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Science 9 Chapter 4 Online Test

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

1. 
The forces that hold different atoms or ions together are
A.
electric currents.
C.
physical bonds.
B.
chemical bonds.
D.
nuclear forces.
 

2. 
A mixture is different from a compound because each substance in a mixture
A.
retains its own properties.
C.
forms an ion.
B.
changes its electric charge.
D.
changes from a solid to a liquid.
 

3. 
A compound differs from a mixture because it
A.
always remains frozen even at high temperatures.
B.
is formed from two cations.
C.
always contains the same elements in the same proportion.
D.
can form only in the presence of heat energy.
 

4. 
Each molecule of hydrochloric acid, HCl, contains one atom of hydrogen and
A.
one atom of chlorine.
C.
two atoms of chlorine.
B.
one atom of oxygen.
D.
two atoms of oxygen.
 

5. 
Each molecule of table sugar, C12H22O11, contains
A.
0 atoms of carbon.
C.
6 atoms of carbon.
B.
1 atom of carbon.
D.
12 atoms of carbon.
 

6. 
Which compound is formed from a tight network of oppositely charged ions?
A.
sugar, C12H22O11
C.
water, H2O
B.
quartz, SiO2
D.
salt, NaCl
 

7. 
In which substance do the molecules have the strongest attractions to one another?
A.
sugar, a solid
C.
sulfuric acid, a liquid
B.
hydrogen, a gas
D.
water, a liquid
 

8. 
Gases take up a lot of space because
A.
they have weak chemical bonds.
B.
their molecules have very little attraction for one another.
C.
they contain very few atoms.
D.
they have a small molar mass.
 

9. 
Often atoms join so that each atom will have
A.
an even number of electrons.
B.
an outermost energy level that is full of electrons.
C.
an equal number of protons and electrons.
D.
more electrons than either protons or neutrons.
 

10. 
The bonds that hold atoms together behave most like
A.
snap-together blocks.
C.
rubber cement.
B.
glue.
D.
flexible springs.
 

11. 
When two hydrogen atoms bond, the positive nucleus of one atom attracts the
A.
negative nucleus of the other atom.
C.
negative electron of the other atom.
B.
positive electron of the other atom.
D.
positive nucleus of the other atom.
 

12. 
An ionic bond is a bond that forms between
A.
ions with opposite charges.
B.
atoms with neutral charges.
C.
one atom's nucleus and another atom's electrons.
D.
the electrons of two different atoms.
 

13. 
Covalent bonds are formed between
A.
ions.
C.
nonmetal atoms.
B.
metal atoms.
D.
compounds.
 

14. 
In a metallic bond, the nucleus of one atom is attracted by a nearby atom's
A.
nucleus.
C.
energy structure.
B.
negative ion.
D.
electrons.
 

15. 
Copper is a good conductor of electricity because its electrons
A.
are positively charged.
B.
are free to move from atom to atom.
C.
can take on either positive or negative charges.
D.
are shared between neighboring compounds.
 

16. 
Solid ionic compounds have very high melting points because they
A.
are positively charged.
B.
contain metallic elements.
C.
are made of elements that are solid at room temperature.
D.
contain charged ions that are locked tightly together.
 

17. 
In which type of bond do atoms share electrons?
A.
covalent bonds
C.
ionic bonds
B.
metallic bonds
D.
polyatomic bonds
 

18. 
The anion formed from an oxygen atom is called a(n)
A.
oxygen ion.
C.
carbon dioxide.
B.
oxide ion.
D.
nitrous oxide.
 

19. 
The name dinitrogen tetroxide tells you that this compound contains
A.
two nitrogen atoms and two oxygen atoms.
B.
four nitrogen atoms and two oxygen atoms.
C.
two nitrogen atoms and four oxygen atoms.
D.
four nitrogen atoms and four oxygen atoms.
 

20. 
Fe2O3 is named iron(III) oxide because it contains
A.
three oxygen atoms.
C.
three iron atoms.
B.
Fe3+ ions.
D.
O3+ ions.
 

21. 
When copper combines with oxygen to form copper(II) oxide, the charge of the copper ion is
A.
Cu1+.
C.
Cu3+.
B.
Cu2+.
D.
Cu4+.
 

22. 
When nickel combines with fluorine to form nickel(III) fluoride, the charge of the nickel ion is
A.
Ni1+.
C.
Ni3+.
B.
Ni2+.
D.
Ni4+.
 

23. 
The name for the compound with the formula CuBr2 would be written as
A.
copper(II) bromide.
C.
copper bromine.
B.
copper(I) bromide.
D.
copper(III) bromide.
 

24. 
The name for the compound with the formula Cr2O3 would be written as
A.
chromium(I) oxide.
C.
chromium oxygen.
B.
chromium(II) oxide.
D.
chromium(III) oxide.
 

25. 
It is possible for different covalent compounds to have the same empirical formula because empirical formulas represent
A.
a total of all ionic bonds.
C.
a model of the compound.
B.
only the cations in the compound.
D.
a ratio of atoms in the compound.
 

26. 
Formaldehyde, CH2O, and acetic acid, C2H4O2, have the same empirical formula but different
A.
kinds of cations.
C.
kinds of atoms.
B.
kinds of anions.
D.
molecular formulas.
 

27. 
A carbon atom can bond to four other atoms because it has
A.
four different cations.
C.
two inner energy levels.
B.
four valence electrons.
D.
no protons in its nucleus.
 

28. 
The simplest organic compound is
A.
aspirin.
C.
salt.
B.
table sugar.
D.
methane.
 

29. 
Alkanes are hydrocarbons that contain
A.
single covalent bonds only.
C.
carbon and oxygen only.
B.
single or double covalent bonds.
D.
carbon, hydrogen, and oxygen.
 

30. 
Alcohols are organic compounds that contain
A.
carbon and oxygen only.
C.
carbon, oxygen, and hydrogen.
B.
carbon and hydrogen only.
D.
carbon, nitrogen, and hydrogen.
 

31. 
Polymers are large organic molecules that are made of
A.
cations.
C.
carbon and oxygen only.
B.
anions.
D.
repeating units.
 

32. 
Which compounds have carbon-carbon double bonds?
A.
alkanes
C.
alcohols
B.
alkenes
D.
ionic compounds
 

33. 
A protein is a polymer that is made of
A.
simple sugars.
C.
amino acids.
B.
nitrogen and carbon dioxide.
D.
DNA.
 

34. 
The "rungs" of the DNA "ladder" are made up of
A.
paired monomers.
C.
phosphates.
B.
sugar molecules.
D.
amino acids.
 

35. 
Some polymers are elastic because they are made of
A.
carbon.
C.
sugar and alcohol.
B.
phosphate ladders.
D.
cross-linked chains.
 

Completion
Complete each sentence or statement.
 

36. 
The chemical formula H2O means a water molecule contains one ____________________ for every two ____________________.
 

 

37. 
The melting and boiling points of quartz are very high because of the compound's ____________________.
 

 

38. 
Atoms bond in compounds when their ____________________ interact.
 

 

39. 
When atoms form bonds and fill their outermost energy levels, they have an electronic arrangement similar to that of a(n) ____________________.
 

 

40. 
When two chlorine atoms bond, they ____________________ a pair of electrons.
 

 

41. 
A(n) ____________________ bond is formed when atoms share ____________________ of electrons.
 

 

42. 
Most covalent compounds have relatively ____________________ melting points.
 

 

43. 
Because polyatomic ions are made of covalently bonded atoms that have either gained or lost electrons, they behave like simple ____________________.
 

 

44. 
The charge of each titanium ion in the ionic compound TiO2 is ____________________.
 

 

45. 
The charge of each iron ion in the ionic compound FeS is ____________________.
 

 

46. 
The chemical formula for the ionic compound consisting of oxide ions and nickel(III) ions is ____________________.
 

 

47. 
The chemical formula for the ionic compound consisting of nitride ions and titanium(III) ions is ____________________.
 

 

48. 
The simplest formula for a covalent compound is its ____________________ formula.
 

 

49. 
In addition to carbon, organic compounds almost always contain ____________________.
 

 

50. 
When a compound is made of only carbon and hydrogen atoms it is called a(n) ____________________.
 

 

51. 
____________________ are compounds that have repeating subunits.
 

 

52. 
Both starches and sugars are made of the elements ____________________, ____________________, and ____________________.
 

 

53. 
DNA can ____________________ itself because it is made of two strands that can be separated.
 

 



 
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