Question 1

Which of the following best describes a compound?

Accepted Answer

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

Question 2

Which statement about the Law of Constant Composition is correct?

Accepted Answer

A compound always contains the same elements in the same proportion by mass.

Question 3

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

Accepted Answer

Melting ice to form liquid water.

Question 4

A student measures the mass of a sample as 12.305 g. How many significant figures are in this measurement?

Accepted Answer

5

Question 5

Which of the following is an extensive property?

Accepted Answer

Mass

Question 6

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

Accepted Answer

Micro

Question 7

A solar panel converts sunlight into electricity. Which type of energy transformation is primarily involved?

Accepted Answer

Radiant energy to electrical energy

Question 8

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 9

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

Accepted Answer

Kelvin

Question 10

A sample of water is heated from 25°C to 100°C. Which property of water changes during this process?

Accepted Answer

Its physical state

Question 11

Which of the following is true about gases?

Accepted Answer

They fill the container they are placed in.

Question 12

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 13

Which of the following numbers has 3 significant figures?

Accepted Answer

0.0486

Question 14

Which equation correctly expresses kinetic energy?

Accepted Answer

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

Question 15

A student wants to convert 3.000 meters to inches. Which sequence of conversion factors should be used?

Accepted Answer

$$1\,m = 100\,cm$$, $$1\,in = 2.54\,cm$$

Question 16

Which of the following is an exact number?

Accepted Answer

The number of centimeters in an inch ($$1\,in = 2.54\,cm)$$

Question 17

A student adds $$6.578$$ and $$2.0. $$What is the correct answer with proper significant figures?

Accepted Answer

$$8.6$$

Question 18

Which of the following is the correct scientific notation for 0.000 023?

Accepted Answer

$$2.3 	imes 10$$^{-5}$$

Question 19

A cup contains $$12.0\,in^3$ of tea. What is the volume in mL? (1$$\,$$in^3 = 16.3871$$\,$$cm^3$$, $$1\,mL = 1\,cm^3$)

Accepted Answer

$$196.6\,mL$$

Question 20

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture whose components are not evenly distributed.

General Chemistry I - CHM 101: Introduction and Chapter 1 Study Notes

Guida di studio - Domande di pratica