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WorksheetsScience chapter 7
Total questions: 9
Worksheet time: 5mins
chemical Reaction
A process that rearranges the atoms is one or more substances into one or more new substance
a substance that enters the chemical reactions
A substance that is formed during a chemical reactions
number in front of the formula
The minimum energy needed for a chemical reaction to occur
How can you tell whether a chemical change has taken place?
Bubbles
Burning
All of the above
none of the above
Energy released (light or heat)
why are coefficients important
(a)
Synthesis
x+y-->xy
xy-->x+y
xy+z--> z--> zy+x
wx+yz-->wz+yx
xy+z<-->z+xy
Decomposition
x+y-->xy
xy-->x+y
xy+z--> z--> zy+x
wx+yz-->wz+yx
xy+z<-->z+xy
Single replacement
x+y-->xy
xy-->x+y
xy+z--> z--> zy+x
wx+yz-->wz+yx
xy+z<-->z+xy
double replacment
x+y-->xy
xy-->x+y
xy+z--> z--> zy+x
wx+yz-->wz+yx
xy+z<-->z+xy
reverse
x+y-->xy
xy-->x+y
xy+z--> z--> zy+x
wx+yz-->wz+yx
xy+z<-->z+xy
Which of the following is never an evidence of chemical change?
formation of bubbles
change in phase from solid to liquid
change in temperature
produce of order
