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Which of these is an example of a physical change?
A new material is formed
Liquid nitrogen exposed to air becomes nitrogen gas
the molecules in solids stay in definite close location and vibrate
melting ice
baking the stromboli bread to form the crust of the sandwich
move faster and farther apart
popping popcorn
gas
Which of the following is a characteristic of all chemical changes?
A new material is formed
Liquid nitrogen exposed to air becomes nitrogen gas
the molecules in solids stay in definite close location and vibrate
melting ice
baking the stromboli bread to form the crust of the sandwich
move faster and farther apart
popping popcorn
gas
Which action will result in a product with new chemical properties?
A new material is formed
Liquid nitrogen exposed to air becomes nitrogen gas
the molecules in solids stay in definite close location and vibrate
melting ice
baking the stromboli bread to form the crust of the sandwich
move faster and farther apart
popping popcorn
gas
A pot on the stove containing water is heated. As the water boils the molecules -----
A new material is formed
Liquid nitrogen exposed to air becomes nitrogen gas
the molecules in solids stay in definite close location and vibrate
melting ice
baking the stromboli bread to form the crust of the sandwich
move faster and farther apart
popping popcorn
gas
Solids have definite shape and volume. This is because
A new material is formed
Liquid nitrogen exposed to air becomes nitrogen gas
the molecules in solids stay in definite close location and vibrate
melting ice
baking the stromboli bread to form the crust of the sandwich
move faster and farther apart
popping popcorn
gas
The random molecular motion of a substance is greatest when the substance is
A new material is formed
Liquid nitrogen exposed to air becomes nitrogen gas
the molecules in solids stay in definite close location and vibrate
melting ice
baking the stromboli bread to form the crust of the sandwich
move faster and farther apart
popping popcorn
gas
In making a stromboli sandwich, which process involves a chemical change?
A new material is formed
Liquid nitrogen exposed to air becomes nitrogen gas
the molecules in solids stay in definite close location and vibrate
melting ice
baking the stromboli bread to form the crust of the sandwich
move faster and farther apart
popping popcorn
gas
Which of the following is an example of physcial change?
A new material is formed
Liquid nitrogen exposed to air becomes nitrogen gas
the molecules in solids stay in definite close location and vibrate
melting ice
baking the stromboli bread to form the crust of the sandwich
move faster and farther apart
popping popcorn
gas
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