Chaper 2-Chemistry

Question 0

What are properties of non-metals?

Answer 0

• Cannot be polished-usually dull or glassy
• brittle
• poor conductors of electricity+heat
• melt at low temperatures
• many are gasses at room temp

Question 1

What are the properties of metals?

Answer 1

• solid at room temperature (except mercury-liquid)
• can be polished to produce high shine or lustre
• good conductors of electricity+heat
• can be beaten or bent into various shapes-malleable
• can be made into wire-ductile
• usually melts at high temperatures (except mercury-melts -44 degrees)

.

Question 2

What are metaloids?

Answer 2

Elements which have features of both metals and non-metals

Question 3

How many metalloids are there? Name them.

Answer 3

8. Silicon, arsenic, boron, germanium, antimony, pollonium, astatine and tellurium.

Question 4

What are protons?

Answer 4

Positively charged particles found in the centre of an atom. The number of protons is equal to the number of electrons.

Question 5

What are neutrons?

Answer 5

Particles found in the centre of an atom with no charge.

Question 6

What are electrons?

Answer 6

Negatively charged particles arranged in shells that move rapidly around the nucleus of an atom.

Question 7

What are compounds?

Answer 7

Substances where the atoms of one element are (tightly) chemically bound to the atoms of another element/s.

Question 8

Can the elements within a compound be easily separated?

Answer 8

No.

Question 9

Are compounds similar to the elements from which they were made?

Answer 9

No. Compounds are very different from the elements from which they were made

Question 10

What are elements?

Answer 10

Substances with only one kind of atom. They cannot be broken down into any other substances.

Question 11

What are mixtures?

Answer 11

Substances made up of two or more elements, two or more compounds or of elements and compounds.

Question 12

Can substances within a mixture be easily separated?

Answer 12

Yes.

Question 13

Are any new substances formed when a mixture is separated?

Answer 13

No.

Question 14

How can elements be separated from compounds?

Answer 14

By:

• passing electricity through the compound
• burning
• mixing chemicals together

Question 15

How does respiration allow carbon atoms in the bodies of living things return to the air?

Answer 15

Living thing release energy from glucose and produce carbon dioxide. The carbon dioxide released is taken by your blood to your lungs. It is returned to the atmosphere through respiration.

Question 16

How does decomposition allow carbon atoms in the body return to the air?

Answer 16

Decomposers absorb some of the substances in the dead material and release carbon dioxide into the atmosphere by respiration.

Question 17

How does burning allow carbon atoms in the bodies of living things return to the air?

Answer 17

Substances containing carbon react with oxygen and carbon dioxide is released.

Question 18

How does carbon atoms in living things get returned to the air?

Answer 18

Carbon dioxide is absorbed by living things. Living things turn the carbon into glucose. Other living things eat the glucose and they then return the carbon to the atmosphere through respiration.