Elements, Compounds and Mixtures
after a chemical reaction
Describe in terms of elements, compounds or mixtures what exists before
and after the reaction.
Scan the image for the solution.
The reaction on the right is that of the formation of water according to the reaction below.
Hydrogen + oxygen --> Water
or in chemical terms
2H2 + O2 --> 2H2O
Calcium chloride and hydrogen gas are formed from the reaction between calcium metal and hydrochloric acid react according to the reaction below.
calcium
+ hydrochloric acid--> calcium chloride + hydrogen gas
or in chemical terms
Ca + 2HCl --> H2 + CaCl2
Solution
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Before the reaction takes
place, a mixture exists between an element, calcium metal and a compound,
hydrochloric acid.
After the reaction a mixture exists between an element, hydrogen gas and a compound, calcium chloride.
