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Chemical And Physical Changes 2
Test Description: Info about chemical and physical changes
Instructions: Answer all questions to get your test result.
1) What type of chemical reaction releases heat?
A
exothermic
B
endothermic
2) What is the name of the energy needed to start a chemical reaction?
A
potential energy
B
kinetic energy
C
activation energy
3) what type of chemical reaction do you add heat to?
A
endothermic
B
exothermic
4) Reactivity is............
A
how easily elements chemically combine.
B
another name for a proton
C
another name for family 2
D
another name for family 10
5) Family 1 and 17 are very reactive because they are so close to filling their outer valence shell. Family one only needs to get rid of one electron and family 17 only needs to gain one electron.
A
true
B
false
6) Family 18 (the noble gasses) are so stable because they already have a full valence shell.
A
true
B
false
7) Which one is not a item to look for to see if a chemical change has taken place? In other words which one is not part of the chemical changes checklist?
A
light created
B
change in color
C
They are all part of the checklist
D
heat given off
8) Which one is not a item to look for to see if a chemical change has taken place? In other words which one is not part of the chemical changes checklist?
A
they is a change in shape of the matter
B
A new gas is given off
C
They are all part of the checklist
D
there is a temperature change
9) Which one is not a item to look for to see if a chemical change has taken place? In other words which one is not part of the chemical changes checklist?
A
A new substance is made
B
a precipitate is made
C
They are all part of the checklist
D
it is the same material but it has melted
10) Which one is not a item to look for to see if a chemical change has taken place? In other words which one is not part of the chemical changes checklist?.......careful on this one it could be tricky!
A
you see bubbles made
B
a precipitate is made
C
all of these are on the checklist
D
temperature change
11) Although there are many items on the chemoical changes checklist.....what is the only 100% way you can be sure a chemical change has taken place?
A
a change in color
B
heat is given off
C
light is created
D
a new substance is made
*select an answer for all questions
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