Q: A box measures 1.2 inches in width, 6.5 cm in length, and 27 mm in height. What is the volume of the box in cubic meters? (1 inch = 2.54 cm)

$$1.2 in$$ $$\times 2.54 cm/in$$ $$= 3.05 cm$$; $$3.05 cm$$ $$\times 6.5 cm$$ $$\times 2.7 cm$$ $$= 53.6 cm$^3$$; $$53.6 cm$^3 = 5.36 \times 10$$^{-5}$$ m^3$

Q: A nugget has a mass of $$2.25 \times 10$$^{-2}$$ kg and a volume of 2.38$ cm^3$. What is its density in g/cm^3$? Is it likely to be gold? (Gold: 19.3$ g/cm^3$)

$$2.25 \times 10$$^{-2}$$ kg = 22.5$ g; d$$ = \frac{22.5}{2.38} = 9.45$$ g/cm^3$; Not gold

Question 1

Which of the following is NOT a technological advancement made possible by understanding chemistry?

Accepted Answer

The ability to change lead or other metals into gold

Question 2

Which of the following best describes a scientific law?

Accepted Answer

A summary of past observations that predicts future ones

Question 3

Rachel Carson is best known for her work in which area of chemistry?

Accepted Answer

Green chemistry and environmental awareness

Question 4

Which of the following statements is a scientific theory?

Accepted Answer

All matter is made of tiny, indestructible particles called atoms.

Question 5

A hypothesis must be:

Accepted Answer

Testable and falsifiable

Question 6

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

Accepted Answer

Melting point of ice

Question 7

Which of the following changes is a chemical change?

Accepted Answer

Iron rusting

Question 8

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements in fixed proportions

Question 9

Which of the following is a homogeneous mixture?

Accepted Answer

Sweat

Question 10

A box measures 1.2 inches in width, 6.5 cm in length, and 27 mm in height. What is the volume of the box in cubic meters? (1 inch = 2.54 cm)

Accepted Answer

$$1.2 in$$ $$	imes 2.54 cm/in$$ $$= 3.05 cm$$; $$3.05 cm$$ $$	imes 6.5 cm$$ $$	imes 2.7 cm$$ $$= 53.6 cm$^3$$; $$53.6 cm$^3 = 5.36 	imes 10$$^{-5}$$ m^3$

Question 11

Which of the following is an intensive property?

Accepted Answer

Density

Question 12

A nugget has a mass of $$2.25 	imes 10$$^{-2}$$ kg and a volume of 2.38$ cm^3$. What is its density in g/cm^3$? Is it likely to be gold? (Gold: 19.3$ g/cm^3$)

Accepted Answer

$$2.25 	imes 10$$^{-2}$$ kg = 22.5$ g; d$$ = \frac{22.5}{2.38} = 9.45$$ g/cm^3$; Not gold

Question 13

Which of the following conversions is correct for temperature?

Accepted Answer

$$^\circ C = ( ^\circ F - 32 ) / 1.8$$

Question 14

Which of the following is an example of applied research?

Accepted Answer

Developing a new pesticide to reduce crop loss

Question 15

Which of the following best describes a heterogeneous mixture?

Accepted Answer

Vegetable soup

Question 16

Which of the following is a correct SI unit and its quantity?

Accepted Answer

Second (s) – time

Question 17

Which of the following is a chemical property of carbon monoxide?

Accepted Answer

It is toxic (combines with hemoglobin, causing anoxia)

Question 18

A student converts 1245 kg to grams and milligrams. What are the correct values?

Accepted Answer

$$1245 kg$$ $$= 1,245,000 g$; 1,245,000,000 mg$$

Question 19

Which of the following is a requirement for a claim to be considered scientific?

Accepted Answer

It must be falsifiable

Introduction to Chemistry: Foundations, Matter, and Measurement

Guida di studio - Domande di pratica

Study guide - Flashcard