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100

State the chemical formula of sodium oxide.

Na2O

100

What is the value of Avogadro's number?

6.02x1023 particles

100

Define Hess Law

the total enthalpy of a reaction is equal to the sum of all the enthalpies of its intermediate reactions

100

How many significant figures are there in 1200.01grams of carbon?

six

200

State the condensed electron configuration of a chlorine atom.

[Ne] 3s2 3p5

200

Calculate the molar mass of Ba(OH)2

171.34 g/mol

200

Given the equation:  

H2(g) + I2(g) ⇋ 2HI(g)      ∆H = -210 kJ/mol

Predict and explain where the reaction must proceed to restore equilibrium if the pressure of the system is increased.

no shift, same amount of moles of R and P

200

Define the term isotope.

Same element, same protons, different neutrons

300

Give 2 random and 2 systematic errors for an enthalpy of combustion experiment.

spills, measurement errors

incomplete combustion, not 100% heat transfer

300

In 30 seconds, balance this: Ca + V2O5 → CaO + V

5 Ca + V2O5 → 5 CaO + 2V

300

State and explain where the reaction must proceed to reach equilibrium when its reaction quotient is 0.05 and its equilibrium constant is 0.005.

reactant side (or left), Kc<Q, must produce more reactants

300

Draw the graph that represents Charles' Law.

positive slope, linear

400

Why is the molecule of chlorine gas, Cl2, classified to be non polar?

even distribution of electrons

400

The scale factor obtained from the empirical formula of C2H2O5 is 3. What is its molecular formula?

C6H6O15

400
Describe the combination of concentration, temperature, particle size, nature of reactants, and catalyst to produce the fastest possible reaction.

high C, high T, low size, high reactivity, presence of catalyst

400

State and explain where equilibrium must shift if the delta H of a reversible reaction is +750kJ and the system is heated up.

right, shift to endothermic so that heat is absorbed

500

State and explain which is more reactive -- nitrogen or oxygen atom.

OXYGEN, more valence electrons, higher electronegativity

500

In a reaction of C + O2 --> CO2, 5 moles of C and 10 moles of O2 are used. Determine which is the limiting reactant by giving the mass of CO2 produced by it.

Carbon is LR and produced 60.05 grams CO2

500

Given that a pure hydrogen gas is under 12000mL, 105kPa, and 35 degrees Celsius, calculate the number of moles present if it follows ideal gas conditions.

0.49 moles

500

Give 2 disturbances that will make the following chemical reaction shift to the left to restore equilibrium according to Le Chatelier's principle.

C + O2 <--> CO2

delta H = -100kJ

add CO2, remove C, remove O2, heat up

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