Water & Solution

Below are not the characteristics of water EXCEPT

• sweet taste

• boiling point of 70℃

• 3 atoms of hydrogen and 5 atoms of oxygen

• exists in solid, liquid & gas

What type of force does a mercury possess in a thermometer?

• Cohesive force

• Adhesive force

• Newton's First Law

• Convex law

What is the chemical formula for water?

• H2O

• NaSO4

• CuSO4

• NaCl

How many atoms of oxygen and hydrogen are present in water?

• 3 atoms of hydrogen, 2 atoms of oxygen

• 4 atoms of hydrogen, 5 atom of oxygen

• 2 atoms of hydrogen, 2 atoms of oxygen

• 1 atom of oxygen, 2 atoms of hydrogen

In a water electrolysis, which electrode does the oxygen attach itself to? And why?

• To the cathode because it is positively charged

• To the cathode because it is negatively charged

• To the anode because it is positively charged

• To the anode because it is negatively charged

How do we know that the gas collected from the water electrolysis experiment is either oxygen or hydrogen?

• By using limewater test

• By conducting a litmus paper test and to see it changed it to blue or red

• By using the glowing wooden splinter test

• By inhaling the gas and to hear your voice whether it is higher or lower than its normal tone

Due to impurities in the water, it affects its duration time for the water to reach its boiling point.

• True

• False

The presence of impurities DOES NOT affect the temperature of the boiling point and melting point of the water.

• True

• False

Based on the picture above, what is the name of the process above that changes liquid to gas?

• Sublimation

• Condensation

• Boiling

• Freezing

When boiling water and the temperature rises, the kinetic energy of the atoms starts to rise.

• True

• False