Suppose you calculated a value for ΔHvap for water that was 3% above the accepted value, which of the following is the most likely reason for the difference?

What explains the phenomenon that a 10.0 m NaCl(aq) does not have twice the effect of 10.0 m sucrose(aq) on lowering the freezing point of water, while a 0.0100 m NaCl(aq) does have twice the effect of a 0.0100 m sucrose(aq) solution on lowering the freezing point of water.

Indicate what kind of solution you will have upon adding each of the salts below to their own separate vials of pure water. NaCH3COO: [solution1] NaOH: [solution2] NaCl: [solution3] HCl: [solution4] NH4Cl: [solution5] KNO3: [solution6]

Question 1.3.1   The picture below shows an electrical circuit. This electrical circuit consists of a buzzer and a switch.   Draw a diagram of the circuit by using the correct symbols.   Click on the button below to open the picture of the electrical circuit.   Upload Image Here (3)

How many particles per formula unit will be produced when the soluble ionic compound BaCl2 is dissolved in water?

Question 2.4   What do all vertebrates have in common? a.  They breathe with lungs. b.  They have four legs. c.   They live on land. d.  They have a backbone. (1)

Question 1.4.1   The pictures below show six ways of providing energy. Use these pictures to answer the following questions.   Coal Fire Turbine Petrol Generator Gas Boiler Solar Panel Wave Turbine    Click on the button below to open the picture of the energy sources.   From the drawings above, give the name of two fossils fuels. 1. [ans1] 2. [ans2] (2)

Question 5.6   Explain how adaptation may lead to evolution. What is this process know as? (2)

How many pure-strategy equilibria are present in this game?  

Jesse, Gus and Walter decide to play a game. Each of them put $100 in a pool, and they all get to toss a quarter. Jesse wins if the coins land all heads or all tails. Gus wins if two heads and one tail land, and Walter wins if one head and two tails land. The quarters are fair (each side is equally likely), and the winner receives a net payment of $200 ($300 – $100 = $200), and the losers lose their $100. What is Walter’s expected payoff? Round your answer to the nearest first decimal.