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- 1. Multiple-choice30 seconds1 ptWhich generalized equation represents a decomposition reaction?A + BC → AC+ BA + B → ABAB → A + B
- 2. Multiple-choice30 seconds1 ptIn a cold pack, which type of reaction draws heat from the surroundings?exothermicendothermicexergonic
- 3. Multiple-choice30 seconds1 ptPhotosynthesis 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-choice30 seconds1 pt
What reaction has the following general formula:
Combination
Decomposition
Single Replacement
Double Replacement
Combustion
- 5. Multiple-choice5 minutes1 pt
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-choice5 minutes1 pt
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-choice30 seconds1 ptWhat does (aq) mean in a chemical reaction?Agsilveraqualiriousaqueous
- 8. Multiple-choice30 seconds1 pt
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-choice30 seconds1 ptAt 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-choice30 seconds1 pt
Which of the following is a compound?
zinc (Zn)
magnesium (Mg)
sodium chloride (NaCl)
potassium (K)
- 11. Multiple-choice1 minute1 ptWhen balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balancedchargesubscriptrandom numbercoefficient
- 12. Multiple-choice1 minute1 ptBalance this equation:
__Li + __Cl2 -> __LiCl2Li + Cl2 -> 4LiCl22Li + Cl2 -> LiCl22Li + Cl2 -> 2LiCl - 13. Multiple-choice30 seconds1 pt
Which of the following chemical equations is balanced?
Ca + 2O2 --> 2CaO2
3Ca + O2 --> 3CaO2
3Ca + 2O2 --> 5CaO2
Ca + O2 --> CaO2
- 14. Multiple-choice30 seconds1 ptIons in two compounds switch.SynthesisCombustionSingle ReplacementDouble Replacement
- 15. Multiple-choice15 minutes1 ptA different chemical substance is formed when _____.water boilsmetal rustsice meltsrock is crushed
