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Chemical Reactions (Chapter 5)

Name:________________________
Class: ___________ Date: ________
Across
An exothermic reaction is one that ______ energy.
Concentration is the amount of a substance in a given _______.
The new substances formed by a chemical change are called _______.
A coefficient is placed in _____ of a chemical formula in an equation.
A ______ increases the rate of the reaction by lowering the activation energy.
A change in ______ may be a sign of a new substance forming and a chemical change taking place.
A biological catalyst is called a/an ________.
A decomposition reaction occurs when compounds ______ down into simpler products.
Increasing the temperature will increase the _____ of the reaction.
To balance a chemical equation, we use numbers called ________.
The law of conservation states that during a chemical reaction, matter is not _______ or destroyed.
A material used to decrease the rate of a reaction is a/an _______.
Chemical changes occur when existing _____ break and new ______ form. (same word in both blanks)
The starting materials before the chemical change are called _______.
Increasing the surface area of a reactant will _______ the rate of the reaction.
An endothermic reaction is one that _______ energy.
Down
A replacement reaction is when one element _____ another element in a compound.
A chemical _______ is a way to show a chemical reaction, using symbols instead of words.
Smaller pieces of reactant increases its _________ area.
Changes in the _______ of matter, such as melting, freezing and boiling are physical changes.
When two or more elements or compounds combine to make a more complex substance, the reaction is classified as ______.
The formation of a gas from a chemical reaction may be seen as _________.
When vinegar reacts with baking soda, the gas formed is carbon _______.
Increasing the concentration of the ________ will increase the rate of the reaction.
A solid that forms from liquids during a chemical reaction is called a _______.
An example of a decomposition reaction is hydrogen peroxide breaking down into ______ and oxygen gas.
A chemical change is called a chemical _______.
A _______ change does not change the substance into another substance.
All the ______ present at the start of the reaction are present at the end of a reaction.
Activation energy is the minimum amount of energy needed to ____ a chemical reaction.