concentration

Question 1

concentration

Answer 1

concentration of a solution is how much dissolved solid there is in it.

Question 2

concentration

Answer 2

concentration=mass of solid×volume of solution

Question 3

reactivity of metals

Answer 3

metal atom forms a positive ion the more reactive it will be.
you see how quickly bubbles of hydrogen are formed.
more reactive the metal the faster the bubbles will form

Question 4

reactivity of metals

Answer 4

very reactive metals e.g. potassium will react vigorously with water.

Question 5

reactivity of metals

Answer 5

Less reactive metals e.g. iron won’t react much with cold water but will react with steam.

Question 6

reactivity of metals

Answer 6

copper won’t react with either water or steam.

Question 7

reactivity of metals

Answer 7

very reactive metals e.g. sodium will fizz wildly.
less reactive metals e.g. zinc will bubble abit.
unreactive metals e.g. copper will not react with dilute acids at all

Question 8

extracting metals using electrolysis

Answer 8

metal are extracted from metal ores using electrolysis.the metal ores need to be melted so they’re a liquid.

Question 9

extracting metals using electrolysis

Answer 9

ions will be free to move

Question 10

extracting metals using electrolysis

Answer 10

once the metal ore is melted an electric current is passed through it.

Question 11

atom

Answer 11

protons are heavy and positively charged.
neutrons are heavy and neutral.
electrons have hardly any mass and are negatively charged.

Question 12

atom

Answer 12

the nucleus
it contains protons and neutrons.
it has a positive charge because of the protons.

Question 13

atom

Answer 13

electrons move around the nucleus in electron shell.
negative charge.
electrons have a tiny mass.

Question 14

ions

Answer 14

ions are charged particles.they can be a single particle or group of particles
atoms lose or gain electrons to form ions with a full outer shell.

Question 15

ions

Answer 15

●negative ions = anions. when atoms gain electrons-they have more electrons then protons.
●positive ions = cations. form when atoms lose electrons-more protons than electrons.

Question 16

ionic bonding

Answer 16

●metals and non metals react together.the metal atoms lose electrons to form positive ions cations.
●non metals atom gain these electrons to form negative ion anions

Question 17

ionic compounds

Answer 17

●ionic compound always have gaint lattice structures.

●there are very strong electrostatic forces of attractions between oppositely charged ions-these are ionic bonds.

Question 18

ionic compounds

Answer 18

have high melting and boiling points-it takes lots of energy to break the strong attraction between the ions.

Question 19

ionic compounds

Answer 19

●solid ionic compound don’t conduct electricity this is because the ions can’t move.
●when they’re free to move,they carry electric current.it happens when it dissolve in water.

Question 20

metallic bonding

Answer 20

●metals have a gaint structure.
●they are made up of metal atoms in arranged in regular layers.
●there are strong forces of electrostatic attraction between positive metal ion and negative electrons.