ChemCom
TEST Chapter 1B

1) An atom is the smallest particle of a(n)......
a) compound b) element c) reactant d) electron
2) Covalent bonding, hydrogen bonding and ionic bonding are important in understanding how substances dissolve. In what type of bond are substances made by the attraction of oppositely charge particles ?
a) covalent bonds b) hydrogen bond c) ionic bond d) a,b,c
3) Density compares the ______of substances which have the same ______
a) mass; weight b) volume; mass c) mass: volume d) temperature;
mass e) mass;temperature
4) High surface tension allows water to
a) evaporate easily b) boil at a high boiling point c) float as a solid d) form rain drops e) expand when cooled
5) Suspensions, colloids and solutions are types of
a) mixtures b) compounds c) elements d) pure substances
6) A physical property of a substance
a) can be determined without changing the substance
b) depends on the way a substance reacts
c) are properties that help support life
d) involves breaking the chemical bonds that hold compounds together
e) all of these
7)- 11) Letters may be used more than once. Choose the best answer.
7) positive Tyndall Effect a) colloid
8) no solids will settle out in water b) suspension
9) smallest particles c) solution
10) clear d) colloid and suspension
11) is changed by filtering e) colloid and solution
12) Three of these words are very strongly related. Which is not
a) molecule b) ion c) chemical bond d) compound
13) A change in which old bonds are broken and new bonds are formed,resulting in new substances being produced is called
a) an ion b) distillation c) a chemical reactions d) dissolving
e) filtration
14) Two or more different elements that are bonded in a definite amount are called
a) a mixture b) an ion c) a compound d) a colloid e) a solution
15) Pick the two words which most closely related
a) symbol; equation b) symbol; compound c) formula; reaction
d) formula; compound e) equation; element
16) When do you use a prefix like "di" in naming a compound?
a) all compounds with 2 element b) compounds with 2 elements starting with a metal c) compounds with 2 elements starting with a nonmetal
d) in compounds with more than 2 elements
17) A particle made from 2 or more atoms bonded together is called
a) a molecule b) a compound c) an element d) a mixture
18) In the following example FeO + CO ----> Fe + CO2
______are called the reactants
a)FeO + CO b) FeO only c)Fe + CO2 d) Fe only
19) The polar ends of a water molecule are caused by
a) the atoms neutral charge b) the attraction of oppositely charged ions c) the unequal sharing of bonding electrons d) the other substances mixed in water
20) Atoms, which have become ions, have lost or gained......
a) electrons b) protons c) neutrons d) electrons and protons
21) The substance salt is held together by a bond which results from
a) shared electrons b) attraction of ions c) the same number of charges d) the same number of electrons
22) Water is a polar molecule. Which statement is not related to this fact.
a) Water molecules stick together
b) The oxygen end of water has a negative charge
c) Water is held together by an ionic bond
d) Water has a high boiling point
e) Water has a high surface tension
23) In testing water for ions a reference solution is used to
a) show what happens when the ion is present in the test
b) to show what happens when the ion is not present in the test
c) to make sure the unknown sample contains the ion that is being tested
d) to check to unknown samples for purity
e) to check to see if the control has ions in it
24) When a result in the ion test is negative (no color or precipitate) for a water sample,this means
a) no ion is present
b) not enough reference was used
c) no ion is present or very small amounts of ion may be present
d) the test produced solution but not a colloid
e) the test results produced a suspension
25) What do evaporation and boiling have in common?
a) both require a high temperature to occur
b) both form a gas
c) only surface molecules escape in both
d) both a and c are true
e) a,b and c are all true