Physical And Chemical Changes Question Preview (ID: 34359)
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Matter can undergo physical and chemical changes. A physical change is a change of matter from one form to another without a change in the identify of the substance. Which process is an example of a physical change?
a) ice melting
b) milk souring
c) metal rusting
d) wood burning
Pablo notices that ice cream begins to melt when left out at room temperature. What is Pablo observing?
a) physical change
b) chemical change
c) chemical reaction
d) formation of a new substance
Gallium is a metal. If you hold a solid piece of pure gallium in your hand, your body warmth will melt the gallium. What is this an example of?
a) absorption
b) displacement
c) physical change
d) chemical change
In the laboratory, Austin is given a mixture of iron filings, sand, and salt. To separate the mixture, Austin uses a magnet, boiling water, and a filter. Which statement is true about the process Austin uses to separate this mixture?
a) Austin uses only physical changes to separate the mixture’s components
b) Austin uses only chemical changes to separate the mixture’s components.
c) Austin uses both physical and chemical changes to separate the mixture’s components.
d) Austin uses neither physical nor chemical changes to separate the mixture’s components.
A molecule is involved in a chemical reaction, causing the arrangement of its atoms to change. What is the result of this process?
a) new atoms are formed
b) the mixture is separated into its component parts
c) a different molecule with different properties is formed
d) bonds are neither formed nor broken, so mass is conserved
There are several differences between chemical and physical changes. Which process is an example of a chemical change?
a) a metal railing rusting in damp weather
b) alcohol evaporating from a cotton swab
c) steam rising from a boiling pot of soup
d) a piece of wood shrinking as it dries out
Alison finds the total mass of a sample of baking soda, a balloon, and a glass container with vinegar in it. She adds the baking soda to the vinegar and immediately places the balloon over the mouth of the container. After the reaction is complete,
a) Mass is gained during the reaction because a chemical change is taking place.
b) The mass does not change because chemical changes observe the law of conservation of mass.
c) Mass is lost during the reaction because the gas is less dense than the baking soda or vinegar.
d) Mass is lost during the reaction because the gas can change in volume but baking soda and vinegar cannot.
Rita wants to make some toast for breakfast, which she knows involves a chemical change to the bread. She puts a slice of bread in the toaster, but, after 10 minutes, she notices that the sides of the bread are black. What caused this chemical change
a) an increase in temperature
b) a decrease in temperature
c) the size of the bread
d) the type of bread
Which types of changes observe the law of conservation of mass?
a) only changes of state
b) only physical changes
c) only chemical changes
d) physical and chemical changes
When paper is burned, the mass of the remaining ash is less than the mass of the original paper. Which statement best explains this result?
a) The ash has less volume than the paper.
b) Some of the matter is destroyed during the reaction.
c) The mass of the ash cannot be accurately determined.
d) Some of the products of the reaction were given off as a gas.
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