chemistry

Question 1

dissociation

Answer 1

soluble ionic compounds will dissociate into separate ions when they are put in water
KCl(s) > K(aq) + Cl(aq)

Question 2

acid + hydroxide (base) >

Answer 2

salt + water

Question 3

acid + oxide (base) >

Answer 3

salt + water

Question 4

acid + metal >

Answer 4

salt + hydrogen

Question 5

acid + carbonate >

Answer 5

salt + carbon dioxide gas + water

Question 6

acid + hydrogen carbonate >

Answer 6

salt + carbon dioxide gas +water

Question 7

physical properties of group 1

Answer 7

• soft
• malleable
• greyish, silver

Question 8

physical properties of group 17

Answer 8

• low boiling and melting points
• low density
• all 3 states of matter at room temp

Question 9

group 1 metals form an ion with +1 charge

Answer 9

loss 1 electron leaving a positive charge ion

Question 10

group 17 metals form an ion with -1 charge

Answer 10

gain 1 electron to complete the outer shell leaving a negatively charge ion

Question 11

correct labelling of an element

Answer 11

A (mass no.)
X (element)
Z (atomic no.)

Question 12

group

Answer 12

same no. of valance electron in every group

Question 13

period

Answer 13

same no. of shells

Question 14

reactivity changes as you go down group 1

Answer 14

• as you go down G1, the element becomes more and more reactive because they have to loose 1 electron
• that electron is further from the positively charged nucleus, therefore the attraction on the electron from the nucleus is weaker and so is more easily lost.

Question 15

reactivity changes as you go down group 17

Answer 15

• as you go down G17, the elements reactivity decreases because they only have to gain 1 electron
• As you go down the group, the attraction from the nucleus to the outermost electrons gets weaker, so it is harder to pull in the extra electron.

Question 16

precipitation reaction

Answer 16

when two solutions are mixed together and an insoluble substance (precipitate) is formed
AgNO3(aq) + NaCl(aq) > NaNO3(aq) + AgCl(s)

Question 17

what charge does a cation have

Answer 17

positive (loses an electron) (group1)

Question 18

what charge does an anion have

Answer 18

negative (gains an electron) (group17)