Science Quiz: Chemistry








1) How many moles of sugar are required to make 4 L of a saturated solution of sugar having a concentration of 0.6 mole per liter?
a) 2.4 moles  
b) 1.2 moles
c) 1.8 moles 
d) 0.6 moles




2) Sugar is not infinitely soluble in water because: 
a) when you mix enough sugar into water the solution eventually solidifies.
b) of the strong attractions that occur between sugar molecules
c) of the strong attractions that occur between water molecules
d) there is only so much space between water molecules for sugar molecules to    fit


3) Covalent and ionic bonds differ in that:
a) ionic bonds don't involve the sharing of electrons
b) covalent bonds are more permanent
c) covalent bonds are much less common
d) ionic bonds are electrical by nature


4) The outer shells of two atoms that are covalently bonded: 
a) cancel each other
b) have increasing capacities for electrons
c) overlap
d) repel


5) The boiling temperature of water is much higher than methane because water molecules are:
a) composed of fewer atoms
b) more massive
c) smaller
d) polar


6) Are there hydrogen bonds between water molecules in the liquid phase? 
a) No, and if there were, the water would just be ice (a solid)
b) Yes, and they are continually breaking and reforming
c) Yes, but they rarely occur
d) No, otherwise the water molecules would not be able to tumble over one another


7) Detergents differ from soaps in that: 
a) their ionically charged heads are derivatives of sulfur
b) they can be broken down by microorganisms
c) detergents are human-made while soaps are produced naturally
d) detergents are less able to penetrate grease than soaps




8) A pH of 7 signifies a solution which is:
a) basic
b) salt
c) acidic
d) neutral


9) How many different isomers are possible for a hydrocarbon with the molecular formula C4H10?
a) 1
b) 2
c) 3
d) 5


10) Which of these contains the carbonyl group?
a) Ketones
b) Aldehydes
c) Esters
d) All of these


ANSWERS :


1=a
2=d
3=a
4=c
5=d
6=b
7=a
8=d
9=b
10=d