EXAM 1
What is the correct prefix for the multiplier 1,000? (EXAM I CH 1-4)
A) Mega.
B) Milli.
C) Micro.
D) Nano.
E) None of the above
E) None of the above
Which of the following statements about chemical formulas is FALSE? (EXAM II CH 5-8)
A) The subscripts represent the relative number of each type of atom in the compound.
B) The subscripts represent the relative mass of each type of atom in the compound.
C) The subscripts do not change for a given compound.
D) Different compounds made of the same elements have different subscripts.
E) All of the statements are true
B) The subscripts represent the relative mass of each type of atom in the compound.
Which of the following elements has the lowest ionization energy? (EXAM III CH 9-11)
A) Rb
B) Na
C) C
D) F
E) He
A) Rb
The correct number of significant figures in the number 1.250100 is: (EXAM I CH 1-4)
A) 5
B) 7
C) 4
D) Ambiguous
E) None of the above.
B) 7
Which of the following is a heterogeneous mixture? (EXAM I CH 1-4)
A) Milk
B) Sugar water
C) Raisin bran
D) Air
E) None of the above
C) Raisin bran
How many total atoms are in the formula Al2(CO3)3? (EXAM II CH 5-8)
A) 8
B) 9
C) 12
D) 14
D) 14
What happens to the volume of a gas when you double the number of moles of gas while keeping temperature and pressure constant? (EXAM III CH 9-11)
A) The volume is halved.
B) The volume doubles.
C) The volume decreases, but more information is needed.
D) The volume increases, but more information is needed.
B) The volume doubles.
A 0.500L balloon at sea level is submerged to a depth where pressure increases. What happens to its volume? (EXAM III CH 9-11)
A) Increases
B) Decreases
C) Stays the same
D) None of the above.
B) Decreases
A pure substance is: (EXAM I CH 1-4)
A) Composed of two or more types of atoms in variable proportions.
B) Composed of only one type of atom or molecule.
C) Composed of two or more regions with different compositions.
D) None of the above.
B) Composed of only one type of atom or molecule.
What is the name of Ca(NO3)2? (EXAM II CH 5-8)
A) Calcium dinitrite
B) Calcium nitrate
C) Calcium nitride
D) Calcium nitrite
B) Calcium nitrate
How many electrons are in the p-subshell of a ground-state nitrogen atom? (EXAM III CH 9-11)
A) 1
B) 2
C) 3
D) 4
E) 6
C) 3
Which reaction produces CO2 and H2O as products? (EXAM II CH 5-8)
A) Precipitation reaction.
B) Combustion reaction.
C) Gas evolution reaction.
D) Oxidation-reduction reaction.
B) Combustion reaction.
The number of protons in the nucleus of an atom: (EXAM I CH 1-4)
A) Is called the atomic number.
B) Is given the symbol "Z."
C) Identifies the atom as a particular element.
D) Is the same for all isotopes of an element.
E) All of the above
E) All of the above
How many moles of Cu are in 1.48×10 ^25 Cu atoms? (EXAM II CH 5-8)
A) 0.0408
B) 24.6
C) 1.54×10^25
D) 6.022×10^23
E) None of the above
B) 24.6
Which molecule has a polar covalent bond? (EXAM III CH 9-11)
A) NaCl
B) H2O
C) H2
D) All of the compounds
E) None of the compounds.
E) None of the compounds.
What is the theoretical yield in grams if a reaction produces 75 g of product and the actual yield is 42 g? (EXAM II CH 5-8)
A) 56%
B) 31.5%
C) 178%
D) 42%
A) 56%
How many joules are in a 255 calorie snack bar? (EXAM I CH 1-4)
A) 2.55×10^5
B) 1.07×10^6
C) 1.07×10^3
D) 6.09×10^4
C) 1.07×10^3
What is the mass percent of iron in an ore containing 242 grams of iron in a 500-gram sample? (EXAM II CH 5-8)
A) 93.7%
B) 48.4%
C) 51.6%
D) 32.6%
E) None of the above.
B) 48.4%
The Lewis structure for carbon monoxide shows: (EXAM III CH 9-11)
A) 4 lone pairs and 1 bonding pair.
B) 4 lone pairs and 3 bonding pairs.
C) 2 lone pairs and 3 bonding pairs.
D) None of the above.
C) 2 lone pairs and 3 bonding pairs.
Which of the following compounds is soluble in water? (EXAM II CH 5-8)
A) Copper carbonate
B) Calcium carbonate
C) Potassium carbonate
D) Strontium carbonate
E) None of the above.
C) Potassium carbonate