close

Вход

Забыли?

вход по аккаунту

код для вставкиСкачать
MYP 3 Demonstration 2.4
Student Sheet
DECOMPOSING WATER USING HOFMANN’S VOLTAMETER
Using this apparatus is used to electrolyse solutions and collect any gases produced. Water
is a compound of hydrogen and oxygen, but pure water doesn’t conduct electricity well.
Reservoir
GAS A
GAS B
Dilute Sulphuric Acid
Platinum Electrode
Low voltage
D.C. supply
1. What is the sulphuric acid for?
.............................................................................................................................................
2. What happens at the platinum electrodes when an electric current is passed through the
water?
.............................................................................................................................................
3. What happens to the rate of the reaction as the voltage is increased?
.............................................................................................................................................
1
MYP 3 Demonstration 2.4
Student Sheet
4. Which gas is formed
at the positive electrode (anode)?
…………………………………………………………………….
at the negative electrode (cathode?
…………………………………………………………………….
5. How can the gases produced be identified?
.............................................................................................................................................
.............................................................................................................................................
6. In what proportions are the gases produced?
.............................................................................................................................................
7. What does this suggest to you about the ratio of atoms of the atoms of these elements
in water?
.............................................................................................................................................
8. What happens to the level of water in the reservoir as the experiment continues?
.............................................................................................................................................
Explain this change.
.............................................................................................................................................
.............................................................................................................................................
2
1/--страниц
Пожаловаться на содержимое документа