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

• 60%

• 70%

• 65%

• 80%

Tags

NGSS.MS-ESS2-4

Water has a high surface tension. Surface tension is a result of ______________________________ between the molecules of water at the surface that allows insects like daddy longlegs to stay afloat on the water.

• attractive force

• repulsive force

• cohesive force

• capillary force

Adhesive force between water molecules and cell walls of ______________________ allow water to be drawn up from the roots to the leaves of plants. this phenomenon is known as capillary action.

• xylem

• floem

• tube

• vessel

Water is a ____________________________ .

• mixture

• atom

• compound

• solid

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

• one atom , two atoms

• three atoms , two atoms

• two atoms , one atom

Tags

NGSS.MS-PS1-1

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

• gas to solid

• solid to liquid

• solid 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

During the electrolysis the ________________ gas is produced at cathode.

• oxygen

• hydrogen

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

• increase

• remain the same

• decrease

Tags

NGSS.MS-PS1-2

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

• increase

• remain the same

• decrease