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Chemcial Reactions
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What is NaCl?
salt
what type of reaction becomes colder?
endothermic
What side of the arrow would energy or heat be on if the reaction is exothermic?
right (product)
In the reaction methane + oxygen yields carbon dioxide + water, what are the reactants?
methane + oxygen
In the reaction: C3H8 + 5O2 --> 4H2O + 3CO2, how many oxygen atom are on the product side?
10
In a chemical reaction, what are the substances on the right side of the arrow called?
product
Which of the following is NOT evidence of a chemical change? color, temperature, odor, state of matter
state of matter
A change in shape of an object is an example of ____.
physical change
During a combustion reaction, what element must be part of the reactant?
oxygen (O2)
Atoms are not ____ during a chemical reaction according to the law of conservation of mass.
created or destroyed
Energy is needed to break the bonds in a chemical reaction.
true
This is the minimum amount of energy needed for a chemical reaction to occur.
activation energy
All chemical reactions occur at the same rate.
false
Chemical reactions are balanced by changing the subscripts of the molecules.
false
2 atoms of calcium can react to create 6 atoms of calcium.
false
Brennan watched as 2 compounds reacted and changed into 2 different compounds. What type of reaction is this?
double replacement
An experiment has 1 element and 1 compound and ends up with a different element and a different compound. What type of reaction is this?
single replacement
Nate observed an experiment where 1 substance produced 2 substances. What type of a reaction is this?
decomposition
If the arrangement of atoms in a substance changes, chemical properties are the same but physical properties change.
false
Which will burn fastest in open air, a log 2 feet in diameter, or a pile of splinters made from a 2 foot diameter log?
pile of splinters made from a 2 foot diameter log
This is certain proof that a chemical reaction has occurred.
change of chemical properties
This slows down a chemical reaction.
inhibitor
This is something that speeds up a chemical reaction but does not change itself.
catalyst
This is the type of reaction that during a reaction thermal energy is absorbed.
endothermic reaction
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