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Science > Physical and Chemical Changes > Flashcards

Physical and Chemical Changes Flashcards

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1
Q

matter

A

Anything that has mass and takes up space

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2
Q

physical change

A

A change that alters the form of a substance, but does not change it to a new type of substance

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3
Q

evaporation

A

The process by which water is converted from its liquid form to its vapor form (gas), but does not require heat. (Sun converts water into gas).

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4
Q

condensation

A

The process by which gas is converted or changed to a liquid. For example, when warm air or gas gets cooler, it causes some of the air to condense into liquid water. (Cold glass of ice water on a sunny day or rain).

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5
Q

boiling

A

The process where a liquid is heated to a temperature in which the liquid bubbles and turns to gas.

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6
Q

freezing

A

The process which liquid turns into a solid when its temperature is lowered.

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7
Q

melting

A

The process in which a solid will melt into a liquid.

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8
Q

density

A

How much matter is compressed in an object. This property can affect the mass of an object.

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9
Q

chemical change

A

A change that results in forming one or more new substances.

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10
Q

physical property

A

A process of describing a substance or matter by only its physical traits (shape, size, hardness, color, odor density, melting point, boiling point). We can describe physical properties by using our 5 senses

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11
Q

chemical property

A

A process of describing a substance or matter by how it interacts with other substances.

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12
Q

corrosion

A

The chemical breakdown of metal, usually due to the action of oxygen (Example: rusting is a type of corrosion).

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13
Q

oxidation

A

The interaction between oxygen molecules (air) and all the different substances they may contact, from metal to living tissue.

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14
Q

volume

A

The amount of space a matter or substance takes up or occupies.

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15
Q

malleability

A

A quality that metals have. It’s the ability for a substance to be hammered or bent into a certain shape without breaking. (hammering gold into thin sheets or bending a paperclip).

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16
Q

solubility

A

A property that measures how much of a substance dissolves in a liquid. This is a physical property because the substance that is being dissolved can be brought back to its original form.

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17
Q

Law of Conservation of Mass

A

The matter can be changed from one form into another, mixtures can be separated or made, and pure substances can be decomposed, but the total amount of mass remains constant.

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18
Q

decomposition

A

The state or process of rotting.

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19
Q

compound

A

A substance made up of two or more different elements that have chemically combined.

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20
Q

change of state

A

The process when a substance changes from one state to another.

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21
Q

chemical reaction

A

A change in which one or more new substances are formed.

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22
Q

mixture

A

Two or more substances that are combined without being changed.

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23
Q

dissolve

A

The process of a substance breaking down and disappearing when mixed in a liquid.

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24
Q

texture

A

The physical appearance and feel of a substance.

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25
Q

solid

A

This is a state of matter where its atoms are tightly packed together. It can be described as hard or firm.

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26
Q

liquid

A

This state of matter has a constant volume but no fixed shape, so it can flow and take on the shape of its container.

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27
Q

gas

A

This state of matter can expand freely and fill every space of a container no matter how large or small it is.

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28
Q

True or False? The amount of space an object takes up is known as volume.

A

True

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29
Q

True or False? A physical change results in one or more new substances with different properties.

A

False

30
Q

True or False? Evaporation from boiling causes a change of state from a gas to a liquid.

A

False

31
Q

True or False? Decomposition is a type of reaction that breaks down a substance into two or more substances. An example is rotting.

A

True

32
Q

True or False? Toasting, roasting, and baking are all examples or clues of chemical change.

A

True

33
Q

Tearing, crumpling, folding, or cutting paper are all examples of what kind of change?

A

Physical Change

34
Q

A rule stating that in a chemical or physical change, mass is not created or destroyed; it only changes from one form to another.

A

Law of Conservation of Mass

35
Q

The change of a liquid into a solid is called what?

A

freezing

36
Q

The change of a solid into a liquid is called what?

A

melting

37
Q

Is frying an egg a chemical change? Explain.

A

Yes, the matter changed into a new substance and the egg won’t ever be raw again.

38
Q

Give an example of a chemical change.

A

glow sticks, burning wood, rust, baking bread, ripening tomatoes, etc.

39
Q

Give an example of a physical change.

A

cutting an orange, melting an ice cube, freezing water, cutting paper, etc.

40
Q

True or False? Matter is lost or a substance loses some of its matter during a chemical change.

A

False

41
Q

Is melting chocolate a physical change? Why or why not?

A

Yes. Melting chocolate is a physical change because it only changes state and it remains chocolate.

42
Q

This is a state of matter where its atoms are tightly packed together. It can be described as hard or firm.

A

solid

43
Q

This word explains how much matter is compressed in an object.

A

density

44
Q

The process when a substance changes from one state to another?

A

change of state

45
Q

If you describe a substance by its shape, size, texture, color, smell, volume, or density you are describing its what?

A

physical properties

46
Q

Chemical properties are properties that describe how a substance interacts with other substances. Give one example of a chemical property.

A

oxidation, ability to burn, reactivity, color, or odor

47
Q

Which change can be easily reversed?

A

physical change

48
Q

Burning a candle is showing both a physical and chemical change at the same time. Explain how.

A

Melting wax is chemical, burning candle wick is physical

49
Q

Milk turns sour is what type of change?

A

chemical change

50
Q

If the chemical properties of a substance remain unchanged and the appearance or shape of a substance changes it is called what?

A

physical change

51
Q

This state of matter has a constant volume but no fixed shape, so it can flow and take on the shape of its container.

A

liquid

52
Q

The formation of gas bubbles is a sign of what type of change?

A

chemical change

53
Q

The rusting of a bicycle is a physical or chemical property?

A

chemical property

54
Q

Bread rising is a physical or chemical change?

A

chemical change

55
Q

What is malleability?

A

It’s the ability for a substance, such as metals to be hammered or bent into a certain shape without breaking.

56
Q

Solubility is a physical or chemical property? Explain.

A

Physical property: Solubility is a property that measures how much of a substance dissolves in a liquid. This is a physical property because the substance that is being dissolved can be brought back to its original form.

57
Q

Mixing Kool-Aid powder in water is a physical or chemical change?

A

physical change

58
Q

Burning leaves or wooden logs is a physical or chemical change?

A

chemical change

59
Q

Freezing chocolate covered bananas is a physical or chemical change?

A

physical change

60
Q

Melting ice cream is a physical or chemical change?

A

physical change

61
Q

Iron and sulfur mix and form a partially magnetic black and yellow mixture. Is this a physical or chemical change?

A

chemical change

62
Q

Vinegar reacts by fizzing and forming bubbles when mixed with baking soda is a physical or chemical change?

A

chemical change

63
Q

Water boils at 100 degrees Celsius is a physical or chemical change?

A

physical change

64
Q

True or False? Color is a clue that could indicate a physical and chemical change.

A

True

65
Q

What type of change occurs when two solutions are mixed together and the new solution becomes hot?

A

chemical change

66
Q

True or False? Odor is a physical and chemical property.

A

True

67
Q

What is evaporation?

A

A change from liquid to gas.

68
Q

A physical blend of 2 or more substances, retaining their original compositions, that can be separated by physical means is called?

A

mixture

69
Q

A substance made up of two or more different elements that have chemically combined.

A

compound

70
Q

This state of matter can expand freely and fill every space of a container no matter how large or small it is.

A

gas

71
Q

Chewing an apple is a physical or chemical change?

A

physical change

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