Chemical Changes from Acids and Bases

Holly has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piece of blue litmus paper into the substance, and the litmus paper stays blue.

The substance in the beaker

• is a base.

• has a neutral pH.

• is an acid.

• does not have a pH.

Tags

NGSS.MS-PS1-2

Which of the following statements is correct?

• Blue litmus paper turns red when placed in a base.

• Red litmus paper turns blue when placed in a base.

• Blue litmus paper stays blue when placed in an acid.

• Red litmus paper stays red when placed in a base.

Tags

NGSS.MS-PS1-2

Which of the following is an acid?

• shampoo

• baking soda

• orange juice

• water

The pH of a solution is tested, and it is found to be a basic solution. Of the following choices, what could the pH have been?

• 3

• 9

• 7

• 5

Many cleaning solutions are bases. Which of the following is a property of most bases?

• feels slippery

• white color

• can only be liquid

• tastes sour

Tastes bitter.

• Acids

• Bases

• Salts

• All

When dissolved in water, acids produce:

• bases

• salts

• hydrogen ions

• hydroxide ions

Tags

NGSS.MS-PS1-2

Evidence of a chemical reactions is anything that shows -

• a new substance has formed

• a solid dissolved in a liquid

• interaction between 2 gases

• a change in the state of matter

Tags

NGSS.MS-PS1-2

One of the signs of a chemical reaction taking place is:

• Bubbles are produced

• Reactants are not combining

• Products are not forming

• Color is not changing

Tags

NGSS.MS-PS1-2

Which is NOT an indication of a chemical change?

• temperature change

• formation of a precipitate

• shape change

• production of light

Tags

NGSS.MS-PS1-2