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In chemical reactions, the number of atoms in the product is __________.
endothermic reaction
18
the same as the number of atoms in the reactants
this is an example of an exothermic reaction
All of these are true.
exothermic reaction
There are more oxygen atoms on the right side of the arrow then on the left side.
energy is taken in during the chemical reaction
Changes in thermal energy provide evidence that a chemical reaction has occurred. Which of the following BEST describes a chemical reaction in which energy is released?
endothermic reaction
18
the same as the number of atoms in the reactants
this is an example of an exothermic reaction
All of these are true.
exothermic reaction
There are more oxygen atoms on the right side of the arrow then on the left side.
energy is taken in during the chemical reaction
Which of the following statements is true regarding the Law of Conservation of Mass?
endothermic reaction
18
the same as the number of atoms in the reactants
this is an example of an exothermic reaction
All of these are true.
exothermic reaction
There are more oxygen atoms on the right side of the arrow then on the left side.
energy is taken in during the chemical reaction
n a chemical reaction you begin with 18 atoms. When the reaction is over you would expect to have __________ atoms remaining.
endothermic reaction
18
the same as the number of atoms in the reactants
this is an example of an exothermic reaction
All of these are true.
exothermic reaction
There are more oxygen atoms on the right side of the arrow then on the left side.
energy is taken in during the chemical reaction
Which statement correctly describes how the following chemical equation violates the law of conservation of mass? H2 + O2 → 2HO2
endothermic reaction
18
the same as the number of atoms in the reactants
this is an example of an exothermic reaction
All of these are true.
exothermic reaction
There are more oxygen atoms on the right side of the arrow then on the left side.
energy is taken in during the chemical reaction
Meals, Ready to Eat are an instant hot meal developed by the U.S. military for troops. The meal heats up when water is added to the magnesium metal tray because the chemical reaction between water and magnesium is an _________.
endothermic reaction
18
the same as the number of atoms in the reactants
this is an example of an exothermic reaction
All of these are true.
exothermic reaction
There are more oxygen atoms on the right side of the arrow then on the left side.
energy is taken in during the chemical reaction
Mixing baking soda and vinegar is an example of an endothermic reaction. This means:
endothermic reaction
18
the same as the number of atoms in the reactants
this is an example of an exothermic reaction
All of these are true.
exothermic reaction
There are more oxygen atoms on the right side of the arrow then on the left side.
energy is taken in during the chemical reaction
Changes in the total amount of thermal energy provide evidence that chemical reactions have taken place. A chemical reaction in which energy has been absorbed is known as a(n):
endothermic reaction
18
the same as the number of atoms in the reactants
this is an example of an exothermic reaction
All of these are true.
exothermic reaction
There are more oxygen atoms on the right side of the arrow then on the left side.
energy is taken in during the chemical reaction
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