chem definitions

Question 1

matter

Answer 1

anything that has mass and takes up space

Question 2

chemistry

Answer 2

the study of matter and the changes it undergoes

Question 3

pure substance

Answer 3

a type of matter that consists of only one type of particle

Question 4

mechanical mixture

Answer 4

a mixture in which the substances in it are distinguishable from each other, either with the unaided eye or with a microscope

Question 5

solution

Answer 5

looks like a pure substance but it contains more than one type of particle. You cannot visually distinguish between the different types of particles in a solution

Question 6

alloy

Answer 6

Two or more metals mixed together. an alloy is an example of a solution

Question 7

lustre

Answer 7

shininess or dullness

Question 8

optical clarity

Answer 8

the ability to allow light through.

Question 9

brittleness

Answer 9

break-ability or flexibility

Question 10

malleability

Answer 10

the ability of a substance to be hammered into a thinner sheet

Question 11

ductility

Answer 11

the ability of a substance to be drawn into finer strands

Question 12

solubility

Answer 12

the maximum quantity of a substance that can be dissolved in a given amount of solvent at a particular temperature and pressure

Question 13

hardness

Answer 13

refers to the substance’s ability to be scratched

Question 14

conductivity

Answer 14

the ability of a substance to conduct electricity and heat

Question 15

physical change

Answer 15

when the composition of the substance remains unaltered and no new substances are produced

Question 16

chemical property

Answer 16

a property of a substance that describes its ability to produce one or two more new substances

Question 17

chemical change

Answer 17

always accompanied by a change in the starting substance or substances and the production of one or more new substances

Question 18

combustibility

Answer 18

the ability of a substance to burn in air when exposed to a flame

Question 19

flammable

Answer 19

the ability of a substance to burn when exposed to a flame

Question 20

reaction with acid

Answer 20

describes the ability of a substance to react with an acid

Question 21

light sensitive

Answer 21

substances that become new substances when exposed to light

Question 22

a characteristic physical property

Answer 22

a physical property that is unique to a substance and that can be used to identify the substance

Question 23

density definition 2

Answer 23

a measure of how much mass is contained in a given unit volume of a substance

Question 24

the freezing point

Answer 24

the temperature at which a substance turns from a liquid into a solid; vise versa for the melting point of a substance

Question 25

the melting point

Answer 25

the temperature at which the substance turns from a solid into a liquid.

Question 26

an element

Answer 26

a pure substance that cannot be broken down into a simpler chemical substance by any physical or chemical means

Question 27

an element symbol

Answer 27

an abbreviation for a chemical element

Question 28

compound

Answer 28

a pure substance composed of two or more different elements that are chemically joined and in fixed proportions.