2.0-L cylinder of CH₄ (g) contains the same number of gas molecules at STP as a 2.0-liter rigid cylinder containing H₂(g) at STP.
It is a hypothetical approximation of the behavior of many gases under many condition, and expressed as PV = nRT.
As in the question it is given that rigid cylinder have the same temperature and pressure i.e. have a standard temperature and pressure. According to the Avogadro's Law, under the same temperature and pressure if equal amount of gas is taken then no. of moles of gases are same.
Ideal gas equation PV = nRT justifies the above statement.
So, from the given 2.0-L cylinder of CH₄ (g) contains the same number of gas molecules at STP.
Hence, option (2) is correct i.e. 2.0-L cylinder of CH₄ (g) contains the same number of gas molecules.
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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
Answer:
True
Explanation:
Resource Conservation and Recovery Act (RCRA). 1976 of United States Environmental Protection Agency(EPA) empowers EPA to control the production, transportation, storage, treatment and disposal of hazardous waste. The RCRA act was amended in 1984 and 1986 to include Waste minimization along with appropriate disposal (not in the landfill site) and tackling of petroleum hazardous waste respectively along with other waste.
Answer:
true is the correct answer.
Explanation:
Answer: To find Dave's speed, you can use the formula for speed, which is:
Speed = Distance / Time
In this case, Dave ran 2000 meters in 25 minutes. First, you'll need to convert the time to hours, as speed is typically measured in meters per second or meters per hour. There are 60 minutes in an hour, so:
25 minutes = 25 / 60 = 5/12 hours
Now, you can calculate Dave's speed:
Speed = 2000 meters / (5/12) hours
To divide by a fraction, you can multiply by its reciprocal (flip it):
Speed = 2000 meters / (5/12 hours) = 2000 meters * (12/5) hours
Now, calculate the speed:
Speed = 4800 meters per hour
So, Dave's speed is 4800 meters per hour.
Explanation: hope this helps :D
4.00 cm x 4.00 cm, calculate the third dimension of the block.
Answer:
y = 2.77 cm
Answer: The third dimension is 2.77 cm
The question deals with density in physics, specifically regarding the densest metal, osmium. The dimensions of an osmium block are partially given, and the task is to find the third dimension. However, without the mass of the block, it is impossible to give a complete solution.
The subject of the question involves understanding the concept of density, which is the mass of an object divided by its volume. The density of osmium is given as 22.57 g/cm³. The student is also given the dimensions of the osmium block, which forms a rectangular prism with known length and width (4.00 cm x 4.00 cm), but unknown height. D = m/v or v = m/D can be used to find the third dimension of the block (height).
However, to use this formula to get a complete solution, the mass of the block must be known, which is not provided in the question. Without this crucial information, we can't solve this problem correctly.
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What is the color of methyl orange after it is added to this sample?