Solutions, Acids, and Bases

Compared to the pH of saliva, the pH number of stomach juices is ____.

• The same

• Higher

• Lower

• Unpredictable

When forming a solution, which choice below is NOT a way to speed up the rate of dissolving process?

• crushing the solute

• stirring the solution

• adding the solute quickly

• increasing the temperature of the solvent

In terms of pH, explain what would happen if you mixed vinegar with a solution of ammonia. What type of products would form?

• salt and water

• salt and vinegar

• water only

• salt and carbon dioxide

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

At the same concentrations, strong acids produce more _________________________than weak acids.

• Hydrogen ions

• Hydroxide ions

• both hydrogen and hydroxide ions

• solvent

In a water solution, how do acids differ from bases?

• Acids form hydrogen ions (H+), while bases form hydroxide ions (OH–)

• Acids turn litmus blue, while bases turn litmus red

• Acids form salts, bust bases do not

• Hydrogen ions (H+) remain dissolved, but hydroxide ions (OH–) do not

The concentration of a solution refers to the amount of solute that has been dissolved in a given amount of solvent. Consider the solution seen here. Select ALL the ways that this solution could be made more concentrated.

• Increase the amount of solute

• Decrease the amount of solute

• Decrease the amount of solvent

• Increase the amount of solvent

Matt, Erin, and Lauren were having a challenge to see who could dissolve a one-pound cube of sugar the quickest.

Matt puts his sugar cube in a bucket of water and stirs it with a wooden spoon. Erin heats up the water before putting it into her bucket and uses a wood spoon to stir it. What should Lauren do to have her cube dissolve the fastest?

• Place the sugar cube into a bucket of cold water and stir really, really fast.

• Place the sugar cube into a bucket of hotter water and stir slower than Matt and Erin.

• Get a smaller container with less water and put the sugar cube in it and shake it.

• Break the sugar cube into smaller pieces, put into hot water and stir it.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What property do all three of these common household substances have in common? (ex. bleach, detergent, Pepto bismal)

• They are all acidic

• They all taste sour

• They all have a pH above 7

• They all turn litmus paper red.

Which compound demonstrated the LEAST increase of solubility as a result of an increase in temperature?

• potassium iodide

• sodium nitrate

• potassium chlorate

• sodium chloride

Tags

NGSS.MS-PS1-2

In the reaction of Ca(OH)2 and H2SO4, an acid and base when mixed together is called?

• neutralization

• red solution

• basic solution