Changes
Pure/Mixture
Elements
Acids and Bases
Density/Ionic/Molecular
100
Ice melting is an example of physical or chemical change?
What is physical
100
Is salt pure or a mixture?
What is pure
100
What is the atomic number for nitrogen?
What is 7
100
A pH of 2 would be considered a strong ___________.
What is an acid
100
If an object floats on water, is the object more or less dense than water?
What is less dense
200
A fire burning is an example of physical or chemical change?
What is chemical
200
Is air pure or a mixture?
What is a mixture
200
What is the atomic mass for oxygen?
What is 16
200
A pH of 9 would be considered a weak ________.
What is a base
200
If an object sinks, it is because the solution is more dense or the object?
What is the object
300
Sugar dissolving in water is what type of change?
What is physical
300
What are the two types of pure substances
What is elements and compounds
300
How many electrons does sodium have?
What is 11
300
If blue litmus paper turns red then the solution is a _________
What is an acid
300
What must an ionic compund contain?
What is a metal
400
What are two properties of a physical change?
What is it can be reversed, no new substances is created, state change
400
GIve an example of three mixtures
What is ...
400
How many protons does boron have?
What is 5
400
If blue litmus paper stays blue then the solution could be what two things?
What is a base or neutral
400
Molecular compounds contain two or more ______________.
What is non-metals
500
What are three pieces of evidence a chemical cahnge has occurred?
What is a new substance is produced, gas produced, odor produced, color change ect.
500
Give an example of three pure substances
What is ....
500
How many neutrons does fluorine have?
What is 10
500
If red litmus paper stays red then the solution could be what two things?
What is an acid or neutral
500
Do ionic or molecualr compunds conduct electricty?
What is ionic
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