Module 1 (Measurement, Significant Figures, Matter)

Question 1

An assignment of number based on a characteristics of an object or event

Answer 1

Measurement

Question 2

Derived units

Answer 2

Based units in a formula

Question 3

Define accuracy and precision.

Answer 3

Accuracy is how close the measured value is to the true value. Precision is how close the measured values are to each other.

Question 4

A basis for significant figure

Answer 4

Uncertainty

Question 5

All of the digits that are known and one estimated

Answer 5

Significant Figures

Question 6

Rules in getting the significant numbers.

Answer 6

Nonzeroes are counted
Leading zeroes are not counted
Captive zeroes are counted
Trailing zeroes are counted unless decimal

Question 7

True or False.

Counted items and exactly defined quantities have an infinite number of significant figures.

Answer 7

True

Question 8

Amount of matter in an object

Answer 8

Mass

Question 9

The basic unit of mass

Answer 9

gram

Question 10

Define length

Answer 10

Distance between two points

Question 11

Define density

Answer 11

How much matter is in something

Question 12

The measure of kinetic energy in an object

Answer 12

Temperature

Question 13

The amount of space something takes up

Answer 13

Volume

Question 14

What is Chemistry?

Answer 14

The study of composition of matter and the changes it undergoes

Question 15

Define substance.

Answer 15

Substance has definite proportion and constant properties.

Question 16

Differentiate homogeneous from a heterogeneous mixture.

Answer 16

In a homogeneous mixture, the composition is uniform. Heterogeneous have different compositions.

Question 17

Differentiate two types of pure substances.

Answer 17

Elements cannot be broken down into simpler forms. A compound is a combination of two or more elements.

Question 18

Define acids.

Answer 18

An inorganic substance that breaks down in solution.

Question 19

True or False.

In acid, more hydrogen ion indicates a stronger acid.

Answer 19

True

Question 20

The concentration of hydroxide ions when added to a solution

Answer 20

Bases

Question 21

Qualities that distinguish one sample of matter from another

Answer 21

Properties of matter

Question 22

Define physical properties.

Answer 22

It can be observed without changing its chemical composition.

Question 23

Differentiate intensive and extensive properties.

Answer 23

Intensive properties are independent of amount while extensive properties depend on quantity

Question 24

It can be observed by changing the identity of a substance.

Answer 24

Chemical properties

Question 25

What are the characteristics of solids?

Answer 25

• has a neat, uniform structure
• maintain its shape regardless of the vessel
• particles are not able to move freely

Question 26

What are the characteristics of liquids?

Answer 26

• definite volume but no definite shape

- particles move together but randomly move around

Question 27

What are the characteristics of gases?

Answer 27

• no definite shape and volume

- particles move randomly