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Science Sec 3 > Chemical & Physical changes > Flashcards

Chemical & Physical changes Flashcards

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1
Q

Physical and Chemical changes occur because of which interactions?

A

Matter & electricity
Matter & light
Matter & heat
Mixing

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2
Q

What is an exothermic reaction?

A

Reaction that gives out heat

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3
Q

What are examples of chemical changes in exothermic reactions?

A

Oxidation
Rusting
Corrosion

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4
Q

What are examples physical changes in Exothermic reactions?

A

Condensation

Freezing

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5
Q

What is an Endothermic Reaction?

A

Reaction that absorbs heat from surroundings

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6
Q

What are examples of chemical changes in Endothermic reaction?

A

Photosynthesis

Photography

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7
Q

What are examples of physical changes in Endothermic reaction?

A

Evaporation

Melting

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8
Q

What are reactions that involve interactions between matter and heat?

A

Oxidation
Combustion
Thermal Decomposition

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9
Q

Is respiration an example of oxidation?

A

Yes, as you respire, oxygen reacts with glucose to produce Carbon dioxide, water and energy

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10
Q

What are the chemical reactions that involve matter and light?

A

Photography

Photosynthesis

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11
Q

What are chemical reactions that involve matter and electricity?

A

Electrosis

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12
Q

What are the processes called inelectrosis?

A

Electropltiny

Refining of metals

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13
Q

What are the 3 reactions for mixing?

A

metal + acid = hydrogen + salt
Carbonate + acid = carbon dioxide + salt + water
acid + alkali = salt + water

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14
Q

What substance has PH level of 7?

A

Distilled water

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15
Q

When calcium carbonate mix with hydrochloric acid, what is produced?

A

carbon dioxide + calcium chloride

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16
Q

How do you test if carbon dioxide is produced?

A

Add limewater, if the limewater turns chalky, then there is presence of carbon dioxide

17
Q

What are examples of neutralization?

A

Sodium hydroxide + sodium hydochloride

18
Q

What is a source for sulphur dioxide?

A

Acid rain

Burning of fuel

19
Q

What are chemical reactions that bring harm to our environment?

A

Rusting
Burning
Food Decay

20
Q

What are examples of indicators?

A

Universal indicator

red and blue litmus paper

21
Q

What turns Blue litmus red?

A

acid

22
Q

What happens to the blue litmus paper when it comes into contact with sodium hydroxide?

A

It will remain blue

23
Q

What PH value does green represent

A

neutral (7)

24
Q

Are acid and alkaline conductors of electricity?

A

Yes

25
Q

What are examples of acid?

A

Hydochloride acid
Sodium Chloride
Calcium Chloride

26
Q

What are examples of alkali?

A

Sodium hydroxide
Calcium hydroxide
Magnesium hydroxide

27
Q

The number of reactant atoms equivalent to the number of atoms of products because?

A

Extra atoms cannot be created or destroyed in chemical reactions

28
Q

What are benefits of chemical reactions in nature?

A

Photosynthesis
Respiration
Food Decay

29
Q

What are the benefits of chemical reactions in farming?

A

Food decay

Pesticide

30
Q

What are the benefits of chemical reactions in Hygiene?

A

Shampoo

air conditioner

31
Q

What are the benefits of chemical reactions in Healthcare?

A

Antacids which neutralise hydrochloride acid

32
Q

What are the benefits of chemical reactions in Cooking`?

A

Combustion which provide heat to cook food

33
Q

What are the benefits of chemical reactions in Manufacturing?

A

Raw materials can be changed into useful products, for example manufacture of plastic, paint

Science Sec 3 (2 decks)

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