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Science exam Flashcards

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1
Q

The substances at the end of a chemical reaction are:

A

Products

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2
Q

The word equation for rust is:

A

Iron + water + oxygen

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3
Q

What is a chemical change?

A

A chemical change cannot be reversed, the bonds between atoms or molecules are altered to create a new substance

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4
Q

What is a physical change?

A

A physical change can be reversed

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5
Q

List four types of physical change

A
  1. Shape
  2. Colour
  3. Odour
  4. Feeling
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6
Q

Example of a physical change

A

Ice cream melting

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7
Q

Example of a chemical change

A

Hydrogen and oxygen mixing to form water

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8
Q

List two ways of protecting iron against rust:

A
  1. Galvanising

2. Prevent oxygen or moisture from contacting the metal

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9
Q

List three ways of speeding up a chemical reaction

A
  1. Increase surface area
  2. Increase the amount of reactant
  3. Increase the concentration
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10
Q

List four observations that provide evidence of a chemical change

A
  1. Colour change
  2. Precipitation
  3. Temperature change
  4. Light is emitted/ flames are seen
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11
Q

What is galvanising?

A

Galvanising is to coat a metal in a layer of zinc.

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12
Q

The word atom comes from the Greek word:

A

Atomos, meaning that which cannot be divided

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13
Q

An element is a substance that:

A

Cannot be broken down into other substances

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14
Q

The period an atom belongs to is also the number of:

A

Electron shells an atom has

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15
Q

What is a compound?

A

A compound is a substance that is a combination of two or more elements

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16
Q

Sea water is an example of:

A

A mixture

17
Q

What is a metalloid?

A

A metalloid has features of both metals and non- metals

18
Q

What are the features of metal?

A 
The features of metal are:
They are solid at room temp
They can be polished to be shiny
They are good electricity and heat conductors
They are malleable
They can be made into a wire
They usually melt at high temperatures
19
Q

What are the features of non-metals?

A 
They cannot be polished to look shiny
They are brittle
They cannot be bent into a shape
Usually poor conductors of heat
Melt at low temperatures
20
Q

How many non- metals are there?

A

22

21
Q

What are the eight metalloids?

A 
Boron
Silicon
Arsenic
Germanium
Antimony
Polonium
Astatine
Tellurium
22
Q

What is a mixture?

A

Mixtures can be made up of two or more elements, two or more compounds or a combination of them both.

23
Q

How do you find the mass number

A

It is the sum of the protons and neutrons

24
Q

How do you find the number of neutrons?

A

Mass number - atomic number = number of neutrons

25
Q

What are the features of a solid ?

A

Solids have a definite shape
They take up a fixed amount of space
Can’t be compressed
Cannot be poured

26
Q

What are the features of liquids?

A

Takes up the space of the container it is in
Take up a fixed amount of space
It flows
Cannot be compressed

27
Q

What are the features of gases?

A

Gases spread out
Will not stay in a container without a lid
Gases take up all available space (diffusion)
Can be compressed

28
Q

What are fluids?

A

Fluids are all liquids and gases as they can flow or spread

29
Q

What is the change from liquid to gas known as?

A

Evaporation

30
Q

What is the change from solid to liquid know as?

A

Melting

31
Q

What is the change from gas to liquid known as?

A

Condensation

32
Q

What is the change from liquid to solid know as?

A

Freezing

33
Q

What is the change from solids to gases know as?

A

Sublimation

34
Q

What happens to particles when the temperature increases?

A

The particles move faster

35
Q

Clouds are formed when:

A

Water evaporates

36
Q

What is the core body temperature of a healthy human?

A

37 degrees Celsius

37
Q

The substances at the beginning of a reaction are:

A

Reactants

Science (9 decks)

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