General Chemistry Answers

Compare 1.0 mol/L sodium hydroxide with 1.0 mol/L ammonia (written as ammonium hydroxide) by recreating similar diagrams of dissociation and concentration as those provided to you for the acid comparison. Assume ammonia dissociates only 1%. What would you expect to see if you tested the conductivity and pH of each? Why is there a difference in reactivity if there is 1 mole of acid in a given litre?

The mass of a beaker is 5.833 g. After 3.00 mL of a certain pure liquid, is added into the beaker, the combined mass of the beaker and the liquid sample is 8.613 g. From the data, what is the measured density of the liquid?

John used an empty beaker that has a mass of 43.126 g. In a separate jar, he had a mixture of salt and sand. He transferred two scoops of salt and sand mixture to the beaker. The overall mass was 55.449 g. As you know salt is soluble in water, he added enough water to the beaker with salt and sand mixture to completely dissolve the salt. He filtered the mixture and dried what was left in the filter. The mass of that residue was 8.200 g. Based on the experiment calculate:

1. The mass of salt: _____

2. The mass of sand: _____

3. The mass of the mixture (salt + sand): _____

You have 1 m³ of wood and 1 m³ of aluminum. Which is heavier? Prove your answer with calculation.

Q1. Catalase is an important enzyme that breaks down its substrate, H2O2, into water and oxygen in nearly all living cells. The enzyme has k2 = 1.1*107 sec-1 and Km = 2.0 mM. An experiment was set up under the conditions when the reaction rate is independent of [H2O2]. In this experiment, at what concentration of catalase (use SI units and scientific notation) will the reaction have a rate of 850 mM/min?

Q2. The degradation of ethyl acetate (EA) is a first order process with t1/2 = 110 min.

a) Fill in the blank: For this reaction, a graph of _______________ vs. time will give a straight line (linear plot).

b) What is the rate constant for the degradation of EA ?

c) What percentage of EA will remain after 440 minutes?

Imagine a protein molecule compose of 200 glycine molecules and 200 aspartic acid molecules describe how the protein is folded what is in this inside and what is in the outside

if you react 120g of c2h6 with 320g of o2 what is the limiting reagent?

1.   A balloon at a pressure of 5.0 atm contains helium and hydrogen. If the partial pressure of helium is 3.5 atm, what is the partial pressure of hydrogen?

How many moles of KCl are produced from 2.50 moles K ?

A sample of gas at 28.0 °C has a volume of 6.20 L and exerts a pressure of 720.0 mmHg. How many moles of gas are in the sample?