acids alkali

Question 1

what are the middle and end numbers of the pH scale

Answer 1

7 and 14

Question 2

testing for neutralisation reaction equation

Answer 2

alkali + acid arrow salt + water

Question 3

what is indicator

Answer 3

something that changes colour depending if its alkali or acid

Question 4

two types of indicator

Answer 4

litmus paper (blue=alkali red=acid)
universal indicator = turns to colour of pH scale

Question 5

4 steps for making salts

Answer 5

add acid + alkali to water
test drops of it on universal indicator paper
when neutral(green) boil
leave solution to crystallise

Question 6

reactivity series in order

Answer 6

Au, Ag, Cu, H, Pb, Fe, Zn, C, Al, Mg, Ca, Na, K

Question 7

how are some ores extracted

Answer 7

reduction (carbon used)
electrolysis

Question 8

how to test for hydrogen equation

Answer 8

metal (higher than hydrogen) + acid —> salt + hydrogen

Question 9

what is displacement reaction

Answer 9

when a more reactive metal deplaces a less reactive element from its compound