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All subjects > Science yr8- Physical & Chemical Change > Flashcards

Science yr8- Physical & Chemical Change Flashcards

1
Q

What is matter

A

Matter is anything that takes up space and can be weighed

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2
Q

What are the 3 states of matter

A

Solid, Liquid, Gas

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3
Q

Is a change in state a phyiscal or chemical change

A

Physical

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4
Q

How do you change the state of an object

A

Energy is added or removed

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5
Q

What is change (Scientific definition)

A

Change is the act of altering a substance

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6
Q

What is Chemical change

A

It’s a rearrangement of particles so that the product is different to the reactants

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7
Q

What DOESN’T a Physical change do

A

It doesn’t change the chemical composition or identity of the substance, only the form

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8
Q

What are 5 examples of a PHYSICAL change

A

-MELTING ice
-FREEZING cordial
-TEARING paper
-BOILING water
-MIXING a mixture (ex. sugar+water)

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9
Q

What DOES a chemical change do

A

It does change the chemical composition or identity of a substance and makes a new substance

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10
Q

What are 4 examples of a CHEMICAL change

A

-BURNING paper (COMBUSTION)
-ROTTING (DECOMPOSING)
-RUSTING
-TEMPERATURE CHANGE (Endothermic & Exothermic reactions)

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11
Q

What are reactants

A

They are the substances reacting with each other

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12
Q

What is the product

A

The thing being produced at the end of the reaction

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13
Q

What is the formula for a CHEMICAL change

A

Reactant + Reactant= Product

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14
Q

What is the rule about matter

A

It’s never created or destroyed in chemical reactions

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15
Q

What is an Endothermic reaction

A

The heat moves into the system from the surroundings, so the surroundings get colder.

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16
Q

What is an Exothermic reaction

A

The heat moves out of the system into the surroundings, so the surroundings get hotter.

17
Q

What are the 7 clues of chemical change

A
  1. Combustion (burning)
  2. Odour/smell
  3. Colour change (rusting)
  4. Irreversible
  5. Gas/bubbles
  6. Temperature change
  7. Light
18
Q

What must CHEMICAL changes have

A

It must have a total rearrangement of particles. (The product is different to the reactants)

19
Q

What is diffusion

A

The movement of particles, within a liquid or a gas, from an area of HIGH concentration, to an area of LOW concentration. Until the particles are evenly spread.

20
Q

Which states of matter could diffuse

A

-Solid particles can’t move, they’re fixed. So they COULDN’T diffuse
-Liquid and Gas particles move freely. So they COULD diffuse
-To get a solid to diffuse, you have to DISSOLVE it.

21
Q

What is the ‘Brownian Motion’

A

The RANDOM movement of a particle as a result of bumping into other liquid or gas particles. This movement always flows from high concentration to low concentration.

22
Q

What are the 4 factors affecting the diffusion rate

A
  1. Temperature
  2. Density
  3. Volume
  4. Pressure

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