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Spring Chemistry > January to March test > Flashcards

January to March test Flashcards

1
Q

What is physical change?

A

No new substances formed
Usually involves appearance change or change of state
Reversible

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2
Q

What can cause physical change?

A

Physical changes include transitions from one state to another, such as from solid to liquid or liquid to gas. Cutting, bending, dissolving, freezing, boiling, sublimation and melting are some of the processes that create physical changes.

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3
Q

What is chemical change?

A

One or more new substances formed
Usually involves apperance change
Detectable energy change

Two or more substances (the reactants) react together forming one or more new substances.

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4
Q

Is this experiment reversible?
Test tube- spatula of white copper sulfate powder+water
The solution became warm and change blue in colour

A

Yes this is a physical cahnge- can be reversed if thw solution is heated

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5
Q

Experiment- is this reversible?
Test tube with copper sulfate and then add iron wool. The solution becomes clear

A

No , chemical change, not reversible
copper sulphate + iron= copper and iron sulfate

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6
Q

metal + acid=?

A

salt and hydrogen

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7
Q

Magnesium + hydrochloric acid=

A

Magnesium chloride and hydrogen

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8
Q

zinc +sulfuric acid=

A

zinc sulfate + hydrogen

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9
Q

Reactivity series
Metals above hydrogen in the reactivity series will react with acids to make? what

A

a salt and hydrogen

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10
Q

Metals below hydrogen in the reactivity series do what?

A

DON’T react with acids. The reaction becomes less and less exciting as you go down the series

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11
Q

What is conservation of mass?

A

In chemical reactions, the total mass of reactants is equal to the total mass of products. No atoms are made or destroyed

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12
Q

Li

A

Lithium

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13
Q

What are Exothermic reactions?

A

An Exothermic reaction is one which GIVES OUT ENERGY to the surroundings- usually heat

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14
Q

Examples of exothermic reactions

A

Combustion
Neutralisation
Burning match
Magnesium and acid

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15
Q

What are endothermic reactions?

A

It is a reaction that TAKES IN ENERGY from the surroundings

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16
Q

Examples of endothermic reactions

A

Thermal decomposition
Photosynthesis

17
Q

What are fuels?

A

Granola- energy for humans
Coal-fuel that provides light and thermal energy

18
Q

What is needed for a fire?
Fire triangle

A

Heat
Fuel
Oxygen

19
Q

What does the top number 7 mean and what does the bottom number mean

A
20
Q

Fire triangle

A

Heat, Fuel, oxygen

21
Q

Word equation for combustion

A

fuel+oxygen+heat= water + carbon dioxide and heat

22
Q

Fire triangle

A
23
Q

How to test for C02?

A

limewater reacts with carbon dioxide and turns cloudy

24
Q

How to test for water?

A

cobalt chloride paper turns blue to pink

25
Q

What is thermal decomposition?

A

Thermal decomposition is when a compound breaks down into 2 or more simple substances when heated

26
Q

what happens in this example of thermal decomposition?

copper carbonate = ? what

A

copper oxide and carbon dioxide

CuCO3(s) = CuO (s)+ CO2

what does the s mean?(the substance is a solid)

27
Q

thermal decomposition of metal carbonates

metal carbonate–>

A

metal oxide and carbon dioxide

28
Q

Another exaple of thermal decomposition

silver nitrate–>

A

silver + nitrogen dioxide + oxygen

29
Q

Balance this example of thermal decomposition
AgNO3—-> Ag + NO2 +O2

A

2AgNO3–> 2Ag + 2NO2 + O2

draw a particle diagram of the above on a piece of paper

30
Q

what is a Precipitation reaction

A

These are chemical reactions where two solutions reacts together to form an insoluble product.
It starts clear and ends as a cloudy mixture.

31
Q
A

a) Silver bromide (s) + Sodium Nitrate
b) Copper Hydroxide (s) + Sodium Nitrate
c) Silver Iodide (s) + Potassium Nitrate
d) Barium Sulphate (s) + Sodium Chloride

Spring Chemistry (4 decks)

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