Ch. 1

Question 1

Chemists go about research using a set of guidelines and practices known as….

Answer 1

Scientific method

Question 2

The study of matter and the changes that matter undergo.

Answer 2

Chemistry

Question 3

Anything that has mass and occupies space.

Answer 3

Matter

Question 4

Visible to the human eye

Answer 4

Macroscopic level

Question 5

Natural phenomena and measured events. If they are universally consistent they become laws.

Answer 5

Observations

Question 6

Tentative explanations that explain observations.

Answer 6

Hypothesis

Question 7

Procedure to test hypothesis.

Answer 7

Experiment

Question 8

What happens if the experimental results do not support the hypothesis?

Answer 8

Then the hypothesis has to be revised.

Question 9

Set of conceptual assumptions that explains data from accumulated experiments.

Answer 9

Model Theory

Question 10

This tests predictions based on model theory.

Answer 10

Further experiment

Question 11

Matter is either a ______ or a __________.

Answer 11

Substance

Mixture

Question 12

Form of matter that is definite.

Answer 12

Substance

Question 13

Substances can be ____ or _____.

Answer 13

Compounds or elements

Question 14

Mixtures can be ______ or ________.

Answer 14

Homogenous or heterogenous

Question 15

The three states of matter are solid, liquid, and gas.
Solids and liquids are collectively known as ______.
Liquids and gases are collectively known as ______.

Answer 15

Condensed phases

Fluids

Question 16

Properties that can be measured because they are expressed using numbers.

Answer 16

Quantitative properties

Question 17

Kelvin=C+_______

Answer 17

273.15

Question 18

Temperature in C=(temp in F-32) x ?

Answer 18

5 C/9F

Question 19

temp in F=9 F/5C x(temp in C) +?

Answer 19

32 F

Question 20

Ratio of mass to volume

Answer 20

Density

Question 21

Measured it expressed with a number.

Answer 21

Quantitative

Question 22

Not requiring explicit measurement.

Answer 22

Quantitative

Question 23

These are properties that can be determined without the matter in question undergoing a chemical change.
The identity of the matter involved does not change.

Answer 23

Physical properties

Question 24

These are properties determined only as a result of a ____ change in which the original substance is converted to a different substance.

Answer 24

Chemical properties

Question 25

Physical and chemical properties can be _____ and _____.

Answer 25

Extensive and intensive

Question 26

This is dependent on the amount of matter.

Answer 26

Extensive

Question 27

This is independent of the amount of matter.

Answer 27

Intensive

Question 28

Measured numbers are _____.

Answer 28

Inexact

Question 29

Numbers obtained by counting or that are part of a definition are _____ numbers.

Answer 29

Exact

Question 30

These are used to specify the uncertainty in a measured number or in a number calculated using measured numbers. They must be carried through calculations such that the implied uncertainty in the final answer is reasonable.

Answer 30

Significant figures.

Question 31

This refers to how close measured numbers are to a true value.

Answer 31

Accuracy

Question 32

This referee to how close measured numbers are to one another.

Answer 32

Precision

Question 33

This is a fraction in which the numerator and denominator are in the same quantity expressed in different units.

Answer 33

Conversion factor

Question 34

This is a series of unit conversions used in the solution of a multi step problem.

Answer 34

Dimensional analysis.

Question 35

What is the formula for density?

Answer 35

D=m/v

Question 36

Densities are expressed in what?

Answer 36

g/cm^3