Which element has the highest first ionization energy?
1. sodium
2. aluminum
3. calcium
4. phosphorus
4. phosphorus
100
Which compound contains a covalent bond?
1. CaO
2. CO
3. Li2O
4. Al2O3
2. CO
100
A battery consists of which type of cells?
1. electrolytic
2. electrochemical
3. electroplating
4. electromagnetic
2. electrochemical
100
Which gas is monatomic at STP?
1. chlorine
2. fluorine
3. neon
4. nitrogen
3. neon
100
What is the formula for sodium oxalate?
1. NaClO
2. Na2ClO
3. Na2C2O4
4. NaC2H3O2
Na2C2O4
200
According to Reference Table S, which of the following elements has the smallest atomic radius?
1. nickel
2. cobalt
3. calcium
4. potassium
1. nickel
200
Which combination of atoms can form a polar covalent bond?
1. H and H
2. H and Br
3. N and N
4. Na and Br
2. H and Br
200
Given the redox reaction:
2I-(aq) + Br2(l) -> 2Br-(aq) + I2(s)
What occurs during this reaction?
1. The I- ion is oxidized, and its oxidation number increases.
2. The I- ion is oxidized, and its oxidation number decreases.
3. The I- ion is reduced, and its oxidation number increases.
4. The I- ion is reduced, and its oxidation number decreases.
1. The I- ion is oxidized, and its oxidation number increases.
200
What Kelvin temperature is equal to 25°C?
1. 248 K
2. 298 K
3. 100 K
4. 200 K
2. 298 K
200
What is the empirical formula of the compound whose molecular formula is P4O10?
1. PO
2. PO2
3. P2O5
4. P8O20
3. P2O5
300
Which halogens are gases at STP?
1. chlorine and fluorine
2. chlorine and bromine
3. iodine and fluorine
4. iodine and bromine
1. chlorine and fluorine
300
A strontium atom differs from a strontium ion in that the atom has a greater
1. number of electrons
2. number of protons
3. atomic number
4. mass number
1. number of electrons
300
Which type of reaction is occurring when a metal undergoes corrosion?
1. oxidation-reduction
2. neutralization
3. polymerization
4. saponification
1. oxidation-reduction
300
As ice cools from 273 K to 263 K, the average kinetic energy of its molecules will
1. decrease
2. increase
3. remain the same
1. decrease
300
Which is the correct formula for nitrogen (1) oxide?
1. NO
2. N2O
3. NO2
4. N2O3
2. N2O
400
Which set of elements contains a metalloid?
1. Li, Mg, Ca, Kr
2. K, Mn, As, Ar
3. Fr, F, O, Rn
4. Ba, Ag, Sn, Xe
2. K, Mn, As, Ar
400
The electrons in a nonpolar covalent bond are:
1. gained
2. lost
3. shared equally
4. shared unequally
The phase change represented by the equation I2 (s) --> I2 (g) is called
1. sublimation
2. condensation
3. melting
4. boiling
1. sublimation
400
Which of the following is a binary compound?
1. potassium chloride
2. ammonium chloride
3. potassium chlorate
4. ammonium chlorate
1. potassium chloride
500
Atoms of elements in a group on the Periodic Table have similar chemical properties. This similarity is most closely related to the atoms'
1. number of principal energy levels
2. number of valence electrons
3. atomic numbers
4. atomic masses
2. number of valence electrons
500
Which sequence of Group 18 elements demonstrates a gradual decrease in the strength of the Van der Waals forces?
1. Ar, Kr, Ne, Xe
2. Kr, Xe, Ar, Ne
3. Ne, Ar, Kr, Xe
4. Xe, Kr, Ar, Ne
4. Xe, Kr, Ar, Ne
500
What is the oxidation number of carbon in NaHCO3?
1. +6
2. +2
3. -4
4. +4
3. +4
500
solThe heat of fusion is defined as the energy required at constant temperature to change 1 unit mass of a
1. gas to a liquid
2. gas to a solid
3. solid to a gas
4. solid to a liquid
4. solid to a liquid
500
Given the unbalanced equation: Al + O2 = Al2O3 When this equation is completely balanced using the smallest whole numbers, what is the sum of the coefficients?
1. 9
2. 7
3. 5
4. 4