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Science > Chemistry Revision > Flashcards

Chemistry Revision Flashcards

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1
Q

What are the signs of a chemical change

A

Colour change
Odour
Change in temperature
Evolution of gas (formation of bubbles)
Precipitate (formation of a solid)

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2
Q

What is the law of conservation of mass

A

Matter can not be created nor destroyed

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3
Q

What is an endothermic reaction

A

Reaction that absorbs heat from surrounding

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4
Q

Exothermic

A

Reaction that releases heat

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5
Q

What causes endothermic reactions

A

More energy stored in the product

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6
Q

What causes exothermic reaction

A

More energy stored in the bonds

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7
Q

Name types of energy

A

Heat
Kinetic
Light
Potential

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8
Q

What is the law of conservation of energy

A

Energy can not be created or destroyed only transferee from one type to another

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9
Q

What is energy efficiency

A

A measure of how much input energy is converted into useful output

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10
Q

How to calculate energy efficiency

A

Useful energy over energy input times 100

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11
Q

Name some renewable energy sources

A

Hydro
Solar
Wind

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12
Q

What are the Benefits of renewable energy

A

Cleaner enviorment
Less carbon emissions
Uses less water

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13
Q

Cons of renewable energy

A

Not always reliable

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14
Q

What is electricity

A

Electricity is a phenomenon involved with moving or stationary electric charges

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15
Q

What subatomic particles are in electricity

A

Electron

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16
Q

What is ac

A

Alternating currents. This is where electricity flows in both directions

17
Q

What is DC

A

Direct current. This is where electricity flows in one direction

18
Q

What is ohms law

A

That voltage(V) equals current(I) times resistance(R)

19
Q

What is ohms law used for

A

To calculate the relationship between voltage,current and resistance in a circuit

20
Q

What is a series circuit

A

A circuit that has 1 pathway that flows through 1 or more resistors

21
Q

What is a parallel Circuit

A

A parallel circuit is a circuit that has to pathways so that the current divides. Voltage across the circuit is the same

22
Q

Why do we use parallel circuits

A

it allows you to use switches and not affect the flow of electricity in other pathways

23
Q

Why do we use series circuits

A

It allows us to turn one or more loads at the same time

24
Q

What is a covalent bond

A

The sharing of electrons for stability in an atom

25
Q

What are ionic bonds

A

Ionic bonds are caused by an atom receiving or giving away an atom. This causes an electrostatic charge that pulls them together

26
Q

What is corrosion

A

Corrosion is the combining of metals and oxygen to form a metal oxide

27
Q

Common example of corrosion

A

Rusting of iron

28
Q

What is combustion

A

Combustion is any reaction that burns oxygen gas to produce light and heat. They are also always exothermic

29
Q

What are the stages of meiosis

A

Prophase, metaphase, anaphase and telophase

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