4U CHEM EXAM (MC)

0.0(0)
studied byStudied by 0 people
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/27

flashcard set

Earn XP

Description and Tags

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

28 Terms

1
New cards
The minimum amount of energy required to overcome the energy barrier in a chem rxn is…
Activation energy.
2
New cards
An active complex is a chemical species that is…
Unstable and has high P.E.
3
New cards
The presence of a catalyst is thought to increase the rate of reaction by…
Decreasing the activation energy of the rxn.
4
New cards
Ineffective collisions are collisions that involve particles…
That rebound from the collisions unchanged.
5
New cards
If a rxn can be broken down into a rxn mechanism, then the steps of the rxn are known as…
Elementary steps.
6
New cards
The number of particles that usually collide in an elementary step are…
1-2
7
New cards
Kinetic Energy is…
The energy of motion.
8
New cards
Enthalpy is an expression for…
Energy content.
9
New cards
Tempurature means…
The average kinetic energy of molecules.
10
New cards
Specific heat capacity means…
The heat required to raise the tempurature of 1 gram by 1C.
11
New cards
What physical state or nitrogen has the highest entropy?
Gas.
12
New cards
A chemical system in which neither matter nor energy can flow into or out of the system is described as…
An isolated system.
13
New cards
What is the best observable evidence that equilibrium has been established?
Macroscopic properties appear to be constant.
14
New cards
A system comes to equilibrium. What do we know for sure?
Rate of forward rxn = rate of reverse rxn.
15
New cards
If the equilibrium constant is increased by temp change, concentrations of ____ will…
Products increase and reactants decrease.
16
New cards
The equilibrium constant can be changed by…
Changing the tempurature.
17
New cards
Adding a catalyst to equilibrium while keeping temp constant will….
Increase the rate of both forward and reverse rxns.
18
New cards
What releases hydrogen ions in aqueous solutions?
An Arrhenius acid
19
New cards
Brønsted-Lowry-Lowry says that an acid is a substance that can…
Donate protons while in solutions.
20
New cards
The conjugate base of a weak acid is a….
Weak base.
21
New cards
A buffer solution will…
Resist large changes in pH when a strong acid or base is added.
22
New cards
An orbital is best described as…
A figure that indicates where one would find electrons 95% of the time.
23
New cards
Intermolecular forces are…
Attractive forces between 2 covalent molecules.
24
New cards
Potassium chloride dissolved in pure water is an example of…
An ionic compound dissolved in polar solution.
25
New cards
The main attractive forces between most polar molecules is…
Dipole-dipole
26
New cards
A good solvent for polar molecules like HCL is…
Water
27
New cards
Metals are generally better conductors than non metals because…
Valence electrons in metals are more mobile.
28
New cards
Water has a higher boiling point than hydrogen sulphide because…
Water has stronger intermolecular attractions