Matter 2 (Elements, Compounds And The Periodic Table

Question 1

Are elements pure?

Answer 1

Yes

Question 2

Carbon Dioxide is…

Answer 2

A compound and is pure

Question 3

True or false:

Chemicals make up everything.

Answer 3

True

Question 4

What is an element?

Answer 4

Elements are made up of only 1 type of atom.

Question 5

Immiscible means…

Answer 5

It doesn’t mix up.

Question 6

Miscible means…

Answer 6

It does mix up.

Question 7

How can distillation purify substances?

Answer 7

When you use distillation it separates out two or more substances, meaning that once they have been separated they are pure. The separation happens as different substances have different boiling points.

Question 8

What is a compound?

Answer 8

It is two or more elements chemically bonded together. They have different properties from the elements that they come from.

Question 9

Do compounds have the same properties as their elements?

Answer 9

No. For example table salt is a compound made from chlorine, a toxic gas, and sodium, a metal that catches fire when it touches water.

Question 10

What is a molecule?

Answer 10

A molecule is two or more atoms chemically joined together. These can be atoms of the same element (e.g. O2 for oxygen) or atoms of different elements (e.g. CO for carbon monoxide)

Question 11

What is a mixture?

Answer 11

Two or more substances that are mixed but not chemically joined. You can get mixtures of elements (e.g. if nitrogen and oxygen mix they don’t react), mixtures of compounds (carbon dioxide in water - fizzy ‘carbonated’ water), mixtures of molecules (both of the above are mixtures of molecules) and mixtures of combinations e.g. a mixture of oxygen (molecules of an element) and water (molecules of a compound)

Question 12

How can you separate two liquids in a mixture?

Answer 12

Use distillation - each liquid has a different boiling point so collecting each one at a specific temperature when it boils allows you to separate the vapours (gas form of the liquids) and condense them back into the pure liquid.

Question 13

What is a pure substance?

Answer 13

A pure substance is when the substance is only one type of particle (atoms or molecules).

Question 14

What is the difference between a mixture and a pure substance?

Answer 14

A pure substance is made up of only one type of particle (atoms or molecules) whereas mixtures have at least 2 types of particle not joined together.

Question 15

What are particles made of?

Answer 15

Atoms and Molecules

Question 16

True or false: a chemical formula shows all the elements present in their relative proportions?

Answer 16

True!

Question 17

Where are metals generally found on the periodic table?

Answer 17

On the left side generally.

Question 18

Where are non metals normally found on the periodic table?

Answer 18

On the right side generally.

Question 19

What is group 1?

Answer 19

The Alkali metals, they are reactive and react in water and oxygen. Oxygen - they are silver when they are cut, but then oxidise and become grey again.
Water - they fizz (produces a gas)

Question 20

What is group 7?

Answer 20

Group 7 are non metals called the halogens, they are non metals. (After the stairway)

Question 21

What is group 0?

Answer 21

Group 0 contains gases that are not reactive called the noble gases, they are not reactive because they have a full outer shell of electrons.

Question 22

What are properties of metals?

Answer 22

• Usually solids
• High melting points
• Electrical conductors
• Thermal conductors
• Shiny
• High density
• Strong
• Oxides are alkaline
• Malleable and ductile

Question 23

What are properties of non metals?

Answer 23

• Solids, liquids and gases
• low melting points
• Electrical insulators
• Are NOT thermal conductors
• Dull
• low density
• weak
• oxides are acidic
• not malleable and not ductile