Chapter 1 - Chemistry - The Study of Change

Question 1

Chemistry

Answer 1

Study of matter and the changes it undergoes

Question 2

Scientific Method

Answer 2

A systematic approach to research

Question 3

Qualitative

Answer 3

Consisting of general observation about the system

Question 4

Quantitative

Answer 4

Comprising of numbers obtained by various measurements of the system

Question 5

Hypothesis

Answer 5

A tentative explanation for a set of observations

Question 6

Law

Answer 6

A concise verbal or mathematical statement of a relationship between phenomena that is always the same under the same conditions

Question 7

Theory

Answer 7

A unifying principle that explains a body of facts and/or those laws that are based on them

Question 8

Matter

Answer 8

Anything that occupies space and had mass

Question 9

Substance

Answer 9

Form of matter that has a definite (constant) composition and distinct properties

Question 10

Mixture

Answer 10

Combination of two or more substances in which the substances retain their distinct identities

Question 11

Homogeneous mixture

Answer 11

The composition of the mixture is the same throughout

Question 12

Heterogeneous mixture

Answer 12

Composition is not uniform

Question 13

Element

Answer 13

Substance that cannot be separated into simpler substances by chemical means

Question 14

Compound

Answer 14

Substance comprised of atoms of two of more elements chemically united in fixed proportions

Question 15

Physical property

Answer 15

Can be measured and observed without changing the composition or identity of a substance

Question 16

Chemical property

Answer 16

To observe this property we must carry out a chemical change

Question 17

Extensive property

Answer 17

Depends on how much matter is being considered

Question 18

Mass

Answer 18

Quantity of matter in a given sample of a substance

Question 19

Volume

Answer 19

Length cubed

Question 20

Intensive property

Answer 20

Does not depend on how much matter is being considered

Question 21

Density

Answer 21

Mass of an object divided by its volume d=m/v

Question 22

Macroscopic properties

Answer 22

Can be determined directly

Question 23

Microscopic properties

Answer 23

On atomic or molecular scale, must be determined by an indirect method

Question 24

International System of Units (SI)

Answer 24

Revised metric system

Question 25

Weight

Answer 25

The force that gravity exerts in an object

Question 26

Liter

Answer 26

The volume occupied by one cubic decimeter

Question 27

Kelvin + temp conversions

Answer 27

The SI base unit for temperature m. Absolute temp scale

C=(F-32) (5/9)
F= (9/5)C +32
K= (C+273.15C)

Question 28

Significant figures

Answer 28

Meaningful digits in a measured or calculated quantity

Question 29

Accuracy

Answer 29

How close measurement is to true value of quantity that was measured

Question 30

Precision

Answer 30

How closely two or more measurements of same quantity agree with one another