what is the molar mass U
B) 8
C) 10
D) 12
26) Which pH indicates a basic solution?
A) 1
B) 5
C) 7
D) 12
27)
Given the following solutions:
Solution A: pH of 10
Solution B: pH of 7
Solution C: pH of 5
Which list has the solutions placed in order of increasing H+ concentration?
A)
A, B, C
B)
B, A, C
C)
C, A, B
D)
C, B, A
28) Which of the following pH values indicates the highest concentration of hydronium ions in a solution?
A) pH = 1
B) pH = 2
C) pH = 3
D) pH = 4
29) As HCl(g) is added to water, the pH of the water solution
A) decreases
B) increases
C) remains the same
30) What is the pH of a 0.0001 M aqueous solution of HCl?
A) 1
B) 2
C) 3
D) 4
31) What is the pH of a 0.001 M HNO3 solution?
A) 1
B) 2
C) 3
D) 11
32) The [H3O+] of a solution is 1 × 10–8. This solution has a pH of
A) 6, which is acidic
B) 8, which is basic
C) 6, which is basic
D) 8, which is acidic
33) The H3O+ ion concentration of a solution is 1 × 10–4 mole per liter. This solution is
A) acidic and has a pH of 4
B) acidic and has a pH of 10
C) basic and has a pH of 4
D) basic and has a pH of 10
34) The pH of 0.001M HCl is
A) 1
B) 2
C) 3
D) 4
35)
Phenolphthalein is pink in an aqueous solution having a pH of
A)
5
B)
2
C)
7
D)
12
36)
What is the color of the indicator thymol blue in a solution that has a pH of 11?
A)
red
B)
blue
C)
pink
D)
yellow
37) Three samples of the same solution are tested, each with a different indicator. All three indicators, bromthymol blue, bromcresol green and thymol blue, appear blue if the pH of the solution is
A) 4.7
B) 6.0
C) 7.8
D) 9.9
38) Based on the results of testing colorless solutions with indicators, which solution is most acidic?
A) a solution in which bromthymol blue is blue
B) a solution in which bromcresol green is blue
C) a solution in which phenolphthalein is pink
D) a solution in which methyl orange is red
39)
Which indicator would best distinguish between a solution with a pH of 3.5 and a solution with a pH of 5.5
A)
bromthymol blue
B)
bromcresol green
C)
litmus
D)
thymol blue
40) Which indicator is blue in a solution that has a pH of 5.6?
A) bromcresol green
B) bromthymol blue
C) methyl orange
D) thymol blue
41) Which indicator, when added to a solution, changes color from yellow to blue as the pH of the solution is changed from 5.5 to 8.0?
A) bromcresol green
B) bromthymol blue
C) litmus
D) methyl orange
42)
The table below shows the color of the indicators methyl orange and litmus in two samples of the same solution.
Which pH value is consistent with the indicator results?
A)
1
B)
5
C)
3
D)
10
43) In which 0.01 M solution is phenolphthalein pink?
A) CH3OH(aq)
B) Ca(OH)2(aq)
C) CH3COOH(aq)
D) HNO3(aq)
44) Which indicator is yellow in a solution with a pH of 9.8?
A) methyl orange
B) bromthymol blue
C) bromcresol green
D) thymol blue
45) In which solution will thymol blue indicator appear blue?
A) 0.1 M CH3COOH
B) 0.1 M KOH
C) 0.1 M HCl
D) 0.1 M H2SO4
46) According to Reference Table M, what is the color of the indicator methyl orange in a solution that has a pH of 2?
A) blue
B) yellow
C) orange
D) red
47) Which solution when mixed with a drop of bromthymol blue will cause the indicator to change from blue to yellow?
A) 0.1 M HCl
B) 0.1 M NH3
C) 0.1 M CH3OH
D) 0.1 M NaOH
48)
According to one acid-base theory, NH3 acts as a base when an NH3 molecule
A)
accepts an ion
B)
donates an ion
C)
accepts an ion
D)
donates an ion
49)
Given the diagram representing a reaction:
According to one acid-base theory, the water acts as
A)
a base because it accepts an H+
B)
a base because it donates an H+
C)
an acid because it accepts an H+
D)
an acid because it donates an H+
50)
Given the balanced equation representing a reaction:
According to one acid-base theory, the H2O() molecules act as
A)
a base because they accept H+ ions
B)
a base because they donate H+ ions
C)
an acid because they accept H+ ions
D)
an acid because they donate H+ ions
B. francium and platinum
C. rubidium and zinc
D. barium and mercury
You and your team work at Southern Nevada Water Authority and have been given the job of managing fluoride levels for the municipal water system. Today, you will need to measure the mass of the mineral sample fluorite (chemically, CaF2). Use this sample to determine how much water must be added to yield a 1 ppm fluoride solution. Your supervisor is requesting tanker trucks to bring the excess water. He needs to know how many tanker trucks to request and the total cost.
Notes: 1 mol CaF2 = 78.08 g CaF2 = 6.02 x 1023 molecules of CaF2
1 molecules of CaF2 = 2 atoms of F
1 mol H2O = 18 g H2O Density of water is 1 g/mL
1000 mL = 1 L and 3.78 L = 1 gallon
mass of sample of CaF2 = 287.185 g
1 part per million = 1 atom of fluorine per 999,999 water molecules.
1 truck can carry 12,800 litters of water at a cost of $2,852.42 dollars.
Before you begin mixing a solution of fluorite and water your team must first calculate the amount of water you will need. Your team will create a presentation that will show all of the necessary calculations to ensure that the greater Las Vegas area will have cavity free teeth. The presentation should include the following information:
- Draw a diagram that points out the basic design of the water system and transport.
- Demonstrate the following calculations
(a) Calculate how many moles of mineral fluorite (CaF2) are in you sample.
(b) Calculate the number of fluorine atoms in the sample of the mineral fluorite (CaF2).
(b) Calculate how many molecules of water you will need.
(c) Calculate the number of gallons of water that are needed to dissolve a 287.185 gram sample of fluorite to yield 1ppm solution.
(e) How many trucks will be needed? Show your calculations!
(f) what is will be the total cost?
- Bonus points for creativity or “WOW” factor (i.e. pictures, color, neatness)!
I AGREE WITH bmstanley19
B. appetite.
C. culture.
D. activity level.