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A bag containing several chemicals is used for sports injuries. When the chemicals are combined, the bag becomes cold. What is this evidence of?
Physical property
The heat energy causes molecules to move faster and they move farther apart. Some have enough energy to escape from a liquid
If we heat vinegar and add baking soda, then it will react faster
Change in energy
Light, heat
Mass
Chemical change
He will turn the heat up so that it just barely boils
Students were asked to design an experiment that added or removed energy to a chemical reaction. Which of the following hypothesis would be found in an experiment that tested this?
Physical property
The heat energy causes molecules to move faster and they move farther apart. Some have enough energy to escape from a liquid
If we heat vinegar and add baking soda, then it will react faster
Change in energy
Light, heat
Mass
Chemical change
He will turn the heat up so that it just barely boils
What kinds of energy are produced by bright fireworks?
Physical property
The heat energy causes molecules to move faster and they move farther apart. Some have enough energy to escape from a liquid
If we heat vinegar and add baking soda, then it will react faster
Change in energy
Light, heat
Mass
Chemical change
He will turn the heat up so that it just barely boils
A student is making vegetable soup on the stove. He learned in science class that liquids boil at the same temp until they change to a gas. How will what he learned help him cook the soup and save energy?
Physical property
The heat energy causes molecules to move faster and they move farther apart. Some have enough energy to escape from a liquid
If we heat vinegar and add baking soda, then it will react faster
Change in energy
Light, heat
Mass
Chemical change
He will turn the heat up so that it just barely boils
What often happens when a chemical or physicak change occurs?
Physical property
The heat energy causes molecules to move faster and they move farther apart. Some have enough energy to escape from a liquid
If we heat vinegar and add baking soda, then it will react faster
Change in energy
Light, heat
Mass
Chemical change
He will turn the heat up so that it just barely boils
A characteristic of matter that can be observed without changing the substance into something else is known as what?
Physical property
The heat energy causes molecules to move faster and they move farther apart. Some have enough energy to escape from a liquid
If we heat vinegar and add baking soda, then it will react faster
Change in energy
Light, heat
Mass
Chemical change
He will turn the heat up so that it just barely boils
The amount of stuff in an object is known as
Physical property
The heat energy causes molecules to move faster and they move farther apart. Some have enough energy to escape from a liquid
If we heat vinegar and add baking soda, then it will react faster
Change in energy
Light, heat
Mass
Chemical change
He will turn the heat up so that it just barely boils
Which of the following statements best explains why a substance changes from a liquid to a gas when heated?
Physical property
The heat energy causes molecules to move faster and they move farther apart. Some have enough energy to escape from a liquid
If we heat vinegar and add baking soda, then it will react faster
Change in energy
Light, heat
Mass
Chemical change
He will turn the heat up so that it just barely boils
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