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A(n) _________________ is a substance that increases a reaction rate by lowering the activation energy necessary for a reaction to occur. Enzymes serve this function in the chemical reactions that take place in our digestive system.
Law of Conservation of Energy
it releases energy to the surroundings
single replacement
catalyst
thermal and light
FALSE
TRUE
exothermic reactions
In physics and chemistry, the ______________________ states that the total energy of an isolated system remains constant; it is said to be conserved over time.
Law of Conservation of Energy
it releases energy to the surroundings
single replacement
catalyst
thermal and light
FALSE
TRUE
exothermic reactions
Replacement reactions involve a rearrangement of metal and nonmetal elements in Ionic Compounds.
Law of Conservation of Energy
it releases energy to the surroundings
single replacement
catalyst
thermal and light
FALSE
TRUE
exothermic reactions
Chemical Reactions that RELEASE thermal energy are called ____________________.
Law of Conservation of Energy
it releases energy to the surroundings
single replacement
catalyst
thermal and light
FALSE
TRUE
exothermic reactions
Combustion reactions always include Carbon Dioxide and Water as reactants.
Law of Conservation of Energy
it releases energy to the surroundings
single replacement
catalyst
thermal and light
FALSE
TRUE
exothermic reactions
In a _________________ reaction, one element replaces another element in a compound.
Law of Conservation of Energy
it releases energy to the surroundings
single replacement
catalyst
thermal and light
FALSE
TRUE
exothermic reactions
A combustion reaction usually releases energy as _________________________ energy.
Law of Conservation of Energy
it releases energy to the surroundings
single replacement
catalyst
thermal and light
FALSE
TRUE
exothermic reactions
When a chemical bond forms, __________________.
Law of Conservation of Energy
it releases energy to the surroundings
single replacement
catalyst
thermal and light
FALSE
TRUE
exothermic reactions
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