1. The element aluminum melts at 660oC. Express this temperature in Kelvins.
2. The element lead melts at 328oC. Express this temperature in degrees Fahrenheit
3. A substance melts at –5oC and boils at 19oC. At room temperature, about 23oC, which of these statements must be true?
(a) The substance is an element
(b) The substance has an indefinite volume
(c) The substance is a liquid
(d) The substance is a compound
4. Which set of terms describes a chocolate chip cookie?
(a) mixture, heterogeneous, matter
(b) matter, compound, homogeneous
(c) compound, heterogeneous, solid
(d) homogeneous, matter, mixture
5. When gasoline is burned in an automobile engine
(a) energy is created
(b) chemical potential energy is transformed
(c) energy is destroyed
(d) none of these
6. Burning coal is an example of:
(a) an exothermic process
(b) an endothermic process
(c) a physical change
7. Correctly round off the answer to this calculation:
(a) 21.62 g/mL
(b) 21.6 g/mL
(c) 22 g/mL
(d) 2 x 101 g/mL
8. How many milligrams is 25kg?
9. What is the volume of 344 g of ice if the density of ice is 0.92 g / mL?
(b) 316 mL
(c) 2.67x10-3 mL
(d) 37.4 mL
10. What is the final temperature of an 87.0 gram iron bar initially at 31oC that absorbs 4.90x103 cal of heat energy? The specific heat of iron is 0.110 cal / (g oC)
11. A glass of milk is poured from a full one-gallon container of milk. The milk in the glass when compared with the milk in the container has
(a) a different specific heat
(b) the same heat capacity
(c) a lower heat capacity
(d) a higher heat capacity
12. How many protons, neutrons and electrons (in that order) are in chlorine:
(a) 18, 17, 18
(b) 17, 18, 17
(c) 17, 18, 18
(d) 17, 35, 17
13. Two different isotopes of silicon would have different
(a) mass numbers
(b) atomic masses
(c) numbers of neutrons
(d) all of these
14. The atomic mass of magnesium is 24.3 amu because:
(a) each magnesium atoms has a mass of 24.3 amu
(b) there are at least two isotopes of magnesium in nature
(c) there are atoms of magnesium with different number of protons
(d) both b and c
15. We would expect the electron configuration of oxygen to show two unpaired electrons according to
(a) the Pauli exclusion principle
(b) Bohr’s rule
(c) the Aufbau principle
(d) Hund’s rule
16. The maximum number of electrons in the 2p energy sublevel is:
17. Which of the following is not part of modern atomic theory?
(a) atoms of different elements can combine only in certain ratios in forming compounds
(b) atoms of the same element all have the same number of protons
(c) atoms of one element are changed into atoms of another by chemical reaction
(d) all elements are composed of atoms
18. Ionization energy is the energy required to remove an electron from a gaseous atom.
(a) This process results in the formation of an anion.
(b) Ionization energy increases moving down a group on the periodic table.
(c) Ionization energy increases moving from left to right across a period on the periodic table.
(d) All of these.
19. Which group of elements have these properties: malleable, ductile, solid at room temperature?
(b) alkaline earth metals
(c) noble gases
20. The periodic law states that there is a periodic repetition of the physical and chemical properties of elements:
(a) when they are arranged in order of increasing atomic mass
(b) if only metals are considered
(c) when they are arranged in order of increasing atomic radii
(d) when they are arranged in order of increasing atomic number
(a) Using empty boxes to represent elements. Draw the first five periods of the periodic table. You do not need to fill in the elements that belong in each box.
(b) Place a “b” in the box in the periodic table you drew above corresponding to the element with the electron configuration 1s22s22p63s23p64s23d2
(c) Place a “c” in the box in the periodic table you drew above corresponding to the element with the electron configuration 1s22s22p63s1
(d) Label the group of the periodic table you drew above corresponding to the electron configuration ns2np5