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- 1. Multiple ChoiceWhich generalized equation represents a decomposition reaction?A + BC → AC+ BA + B → ABAB → A + B
- 2. Multiple ChoiceIn a cold pack, which type of reaction draws heat from the surroundings?exothermicendothermicexergonic
- 3. Multiple ChoicePhotosynthesis is a chemical reaction that involves the production of glucose (sugar) from carbon dioxide and water in the presence of sunlight. Photosynthesis is what kind of reaction?ExothermicEndothermicDecomposition
- 4. Multiple Choice
What reaction has the following general formula:
Combination
Decomposition
Single Replacement
Double Replacement
Combustion
- 5. Multiple Choice
What type of reaction involves ions from 2 compounds exchanging places to form 2 completely new compounds?
Single Displacement Reaction
Double Displacement Reaction
Synthesis Reaction
Decomposition Reaction
- 6. Multiple Choice
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
- 7. Multiple ChoiceWhat does (aq) mean in a chemical reaction?Agsilveraqualiriousaqueous
- 8. Multiple Choice
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
- 9. Multiple ChoiceAt the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?the product is doubledthe product is half the mass of the reactantsthe mass is the samethe mass changes depending on the reaction
- 10. Multiple Choice
Which of the following is a compound?
zinc (Zn)
magnesium (Mg)
sodium chloride (NaCl)
potassium (K)
- 11. Multiple ChoiceWhen balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balancedchargesubscriptrandom numbercoefficient
- 12. Multiple ChoiceBalance this equation:
__Li + __Cl2 -> __LiCl2Li + Cl2 -> 4LiCl22Li + Cl2 -> LiCl22Li + Cl2 -> 2LiCl - 13. Multiple Choice
Which of the following chemical equations is balanced?
Ca + 2O2 --> 2CaO2
3Ca + O2 --> 3CaO2
3Ca + 2O2 --> 5CaO2
Ca + O2 --> CaO2
- 14. Multiple ChoiceIons in two compounds switch.SynthesisCombustionSingle ReplacementDouble Replacement
- 15. Multiple ChoiceA different chemical substance is formed when _____.water boilsmetal rustsice meltsrock is crushed
- Answer choicesTagsAnswer choicesTags