General Chemistry Answers

What is the pH of a solution containing an [H⁺] concentration of 2.75*10^-3?

Question 4:

E + 2 F --> 2 G + 4 D 

The rate law for the above reaction is 

O third order 

O second order 

O first order 

O k[G]2[D]4

O impossible to find without experimental data

Question 5:

A first order reaction is found that 20% of the sample A has decomposed in 100 seconds. 

(i) Find the value for the rate constant (include units) 

(ii) What is the half-life of this reaction (include units) 

If the reaction is 2nd order and has an initial concentration of 0.200 M 

(iii) Find the value of the rate constant (include units)

(iv) What is the half-life of this reaction (include units)

Question 6:

1) HBr + Oz <=> HOOBr 

2) HOOBr+ HBr > 2 HOBR 

3) HOBR + HBr <=> H;O + Brz 

4) HOBR + HBr<> H;O + Br2 

(i) If the first step is the slow step, what is the rate law for the reaction? 

(ii) If the slow step is the second step, what is the rate law for the reaction?

Two blocks of mass 0.1 kg and 0.2 kg approach each other on a horizontal plane at velocities of 0.4 and 1 m/s respectively. If the blocks collide and remain together, calculate the joint velocity after collision.

Calculate the moles of potassium sulfide formed when 5.4 g of potassium gas reacts with excess sulfur.

2 K+S > K2S

Calculate the mass of water formed when 5.0 moles of oxygen reacts with excess hydrogen gas.

2H2 + O2 > 2 H2O

How many grams is 3.01E24 molecules of N2O4 gas at STP?

How many grams is 5.97E24 molecules of C6H12O6 gas at STP?

if a normal sea level recipe is used to prepare a cake 1,000 meters below the surface of the earth, the cake will be much flatter than expected. explain and offer a solution

Using the data given below, calculate the value of ∆G for the following reaction at 298K: SO2(g)+Cl2(g) → SO2Cl2(l) ∆H =−97.3 kJmol⁻¹ and ∆S =−254.4 JK⁻¹mol⁻¹

Write an ionic equation for the reaction that takes place when an ammonium salt is heated with sodium hydroxide.