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How do you know whether a chemical reaction between two substances has occurred?
substances with different properties form a new substance
an increase in temperature
new substances are created
rocket fuel burning
a decrease in temperature
matter is neither created nor destroyed
They are rearranged.
iron rusts
What happens during a chemical change?
substances with different properties form a new substance
an increase in temperature
new substances are created
rocket fuel burning
a decrease in temperature
matter is neither created nor destroyed
They are rearranged.
iron rusts
All of the following are physical changes except:
substances with different properties form a new substance
an increase in temperature
new substances are created
rocket fuel burning
a decrease in temperature
matter is neither created nor destroyed
They are rearranged.
iron rusts
Which of the following is an example of a chemical reaction?
substances with different properties form a new substance
an increase in temperature
new substances are created
rocket fuel burning
a decrease in temperature
matter is neither created nor destroyed
They are rearranged.
iron rusts
What happens to atoms in a chemical reaction?
substances with different properties form a new substance
an increase in temperature
new substances are created
rocket fuel burning
a decrease in temperature
matter is neither created nor destroyed
They are rearranged.
iron rusts
Which observation would most likely indicate that an endothermic reaction has occurred?
substances with different properties form a new substance
an increase in temperature
new substances are created
rocket fuel burning
a decrease in temperature
matter is neither created nor destroyed
They are rearranged.
iron rusts
Which observation would most likely indicate that an exothermic reaction has occurred?
substances with different properties form a new substance
an increase in temperature
new substances are created
rocket fuel burning
a decrease in temperature
matter is neither created nor destroyed
They are rearranged.
iron rusts
What does the law of conservation of matter state?
substances with different properties form a new substance
an increase in temperature
new substances are created
rocket fuel burning
a decrease in temperature
matter is neither created nor destroyed
They are rearranged.
iron rusts
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