Chemical change
what causes chemical changes when digesting food?
acid and enzymes.
Size, shape, color, and state of a substance are examples of ________ properties.
a.) chemical
b.) physical
c.) electrical
d.) all of the above
Correct Answer – (b.) physical.
Condensation is a/an-
a.) exothermic process
b.) endothermic process
c.) ectothermic process
d.) none of the above
Correct Answer– (a.) exothermic process
is combustion a chemical reaction True OR False
True
The following occurs when heat energy is removed: Gas ---(A)--> Liquid ---(B)---> Solid What would be the phase changes for A and B respectfully?
A.
Melting, Evaporating
B.
Melting, Condensation
C.
Condensation, Freezing
D.
Condensation, Melting
E.
Boiling, Freezing
C. Condensation, Freezing
When does the breaking of a chemical bond release energy?
When new bonds form in products.
A physical change is generally _________.
a.) reversible
b.) irreversible
c.) both reversible and irreversible
d.) none of the above
Correct Answer – (a.) reversible.
Clouds in the atmosphere form because
a.) The water vapour freezes
b.) The water vapour becomes cold and condenses into a liquid
c.) The water vapour becomes warm and condenses into liquid
d.) The water vapour evaporates
Correct Answer– (b.) The water vapour becomes cold and condenses into a liquid
burning wood is a physical change True or False
true
Examine the following sequence of phase changes: Solid ---> Liquid ---> Gas Would we need to add or remove heat energy?
A.
Add heat energy
B.
Remove heat energy
C.
Neither
A. Add heat energy
What chemical change occurs when something is burning?
Atoms in a fuel react with oxygen.
During a physical change, a substance undergoes a change in its _________.
a.) physical properties
b.) chemical properties
c.) both (a) and (b)
d.) none of the above
Correct Answer – (a.) physical properties.
When does condensation occur?
a.) When solids change to liquid
b.) When liquid water changes to water vapour
c.) When water vapour changes to liquid water
d.) None of the above
Correct Answer– (c.) When water vapour changes to liquid water
rusting of iron is a physical change true or false
False
alcohol was spilled over the counter top and quickly disappeared, what phase change occurred?
A.
Evaporation
B.
Boiling
C.
Condensation
D.
Sublimation
A. Evaporation
Which of the following properties do not change in both the chemical and physical changes?
A Arrangement of particles
D Size and shape of the particle
C Density
D Mass
Answer: (d.)
Which of the following is not an example of physical change?
a.) evaporation
b.) condensation
c.) boiling
d.) rusting
Correct Answer – (d.) rusting.
Which will most likely form during the condensation process?
a.) rain
b.) hail
c.) clouds
d.) All of the above
Correct Answer– (c.) clouds
evaporation is a physical change true or false
True
A student noticed frost was on the ground at 6:30 a.m. but noticed it disappeared by 8:30 a.m. What phase change was responsible for turning the frost into water vapor?
A.
Melting
B.
Evaporation
C.
Sublimation
D.
Deposition
C. Sublimation
What element causes rusting?
Iron reacts with oxygen to form rust.
Which of the following is an example of physical change?
a.) burning of paper
b.) ripening of fruit
c.) cutting of wood
d.) cooking food
Correct Answer – (c.) cutting of wood.
Condensation is a/an-
a.) exothermic process
b.) endothermic process
c.) ectothermic process
d.) None of the above
Correct Answer– (a.) exothermic process
Changing the size and shapes of pieces or wood would be a chemical change. True or false
False
The phase change that occurs when a gas is cooled and changes into a solid is known as...
A.
Evaporation
B.
Condensation
C.
Deposition
D.
Freezing
C. Deposition