Straighterline Chemistry Final- deck 4

What is the reducing agent in the following equation? Mg(s) + 2 HCl(aq) --> MgCl2(aq) + H2(g) a. Mg b. HCl c. H2 d. MgCl2

A. Mg

A complex ion that undergoes a very slow exchange reaction is called an inert complex. Select one: True False

True

A hydrohalic acid is a binary acid containing a halogen. Select one: True False

True

Amphoteric oxides are compounds that exhibit both acidic and basic behavior. Select one: True False

True

Ice is less dense than water due to the formation of hydrogen bonds. Select one: True False

True

In a nuclear reaction elements are converted to other elements. Select one: True False

True

A CH3COOH/CH3COO- buffer can be produced by adding a strong acid to a solution of CH3COO- ions. Select one: True False

True

Increasing the concentrations of the components of a buffer solution will increase the buffer capacity. Select one: True False

True

Indicators are weak acids that are one color in acidic solution and another color in basic solution. Select one: True False

True

The amount of strong acid added to a buffer solution cannot exceed the original amount of conjugate base present in order for the buffer to still work. Select one: True False

True

The empirical formula is the simplest whole number ratio of atoms representing a chemical formula of a molecule. Select one: True False

True

The endpoint in a titration is defined as the point when the appropriate indicator changes color. Select one: True False

True

The endpoint is used to estimate the equivalence point. Select one: True False

True

The maximum oxidation state of an element in the first transition series never exceeds its group number. Select one: True False

True

The molecular formula is a whole number multiple of the empirical formula. Select one: True False

True

The pH of a solution that is 0.20 M CH3COOH and 0.20 M CH3COONa should be higher than the pH of a 0.20 M CH3COOH solution. Select one: True False

True

The systematic name of the coordination compound K2[Co(H2O)2I4] is potassium diaquotetraiodocobaltate(II). Select one: True False

True

There is only one distinct empirical formula for each compound that exists. Select one: True False

True

When a closed-ended manometer is used for pressure measurements, and the closed end is under vacuum, the level of manometer liquid in the closed arm can never be lower than that in the other arm. Select one: True False

True

What is Avogadro's number? Select one: a. the number of atoms in 12g of Carbon-12 b. the number of moles in 12g of Carbon-12 c. the number of molecules in 12g of Carbon-12 d. the number of periods in 12g of Carbon-12

a. the number of atoms in 12g of Carbon-12

The initial volume of a system containing 1 mole of an ideal gas at 292° Kelvin and 3 atm is 8 L. If the gas is cooled at constant volume until the pressure falls to 1.2 atm, then the gas is heated and expanded at constant pressure (1.2 atm) until the volume is 20 L and the temperature is 292° Kelvin, what is the overall work that has been done by the system? Select one: a. -5.29 kJ b. -1.46 kJ c. 3.84 kJ d. 12.78 kJ

b. -1.46 kJ

What is the vapor pressure above a beaker containing a solution of NaCl that is made up of 250ml of water and 12g of NaCl? a. 10.3 mmHg b. 23.4 mmHg c. 35.8 mmHg d. 63.2 mmHg

b. 23.4 mmHg

Most nonmetallic elements are found in which block of the periodic table of elements? Select one: a. s b. p c. d d. f

b. p

Which arrangement accurately describes the standard entropy values for Na at different phases? Select one: a. Na (g) < Na (s) < Na (l) b. Na (l) < Na (g) < Na (s) c. Na (s) < Na (l) < Na (g) d. Na (s) < Na (g) < Na (l)

c. Na (s) < Na (l) < Na (g)

How is the mass number of an element different from its atomic number? Select one: a. The mass number represents the total number of protons in one atom of the element as opposed to the total number of neutrons. b. The mass number represents the total number of electrons in one atom of the element as opposed to the total number of protons. c. The mass number represents the total number of neutrons and protons in one atom of the element as opposed to the total number of protons. d. The mass number represents the total number of neutrons and electrons in one atom of the element as opposed to the total number of neutrons.

c. The mass number represents the total number of neutrons and protons in one atom of the element as opposed to the total number of protons

Ernest Rutherford disproved J.J. Thomson's plum-pudding model of the atom by showing that a. atoms are, in fact, not electrically neutral. b. the atom contains neutrons. c. positive matter is concentrated in the central core. d. electrons are actually greater in mass than protons.

c. positive matter is concentrated in the central core.

Plants use up copious amounts of which alkali metal, preventing most of it from being washed out to sea? a. lithium b. sodium c. potassium d. rubidium

c. potassium

What is the ratio of reactants and products in the chemical equation? NaOH + H2SO4 ==> Na2SO4 + H2O a. 1:1:1:1 b. 2:1:1:1 c. 1:1:1:2 d. 2:1:1:2

d. 2:1:1:2

Which of the following isotopes is likely to be the most stable? Select one: a. F-21 b. Kr-77 c. Po-210 d. Sn-50

d. Sn-50

A face-centered crystal lattice has one atom in the center of the unit cell. Select one: True False

False

A nuclear reaction's reaction rate is affected by temperature, pressure, and catalysts. Select one: True False

False

Ethanol (C2H5-OH) will have a greater viscosity than ethylene glycol (HO-CH2CH2-OH) at the same temperature. Select one: True False

False

For a conjugate acid-base pair, Kw = Ka/Kb Select one: True False

False

For a gas obeying Boyle's law, a plot of V versus 1/P will give a straight line passing through the origin. Select one: True False

False

For real gases, PV > nRT. Select one: True False

False

For stable atoms of elements having low atomic numbers (≤ 20), the neutron-to-proton ratio is close to zero. Select one: True False

False

Gamma rays are high energy electrons. Select one: True False

False

Gases are compressible and have a density that is much higher than liquids and solids. Select one: True False

False

If a strong acid such as HCl is diluted sufficiently with water, the pH will be higher than 7. Select one: True False

False

If the pH of a buffer solution is greater than the pKa value of the buffer acid, the buffer will have more capacity to neutralize added base than added acid. Select one: True False

False

In complexes of transition metals, the maximum coordination number of the metal is equal to its number of d electrons. Select one: True False

False

Increasing the concentrations of the components of a buffer solution will increase the buffer range. Select one: True False

False

Kw = 1.0 × 10-14 under all conditions. Select one: True False

False

Many compounds can be represented with the same empirical formula. Select one: True False

False

Nuclear fission is the process in which a heavy nucleus (mass number > 200) divides to form smaller nuclei of intermediate mass and one or more protons. Select one: True False

False

The correct formula for the dibromobis(oxalato)cobaltate(III) ion is [Co(C2O4)Br2]3+. Select one: True False

False

The energy of a hydrogen bond is greater than that of a typical covalent bond. Select one: True False

False

The maximum number of phases of a single substance which can coexist in equilibrium is two. Select one: True False

False

The rate of diffusion of a gas is inversely proportional to its molar mass. Select one: True False

False

Weak acids have weak conjugate bases. Select one: True False

False