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21 questions
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- 1. Multiple Choice
when the water changes to ice,what kind has occurred?
chemical
physical
- 2. Multiple Choice
what type of change has occurred when a nail rusts
chemical
physical
- 3. Multiple Choice
what does is mean when there is a physical change?
matter has changed
matter has decomposed
matter has changed size,shape or form
- 4. Multiple Choice
what does it mean there is a chemical change?
there is a change in the size or shape of an object
one substance has changed into another
a solid changes into a chemical
- 5. Multiple Choice
which of these is an example of a chemical change that happens inside you body?
food being decomposed by enzymes
food being broken down into small pieces by your teeth
food moves through you esophagus
- 6. Multiple Choice
what type of chemical change occurs over a long period of time?
adding chlorine to a pool
ice cream melting
metal rusting
- 7. Multiple Choice
which box has a lighter density?
box a
box b
they have the same density
- 8. Multiple Choice
a student removes a loaf of bread hot from the oven. the student cut a slice off the load and spreads butter on it.
physical change
chemical change
- 9. Multiple Choice
you forgot to dry the bread knife when you washed i and redish brown pots appeared on it.
physical change
chemical change
- 10. Multiple Choice
in a fireworks show, the fireworks explode off heat and light.
physical change
chemical change
- 11. Multiple Choice
the pH scale is a range from:
1-7
1-5
0-14
1-20
- 12. Multiple Choice
an a ____ is a substance with a pH less that 7
acid
base
alkaline
buffer
- 13. Multiple Choice
what is the only substance with neutral pH of 7?
milk
water
orange juice
blood
- 14. Multiple Choice
a pH of 3 how many times more acidic that pH of 5?
2
10
20
100
- 15. Multiple Choice
an acid
a substance that releases H+ ions when dissolves in water
is a substance that releases OH- when dissolved in water
is a substance that does not release any ions when dissolved in water
releases an equal amount of OH- and H+ ions when dissolved in water
- 16. Multiple Choice
water has a neutral because
it has more H+ ions that OH-
it does not produce any ions
it has more OH- ions than H+
it has an equal amount of H+ and OH- in solution
- 17. Multiple Choice
level of bleach
13
14
1
2
- 18. Multiple Choice
according to the pH range which substance is more acdic that lemon juice
Hydrochloric acid
cabbage
milk
- 19. Multiple Choice
soap is a weak base. what is true about the taste of bases?
they taste sour
they taste bitter
they taste sweet
they taste salty
- 20. Multiple Choice
explain what happens when a strong acid and a strong base are poured into the same container
They form separate layers
they break apart into separate elements
they mix physically but not chemically
they react chemically to form salt
- 21. Multiple Choice
which term best describes the two substances that react to form salt?
delicious
nutritious
edible
toxic
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