Chemistry Cumulative Exam questions
and answers | Verified
A sample of propane (C3H8) has a mass of 0.47 g. The sample is burned in a bomb
calorimeter that has a mass of 1.350 kg and a specific heat of 5.82 J/(g • °C). How
much energy is released by the reaction if the temperature of the calorimeter rises by
2.87°C? - ANSWER 22.5 kJ
Which statement is true about crystal lattice energy? - ANSWER It is a measure of the
strength of the bonds between ions.
Which of the following best describes a pair of elements that will form an ionic bond? -
ANSWER Ca and Br: Calcium easily loses electrons, and bromine gains them.
Which statement explains how the bands in the crystal of a metal are like atomic
orbitals? - ANSWER They both allow electrons to move from lower energy levels to
higher energy levels.
, Lillian multiplies two numbers as follows: A B = C. Given that A has five significant
figures and two decimal places and B has six significant figures and four decimal
places, which equals the number of significant figures in C? - ANSWER five
Which is the formula mass of Na2SO4? - ANSWER 142.05 amu
Which type of reaction is C12H22O11 → 12C + 11H2O? - ANSWER combustion
An element has five valence electrons available for bonding. This element is most likely
which of the following? - ANSWER phosphorus
Consider the balanced equation below.
N2H4 + 2H2O2 N2 + 4H2O
What are the mole ratios of hydrazine (N2H4) to hydrogen peroxide (H2O2)
and hydrazine to water? - ANSWER 1:2 and 1:4
The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2)
to form magnesium oxide (MgO).2Mg + O2 2MgOThe molar mass of O2 is 32.0 g/mol.
What mass, in grams, of O2 is required to react completely with 4.00 mol of Mg? -
ANSWER 64.0
Two students are given different samples of a substance and are instructed to
determine the properties of the substance.Which statement describes a property that
and answers | Verified
A sample of propane (C3H8) has a mass of 0.47 g. The sample is burned in a bomb
calorimeter that has a mass of 1.350 kg and a specific heat of 5.82 J/(g • °C). How
much energy is released by the reaction if the temperature of the calorimeter rises by
2.87°C? - ANSWER 22.5 kJ
Which statement is true about crystal lattice energy? - ANSWER It is a measure of the
strength of the bonds between ions.
Which of the following best describes a pair of elements that will form an ionic bond? -
ANSWER Ca and Br: Calcium easily loses electrons, and bromine gains them.
Which statement explains how the bands in the crystal of a metal are like atomic
orbitals? - ANSWER They both allow electrons to move from lower energy levels to
higher energy levels.
, Lillian multiplies two numbers as follows: A B = C. Given that A has five significant
figures and two decimal places and B has six significant figures and four decimal
places, which equals the number of significant figures in C? - ANSWER five
Which is the formula mass of Na2SO4? - ANSWER 142.05 amu
Which type of reaction is C12H22O11 → 12C + 11H2O? - ANSWER combustion
An element has five valence electrons available for bonding. This element is most likely
which of the following? - ANSWER phosphorus
Consider the balanced equation below.
N2H4 + 2H2O2 N2 + 4H2O
What are the mole ratios of hydrazine (N2H4) to hydrogen peroxide (H2O2)
and hydrazine to water? - ANSWER 1:2 and 1:4
The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2)
to form magnesium oxide (MgO).2Mg + O2 2MgOThe molar mass of O2 is 32.0 g/mol.
What mass, in grams, of O2 is required to react completely with 4.00 mol of Mg? -
ANSWER 64.0
Two students are given different samples of a substance and are instructed to
determine the properties of the substance.Which statement describes a property that
