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- 1. Multiple ChoiceNumber of C's in 2Na₂CO₃1235
- 2. Multiple ChoiceThe number of Na's in Na₂CO₃1236
- 3. Multiple ChoiceHow many Elements are in the compound C2H8O ?2130
- 4. Multiple ChoiceHow many Sodium (Na) are in 6NaCl?1126
- 5. Multiple Choice
Does this follow the law of conservation of mass:
3HgO → 2Hg + O2
Yes
No
- 6. Multiple Choice
What are the REACTANTS :
H2O + CO2 → HCO + HO
H2O + CO2
HCO + HO
H2O ONLY
HCO ONLY
- 7. Multiple Choice
Does this follow the law of conservation of mass:
2Fe2O3 + 3C --> 4Fe + 3 CO2
Yes
No
- 8. Multiple ChoiceWhat is the Law of Conservation of mass?Mass is created in a chemical reactionMass is created in a physical changeNew chemicals formed from a chemical reaction have a larger overall mass than the original reactantsMass is never created or destroyed
- 9. Multiple ChoiceThe number in front of a compound or element is aSubscriptCoefficientSuperscriptCharge
- 10. Multiple Choice
How many oxygen atoms are in this chemical formula?
2Fe2O3
6 oxygen atoms
2 oxygen atoms
3 oxygen atoms
4 oxygen atoms
- 11. Multiple ChoiceA chemical reaction is balanced when...Both sides have the same elementsBoth sides have the same number of atoms of each elementBoth sides have the same subscripts for each elementBoth sides have the same coefficients for each compound/molecule
- 12. Multiple ChoiceIf there are 4 H atoms on the reactant side, how many H atoms will be on the product side?246You need more information to answer this question
- 13. Multiple ChoiceWhat is a SUBSCRIPT?The large number next to a moleculeThe small number on the bottom right of an atomThe small number on the top left of an atomThe large number at the end of a molecule
- 14. Multiple ChoiceHow many TOTAL atoms are on the REACTANT side of this equation?
CH4 + 2O2 → CO2 + 2H2O57911 - 15. Multiple ChoiceA jeweler melts gold to make jewelry. As the gold melts, the massincreasesdecreasesis destroyedstays the same
- 16. Multiple ChoiceIf 10 grams of water are added to 5 grams of salt, how much salt water will be made?2 grams5 grams10 grams15 grams
- 17. Multiple ChoiceIf reaction starts with 20g of reactants it should producea total of 40g of productsa total of 10g of productsa total of 80 g of productsa total of 20g of products
- 18. Multiple Choice
What type of reaction?
4Si + S8 --> 2Si2S4
Synthesis
Decomposition
Single displacement
Double displacement
- 19. Multiple Choice
What type of reaction?
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
Synthesis
Decomposition
Single diplacement
Double displacement
- 20. Multiple Choice
What type of reaction?
2Pb(NO3)2 --> 2PbO + 4NO2 + O2
Synthesis
Decomposition
Single displacement
Combustion
- 21. Multiple Choice
What type of reaction?
3Mg + N2 --> Mg3N2
Synthesis
Decomposition
Single displacement
Combustion
- 22. Multiple Choice
What type of reaction?
2NO2 --> N2 + 2O2
Synthesis
Decomposition
Single displacement
Combustion
- 23. Multiple Choice
What type of reaction?
2Fe + 3H2SO4 --> Fe2(SO4)3 + 2H2
Synthesis
Decomposition
Single displacement
Combustion
- 24. Multiple ChoiceWhich chemical reaction breaks down into 2 substances?Double ReplacementSingle ReplacementSynthesisDecomposition
- 25. Multiple Choice
What type of reaction?
Fe + H2SO4 --> Fe2(SO4)3 + H2
Synthesis (combination)
Decomposition
Single replacement
Combustion
- 26. Multiple Choice
A reaction that gives off heat is...
Exothermic
Endothermic
- 27. Multiple Choice
A reaction where more energy is released when the bonds of the products are formed than it takes to break the bonds of the reactants. Example: An explosion
Exothermic reaction
Endothermic reaction
- 28. Multiple Choice
Two Reactants and One Product
Decomposition
Synthesis
Combustion
Single Replacement
- 29. Multiple ChoiceAlways starts with a hydrocarbon that reacts with oxygen and produces carbon dioxide and water.DecompositionSynthesisCombustionSingle Replacement
- 30. Multiple Choice
What type of reaction?
KOH + H3PO4 --> K3PO4 + H2O
Synthesis (combination)
Decomposition
Single replacement
Double replacement
- 31. Multiple ChoiceIn a cold pack, which type of reaction draws heat from the surroundings?exothermicendothermicexergonic
- 32. Multiple ChoiceDuring an exothermic reaction, what happens to energy in relation to the surroundings?released toabsorbed frommixed with
- 33. Multiple ChoiceDuring an endothermic reaction, what happens to energy in relation to the surroundings?released toabsorbed frommixed with
- 34. Multiple Choice
Photosynthesis is a chemical reaction that involves the production of glucose (sugar) from carbon dioxide and water in the presence of sunlight. So sunlight (energy) is needed for the reaction to occur! Photosynthesis is what kind of reaction?
exothermic
endothermic
decomposition
- 35. Multiple Choice
Does the following equation following the Law of Conseration of Mass? (Balanced?)
2 AlBr3 + 3 K2SO4 --> 4 KBr + 1 Al2(SO4)3
No
Yes
- 36. Multiple Choice
Which does NOT happen when vinegar and baking soda react?
bubbles are present
a solid forms
the reaction feels cool
carbon dioxide gas is produced
- 37. Multiple Choice
What type of reaction is shown?
Synthesis
Decomposition
Single Displacement
Double Displacement
- 38. Multiple ChoiceWhat type of reaction occurs in a hand warmerexothermicendothermic
- 39. Multiple ChoiceHave you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?It is an exothermic reactionIt is an endothermic reactionIt is made of iceIt is dissolving your mouth
- Answer choicesTagsAnswer choicesTags