General Questions and Answers

At a certain temperature, the equilibrium constant K for the following reaction is 4.76 × × 10¹¹: Br₂(g) + OC1₂(g) → BrOCI(g) + BrCl(g) Use this information to complete the following table. Suppose a 16. L reaction vessel is filled with 0.40 mol of BrOCI and 0.40 mol of BrCl. What can you say about the composition of the mixture in the vessel at equilibrium? What is the equilibrium constant for the following reaction? Be sure your answer has the correct number of significant digits. BrOCI(g) +BrCl(g) Br₂(g) + OCl₂(g) What is the equilibrium constant for the following reaction? Be sure your answer has the correct number of significant digits. 2 Br₂(g) +20C1₂(g) 2 BrOCI(g) +2BrCl(g) There will be very little Br₂ and OCI2. O There will be very little BrOCI and BrCl. O Neither of the above is true. K = 0 K = 0

4Fe (s) + 302 (g) → 2Fe2O3 (s) When 25.75 g of O2 react with excess Fe, and this is the only reaction which occurs, theoretically how many grams of Fe2O3 should be produced? Keep the answer with 2 decimal places. Do not write unit in answer.

A helium filled balloon has a volume of 2.3 L, a temperature of 25 °C, and a pressure of 17.3 psi. How many grams of helium does the balloon contain. 6.5 g 0.44 g 0.11 g 5.2 g

Name the following compounds or Figure out the formula: MgF2 Ca(OH)2 TiBr4 HCI

What were Dalton's four ideas about atoms/compounds?

The reaction C4H8(g) → 2C₂H4(g) has an activation energy of 262 kJ/mol. At 600.0 K, the rate constant, k, is 6.1 x 10-8 s-¹. What is the value of the rate constant : 870.0 K?

Which of the following is/are synthesis reactions? 1. 1CH4 (g) +2O₂ (g) --> 1CO₂ (g) + 2H₂(l) 2. 1 Ca(s) + 1CO₂ (g) --> 1 CaCO3 (s) 3. 2Mg(s) + 1O₂ (g) --> 2Mg(s) 4. 1PbCO3 (s)--> 1Pb(s) + 1CO₂ (g) a 4 only b 2 and 3 c all are synthesis d 2, 3, and 4

Label if each is lonic, Covalent, or Both NH3 Na3PO4 K₂S H₂SO4

3a) Write a balanced molecular equation for the following reaction. Ba(NO3)2(aq) + Li₂CO3(aq) → b) Write a complete ionic equation for the reaction you have written above. c) Identify the spectator ions d) Write the net ionic equation for the above reaction.

2) Write equations to show dissociation for the following compounds: FeCl3 K₂SO4 Li3PO4 NH4OH

A particular reactant decomposes with a half-life of 143 s when its initial concentration is 0.255 M. The same reactant decomposes with a half-life of 225 s when its initial concentration is 0.162 M. Determine the reaction order. 0 2 1 What is the value and units of the rate constant for this reaction?.

6. Refer to Technique 16B. a. Remove the drop suspended from a pipet tip by... b. The finger used to control the delivery of liquid from a pipet is the . . . c. What should be done with the last bit of liquid remaining in the pipet after delivery? d. Most pipets are calibrated as TD 20°C. Define TD; what is its meaning regarding the volume of liquid a pipet delivers?

The reaction A+B --> C+D rate= K[A][B]2 initial rate: has an initial rate of 0.0650 M/s. What will the initial rate be if [A] is halved and [B] is tripled? initial rate: What will the initial rate be if [A] is tripled and [B] is halved?

A bone is found in an ancient African cave and tested out at only 10% of its original amount of carbon-14. Estimate the age of the bone if the half- life of carbon-14 is about 5700 years. A bone is found in an ancient African cave and tested out at only 10% of its original amount of carbon-14. Estimate the age of the bone if the half-life of carbon-14 is about 5700 years. Decay Model: M = Moe"

Distinguish between molecules, formula units and atoms. Write an example of each.

Write a nuclear equation for the following: Plutonium-239 Phosphorus-32 Cesium-137