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Year 8 Science > Chemicals > Flashcards

Chemicals Flashcards

1
Q

How do we know a chemical reaction has taken place?

A

Colour change, Smell, Temperature change, Looks different,Noise

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2
Q

What are the types of Physical Changes?

A

Change of State, Dissolving

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3
Q

What are the qualities of a Physical Change?

A

No new substances are made, the change is reversible

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4
Q

What are the qualities of a Chemical Change?

A

Atoms are rearranged, New substance is made, Irreversible

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5
Q

What are the signs of a Chemical Change?

A

Flames on spark, Temperature Change, Noise, Smell

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6
Q

What is the first rule applied when naming a chemical?

A

The name of the metal goes first and the non-metal name ends with __ide.

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7
Q

What is the second rule when naming a chemical?

A

When three or more elements combine and one of them is oxygen the ending is __ate

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8
Q

What is the third rule when naming a chemical?

A

If 2 identical elements join together, the name doesn’t change.

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9
Q

What are elements that go in pairs called?

A

Diatomic molecules

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10
Q

What is Conservation of Mass?

A

The mass of a substance does not change during a chemical reaction as no particles are lost.
Reactants = Products

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11
Q

What is thermal decomposition?

A

A thermal decomposition reaction is when the chemical breaks done, using heat, into different chemicals

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12
Q

What is the sign of a thermal decomposition reaction?

A

There is only one reactant in the chemical equation

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13
Q

What are Exothermic reactions?

A

Exothermic reactions give energy out. The surroundings heat up.

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14
Q

What are Endothermic reactions?

A

Endothermic reactions take energy in. The surroundings cool down.

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15
Q

What is an oxidation reaction?

A

When a substance gains oxygen (atoms)

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16
Q

What are the reactants?

A

The reactants are the starting substance and are on the left side of the equation.

17
Q

What are the products?

A

The products are the new substance made and are on the right side of the equation.

18
Q

What is the rule when you are balancing the equation?

A

When balancing an equation, you can only place the number infront of the chemical! E.g 2Mg and not Mg2

19
Q

What are the 3 different states of matter?

A

Solid, Liquid, Gas

20
Q

What is an element?

A

An element is a substance with only one type of atom.

21
Q

What is a compound?

A

A compound is a substance with 2 or more types of atoms which are chemically joined togteher.

22
Q

What is a molecule?

A

A molecule is a substance which has 2 or more same types of atoms chemically joined together

23
Q

What is a combustion reaction?

A

A combustion reaction is when a fuel reacts with oxygen to produce carbon dioxide and water.

24
Q

What is a chemical reaction?

A

A chemical reaction is a process where atoms are rearranged to make new substances with the atoms joined together in different ways.

Year 8 Science (5 decks)

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