Unit 4: Intro to chemical reactions and writing chemical equations notes

chemical change happens when___?

new substances are formed and the identity of the substance changes

in order for chemical changes to occur bonds have to be____ and then formed____.

broken, formed

Are chemical changes easy to reverse?

No

What are 4 examples of chemical changes?

change in color, heat transfer, gas production, and when a solid is formed

the chemical reactons happening before the arrow sign are called ___?

reactants

the chemical reactions happening after the arrow sign are called ____?

products

the arrow between chemical reactons usualy stands for _____.

"yields" or "produces"

what do the coefficents in the chemical equations tell us?

They tell us the ratios between

how many states of matter are there in chemical equations?

4

what is the ag state of matter

agueous

what does agueous mean?

ions dissolved in water

acids are always ____ solutions?

agueous

pure metals are always _____?

solid