Chemistry

Question 1

have definite shapes and definite volumes

Answer 1

Solids

Question 2

have no definite shape, but they do have a
definite volume

Answer 2

Liquids

Question 3

have no definite shape or volume

Answer 3

Gas

Question 4

the lowest possible temperature

Answer 4

Absolute Zero

Question 5

Absolute scale

Answer 5

Kelvin

Question 6

Basic unit of temperature

Answer 6

Celsius

Question 7

Basic unit of time

Answer 7

Second

Question 8

It is the force a mass experience under the pull of gravity

Answer 8

Weight

Question 9

Basic unit of mass

Answer 9

Gram

Question 10

Basic unit of volume

Answer 10

Liters

Question 11

Basic unit of length

Answer 11

Meter

Question 12

It is the energy of motion.

Answer 12

Kinetic Energy

Question 13

It is a stored energy

Answer 13

Potential Energy

Question 14

the amount of heat necessary to raise the temperature of
1 g of liquid water by 1°C

Answer 14

Calorie

Question 15

official SI unit for heat is the

Answer 15

Joule

Question 16

It is the study of matter and the changes it undergoes.

Answer 16

Chemistry

Question 17

a systematic approach to research

Answer 17

Scientific method

Question 18

Consisting of general observations about the system

Answer 18

Qualitative

Question 19

Comprising numbers obtained by various measurement of the system

Answer 19

Quantitative

Question 20

tentative explanation for a set of observations.

Answer 20

Hypothesis

Question 21

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

Answer 21

Law

Question 22

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

Answer 22

Theory

Question 23

It is a form of matter that has a definite (constant) composition and distinct properties.

Answer 23

Substance

Question 24

It is a combination of two or more substances in which the substances retain their distinct identities.

Answer 24

Mixture

Question 25

the composition of the mixture is the same throughout.

Answer 25

Homogeneous mixture

Question 26

the composition is not uniform.

Answer 26

Heterogeneous mixture

Question 27

It can be measured and observed without changing the composition or identity of a substance.

Answer 27

Physical property

Question 28

in order to observe this property we must carry out a chemical change

Answer 28

Chemical property

Question 29

The measured value of _____ depends on how much matter is being considered.

Answer 29

Extensive property

Question 30

does not depend on how much matter is being considered

Answer 30

Intensive property

Question 31

It tells us how close a measurement is to the true value of the quantity that was measured.

Answer 31

Accuracy

Question 32

It refers to how closely two or more measurements of the same quantity agree with one another

Answer 32

Precision

Question 33

mass of the atom in atomic mass units

Answer 33

atomic mass

Question 34

a mass exactly equal to one-twelfth the mass of one carbon-12 atom

Answer 34

atomic mass unit

Question 35

the amount of a substance that contains as many elementary entities (atoms, molecules, or other particles) as there are atoms in exactly 12 grams (or 0.012 kilogram) of the carbon-12 isotope.

Answer 35

mole

Question 36

the mass (in grams or kilograms) of 1 mole of units (such as atoms or molecules) of a substance

Answer 36

molar mass

Question 37

the sum of the atomic masses (in amu) in the molecule.

Answer 37

molecular mass

Question 38

a gaseous sample is bombarded by a stream of high-energy electrons.

Answer 38

mass spectrometer

Question 39

first mass spectrometer was invented by

Answer 39

F.W. Aston

Question 40

percent by mass of each element in a compound.

Answer 40

percent composition by mass

Question 41

a process in which a substance (or substances) is changed into one or more new substances

Answer 41

chemical reaction

Question 42

a process in which a substance (or substances) is changed into one or more new substances.

Answer 42

chemical equation

Question 43

which are the starting materials in a chemical reaction

Answer 43

reactants

Question 44

the substance formed as a result of a chemical reaction

Answer 44

product

Question 45

the quantitative study of reactants and products in a chemical reaction.

Answer 45

stoichiometry

Question 46

the stoichiometric coefficients in a chemical equation can be interpreted as the number of moles of each substance

Answer 46

Mole method

Question 47

the proportions indicated by the balanced equation

Answer 47

stoichiometric amounts

Question 48

reactant used up first in a reaction

Answer 48

limiting reagent

Question 49

reactants present in quantities greater than necessary to react with the quantity of the limiting reagent

Answer 49

excess reagents

Question 50

the amount of product that would result if all the limiting reagent reacted

Answer 50

theoretical yield

Question 51

amount of product actually obtained from a reaction

Answer 51

actual yield