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Chemistry GCSE > Introduction > Flashcards

Flashcards in Introduction Deck (15)
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1
Q

What are the four separation techniques?

A

Filtering, evaporation, distillation and chromatography

2
Q

What is a synthesis reaction?

A

When a compound is made from simple reactants. E.g. Magnesium + oxygen -> magnesium oxide

3
Q

What is a decomposition reaction?

A

When a compound breaks down into two or more products, e.g. Copper carbonate -> copper oxide +carbon dioxide

4
Q

What is an element?

A

Contains one type of atom containing the same amount of protons

5
Q

What is a compound?

A

Combination of two or more different elements in a FIXED proportion, joined by strong bond

6
Q

What is a molecule?

A

What is created when two or more non metals chemically bond

7
Q

What is a mixture?

A

When and elements and compounds are mixed together but aren’t chemically bonded

8
Q

How can mixtures be separated?

A

Physical means like heat and magnets

9
Q

List three ways to decompose a compound?

A

Electricity, heat and light

10
Q

How are the components in a mixture fixed?

A

They aren’t

11
Q

What does decomposition generally require?

A

A source of energy, for example electrolysis or thermal decomposition.

12
Q

Wha does corrosive mean?

A

These materials can give you blisters

13
Q

What does harmful mean?

A

These materials can kill living cells.

14
Q

What does toxic mean?

A

These materials can kill you.

15
Q

What does irritant mean?

A

These materials can make your skin itchy.