Chemistry Video 1

Question 1

Element

Answer 1

Only one type of atom

Question 2

Compound

Answer 2

Two or more types of atoms of different elements chemically bonded to form a single molecule

Question 3

Pure substance

Answer 3

Can be an element or compound

Question 4

Mixture

Answer 4

Two or more pure substances mixed together. Can be homogenous or heterogeneous

Question 5

Homogeneous mixture

Answer 5

Components are distributed evenly (ex. sugar in water will disperse evenly). AKA a solution

Question 6

Heterogeneous mixture

Answer 6

Components are not distributed evenly (ex. oil in water forms distinct layer)

Question 7

Physical change

Answer 7

Matter changes form but the identity of the substance does not change (ex. solid, liquid, gas)

Question 8

Chemical change

Answer 8

Identity of the substance changes due to chemical reaction. Can be used to separate a pure substance into smaller components or individual elements. Break chemical bonds

Question 9

Physical property

Answer 9

Quality that a substance exhibits without having to undergo a chemical change (ex. melting point, boiling point, density, colour). Can be used to separate mixtures, but cannot separate pure substances.

Question 10

Electrolysis

Answer 10

Split H2O to O2 and H2. Chemical change. O-H bonds break and H-H and O-O bonds form

Question 11

Chemical property

Answer 11

Describes the kinds of chemistry a substance will or won’t do (ex. flammability, toxicity, likelihood of a metal to rust (metal atoms bond with oxygen atoms))

Question 12

Extensive properties

Answer 12

Characteristics that a sample exhibits that depend on the amount of matter present (ex. volume, length, mass, amount of heat)

Question 13

Intensive properties

Answer 13

Characteristics that a sample exhibits that do not depend on the amount of matter present (ex. colour, density, pressure)