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Chemistry cumulitive exam review
Terms in this set (22)
Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium?
lithium + oxygen -> lithium oxide (B)
Which of the following do Lewis structures help us understand?
the number of electrons that are involved in the bonding of the molecule (B)
According to Le Chatelier's principle, a change in pressure affects the chemical equilibrium of the reaction system under what condition?
Some of the reactants or the products are in the gaseous phase.
Which compound most likely contains polar covalent bonds?
Which is a correct comparison between the modern quantum model and John Dalton's model of the atom?
The modern model recognizes particles in the atom, whereas Dalton's model does not.
Iron reacts with oxygen to form iron oxide (rust). Which best describes this statement?
Iron oxide is formed by rearranging atoms.
Which is a property of covalent compounds?
They have a low boiling point.
At equilibrium at 600 K, the following are true.
[CO2] = 9.5 x 10-4 M
[H2] = 4.5 x 10-2 M
[H2O] = 4.6 x 10-3 M
[CO] = 4.6 x 10-3 M
What is the value of the equilibrium constant for this reaction in correct scientific notation?
4.9 x 10-1
The mole ratio of zinc to zinc sulfate is
In a chemical reaction, substance R reacts with compound XY to produce 47.0 g of compound RX. If the theoretical yield of RX is 56.0 g, what is its percent yield?
What is the mole ratio of PCl3 to PCl5?
A student writes the following statements about the relationship between mass defect and nuclear binding energy.
1. When an isotope's protons and neutrons come together to form a nuclide, a small amount of mass is converted to energy.
2. An equivalent amount of energy must be added to the nuclide to split apart its protons and neutrons.
3. Statement 1 describes the isotope's nuclear binding energy, and statement 2 describes the isotope's mass defect.
Which statement is correct?
1 and 2 only (C)
What is the theoretical yield of H2O if 130 g of H2O is produced from 18 g of H2 and an excess of O2?
A chemist who is performing this reaction starts with 160.1 g of NH4NO3. The molar mass of NH4NO3 is 80.03 g/mol; the molar mass of water (H2O) is 18.01 g/mol. What mass, in grams, of H2O is produced?
Which best describes the trends in electronegativity on the periodic table?
Electronegativity increases up and to the right.
Juana performs the calculation below.
6.05 + 3.156 + 5.0
How should she report the answer using the correct number of significant figures?
What is the value of all conversion factors that are used in dimensional analysis?
What does it mean that valence electrons in a metal are delocalized?
The valence electrons move between atoms in shared orbitals.
What is the predicted order of first ionization energies from highest to lowest for lithium (Li), sodium (Na), potassium (K), and rubidium (Rb)?
Li > Na > K > Rb
Which statement describes heterogeneous mixtures?
They are made up of two or more pure substances that are not chemically bonded together.
Which type of bonding involves the complete transfer of a valence electron from a less electronegative atom to a more electronegative one?
ionic bonding (A)
How are isotopes defined?
forms of the same element that differ in the number of neutrons in each atom
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