Chapter 20-Elements, Compounds And Mixtures Flashcards Preview

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Flashcards in Chapter 20-Elements, Compounds And Mixtures Deck (10)
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1

Elements

Substances made up of the same atoms

2

Molecule

Two atoms chemically combined

3

Compounds

Two/ more elements chemically combined eg. The salt NaCl

4

Properties of compounds

-single substance
-elements always in a fixed ratio
-difficult to seperate
-heat change usually neccesary
-loose individual properties

5

Matter

Anything that occupies space and has mass
Three states - solids, liquids and gasses

6

Properties of mixtures

-two/more substances
-amounts vary
-usually easy to seperate
-very little heat involved
-dont loose their own individual properties

7

Describe the difference between a mixture of iron and suflur and Iron Sulfide (FeS)

Mixture
-out magnet to iron fillings and they'll come right out :)

Compound FeS
-put the mixture into a test tube and heat till it stops glowing red
-when it turns grey it is iron Sulfide (FeS)
-a magnet can no longer seperate them

8

Compound vs. Element difference in Table salt

-NaCl
-sodium -very reactive metal
-chlorine-poisonous gas

9

Compound vs element difference in Co2 in fire extinguishers

Co2 puts out fire

-carbon- black solid
-oxygen-needed to burn fuel

10

Water
Compound vs mixture difference

H20
H=hydrogen -explosive gas
O= Oxygen- needed to burn fuel