Chemistry Water

When grains of sugar are added to water the sugar molecules become surrounded by the attracted water molecules so that the individual sugar molecules are no longer part of the sugar crystals. This process continues until either all the sugar (________) has dissolved in the water (_________) to form a solution, or there are no longer any unattached water molecules remaining and so no more sugar can dissolve.

• solvent, solute

• solid, liquid

• liquid, solid

• solute, solvent

The acceptable pH level for drinking water is between _________.

• 1.5 - 3.5

• 4.0 - 6.0

• 6.5 - 8.5

• 9.0 - 11.0

Water is made from two different elements, these are________.

• Magnesium and Oxygen.

• Hydrogen and Magnesium.

• Oxygen and Hydrogen.

• Gold and Silver.

Tags

NGSS.MS-PS1-1

Water is labelled a 'polar molecule'. Why?

• There is ice at the north and south poles.

• Water molecules have positively and negatively charged ends.

• Water slides down objects.

A water molecule has the chemical formula H2O. This means that the water molecule is made up of

• Two hydrogen atoms and one oxygen atom

• Two oxygen atoms and one hydrogen atom

• Two hydrogen atoms and two oxygen atoms

• Two molecules of water

Tags

NGSS.MS-PS1-1

The chemical compound of water is...

• HO

• H₂O

• H₃O

• HO₂

Tags

NGSS.MS-PS1-1

The residents of a suburban neighborhood have been experiencing foul-smelling tap water for several weeks. They suspect contamination and are concerned about the safety of their drinking water. What action should the residents take to address the issue with their tap water? Select TWO answers.

• Install a cheap water softening system.

• Contact the local water utility for testing.

• Boil the tap water before consumption.

• Use bottled water for all household purposes

• Ignore the issue as it might resolve on its own.

Tags

NGSS.HS-LS2-7

Water that is contaminated with lead will have a high ______.

• conductivity

• nitrates

• pH

• water hardness

The property of water molecules being attracted to other water molecules is called _________.

The property of water molecules being attracted to other substances/materials (glass, soil) is called __________.