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Science Book 8 > Chapter 8 > Flashcards

Chapter 8 Flashcards

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1
Q

What are chemical reactions

A

When reactants combine to form products

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2
Q

What are exothermic reactions

A

Reactions that release energy from chemicals to surrounding, increasing room temp

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3
Q

What is fuel

A

Substances that react with oxygen , they have stored chemical energy

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4
Q

What are fossil fuels

A

Formed from dead animals and plants that didn’t rot and have stored carbon

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5
Q

What are the 3 types of fossil fuels

A

Oil, coal and natural gas

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6
Q

What is burning/combustion

A

Chemical reactions where a substance reacts with oxygen

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7
Q

What 3 things are needed for combustion to occur

A

Fuel, heat, oxygen

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8
Q

What’s another word for spread

A

Dissipate

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9
Q

Write a word equation for burning magnesium

A

Magnesium + oxygen==> magnesium oxide

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10
Q

What is burning hydrogen used for

A

Fuel in model rockets

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11
Q

What energy does chemical energy turn into when fuel burns

A

Thermal and sound energy

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12
Q

What sound is made when carbon dioxide is produced?

A

Fizzing

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13
Q

What sound is made when hydrogen is produced

A

Pop sound

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14
Q

What is an example of an exothermic reaction with water

A

Potassium + water ==> potassium hydroxide + hydrogen

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15
Q

What is anither example of exothermic reaction with acid

A

Magnesium + hydrochloric acid==> magnesium chloride + hydrogen

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16
Q

What is endothermic reaction

A

Chemical reactions where thermal energy from surrounding is transferred to chemical energy stiredij chemical bonds

17
Q

What is an example of an exothermic reaction

A

Sodium hydroxide + citric acid==> sodium citrate + water + carbon dioxide

18
Q

What’s a snack that contains an endothermic reaction

A

Sherbet lemons

19
Q

Waht makes endothermic process different from reaction

A
  1. No product
  2. No Chemical reaction
20
Q

An example of an endothermic process

A

Potassium chloride+ water

21
Q

How is ice melting an endothermic process

A

Chemical energy stored in chemical bonds make particles vibrate more, overcoming the force and changing to liquid state

22
Q

What are 2 daily uses of endothermic reaction/ processes

A
  1. Self heating cans(reaction)
  2. Ice packs(proccess)
23
Q

What word equation is present in self heating cans

A

Calcium oxide + water==> calcium hydroxide

24
Q

What 2 types of ice packs are there

A
  1. Ammonia nitrate + water
  2. Ice and water

Science Book 8 (6 decks)

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