oxygen and oxides

Question 1

how do you measure the % of oxygen?

Answer 1

by reacting it with another element-typically a metal

Question 2

if the air in one of these experiments doesnt decrease by 21% why could it be?

Answer 2

• the metal wasnt heated for long enough for all the oxygen to be reacted
• theres a leak in the apparatus

Question 3

what is element combustion?

Answer 3

when an element reacts with oxygen to produce an oxide

Question 4

what oxide name does a metal take?

Answer 4

metal oxide

Question 5

what oxide name does a non-metal take?

Answer 5

non-metal dioxide

Question 6

what states are metal oxides?

Answer 6

solids

Question 7

what states are non-metal dioxides?

Answer 7

gas

Question 8

what is the chemical and word equation for the combustion of magnesium?

Answer 8

• magnesium + oxygen -> magnesium oxide
• 2Mg + O2 -> 2MgO

Question 9

observations for the combustion of magnesium?

Answer 9

bright white light formed and white powder formed

Question 10

what is the word and chemical equation for the combustion of sulphur?

Answer 10

-sulphur + oxygen -> sulphur dioxide
-S + O2 -> SO2

Question 11

what are the observations for the combustion of sulphur?

Answer 11

blue flame

Question 12

what is the word equation and symbol equation for the combustion of hydrogen?

Answer 12

-hydrogen + oxygen -> water
-2H2 + O2 -> 2H2O

Question 13

what observations are there with the combustion of hydrogen?

Answer 13

squeaky pop

Question 14

iron(II)?

Answer 14

Fe 2+

Question 15

iron (III)?

Answer 15

Fe 3+

Question 16

copper?

Answer 16

Cu 2+

Question 17

silver?

Answer 17

Ag+

Question 18

zinc?

Answer 18

Zn2+

Question 19

lead?

Answer 19

Pb 2+

Question 20

what is the chemical test for oxygen?

Answer 20

relights a glowing splint

Question 21

metal oxides form what kind of solutions?

Answer 21

alkaline

Question 22

non-metal dioxides form what kind of solutions?

Answer 22

acidic

Question 23

how do you dissolve a metal oxide?

Answer 23

-combust it in oxygen
-dissolve the oxide formed
-check the pH of the solution formed with indicator