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- 1. Multiple Choice
Which is the name of the kind of solid substance formed in this figure?aqueousprecipitateacidsynthesis - 2. Multiple ChoiceWhich of the following compounds will not disassociate in water?NaClPbCl2MgNO3Na2SO4
- 3. Multiple ChoiceDescribes the number of molecules in a compound and is used to balance a chemical reaction.coefficientsubscriptsuperscriptSI unit
- 4. Multiple ChoiceWhich type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?double replacementdecompositioncombustionsingle replacement
- 5. Multiple ChoiceProvides evidence that a chemical reaction has occurred.dissolvingmeltingformation of a gasbending
- 6. Multiple ChoiceA chemical reaction that shows the formation of a solid and identifies the spectator ionsnet ionic equationdouble replacementionic equationdissociation
- 7. Multiple ChoiceDescribes the number of atoms in a compound of each element.coefficientsuperscriptsubscriptSI unit
- 8. Multiple ChoiceThe word oxidation describesgain of electronsloss of electronsnumber of electrons remains the samenumber of electrons transfered
- 9. Multiple ChoiceThe word reduction describesgain of electronsloss of electronsnumber of electrons remains the sametransfer of electrons
- 10. Multiple ChoiceWhat are the correct coefficients when this equation is balanced?
KClO3 --> KCl + O22,2,22,2,31,2,33,3,3 - 11. Multiple ChoiceWhich half reaction shows the element being reduced. In the following reaction.
2Na + Cl2 --> 2NaClNa0 --> Na+1 + 1e-Cl20 + 2e- --> 2Cl-Na0 + 1e- --> Na+1Cl20 --> 2Cl- + 2e- - 12. Multiple ChoicePotassium iodide is a catalyst in a chemical reaction where would this be placed when writing the chemical reaction?product sidereactant sideabove the arrowleft out
- 13. Multiple ChoiceIn a ___________change, a substance changes into a different substance.PhysicalChemical
- 14. Multiple ChoiceWhich of these is NOT a sign that a chemical change has occurred?A loss of transparencyAn unexpected color changeA temperature changeThe formation of a precipitate
- 15. Multiple ChoiceIn a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?ReactantsProductsAtomsCatalysts
- 16. Multiple ChoiceThe Law of Conservation of Mass statesthat matter exists in all states and reacts the samethat matter can only be changed into new substances by introducing a catalystthat matter exists in the same state throughout any chemical changethat matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
- 17. Multiple ChoiceHow many Al atoms are in this compound? 4Al2O32864
- 18. Multiple ChoiceHow many F atoms are in this compound?
6MgF226812 - 19. Multiple Choicea copper penny turning greenish after a few years.Chemical ChangePhysical Change
- 20. Multiple ChoiceAn gel ice pack getting cold after you put it in the freezer for an hour.Chemical ChangePhysical Change
- 21. Multiple ChoiceWhich of the following IS a physical change?Getting a haircutRusty metalsour milkA compound
- 22. Multiple Choice___________________ are the elements are compounds that leave (are formed in) a chemical
reaction.PolymersBondsReactantsProducts - 23. Multiple ChoiceThe smell made from spraying perfume on yourself.Chemical ChangePhysical Change
- 24. Multiple Choice
Which of the following 2 are chemical reactions?
sugar dissolving in water
water turning into steam
burning wood
mixing baking soda and vinegar
tearing paper
- 25. Multiple Choice
A chemical change is different than a physical change because in a chemical change
chemicals are used
molecules do not physically touch
a new substance is formed and in a physical no new substance is formed
the change can be seen but in a physical change it cannot
- 26. Multiple Choice
How many Carbons are present on the reactant side?
1
2
3
4
- 27. Multiple Choice
How many Hydrogens are on the product side of this chemical equation?
1
2
3
4
- 28. Multiple Choice
How many Oxygens are on the product side of this chemical equation?
1
2
3
4
- 29. Multiple Choice
Why are chemical equations always balanced? Select ALL that apply.
Matter cannot be created.
Matter cannot be destroyed.
Matter can only be rearranged/conserved.
Matter doesn't matter.
- 30. Multiple Choice
In a chemical reaction, if the reactants are heated, the reaction usually happens
slower
faster
at the same rate
in a smaller volume
- 31. Multiple Choice
Some chemical reactions require a substance called a catalyst. The purpose of a catalyst is
to warm up the reaction
to speed up the reaction
to create more reactants
to stop the reaction
- 32. Multiple Choice
What does it mean for a reaction to be exothermic? Choose 2 of the following.
When two substances react, the temperature of the mixture decreases.
When two substances react, the temperature of the mixture increases.
There is less energy going into the reactant to break the bond than there is energy leaving the product.
There is more energy going into the reactant to break the bond than there is energy leaving the product.
The amount of energy entering and leaving is the same.
- 33. Multiple Choice
Is this chemical equation balanced? Why or why not? Choose the BEST answer.
Yes, the amount of atoms for each element are equal on both the reactant and product side.
No, the carbons are not the same number on both the reactant and product side.
No, neither the carbons or hydrogens are the same amount on both the reactant and product side.
No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.
- 34. Multiple ChoiceTrue or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed.truefalse - 35. Multiple ChoiceA chemical change is different than a physical change because in a chemical changeChemicals are usedMolecules do not physically touchA new substance is formed and in a physical change no new substance is formedThe change can be seen but in a physical change it cannot
- 36. Multiple ChoiceThe left side of the equation below is calledProductsReactants
- 37. Multiple ChoiceThe right side of the equation below is called theproductsreactants
- 38. Multiple ChoiceWhich statement is not a description of a chemical reaction?A solid is dropped into a beaker of liquid and a gas is released.Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.A solid is dropped into a beaker of liquid and an explosion occurs.A liquid is heated in the sun and half of it evaporates.
- 39. Multiple ChoiceA number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.Coefficientreactantsubscriptproduct
- 40. Multiple ChoiceWhich of the following is NOT a sign of a chemical reaction?Color changesCutting into fourthsLight is producedGas is formed
- 41. Multiple ChoiceIn a chemical reactionThe atoms of the reactants always stay together to form the productsThe atoms of the reactants unbond, rearrange, and then rebond to form the productsNew atoms are formed which combine to make the productsSome atoms disappear while others multiply to form the products
- 42. Multiple ChoiceWhich of the following answers will balance the equation below?
__K + __Br2 --> __KBr2, 1, 12, 3, 22, 1, 21, 2, 3 - 43. Multiple ChoiceIf the reactants on the left side of a chemical equation are C₃H₈ + 5O₂, the products in a balanced equation could be4CO₂ + 3H₂O3CO₂ + 4H₂O2CO₂ + 3H₂O3CO + 4H₂O
- 44. Multiple ChoiceWhich of the following options correctly balances the equation below?
__HNO2 + __O2 --> __HNO34, 1, 41, 2, 11, 2, 12, 1, 2 - Answer choicesTagsAnswer choicesTags