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Chemistry > Exam 1 > Flashcards

Exam 1 Flashcards

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1
Q

What is a pure substance? Can it be separated?

A

It’s a sinlge thing/matter cannot be separated

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2
Q

What is a mixture? Can it be separated?

A

It’s a combination of 2 or more substances of things and it can be separated

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3
Q

What is a heterogeneous mixture and its features?

A

Has visibly different features, can see the different substances in the mixture

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4
Q

What is homogenous mixture and it’s features?

A

Only has one visible distinct phase (looks all the same thing)

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5
Q

What is an element?

A

A pure substance that can not be broken down (one thing)

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6
Q

What is a compound?

A

Something made up of 2 or more elements and can be broken down

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7
Q

What is a diatomic molecule?

A

A molecule that contains 2 atoms

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8
Q

What is a triatomic molecule?

A

A molecule that contains 3 atoms

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9
Q

What is a homoatomic molecule?

A

A molecule that contains the exact same atoms

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10
Q

What is a heteroatomic molecule?

A

A molecule made up of 2 or more different atoms

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11
Q

LOOK AT CHAPTER 1 PRACTICE PROBLEMS AND DO THEM

A

ANSWER IN YOUR NOTES

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12
Q

What are some things that are not matter?

A

Heat, light, electricity

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13
Q

How do you define solid as a state of matter?

A

definite shape, definite volume

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14
Q

How do you define liquid as a state of matter?

A

no shape, shape of container

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15
Q

How do you define gas as a state of matter?

A

indefinite shape, indefinite volume

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16
Q

How do you know if it is a physical reaction or a chemical reaction?

A

Physical
Color ,Oder ,Physical state ,Its Chemical identity remains the same, Substance changes its physical appearance
But its chemical composition stays the same
No new substance is formed

Chemical
Undergoes or resists change to form a new substance, A new substance is formed

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17
Q

What element is this? H

A

Hydrogen

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18
Q

What element is this? He

A

Helium

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19
Q

What element is this? Li

A

Lithium

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20
Q

What element is this? Na

A

Sodium

21
Q

What element is this? K

A

Potassium

22
Q

What element is this? Be

A

Beryllium

23
Q

What element is this? Mg

A

Magnesium

24
Q

What element is this? Ca

A

Calcium

25
Q

What element is this? B

A

Boron

26
Q

What element is this? C

A

Carbon

27
Q

What element is this? N

A

Nitrogen

28
Q

What element is this? O

A

Oxygen

29
Q

What element is this? F

A

Fluorine

30
Q

What element is this? Ne

A

Neon

31
Q

What element is this? Al

A

Aluminum

32
Q

What element is this? P

A

Phosphorous

33
Q

What element is this? S

A

Sulfur

34
Q

What element is this? Cl

A

Chlorine

35
Q

What element is this? Br

A

Bromine

36
Q

What element is this? I

A

Iodine

37
Q

What element is this? Ni

A

Nickel

38
Q

What element is this? Cu

A

Copper

39
Q

What element is this? Zn

A

Zinc

40
Q

What element is this? Sn

A

Tin

41
Q

What element is this? Pb

A

lead

42
Q

What element is this? Au

A

Gold

43
Q

What element is this? Ag

A

Silver

44
Q

What are exact numbers?

A

ANY number that has no uncertainty with it

45
Q

What are some examples of defined numbers?

A

There are exactly 12 eggs in a dozen, things that DO NOT have to be measured

46
Q

What are inexact numbers?

A

ANY number that has a degree of uncertainty or has to be measured

47
Q

What are some examples of inexact numbers?

A

23.234, 0.0964, ANYTHING that needs a measuring tool

48
Q

How can you tell if a number is a significant figure or not?

A

ALL NONE zeros (98.765)
IF zeros are sandwiched in between two non zero numbers than they are significant figures (7.80097
Leading zeros ARE NOT significant figures (0.0099)
IF trailing zeros HAVE a decimal point then they are significant figures (985.000) BUT IF NOT then they are NOT significant figures (987,000)

49
Q

Density = WHAT?

A

Density = Mass/Volume

Chemistry (4 decks)

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