L1: Elements, Compounds & Mixtures

Question 1

“A property that changes when the size of the sample changes”

A) Intensive
B) Extensive
C) Chemical
D) Physical

Answer 1

B) Extensive

Question 2

A property that doesn’t change when you add or take away from the sample

A) Intensive
B) Extensive
C) Chemical
D) Physical

Answer 2

A) Intensive

Question 3

Extensive or intensive?

Electrical conductivity

Answer 3

Intensive

Question 4

Extensive or intensive?

Temperature

Answer 4

Intensive

Question 5

Extensive or intensive?

Hardness

Answer 5

Intensive

Question 6

Extensive or intensive?

Mass

Answer 6

Extensive

Question 7

Extensive or intensive?

Molecular weight

Answer 7

Intensive

Question 8

Extensive or intensive?

Volume

Answer 8

Extensive

Question 9

Extensive or intensive?

Density

Answer 9

Intensive

Question 10

Extensive or intensive?

Colour

Answer 10

Intensive

Question 11

Extensive or intensive?

Length

Answer 11

Extensive

Question 12

Extensive or intensive?

Melting point

Answer 12

Intensive

Question 13

“A property that can be observed or measured without altering the chemical identity of the sample”

A) Intensive
B) Extensive
C) Chemical
D) Physical

Answer 13

D) Physical

Question 14

“A property that can only be observed or measured by altering the chemical identity of the sample”

A) Intensive
B) Extensive
C) Chemical
D) Physical

Answer 14

C) Chemical

Question 15

Physical or chemical?

Colour

Answer 15

Physical

Question 16

Physical or chemical?

Molecular weight

Answer 16

Physical

Question 17

Physical or chemical?

Reactivity

Answer 17

Chemical

Question 18

Physical or chemical?

Flammability

Answer 18

Chemical

Question 19

Physical or chemical?

Oxidation states

Answer 19

Chemical

Question 20

Physical or chemical?

Volume

Answer 20

Chemical

Question 21

Which of the following properties are most useful in chemical identification?

A) Intensive
B) Extensive
C) Chemical
D) Physical

Answer 21

A) Intensive

Question 22

What is the term to describe “anything that has mass”?

Answer 22

Matter

Question 23

Which type of property arises from the distribution of valence electrons?

A) Intensive
B) Extensive
C) Chemical
D) Physical

Answer 23

C) Chemical

Question 24

True or false: compounds are examples of pure substances

Answer 24

True

Question 25

What is Dalton's atomic theory? (4 points)

Answer 25

1) All matter is made of atoms. Atoms are indivisible and indestructible 2) All atoms of a given element are identical in mass and properties 3) Compounds are formed by a combination of two or more different kinds of atoms 4) A chemical reaction is a rearrangement of atoms

Question 26

True or false: valency and combining power are essentially the same thing?

Answer 26

True

Question 27

What particles are found in the nucleus of an atom?

Answer 27

Protons and neutrons

Question 28

What is the formula for relative atomic mass?

Answer 28

Ar = Mass of 1 atom of element / one-twelfth the mass of 1 carbon-12 atom

Question 29

What is the formula for relative molecular mass?

Answer 29

Mr = Mass of 1 molecule of substance / one-twelfth the mass of 1 carbon-12 atom

Question 30

How do you calculate the relative molecular mass of a known substance?

Answer 30

Add up the relative atomic masses of the constituent atoms

Question 31

What is a homogenous mixture?

Answer 31

A mixture with uniform appearance and properties (e.g. solution)

Question 32

What is a heterogeneous mixture?

Answer 32

A mixture with varying properties and a non-uniform appearance

Question 33

True or false: making a solution requires a solvent and a solute

Answer 33

True

Question 34

Give 6 methods of separating mixtures

Answer 34

1) Filtration 2) Crystallization 3) Extraction 4) Distillation 5) Magnetisation 6) Chromatography

Question 35

A substance that has uniform properties, a fixed composition, and is chemically decomposable is: A) an element B) a compound C) a heterogenous mixture D) a homogenous mixture

Answer 35

B) a compound

Question 36

A substance with non-uniform properties is: A) an element B) a compound C) a heterogenous mixture D) a homogenous mixture

Answer 36

C) a heterogenous mixture

Question 37

A substance with uniform properties, fixed composition, but is not chemically decomposable is: A) an element B) a compound C) a heterogenous mixture D) a homogenous mixture

Answer 37

A) an element

Question 38

A substance that has uniform properties, but not fixed composition is: A) an element B) a compound C) a heterogenous mixture D) a homogenous mixture

Answer 38

D) a homogenous mixture