4U CHEM EXAM (MC)
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28 Terms
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The minimum amount of energy required to overcome the energy barrier in a chem rxn is…
Activation energy.
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An active complex is a chemical species that is…
Unstable and has high P.E.
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The presence of a catalyst is thought to increase the rate of reaction by…
Decreasing the activation energy of the rxn.
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Ineffective collisions are collisions that involve particles…
That rebound from the collisions unchanged.
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If a rxn can be broken down into a rxn mechanism, then the steps of the rxn are known as…
Elementary steps.
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The number of particles that usually collide in an elementary step are…
1-2
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Kinetic Energy is…
The energy of motion.
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Enthalpy is an expression for…
Energy content.
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Tempurature means…
The average kinetic energy of molecules.
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Specific heat capacity means…
The heat required to raise the tempurature of 1 gram by 1C.
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What physical state or nitrogen has the highest entropy?
Gas.
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A chemical system in which neither matter nor energy can flow into or out of the system is described as…
An isolated system.
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What is the best observable evidence that equilibrium has been established?
Macroscopic properties appear to be constant.
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A system comes to equilibrium. What do we know for sure?
Rate of forward rxn = rate of reverse rxn.
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If the equilibrium constant is increased by temp change, concentrations of ____ will…
Products increase and reactants decrease.
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The equilibrium constant can be changed by…
Changing the tempurature.
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Adding a catalyst to equilibrium while keeping temp constant will….
Increase the rate of both forward and reverse rxns.
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What releases hydrogen ions in aqueous solutions?
An Arrhenius acid
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Brønsted-Lowry-Lowry says that an acid is a substance that can…
Donate protons while in solutions.
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The conjugate base of a weak acid is a….
Weak base.
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A buffer solution will…
Resist large changes in pH when a strong acid or base is added.
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An orbital is best described as…
A figure that indicates where one would find electrons 95% of the time.
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Intermolecular forces are…
Attractive forces between 2 covalent molecules.
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Potassium chloride dissolved in pure water is an example of…
An ionic compound dissolved in polar solution.
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The main attractive forces between most polar molecules is…
Dipole-dipole
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A good solvent for polar molecules like HCL is…
Water
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Metals are generally better conductors than non metals because…
Valence electrons in metals are more mobile.
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Water has a higher boiling point than hydrogen sulphide because…
Water has stronger intermolecular attractions
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Flashcards (34)