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Question 1:  The answer is A.  When you mix baking soda (which is a "base") with vinegar (which is an "acid") the resulting mixture gives off a gas called carbon dioxide.  Think about it like this:  acids and bases are like two friends who are so totally different that when they get together, they always fight!  In science, this is called a "reaction." 

Question 2:  The answer is C.  When you shake up a can of soda, the molecules in the stuff inside bang together and create a gas.  This gas takes up more space than the liquid, and builds up pressure inside the can.  When there is too much gas for the can to hold, the can will explode (just like if you blew up a balloon too much)!

Question 3:  The answer is B.  Soap can be both a solid (like a bar of soap) and a liquid.  When you add water to the bar of soap, the soap and water combine to make liquid soap.

Question 4:  The answer is C.  Unlike some other liquids, oil and water cannot be combined into a single solution. It might look like they are combining if you stir them together really well, but when you let the mixture sit for a while, the two liquids will separate out again.

Science Riddle:  I'm water!  Water is solid when it is frozen, liquid when it melts, and a gas when it boils and evaporates.  How cool is that??!!

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