Balancing Equations and Types of Reactions Quiz

Bonding, Naming, & Rxns Review Test

Some questions were taken from http://www.phschool.com/atschool/chemistry/PH/Student_Area/PHCHEM_SC7_ST_index.html

Elements, cmpds, & mixtures

38) A substance that is composed entirely of one type of atom and has a uniform distribution of particles is called a

a. compound

b. element

c. solution

d. homogeneous mixture

40) A substance that contains two or more elements chemically combined in a fixed proportion is called

a. compound

b. elements

c. homogeneous mixture

d. solution

42) Which of the following is NOT an example of an element?

a) copper pan

b) iron nail

c) neon gas

d) bronze

Balancing & Types of rxns

43. A chemical reaction is a process in which

a. reactants change into products

b. the law of conservation of matter applies.

c. substances with new properties are formed.

d. all of the above

44. What are the reactants in the following chemical equation:

Zn + CuSO4 à ZnSO4 + Cu

a. Zn & Cu

b. Zn & CuSO4

c. ZnSO4 & Cu

d. Zn only

45. In order for a successful bond to occur between two atoms they must both obtain

a. equal numbers of valence electrons

b. full sets of valence electrons

c. different numbers of valence electrons

d. incomplete sets of electrons

46. What happens to the bonds between atoms in a compound that undergoes a chemical reaction?

a. All single bonds become double bonds.

b. Existing bonds are broken & new ones form.

c. Bonds between atoms are unaffected.

d. They do the Irish jig.

47. In a chemical reaction, the total mass of a substance before the reaction is

a. equal to the total mass of the substances after the reaction.

b. usually smaller than the total mass of the substances after the reaction.

c. usually greater than the total mass of the substances after the reaction.

d. sometimes greater & sometimes smaller after the reaction.

48. Which of the following types of reactions involves one element replacing an ion from another compound?

a. decomposition

b. double displacement

c. single displacement

d. synthesis

Balance each of the following chemical equations. Then identify the type of chemical reaction.

49. synthesis 2O2 + N2 à N2O4

50. decomposition 2NaF à 2Na + F2

51. double replacement 2NaI + Pb(NO3)2 à 2NaNO3 + PbI2

52. decomposition Li3PO4 à 3Li + P + 2O2

53. single replacement CS2 + 2F2 à CF4 + 2S

54. synthesis 2NH3 + H2S à (NH4)2S