science form 2 chapter 5 and 6

More than _______________ of Earth's surface is covered with water.

• 60%

• 70%

• 65%

• 80%

Tags

NGSS.MS-ESS2-4

Water is a ____________________________ .

• mixture

• atom

• compound

• solid

Water molecule is made of ___________ of hydrogen and __________________ atom of oxygen.

• one , two

• three , two

• two , one

• two , two

Tags

NGSS.MS-PS1-1

Sublimation is a process of changes in the state of matter from ___________________________________________

• gas to solid

• solid to liquid

• liquid to gas

• gas to liquid

Tags

NGSS.MS-PS1-4

These two processes absorbs heat energy during the changes in the state of matter.

• freezing and evaporation

• evaporation and condensation

• boiling and melting

• freezing and condensation

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

During electrolysis the ___________________ gas is produced at the anode

• oxygen

• hydrogen

The impurities such salt when added to water will _______________ the freezing point of water.

• increase

• remain the same

• decrease

The impurities such as sugar or salt will _____________________________________ the boiling point of the water.

• increase

• remain the same

• decrease

Evaporation only occurs on the ___________________ of water

• bottom

• surface

• boiling point

One of the characteristic below does not affect the rate of evaporation :

• humidity

• colour of the water

• total surface area of the water

• surrounding temperature

• movement of air speed