In a chemical reaction, heat is either .... or .....
absorbed or released
100
A shorter, easier way to show a chemical reaction, using symbols instead of words, is called a...
chemical equation
100
2 atoms of hydrogen and 1 atom of oxygen produce water. What type of reaction is this?
synthesis
200
Is ice melting into water an example of a chemical change?
physical change
200
During an endothermic reaction, energy is ....
absorbed
200
The combination of symbols that represent the elements in a compound, including their ratios.
chemical formula
200
When a compound breaks down into more than one simpler formula, it is a ........ reaction.
decomposition
300
A solid that forms during a chemical reaction
precipitate
300
During an exothermic reaction, energy is...
released
300
A number in a chemical equation that is in front of a chemical formula, and applies to each element in the formula
coefficient
300
This type of reaction is where two compounds react with each other to create at least two new compounds.
replacement
400
The only sure evidence of a chemical change is
a new substance is created
400
What is an example of an endothermic reaction?
answers vary (teacher's discretion)
400
A number in a chemical equation that follows an element, applies only to the element it follows and represents the ratio of that element in the chemical formula.
subscript
400
Is this balanced?
See board
500
According to the conservation of mass, during a chemical reaction, matter is not.... or....
created or destroyed
500
What is an example of an exothermic reation?
answers vary (teacher's discretion)
500
Describe the organization of a chemical equation
reactant + reactant --> product
500
What are 3 of the 5 factors that determines the rate of chemical reaction?
temperature, concentration, surface area, catalyst and inhibitor.
500
What are 3 of the 5 factors that affect the rate of a chemcial reaction?