboratory balance gives a reading of $$0.00420\ \mathrm{g}. $$How many significant figures does this measurement have?

Accepted Answer

3

Question 12

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

Accepted Answer

Salt dissolved in water

Question 13

A student needs to convert $$0.0833\ \mathrm{lb} of $$glucose to milligrams. Given $$1\ \mathrm{lb} = 453.6\ \mathrm{g}$$, what is the correct sequence of conversion factors?

Accepted Answer

$$\mathrm{lb} \rightarrow \mathrm{g} \rightarrow \mathrm{mg}$$

Question 14

Which of the following is an extensive property?

Accepted Answer

Mass

Question 15

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

$$74.8\ \mathrm{g}$$

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 an example of a physical change?

Accepted Answer

Melting ice

Question 19

Which SI prefix represents $$10^{-6}$$?

Accepted Answer

Micro-

Question 20

A student calculates the volume of a cylinder using $$V = \pi r^2$ h. If $$the radius is $$1.0\ \mathrm{cm}$$ and the height is $$18\ \mathrm{cm}$$, what is the volume in $$\mathrm{cm}^3 (to $$two significant figures)?

Accepted Answer

$$57\ \mathrm{cm}^3$$

Chapter 1: Chemistry in Our Lives – Foundations and Measurements

Guida di studio - Domande di pratica

Study guide - Flashcard