Chemistry Quiz

What causes the polarity of a water molecule?

• The oxygen atom has a partial positive charge.

• The hydrogen atoms share electrons equally with oxygen.

• The oxygen atom pulls electrons towards itself more than the hydrogen atoms.

• The hydrogen atoms have a partial negative charge.

How is water polar?

• Oxygen is partially negative, and hydrogen is neutral.

• Both hydrogen and oxygen are partially positive.

• Oxygen is partially positive, and hydrogen is partially negative.

• Oxygen is partially negative, and hydrogen is partially positive.

What property of water allows water bugs to glide across the surface?

• Viscosity

• Surface tension

• Density

• Temperature

What happens when the partial positive hydrogens on one water molecule are attracted to the partial negative oxygens on another water molecule?

• It decreases the boiling point of water

• It forms a covalent bond

• It creates hydrogen bonding

• It increases the solubility of gases

Tags

NGSS.MS-PS2-5

What does it mean for a species to be amphoteric in chemistry?

• It can only act as a base.

• It can only act as an acid.

• It can act as either an acid or a base.

• It does not react with acids or bases.

What type of solution can still dissolve more solute when additional solute is added?

• Saturated solution

• Supersaturated solution

• Unsaturated solution

• None of the above

What happens when no more solute can dissolve in a solution?

• It becomes a supersaturated solution

• It becomes an unsaturated solution

• It becomes a saturated solution

• It spontaneously generates heat

What is a characteristic of a supersaturated solution?

• It cannot dissolve additional solute

• It can dissolve infinite amounts of solute

• It is very stable with extra solute

• It may form crystals if more solute is added

What type of solution is formed when 60 grams of NH4Cl is dissolved in 100 grams of water at 70°C according to the solubility curve?

• Supersaturated

• Saturated

• Unsaturated

• Dilute

If 70 grams of NH4Cl are dissolved in 100 grams of water at 70°C, what type of solution is it?

• Saturated

• Supersaturated

• Unsaturated

• Concentrated