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Consider the neutralization reaction
2HNO3(aq)+Ba(OH)2(aq)⟶2H2O(l)+Ba(NO3)2(aq)
A 0.110 L sample of an unknown HNO3 solution required 51.1 mL of 0.150 M Ba(OH)2 of
0.150 M Ba(OH)2 for complete neutralization. What is the concentration of the
HNO3 solution?
A student has 8.85 g of zinc powder, 1.95 L of a 2.00 M
calcium nitrate solution, and 1.35 L of a 3.10 M lead(II) nitrate solution.
Write the chemical reaction that occurs between the two reacting species. Include physical states.
What volume of the solution is needed to completely react all 8.85 g of zinc powder?
Calculate the molarity of the Zn2+ ions in solution after the reaction.
Tin(IV) sulfide, SnS2, a yellow pigment, can be produced using the following reaction.
SnBr4(aq)+2Na2S(aq)⟶4NaBr(aq)+SnS2(s)
Suppose a student adds 49.0 mL of a 0.452 M solution of SnBr4 to 44.8 mL of a 0.153 M solution of Na2S.
Identify the limiting reactant.
Calculate the theoretical yield of SnS2
The student recovers 0.347 g SnS2. Calculate the percent yield of
SnS2 that the student obtained.
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Ammonia (NH3, MM 17.031 g/mol) and hypobromite (OBr−) react according to the following chemical reaction.
2NH3+3OBr−⟶N2+3Br−+3H2O
Suppose 0.809 g of ammonia reacts with 37.2 mL of a hypobromite solution. Calculate the concentration of the hypobromite solution.
a bottled water company has found in the past that 2% of their bottled wtaer doews not meet the companys high standards. as such periodic samples are taken and tested for their quality. if from the last batch a sample opf bottles of 12 bottles are taken and tested, determine the probability; carefully define the random variable of interest
The Bob of a simple pendulum oscillates with an amplitude of 20 cm. If the acceleration of the Bob is - 4y, where y is the displacement, calculate the
(I) magnitude of its maximum acceleration.
(II) period of the motion
(III) magnitude of the maximum velocity
1. A population consists of the four numbers (2,3,5). Consider all possible samples of size 2 that can be drawn with
replacement from this population. Find the following:
The mean of the population
b. The standard deviation of the population
The mean of the sampling distribution of means
d. The standard deviation of the sampling distribution of means.
Illustrate the probability histogram of the sampling distribution of the means
Complete the table below.
Testimony by chris mann
The word ‘but’ in line 7 indicates a shift in the poem. What change occurs here?
South Africa is in crisis and is experiencing a leadership crisis- Julius malema ,2014 .IOL
1. Explain the above statement from Julius Malema speech
2. Identify an influential figure in South African public sector and discuss whether they fulfill leadership requirements
2.1physical requirements
2.2 personality requirements
2.3 skills requirements
3 consult 5 academic sources
Testimony by chris mann
Based on the first stanza of the poem, how do you think the speaker feels about the
person he is addressing? Is this feeling different from how he felt in the past? Explain.
