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- 1. Multiple Choice
In an endothermic reaction, heat is ...taken in or absorbedgiven out or released - 2. Multiple ChoiceBaking bread and cooking an egg are examples of....?Endothermic processesExothermic processessNone of these
- 3. Multiple ChoiceExothermic reactions...Absorb energyRelease energyRelease ColorAbsorb Color
- 4. Multiple Choice
When does a chemical reaction stop?
When the lab is finished
When the excess reactant is used up
When the limiting reactant is used up
Chemical reactions never stop
- 5. Multiple ChoiceWhat is essential for a combustion reaction to begin?Carbon dioxideFuelFuel, oxygen and heatWater and oxygen
- 6. Multiple ChoiceWhich of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O34Fe + 3O2 -> 2Fe2O32 Fe + 3O2 -> Fe2O64 Fe + O6 -> 2Fe2O3None of the options are correctly balanced. - 7. Multiple ChoiceBalance this equation...
HgO --> Hg + O2It is balanced2HgO --> Hg + O22HgO --> 2Hg + O2I don't know...Oh well! - 8. Multiple ChoiceIce meltingChemical ChangePhysical Change
- 9. Multiple ChoiceWhat happens in ALL chemical changes?Change in state of matterA new substance is formedBubbles are producedAn explosion
- 10. Multiple ChoiceIs the following equation balanced or unbalanced?
Fe + S --> FeSbalancedunbalanced - 11. Multiple Choice
In reactions, products must be equal to..
Products
Reactants
Starters
Enders
- 12. Multiple ChoiceWater can dissolve many things so it is called the .....wonderful watercohesionliquiduniversal solvent
- 13. Multiple Choicea solute whose water solution conducts electricity is called a(n)nonconductorelectrolytenonelectrolyteaqueous solution
- 14. Multiple ChoiceThe thing that does the dissolvingSoluteSolventColloidSolution
- 15. Multiple ChoiceWhat is a solute?The substance that does the dissolving in a solution.The substance that is dissolved into the solution.The mixing of different substances.The process in which neutral molecules lose or gain electrons
- 16. Multiple Choice
According to the law of conservation of mass, how does the amount of each element on the product side compare to each element on the reactant side?
The amount of atoms on each side is equal
The amount of atoms on the product side is greater
The amount of atoms on the reactant side is greater
Depends on the reaction
- 17. Multiple ChoiceWhich of the following describes a precipitate?a liquid forms when a block of metal is heateda solid forms when one liquid is poured into anothera gas forms when a solid is placed in a liquidbubbles form when an acid is poured on a rock
- 18. Multiple Choice
Balance the following chemical equation:
____KClO3 → ____KCl + ____O2
2KClO3 → 4KCl + O2
4KClO3 → 2KCl + 3O2
2KClO3 → 2KCl + 3O2
- 19. Multiple Choice
Which reaction type is the following:
C5H10 + O2 --> CO2 + H2O
Decomposition
Synthesis
Complete Combustion
Double Replacement
- 20. Multiple ChoiceIn chemical reactions, what does the principle of conservation of mass mean?Matter is not created or destroyed.The total mass of the reactants is greater than the total mass of the products.The total mass of the reactants is less than the total mass of the products.Matter is not changed.
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