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Year 8 Science > Physical And Chemical Changes > Flashcards

Physical And Chemical Changes Flashcards

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1
Q

What happens in a chemical change?

A

Chemical bonds are made or broken

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2
Q

What happens in a physical change?

A

Chemical bonds do not change

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3
Q

What is the transition between a solid and a liquid called?

A

Melting

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4
Q

What is the transition between a liquid and a gas called?

A

Evaporating

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5
Q

What is the transition between a liquid and a solid called?

A

Freezing

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6
Q

What is the transition between a gas and a liquid called?

A

Condensing

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7
Q

Is frying an egg a physical or chemical change?

A

Chemical

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8
Q

Is a bike rusting a physical or chemical change?

A

Chemical

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9
Q

Is food dye changing the colour of water a physical or chemical change?

A

Physical

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10
Q

Is digestion in the stomach by stomach liquids a physical or chemical change?

A

Chemical

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11
Q

Is melting ice cream a physical or chemical change?

A

Physical

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12
Q

Is fruit ripening a physical or chemical change?

A

Chemical

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13
Q

Is burning a match a physical or chemical change?

A

Chemical

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14
Q

Is fireworks exploding a physical or chemical change?

A

Chemical

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15
Q

Is dissolving sugar in water a physical or chemical change?

A

Physical

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16
Q

Are chemical changes usually reversible?

A

No

17
Q

Is a glass bottle smashing a physical or chemical change?

A

Physical

18
Q

Fill in the blanks: A __________ is a long molecule made up of many smaller identical molecules (called monomers) bonded together.

A

Polymer

19
Q

Fill in the blanks: Corrosion is a type of chemical reaction between a __________ and substances in its environment that results in the metal being ‘eaten away’. The most common form of corrosion that we encounter is the corrosion of iron, a process referred to as rusting. Over time, rusting can cause enormous damage to buildings, bridges, ships, railway tracks and cars.

When iron reacts with __________ and oxygen in the air it forms iron __________ and other iron compounds that make up the familiar red-brown substance known as rust.

Some substances in the environment make the rusting reaction happen much more quickly. One of the most effective of these is __________. Steel dinghies that are used in the ocean rust much faster than those that are used only in fresh water.

A

Metal
Water
Oxide
Salt

20
Q

Fill in the blanks: There are a number of factors that can be changed in order to alter the speed of a chemical reaction.

The following descriptions show how we can speed up a reaction:

The __________ is increased (this means the reactant particles will be moving around faster)

The __________ of a reactant is increased (this means that there will be more particles to react)

The __________ area is increased (this means a greater number of reactant particles are exposed)

A __________ is used (although this is not used up in the reaction it causes it to happen faster)

A

Temperature
Concentration
Surface
Catalyst

21
Q

Which of the following observations are good indicators that a chemical reaction may have occured?

A new substance is formed

The temperature of the substances changes spontaneously

A colour change occurs

Bubbles appear

A flame appears or light is produced

A precipitate forms

Substances mix together

A substance melts

A larger substance breaks down in to smaller ones

A

A new substance is formed

The temperature of the substances changes spontaneously

A colour change occurs

Bubbles appear

A flame appears or light is produced

A precipitate forms

Year 8 Science (6 decks)

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