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Science 8th Grade > Science Midterm > Flashcards

Science Midterm Flashcards

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1
Q

What is Persicion

A

How close together or how consistent your info is

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2
Q

What is accuracy

A

How correct your answer is

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3
Q

What is a measurement

A

Using equipment to find information

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4
Q

What is a Calculation

A

Using a mathematical formula to find information

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5
Q

What are the 3 different ways to measure volume?

A

LWH, Water displacement, set up an equation using density and mass

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6
Q

What is the Archimedes Principle

A

Water Displacement

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7
Q

What is the difference between Mass and weight

A

Mass is the amount of matter in something and Weight is the gravitational pull on an object

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8
Q

What substances are pure?

A

Elements, Compounds

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9
Q

What substances are not pure?

A

Mixtures

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10
Q

What substance(s) cannot be broken down

A

Elements

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11
Q

What substance(s) can be broken down/separated

A

Compounds: Broken Down
Mixtures: Seperated

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12
Q

What measurement is used when finding mass

A

(g) Grams

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13
Q

What is a heterogenous mixture?

A

Something you can tell is made up of multiple different things

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14
Q

What is a homogenous mixture?

A

Something consistent throughout

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15
Q

What are the signs of a chemical change?

A

Color Change
Temp Change (exo/endothermic)
A gas created
A solid created

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16
Q

What has unique properties

A

Elements, compounds (different than the things that makes up the compounds)

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17
Q

What is a physical property?

A

Something that describes how a material looks and feels

18
Q

What is a chemical property?

A

Something that describes how a material will react with other materials

19
Q

What is an element made up of?

A

MADE UP OF A SINGLE TYPE OF ATOM

20
Q

What is a compound made up of?

A

MADE OF TWO OR MORE SPECIFIC CHEMICALLY COMBINED ELEMENTS

21
Q

What is a mixture made up of

A

Made of 2 or more substances not chemically combined

22
Q

What is the difference between a molecule and a compound?

A

A molecule is a group of 2 or more atoms that can be the same and compounds have to be diffrent

23
Q

What is the difference between a property and a change?

A

Property describes something

24
Q

How do atoms in a solid move

A

Slowly - vibrating

25
Q

How do atoms in a liquid move

A

Semi-fast - moves past each other

26
Q

How do atoms in a gas move

A

Fast - bouncing off each other

27
Q

What is it called when a substance goes from a solid to a liquid

A

Melting

28
Q

What is it called when a substance goes from a liquid to a solid

A

Freezing

29
Q

What is it called when a solid becomes a gas

A

Sublimation

30
Q

What is it called when a substance goes from a gas to a solid

A

Desposition

31
Q

What is it called when a gas becomes a liquid

A

Condensation

32
Q

What is it called when a liquid becomes a gas

A

Evaporation

33
Q

What does it mean if something is polar?

A

Has a positive and a negative

34
Q

Why is water polar?

A

It has a positive and negative side

35
Q

What is the law of conservation of Mass?

A

Matter can not be lost or gained

36
Q

What is density?

A

The amount of matter packed into an object

37
Q

What is Cohesion?

A

An attraction between molecules of the same substance

38
Q

What is Adhesion?

A

An attraction between molecules of different substances

39
Q

What happens in a chemical reaction?

A
40
Q

What causes surface tension

A

Science 8th Grade (3 decks)

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