Chemical And Physical Changes 2 Question Preview (ID: 49054)


Info About Chemical And Physical Changes. TEACHERS: click here for quick copy question ID numbers.

What type of chemical reaction releases heat?
a) endothermic
b) exothermic
c)
d)

What is the name of the energy needed to start a chemical reaction?
a) potential energy
b) activation energy
c) kinetic energy
d)

what type of chemical reaction do you add heat to?
a) endothermic
b) exothermic
c)
d)

Reactivity is............
a) another name for family 10
b) another name for family 2
c) how easily elements chemically combine.
d) another name for a proton

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
c)
d)

Family 18 (the noble gasses) are so stable because they already have a full valence shell.
a) true
b) false
c)
d)

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) heat given off
c) change in color
d) They are all part of the checklist

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 gas is given off
b) they is a change in shape of the matter
c) there is a temperature change
d) They are all part of the checklist

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) it is the same material but it has melted
d) They are all part of the checklist

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) you see bubbles made
c) a precipitate is made
d) all of these are on the checklist

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

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