Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of atoms from two or more different elements chemically bonded together.

Question 2

Which physical property is most useful for identifying a substance, regardless of the amount present?

Accepted Answer

Density

Question 3

A student measures the mass of a cube as $$8.00\ \mathrm{g}$$ and its volume as $$2.00\ \mathrm{cm}^3. $$What is the density of the cube?

Accepted Answer

$$4.00\ \mathrm{g/cm}^3$$

Question 4

Which separation technique would be most effective for separating a mixture of sand and salt water?

Accepted Answer

Filtration

Question 5

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

Accepted Answer

Flammability

Question 6

A sample of water is heated from $$20\ ^\circ\mathrm{C} to$$ $$100\ ^\circ\mathrm{C}. $$What type of change is this?

Accepted Answer

Physical change

Question 7

Which statement about elements and compounds is correct?

Accepted Answer

Compounds are made of two or more elements in fixed proportions.

Question 8

Which of the following is a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 9

A student records the following measurements: $$2.54\ \mathrm{cm}$$, $$2.55\ \mathrm{cm}$$, $$2.53\ \mathrm{cm}$$, and $$2.54\ \mathrm{cm}. $$The true value is $$2.80\ \mathrm{cm}. $$Which statement best describes the data?

Accepted Answer

Low accuracy, high precision

Question 10

Which of the following is the correct SI base unit for temperature?

Accepted Answer

Kelvin ($$\mathrm{K})$$

Question 11

Convert $$25.0\ ^\circ\mathrm{C} to $$Fahrenheit using the correct formula.

Accepted Answer

$$77.0\ ^\circ\mathrm{F}$$

Question 12

Which of the following is a derived SI unit?

Accepted Answer

Liter ($$\mathrm{L})$$

Question 13

A chemical reaction occurs when copper reacts with nitric acid, producing a blue solution and a brown gas. Which property is being observed?

Accepted Answer

Chemical property

Question 14

Which of the following is an extensive property?

Accepted Answer

Mass

Question 15

A student wants to separate the components of ink. Which method should they use?

Accepted Answer

Chromatography

Question 16

Which equation correctly expresses the relationship for kinetic energy?

Accepted Answer

$$KE = \dfrac{1}{2}mv^2$

Question 17

How many significant figures are in the measurement $$0.00450\ \mathrm{g}$$?

Accepted Answer

3

Question 18

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

Accepted Answer

Salad dressing with oil and vinegar

Question 19

A student needs to convert $$5.00\ \mathrm{in} to $$centimeters. Which conversion factor should they use?

Accepted Answer

$$1\ \mathrm{in} = 2.54\ \mathrm{cm}$$

Question 20

Which statement about the Law of Definite Proportions is correct?

Accepted Answer

The composition of a compound is always the same in any sample.

Introduction to Matter, Energy, and Measurement

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