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Energy and Chemical Reactions Flashcards | StudBud

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Energy and Chemical Reactions

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A reading comprehension quiz about #endothermic and #exothermic #reactions #chemistry #conservation #matter #product #reactant #transition #calorimeter

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Questions 12

Answers

1
During an endothermic reaction energy
is unchanged.
is lost.
is gained.
2
Activation energy is the difference between a reactant's energy and the energy
at the start of the transition.
the energy of the product.
3
When a product has more energy than the reactant, the reaction was
endothermic.
endoheatic.
endoscopic.
endothermous.
4
This is an example of an exothermic reaction.
hand warmers
baking bread
frying an egg.
burning wood
5
Exothermic reactions
heat their surroundings.
have no effect on their surroundings.
cool their surroundings.
6
During the transition state,
molecules move from place to place.
atoms change into different atoms.
atoms move to new locations.
molecular bonds are broken and reformed.
7
Activation energy
is the energy required to create a reactant.
is the kinetic energy of the reactants.
is the kinetic energy of the products.
is the energy required to start a reaction.
8
All chemical reactions require
hydrogen.
oxygen.
energy.
water.
9
Reactants are the substances
with atoms that have never been bonded.
that never contain hydrogen atoms.
produced at the end of a reaction.
present at the start of a reaction.
10
The energy used during a chemical reaction
can be measured using a calorie counter.
cannot be measured.
can be measured by water pressure.
can be measured using a calorimeter.
11
Choose the correct answer.
correct
incorrect
correct
incorrect
12
According to the conservation of matter principle, reactants provide ___ to create a product.
only a small percentage of the atom used
the only atoms used
the fewest atoms possible
none of their atoms