Liquids, solids, gases

Question 1

what do you call the change of state from solid to liquid?

Answer 1

melting

Question 2

what do you call the change of state from liquid to gas?

Answer 2

evaporation

Question 3

what do you call the change of state from solid to gas?

Answer 3

subliming

Question 4

what do you call the change of state from gas to liquid?

Answer 4

condensation

Question 5

what do you call the change of state from liquid to solid?

Answer 5

freezing

Question 6

What happens to a solid when it’s heated?

Answer 6

Solids vibrate their particles around the same area when they are heated. Their particles don’t freely move.The solid slightly expands

Question 7

What happens to a liquid when it’s heated?

Answer 7

Liquid particles move around more when they get heated but they stay roughly in the same area. The liquid expands

Question 8

What are elements?

Answer 8

elements are substances who only contain one type of atom

Question 9

What are examples of elements?

Answer 9

He,Li,Ba,Na

Question 10

What are compounds?

Answer 10

Compounds are substances composed of 2 or more elements chemically bonded together.

Question 11

What are examples of compounds?

Answer 11

MgO , NaCl

Question 12

what are mixtures?

Answer 12

mixtures are 2 or more elements mixed together that are not chemically bonded together but are found in the same region. e.g: skittles

Question 13

what are different ways of seperating a mixture?

Answer 13

1)filtration 2)Crystallisation 3)Chromatography 4)distillation

Question 14

What is a pure substance?

Answer 14

It is a substance made out of a single element or compound. It is important to not that every pure substance has a specific melting point/ boiling point.

Question 15

Is a mixture pure?

Answer 15

No, it is not because it will melt or boil gradually over a range of temperatures

Question 16

What is an ionic bond?

Answer 16

an ionic bond is when a metal loses an electron to give it to a non metal who takes the electron. Hence an ionic bond is the transfer of electrons.

Question 17

what are examples of ionic compounds?

Answer 17

NaCl, KCl,MgO, Na2O

Question 18

What type of structure does an ionic bond have? what are the implications?

Answer 18

Ionic compounds have a lattice structure, the ions within the structure are strongly attracted to each other via electrostatic attraction, therefore this results in ionic compounds having a high melting/ boiling point.

Question 19

What is a covalent bond?

Answer 19

It is a bond produced when atoms share electrons, atoms involved in producing the covalent bond achieve a full outer shell. This makes them very stable. It is also important to note that there is a strong electrostatic attraction between the positively charged nuclei of the atoms involved and the negatively charged shared electrons.