COMPOSITION OF WATER

Water is a

• compound

• element

• mixture

Water is made up of _________________.

(Choose two correct answers.)

• chlorine

• carbon

• oxygen

• hydrogen

Water is combined __________________ .

• chemically

• physically

• none of above

• both answer

We can determine the composition of elements in a water molecule through _______________________.

• photosynthesis

• combustion

• respiration

• electrolysis

Define anode.

• electrode that is connected to the positive terminal of a battery

• electrode that is connected to the negative terminal of a battery

Define cathode.

• the electrode that is connected to the positive terminal of a battery

• the electrode that is connected to the negative terminal of a battery

What is the chemical symbol of water?

• H₂O

• O₂H

• H₃O

• HO₂

What are the gases produced at anode and cathode?

• Anode: oxygen gas, cathode: hydrogen gas

• Anode: hydrogen gas, cathode: oxygen gas

What is electrolysis?

• breaking down of a compound using a current
• making a compound using a current

Which of the following electrode is a negative electrode?

• Carbon electrode X

• Carbon electrode Y