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What reaction has the following general formula:
What type of reaction involves ions from 2 compounds exchanging places to form 2 completely new compounds?
Single Displacement Reaction
Double Displacement Reaction
When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?
a change of color
a change of state
a temperature decrease
a temperature increase
Which phrase describes what happens to atoms in a chemical reaction?
never lost or gained, just rearranged
sometimes lost, never rearranged
sometimes lost, gained, or rearranged
lost or gained, never rearranged
Which of the following is a compound?
sodium chloride (NaCl)
Which of the following chemical equations is balanced?
Ca + 2O2 --> 2CaO2
3Ca + O2 --> 3CaO2
3Ca + 2O2 --> 5CaO2
Ca + O2 --> CaO2