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

L1: Elements, Compounds & Mixtures Flashcards

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1
Q

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

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

A

B) Extensive

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2
Q

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

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

A

A) Intensive

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3
Q

Extensive or intensive?

Electrical conductivity

A

Intensive

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4
Q

Extensive or intensive?

Temperature

A

Intensive

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5
Q

Extensive or intensive?

Hardness

A

Intensive

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6
Q

Extensive or intensive?

Mass

A

Extensive

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7
Q

Extensive or intensive?

Molecular weight

A

Intensive

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8
Q

Extensive or intensive?

Volume

A

Extensive

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9
Q

Extensive or intensive?

Density

A

Intensive

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10
Q

Extensive or intensive?

Colour

A

Intensive

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11
Q

Extensive or intensive?

Length

A

Extensive

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12
Q

Extensive or intensive?

Melting point

A

Intensive

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13
Q

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

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

A

D) Physical

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14
Q

“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

A

C) Chemical

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15
Q

Physical or chemical?

Colour

A

Physical

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16
Q

Physical or chemical?

Molecular weight

A

Physical

17
Q

Physical or chemical?

Reactivity

A

Chemical

18
Q

Physical or chemical?

Flammability

A

Chemical

19
Q

Physical or chemical?

Oxidation states

A

Chemical

20
Q

Physical or chemical?

Volume

A

Chemical

21
Q

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

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

A

A) Intensive

22
Q

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

A

Matter

23
Q

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

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

A

C) Chemical

24
Q

True or false: compounds are examples of pure substances

A

True

25
Q

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

A

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
Q

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

A

True

27
Q

What particles are found in the nucleus of an atom?

A

Protons and neutrons

28
Q

What is the formula for relative atomic mass?

A

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

29
Q

What is the formula for relative molecular mass?

A

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

30
Q

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

A

Add up the relative atomic masses of the constituent atoms

31
Q

What is a homogenous mixture?

A

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

32
Q

What is a heterogeneous mixture?

A

A mixture with varying properties and a non-uniform appearance

33
Q

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

A

True

34
Q

Give 6 methods of separating mixtures

A

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

35
Q

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

A

B) a compound

36
Q

A substance with non-uniform properties is:

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

A

C) a heterogenous mixture

37
Q

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

A) an element

38
Q

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

A

D) a homogenous mixture

Chemistry (Semester 1) (10 decks)

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