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- Q1
Which of the following is NOT a chemical change?
Burning a log of wood
Baking a bread
Dissolving sugar in water
Frying an egg
30sS8MT-IIIc-d-9 - Q2
Which of the following is a sign that a chemical change is taking place?
smelling an offensive odor
watching something dissolve in water
a substance is melted at high heat
the ability to break an object into pieces
30sS8MT-IIIc-d-9 - Q3
Which of the following situations show chemical change?
Rust forms on a hammer that has been left outside too long.
A rock breaks into smaller pieces when it is struck with a hammer.
A solid is formed when heat is removed from a sample of water.
A cup of water turns pink when a few drops of red food coloring are added.
30sS8MT-IIIc-d-9 - Q4
What happens to the particles of a substance after undergoing a chemical change?
Bonds between particles of the substances are broken.
Energy is absorbed or released by the particles.
New bonds are formed between particles of the substances.
All of the above
30sS8MT-IIIc-d-9 - Q5
Physical change is a change in the physical properties of a substance such as size or shape. Which of the following is NOT a physical change?
Burning a log of wood
Dissolving sugar in water
Crushing a can
Breaking a glass
30sS8MT-IIIc-d-9 - Q6
A phase change is a physical process in which a substance goes from one phase to another. When does phase change occur?
Heat is added to or removed from the substance.
A substance is combined with another substance.
Particles of the substance maintain their kinetic energy.
Particles of the substance are not changing their motion.
30sS8MT-IIIc-d-9 - Q7
What happens to the particle arrangement of a liquid when it changes to gas?
Particles move close to one another and become ordered.
Particles move distant from each other in random motion.
Particles do not move. Particles are close together with no regular arrangement.
None of the above
30sS8MT-IIIc-d-9 - Q8
Which is evidence of chemical change?
Increase of temperature
Appearance of new substance
Formation of new shape
Drastic change of size
30sS8MT-IIIc-d-9 - Q9
A student mixed two clear liquids together. After a few minutes, a white powdery solid was seen and settled at the bottom of the test tube. What conclusion can be made based on the observations cited above?
The liquids have been stored too long and no longer good.
The liquids are toxic and should be handled with caution.
The liquids were pure substances before they were mixed.
The liquids have gone through a chemical change in which a precipitate was formed.
30sS8MT-IIIc-d-9