Question 1

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object, while weight is the measure of the gravitational force on that matter.

Question 2

A sample of metal has a mass of 18.96 g and a volume of 4.31 cm$$^3. $$What is its density?

Accepted Answer

$$d = \frac{18.96}{4.31} = 4.40\ \mathrm{g/cm^3$}$$

Question 3

Which of the following is a chemical property?

Accepted Answer

Reacts with oxygen to form rust

Question 4

Which statement about scientific theories is correct?

Accepted Answer

Scientific theories are sets of tested hypotheses that explain natural phenomena and may change as new observations are made.

Question 5

A liquid has a definite volume but no definite shape. Which state of matter does this describe?

Accepted Answer

Liquid

Question 6

Which of the following is a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 7

Convert 36 $$^0C to $$Kelvin.

Accepted Answer

$$K = 36 + 273.15 = 309.15\ K$$

Question 8

Which of the following is NOT a characteristic of science?

Accepted Answer

Dogmatic

Question 9

A piece of wood is sanded to make it smooth, forming sawdust. What type of change is this?

Accepted Answer

Physical change

Question 10

Which of the following is an example of a compound?

Accepted Answer

NaCl

Question 11

What is the SI base unit for mass?

Accepted Answer

Kilogram (kg)

Question 12

Which prefix represents $$10^6$$?

Accepted Answer

mega-

Question 13

Which of the following statements about green chemistry is correct?

Accepted Answer

Green chemistry uses materials and processes intended to prevent or reduce pollution at its source.

Question 14

A scientific law can often be stated mathematically. Which of the following is an example?

Accepted Answer

$$PV = k$$

Question 15

Which of the following is a limitation of science?

Accepted Answer

Science is limited to studying observable phenomena and processes where variables can be controlled.

Question 16

Which of the following is a physical property?

Accepted Answer

Melting point

Question 17

What is the formula for density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 18

Which of the following best describes a scientific model?

Accepted Answer

A tangible item or picture used to represent invisible processes.

Question 19

Which of the following is the correct conversion for food calories?

Accepted Answer

1 Cal = 1 kcal = 4184 J

Question 20

Which of the following is NOT a compound?

Accepted Answer

O$$_2$$

Introduction to Chemistry: Foundations and Measurement

Guida di studio - Domande di pratica