Question
The following volume-temperature plots were made at different values of constant pressure while the number of moles of gas in each experiment remained the same. Which plot represents measurements at the highest pressure? a. A b. B c. C d. D c. They are all at the same pressure. It is relatively easy to change the temperature of a substance that a. is very massive. b. is an insulator. c. has a high specific heat capacity. d. has a low specific heat capacity. e. is brittle. In Bohr's atomic theory, when an electron moves from one energy level to another energy level more distant from the nucleus. a. energy is absorbed. b. light is emitted. c. energy is emitted. d. no change in energy occurs. e. none of these In general, atomic radii a. decrease from left to right in a period and increase down a group. b. increase from left to right in a period and decrease down a group. c. do not change across a period or a group. d. decrease from left to right and decrease down a group. e. increase from left to right in a period and increase down a group. Which of the following concerning electronegativity is/are correct? Differences in element electronegativities may be used to predict the type of bonding, ionic or covalent, in a substance. The larger the differences in electronegativity between two bonded atoms the more polar the bond. The electrons in a polar bond tend to spend more time around the least electronegative element. a. 1 only b. 2 only c. 3 only d. 1 and 2 e. 1, 2, and 3 What is the molecular geometry around an atom in a molecule or ion which is surrounded by two lone pairs of electrons and four single bonds. a. square pyramidal b. square planar c. octahedral d. tetrahedral e. trigonal bipyramidal
Explanation / Answer
5) A
6) d
7) a
8) a
Atomic size increases down a group due to increase in principalquantum number i.e shell number.
9) d
10) b
According to VSEPR theory, the gemetry of AB4L2 type molecule is square planar
