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43 questions
A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?
The reaction was a physical change
It is an endothermic reaction
It is an exothermic reaction
Two of the answers are correct
02 (g)+ 2H2-------------2H20 + Energy
endothermic
exothermic
6CO2 + 6H20 + Energy --------------- C6 H12 06 + 6O2
endothermic reaction
exothermic reaction
How many iron (Fe) atoms are in
Fe(NO3)2
1
2
3
6
if more heat energy is released in making bonds in the products than is taken in when breaking bonds in the reactants
Exothermic
Endothermic
Exotermic
Endotermic
Is this diagram endothermic or exothermic
Endothermic
Exotermic
Exothermic
Endote
The Law of Conservation of Matter
tells how many atoms of an element are contained in one molecule or formula unit.
the starting materials in a chemical reaction
the new substances that are formed in a chemical reaction
A law stating that atoms are not created or destroyed during a chemical reaction.
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