Chemistry - Unit 1 Test

Question 1

Organic Chemistry

Answer 1

Study of carbon

Question 2

Inorganic Chemistry

Answer 2

Study of compounds without carbon

Question 3

Analytical Chemistry

Answer 3

Identifying composition and components of compounds

Question 4

Physical Chemistry

Answer 4

Deals with physical properties of compounds

Question 5

Biochemistry

Answer 5

Chemistry of life

Question 6

Scientific method

Answer 6

An approach to the solution of scientific problems

Question 7

Observation

Answer 7

What you see and question

Question 8

Inference

Answer 8

A conclusion based on evidence and reasoning

Question 9

Hypothesis

Answer 9

Proposed reason for what is observed

Question 10

Experiment

Answer 10

Using a controlled experiment to test hypothesis

Question 11

Theory

Answer 11

A thoroughly tested explanation of why experiments give certain results. More experiments are then done to test the theory.

Question 12

Scientific Law

Answer 12

Concise statement that summarizes the results of a broad spectrum of observations and experiments. Result in a mathematical relationship via an equation.

Question 13

Dependent variable

Answer 13

The variable that changes because of the independent variable (Y)

Question 14

Independent variable

Answer 14

The variable that is changed by the experiments (X)

Question 15

Control group

Answer 15

The group that is undergoing an experiment

Question 16

Qualitative measurement

Answer 16

These are relative and based in comparison or intuition

Question 17

Quantitative measurement

Answer 17

These are numerical results based on some accepted norm or standardized unit

Question 18

Accuracy

Answer 18

The closeness of a measurement to the true value

Question 19

Precision

Answer 19

The reproducibility of a measure (the # of sig. figs). We do not care if the measurement is correct only if we keep getting it.

Question 20

SI system of units

Answer 20

The metric system which is most used to measure different objects

Question 21

Derived units

Answer 21

Units made up of combinations of SI base units

Question 22

Density

Answer 22

A temperature and pressure dependent physical characteristics. As temp. increases volume increases and density decreases.

Question 23

% error

Answer 23

The word we use for the difference between an experimental/measured value and the true/accepted value.
Estimated - Actual = Error, Error/Actual x 100

Question 24

Matter

Answer 24

Anything that takes up space and has mass

Question 25

Mass

Answer 25

Number of atoms and the density of the atoms

Question 26

Substance

Answer 26

Matter that has a uniform and definite composition

Question 27

Solid

Answer 27

Has a definite shape and volume

Question 28

Liquid

Answer 28

Has a definite volume but flows and takes the shape of th container it is in

Question 29

Gas

Answer 29

Takes both the shape and the volume of the container it is in

Question 30

Heterogeneous mixture

Answer 30

NOT uniform in composition (soil, pond water)

Question 31

Homogeneous mixture

Answer 31

ARE uniform in composition (Salt water, alloys)

Question 32

Compound

Answer 32

Substances that can be separated into simpler substances only by chemical reactions

Question 33

Element

Answer 33

Simplest form of matter that can exist under normal laboratory conditions

Question 34

Law of conservation of mass

Answer 34

"Mass is neither created nor destroyed in chemical reactions."

Question 35

Chemical reaction

Answer 35

A chemical reaction is where reactants go to products. Often result in both a chemical and physical change of the substances that were involved.

Question 36

Physical properties

Answer 36

A physical property is something we can use to identify a certain substance. Ex. color, size, shape, smell, etc.