Chemistry Answers

Suppose 100ml of a 0.2 M ZnCl2 solution is mixed with 300ml of 0.1 KNO3. What is the pH?

1. How many grams of Lactic acid (C₆H₁₀O₅) should be dissolved in 650g of cyclohexane (C₆H₁₂) to raise the boiling point to 84.91⁰C? The normal boiling point of cyclohexane is 81⁰C and its molal boiling point is 2.75 ⁰C/m.

A piece of aluminum with a mass of 30 grams was heated in a steam jacket to 98 oC and then plunged into 120 grams of water at 9 oC, causing the temperature to rise to 13.5 oC. What is the specific heat of aluminum

An ice cube of mass 65 g is taken from a freezer at -15

oC and dropped into 125 cm3 of water at

85

oC. What will be the final temperature of the mixture? The specific heat of ice is 0.5 cal/g.oC

and latent heat of fusion of ice is 80 cal/g.

In an experiment designed to measure the heat of fusion of ice, 25 grams of ice at 0

oC is

dropped into 200 grams of water at 30

oC contained in a copper calorimeter of mass 100 g. The

final temperature is 17.5

oC. What value of the heat of fusion do this value yield? Specific

heat of copper = 0.0931 cal/gC

o

. (10

What would happen if the temperature of the sample at point B of the phase diagram of water is decreased at constant pressure?

Write the dynamic model in eqn. 1 in terms of the deviation variables 0*(t), q*(t), and 0*(t)

if 8.4 moles of H2 is combined with 4.2 moles of o2 what is the excess reagent

Hypothesis 1: What will happen if you will slowly sprinkle starch on a glass of water?

Hypothesis 2: How does the movement of a marble differ on Water vs. Oil?

Hypothesis 4: Which will boll faster, a salt solution or a pure water?

Hypothesis 5: Which will vaporize faster between alcohol and water?

What is half-wave potential? How is it related to standard reduction potential