Chemistry

Question 1

The study of the composition and structure of materials and of the changes that materials undergo.

Answer 1

Chemistry

Question 2

An observation of natural phenomena carried out in a controlled manner so that the results can be duplicated and rational conclusions obtained.

Answer 2

Experiment

Question 3

A concise statement or mathematical equation about a fundamental relationship or regularity of nature.

Answer 3

Law

Question 4

A tentative explanation of some regularity of nature.

Answer 4

Hypothesis

Question 5

A tested explanation of a basic natural phenomenon.

Answer 5

Theory

Question 6

Whatever occupies space and can be perceived by our senses.

Answer 6

Matter

Question 7

The quantity of matter in a material.

Answer 7

Mass

Question 8

The total mass remains constant during a chemical change (chemical reaction).

Answer 8

Law of Conservation of Mass

Question 9

characterized by rigidity; fixed volume and fixed shape.

Answer 9

Solid

Question 10

relatively incompressible fluid; fixed volume, no fixed shape.

Answer 10

Liquid

Question 11

compressible fluid; no fixed volume, no fixed shape.

Answer 11

Gas

Question 12

A change in the form of matter but not in its chemical identity.

Answer 12

Physical Change

Question 13

A change in which one or more kinds of matter are transformed into a new kind of matter or several new kinds of matter.

Answer 13

Chemical Change = Chemical Reaction

Question 14

A characteristic that can be observed for a material without changing its chemical identity.

Answer 14

Physical Property

Question 15

A characteristic of a material involving its chemical change.

Answer 15

Chemical Property

Question 16

A kind of matter that cannot be separated into other kinds of matter by any physical process such as distillation or sublimation.

Answer 16

Substance

Question 17

A substance that cannot be decomposed into simpler substances by any chemical reaction.

Answer 17

Element

Question 18

A substance composed of two or more elements chemically combined.

Answer 18

Compound

Question 19

A material that can be separated by physical means into two or more substances

Answer 19

Mixture

Question 20

One of several different homogeneous materials present in the portion of matter under study.

Answer 20

Phase

Question 21

A mixture that consists of physically distinct parts, each with different properties.

Answer 21

Heterogeneous Mixture

Question 22

A mixture that is uniform in its properties; also called a solution.

Answer 22

Homogenous Mixture

Question 23

The comparison of a physical quantity with a fixed standard of measurement—a unit.

Answer 23

Measurement

Question 24

The closeness of the set of values obtained from repeated measurement of the same quantity.

Answer 24

Precision

Question 25

The closeness of a single measurement to its true value.

Answer 25

Accuracy

Question 26

Those digits in a measured number (or in the result of a calculation with measured numbers) that include all certain digits plus a final digit having some uncertainty.

Answer 26

Significant Figures

Question 27

The number of digits reported for the value of a measured or calculated quantity, indicating the precision of the value.

Answer 27

Number of Significant Figures

Question 28

A counted number or defined number.

Answer 28

Exact Number

Question 29

The procedure of dropping nonsignificant digits and adjusting the last digit reported in the final result of a calculation.

Answer 29

Rounding

Question 30

An international system of units made up of a particular choice of metric units.

Answer 30

SI Units

Question 31

The seven metric units from which all other units can be derived.

Answer 31

Base Units

Question 32

The representation of a number in the form A × 10n

Answer 32

Scientific Notation

Question 33

A measure of “hotness” Heat flows from an area of higher temperature to an area of lower temperature.

Answer 33

Temperature

Question 34

Combinations of fundamental units.

Answer 34

Derived Units

Question 35

A factor equal to 1 that converts a quantity expressed in one unit to a quantity expressed in another unit.

Answer 35

Conversion Factor

Question 36

A method of calculations in which one carries along the units for quantities.

Answer 36

Units and Dimensional Analysis (Factor-Label Method)

Question 37

involves the qualitative and quantitative analysis of the chemistry of substances.

Answer 37

Analytical chemistry

Question 38

the study of chemical process in living organism

Answer 38

Biochemistry

Question 39

the study of carbon compounds

Answer 39

Organic Chemistry

Question 40

The Study of Non-Living substances

Answer 40

Inorganic Chemistry

Question 41

is a branch of chemistry which applies chemical and physical process towards the transformation of raw materials into products

Answer 41

Industrial Chemistry

Question 42

is the study of the chemical and physical properties of elements

Answer 42

nuclear chemistry