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- 1. Multiple-choice2 minutes1 pt
Which is the name of the kind of solid substance formed in this figure?aqueousprecipitateacidsynthesis - 2. Multiple-choice2 minutes1 ptWhich of the following compounds will not disassociate in water?NaClPbCl2MgNO3Na2SO4
- 3. Multiple-choice2 minutes1 ptDescribes the number of molecules in a compound and is used to balance a chemical reaction.coefficientsubscriptsuperscriptSI unit
- 4. Multiple-choice2 minutes1 ptWhich type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?double replacementdecompositioncombustionsingle replacement
- 5. Multiple-choice2 minutes1 ptProvides evidence that a chemical reaction has occurred.dissolvingmeltingformation of a gasbending
- 6. Multiple-choice2 minutes1 ptA chemical reaction that shows the formation of a solid and identifies the spectator ionsnet ionic equationdouble replacementionic equationdissociation
- 7. Multiple-choice2 minutes1 ptDescribes the number of atoms in a compound of each element.coefficientsuperscriptsubscriptSI unit
- 8. Multiple-choice2 minutes1 ptThe word oxidation describesgain of electronsloss of electronsnumber of electrons remains the samenumber of electrons transfered
- 9. Multiple-choice2 minutes1 ptThe word reduction describesgain of electronsloss of electronsnumber of electrons remains the sametransfer of electrons
- 10. Multiple-choice2 minutes1 ptWhat are the correct coefficients when this equation is balanced?
KClO3 --> KCl + O22,2,22,2,31,2,33,3,3 - 11. Multiple-choice2 minutes1 ptWhich 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-choice2 minutes1 ptPotassium 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-choice30 seconds1 ptIn a ___________change, a substance changes into a different substance.PhysicalChemical
- 14. Multiple-choice30 seconds1 ptWhich 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-choice30 seconds1 ptIn 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-choice30 seconds1 ptThe 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-choice30 seconds1 ptHow many Al atoms are in this compound? 4Al2O32864
- 18. Multiple-choice30 seconds1 ptHow many F atoms are in this compound?
6MgF226812 - 19. Multiple-choice30 seconds1 pta copper penny turning greenish after a few years.Chemical ChangePhysical Change
- 20. Multiple-choice30 seconds1 ptAn gel ice pack getting cold after you put it in the freezer for an hour.Chemical ChangePhysical Change
- 21. Multiple-choice30 seconds1 ptWhich of the following IS a physical change?Getting a haircutRusty metalsour milkA compound
- 22. Multiple-choice1 minute1 pt___________________ are the elements are compounds that leave (are formed in) a chemical
reaction.PolymersBondsReactantsProducts - 23. Multiple-choice30 seconds1 ptThe smell made from spraying perfume on yourself.Chemical ChangePhysical Change
- 24. Multiple-choice5 minutes1 pt
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-choice5 minutes1 pt
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-choice5 minutes1 pt
How many Carbons are present on the reactant side?
1
2
3
4
- 27. Multiple-choice5 minutes1 pt
How many Hydrogens are on the product side of this chemical equation?
1
2
3
4
- 28. Multiple-choice5 minutes1 pt
How many Oxygens are on the product side of this chemical equation?
1
2
3
4
- 29. Multiple-choice5 minutes1 pt
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-choice5 minutes1 pt
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-choice5 minutes1 pt
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-choice5 minutes1 pt
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-choice5 minutes1 pt
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-choice30 seconds1 ptTrue or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed.truefalse - 35. Multiple-choice30 seconds1 ptA 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-choice30 seconds1 ptThe left side of the equation below is calledProductsReactants
- 37. Multiple-choice30 seconds1 ptThe right side of the equation below is called theproductsreactants
- 38. Multiple-choice30 seconds1 ptWhich 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-choice30 seconds1 ptA 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-choice30 seconds1 ptWhich of the following is NOT a sign of a chemical reaction?Color changesCutting into fourthsLight is producedGas is formed
- 41. Multiple-choice30 seconds1 ptIn 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-choice1 minute1 ptWhich of the following answers will balance the equation below?
__K + __Br2 --> __KBr2, 1, 12, 3, 22, 1, 21, 2, 3 - 43. Multiple-choice2 minutes1 ptIf 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-choice2 minutes1 ptWhich of the following options correctly balances the equation below?
__HNO2 + __O2 --> __HNO34, 1, 41, 2, 11, 2, 12, 1, 2
