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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
endothermic
B
exothermic
2) What is the name of the energy needed to start a chemical reaction?
A
kinetic energy
B
activation energy
C
potential 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
false
B
true
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
They are all part of the checklist
B
change in color
C
heat given off
D
light created
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
there is a temperature change
D
They are all part of the checklist
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
They are all part of the checklist
B
it is the same material but it has melted
C
A new substance is made
D
a precipitate is made
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
temperature change
B
a precipitate is made
C
all of these are on the checklist
D
you see bubbles made
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
light is created
B
a change in color
C
heat is given off
D
a new substance is made
*select an answer for all questions
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