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Flashcards in Chemistry Deck (16)
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1

What are elements?

Pure substances made from only one atom

2

What are compounds?

Two or more elements chemically joined together

3

What is a substance made from different types of atoms that are not chemically joined together?

Mixture

4

What is a substance with one type of atomt called?

Element

5

What is a a substance with with two or more elements chemically joined together called?

Compound

6

What is an alloy?

An alloy is a mixture of two or more elements, one of which is always a metal

7

What are the four sings of a chemical reaction?

Colour change
Energy Change
Gas given off
Precipitate forms

8

What is a chemical reaction?

A chemical reaction is a change, which forms new substance(s)

9

What is a physical change?

In a physical change appearance or form changes, but no new substances are made. Many physical changes can be easily reversed

10

What is a chemical reaction?

A chemical equation tells you which substance we started with (the reactants) and the new substance(s) that were made in the reaction (the product)

11

To prepare cobalt copper, we can add cobalt chloride to potassium carbonate. Potassium chloride would also be produced. Write the equation.

Cobalt chloride = Potassium Carbonate ---> Potassium Chloride + Cobalt Carbonate

12

Sulfuric acid ----> ? salt

Sulfate

13

Nitric acid ----> ? salt

Nitrate

14

Hydrchloric acid ----> ? salt

Chloride

15

What metals are used in jewellery and why?

Platinum, gold and silver because it is less reactive

16

What is combustion?

The scientific name for burning