L1: Elements, Compounds & Mixtures Flashcards Preview

Chemistry (Semester 1) > L1: Elements, Compounds & Mixtures > Flashcards

Flashcards in L1: Elements, Compounds & Mixtures Deck (38):
1

"A property that changes when the size of the sample changes"

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

B) Extensive

2

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

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

A) Intensive

3

Extensive or intensive?

Electrical conductivity

Intensive

4

Extensive or intensive?

Temperature

Intensive

5

Extensive or intensive?

Hardness

Intensive

6

Extensive or intensive?

Mass

Extensive

7

Extensive or intensive?

Molecular weight

Intensive

8

Extensive or intensive?

Volume

Extensive

9

Extensive or intensive?

Density

Intensive

10

Extensive or intensive?

Colour

Intensive

11

Extensive or intensive?

Length

Extensive

12

Extensive or intensive?

Melting point

Intensive

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

D) Physical

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

C) Chemical

15

Physical or chemical?

Colour

Physical

16

Physical or chemical?

Molecular weight

Physical

17

Physical or chemical?

Reactivity

Chemical

18

Physical or chemical?

Flammability

Chemical

19

Physical or chemical?

Oxidation states

Chemical

20

Physical or chemical?

Volume

Chemical

21

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

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

A) Intensive

22

What is the term to describe "anything that has mass"?

Matter

23

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

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

C) Chemical

24

True or false: compounds are examples of pure substances

True

25

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

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

26

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

True

27

What particles are found in the nucleus of an atom?

Protons and neutrons

28

What is the formula for relative atomic mass?

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

29

What is the formula for relative molecular mass?

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

30

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

Add up the relative atomic masses of the constituent atoms

31

What is a homogenous mixture?

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

32

What is a heterogeneous mixture?

A mixture with varying properties and a non-uniform appearance

33

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

True

34

Give 6 methods of separating mixtures

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

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

B) a compound

36

A substance with non-uniform properties is:

A) an element
B) a compound
C) a heterogenous mixture
D) a homogenous mixture

C) a heterogenous mixture

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

A) an element

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

D) a homogenous mixture