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- 1. Multiple Choice
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.
- 2. Multiple Choice
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.
- 3. Multiple Choice
Which of the following is an acid?
shampoo
baking soda
orange juice
water
- 4. Multiple Choice
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
- 5. Multiple Choice
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
- 6. Multiple Choice
Tastes bitter.
Acids
Bases
Salts
All
- 7. Multiple Choice
When dissolved in water, acids produce:
bases
salts
hydrogen ions
hydroxide ions
- 8. Multiple Choice
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
- 9. Multiple Choice
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
- 10. Multiple Choice
Which is NOT an indication of a chemical change?
temperature change
formation of a precipitate
shape change
production of light
- 11. Multiple Choice
You know you a chemical reaction has occurred if
there is a precipitate.
there is a color change.
there is a temperature change.
All of these answers are evidence.
- 12. Multiple Choice
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
The level of the substance in the beaker is higher after the other liquid is added.
A yellow solid forms and then settles to the bottom of the beaker.
Small white crystals are left behind in the flask that held the first liquid.
The mass of the combined liquids is greater than either original liquid.
- 13. Multiple ChoiceFour students performed four different investigations by combining different substances. Which of the observations is most indicative of a chemical reaction?investigation 1investigation 2investigation 3investigation 4
- 14. Multiple ChoiceWhat type of change do we see in when we melt ice?Physical ChangeChemical Change
- 15. Multiple ChoiceThis is used to represent the number of each atom being represented.An exponentThe coefficientA moleculeThe subscript
- 16. Multiple Choice
A chemical change is?
a shoe lace cut in half
doesn't change anything
changes the look of an object
change that results in the formation of new chemical substances
- 17. Multiple ChoiceWhich of the following models best demonstrates a balanced chemical equation?FGHJ
- 18. Multiple ChoiceWhich of these formulas contain equal numbers of nitrogen atoms?Formulas I and IIIFormulas I and IVFormulas II and IIIFormulas I, II, and V
- 19. Multiple Choice
Two clear colorless solutions were combined.
The student observed that the temperature changed from 25 •C to 23 •C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?
One of the original compounds came out of solution
The solutions reacted chemically
Some of the water froze into ice crystals
Rapid evaporation of water occurred, leaving a solid
- 20. Multiple Choice
Which of the following describes a precipitate?
a liquid forms when a block of metal is heated
a solid forms when one liquid is poured into another
a gas forms when a solid is placed in a liquid
bubbles form when an acid is poured on a rock
- Answer choicesTagsAnswer choicesTags