revision topic 7

Question 1

what are alkalis

Answer 1

they are soluble hydroxides

Question 2

what are bases

Answer 2

they are substances that neutralize acids

Question 3

what makes a solution acidic

Answer 3

H+

Question 4

what makes a solution alkaline

Answer 4

OH-

Question 5

what is the color of an acidic solution once a universal indicator is added

Answer 5

orange/red

Question 6

what is the color of an alkalis solution once a universal indicator is added

Answer 6

lilac/purple

Question 7

what is the color of a neutral solution once a universal indicator is added

Answer 7

green

Question 8

how is a salt formed

Answer 8

it is formed once the hydrogen in an acid is replaced by metal

Question 9

show neutralizing reaction

Answer 9

acid + base ——–> a salt + water

Question 10

salts formed from HCl…

Answer 10

contains chloride ions

Question 11

salts formed from HSO…

Answer 11

contains sulfate ions

Question 12

salts formed from HNO…

Answer 12

contains nitric ions

Question 13

explain how you make copper salt

Answer 13

1. add excuses insoluble copper oxide to sulfuric acid and swirl, then filter the solution from excuses copper oxide, then produce to run a water bath for the filtrate of copper chloride then keep heating the filtrate till the point of crystallization which can determine once crystals form the remove from water bath put in room temperature and wait till the rest evaporates and the crystals to form completely

Question 14

what is a precipitation reaction

Answer 14

it is when 2 soluble salts react to form an insoluble salt

Question 15

explain how to make an insoluble salt

Answer 15

add potassium iodine to lead nitrate and swirl then remove the lead iodine by filtration leaving you with solid potassium nitrate which is washed with distilled water and dried