Unit 4: Intro to chemical reactions and writing chemical equations notes
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13 Terms
1
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chemical change happens when___?
new substances are formed and the identity of the substance changes
2
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in order for chemical changes to occur bonds have to be____ and then formed____.
broken, formed
3
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Are chemical changes easy to reverse?
No
4
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What are 4 examples of chemical changes?
change in color, heat transfer, gas production, and when a solid is formed
5
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the chemical reactons happening before the arrow sign are called ___?
reactants
6
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the chemical reactions happening after the arrow sign are called ____?
products
7
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the arrow between chemical reactons usualy stands for _____.
"yields" or "produces"
8
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what do the coefficents in the chemical equations tell us?
They tell us the ratios between
9
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how many states of matter are there in chemical equations?
4
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what is the ag state of matter
agueous
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what does agueous mean?
ions dissolved in water
12
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acids are always ____ solutions?
agueous
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pure metals are always _____?
solid