Calculate the mole fraction of HOCl at pH 6.0
2. Hypochlorous acid (HClO) is 80-200 times better disinfectant than OCl-. What percentage of the HClO/OCl- system is present as HClO at pH = 6 and at pH = 8? pKa = 7.6. At what pH would you recommend its use as a disinfectant? explain
3. A river water has the following characteristics:
TOC = 2 mg/L, Fe 2+= 0.5 mg/L, Mn2+=0.2 mg/L,
HS-= 0.1 mg/L, NH4+= 0.3 mg/L
What is the demand for chlorine?
4.Monochloramine is a desired species for the disinfection of wastewater effluents in a treatment plant. The total concentration of ammonia in the treated effluent is 1 mg/L as NH3-N.
Determine the concentration of HOCl required based on the stoichiometric weight ratio of Cl2:NH3-N for the formation of monochloramines. Assume that the pH is relatively stable in the effluent.

Answer:bro need more classification

Step-by-step explanation:

Answer:

d =(m-q)/a

Step-by-step explanation:

\(q+ad=m\\ad = m-q\\\frac{ad}{a} = \frac{m-q}{a} \\\\d = \frac{m-q}{a}\)

Answer:

d =  ( m-q)/a

Step-by-step explanation:

q+ad=m

Subtract q from each side

q-q+ad=m-q

ad = m-q

Divide each side by a

ad/a = ( m-q)/a

d =  ( m-q)/a

The expression of the given volume formula for the l will be 1 and l, in general, will be V/(wh).

A mixture of variables, numbers, addition, subtraction, multiplication, and division are called expressions.

An expression is a mathematical proof of the equality of two mathematical expressions.

A statement expressing the equality of two mathematical expressions is known as an equation.

As per the given volume expression,

V= lwh

a)

l = V/(wh)

l = 8/(2 × 4) = 1

b)

V= lwh

l = V/(wh)

Hence "The expression of the given volume formula for the l will be 1 and l, in general, will be V/(wh)".

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To find the speed at which the Salisbury family was driving, we can use the formula: Speed = Distance / Time. So, the Salisbury family was driving at a speed of 89 kilometers per hour.

The distance they traveled is the difference between their initial distance from home (750 km) and their distance from home after 4 hours (394 km):
Distance = 750 km - 394 km = 356 km
The time they took to cover this distance is 4 hours.

Now we can calculate the speed:
Speed = 356 km / 4 h = 89 km/h
Therefore, the Salisbury family was driving at a speed of 89 kilometers per hour.

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Answer: Choice B

A pool is filled with water using one valve. A little time after the pool is filled to its capacity, the pool needs to be emptied because of some problems. Then the pool is refilled immediately, using two valves this time.

========================================================

Explanation:

The parts where the graph goes uphill, as you move from left to right, is when the pool is being filled up. The slope tells us how fast the water is being added. The steeper the slope, the faster the rate.

Compare the first time the pool is filled up to the second time we fill it up. The second upward slope is steeper, indicating a faster rate. So this means either we brought a bigger hose, we increased the water flow rate, or we used two valves.

The downhill portion is when the pool is being emptied.

The flat parts are when the pool's water level is not changing. This is likely when the pool is filled to capacity. Of course, there's a buffer between the water level and the deck level, to avoid water spilling onto the deck (since water is going to be splashed and sloshed around).

All of these facts lead to choice B being the answer.

----------------------------

Extra info:

So we could effectively eliminate choices A, C and D to be left with B as our final answer.

Answer:

B, E

Step-by-step explanation:

3 meters is 300 centimeters so that eliminates A and D since they are lower and we know E is higher than 300

Now to find if B and C are higher since they both are 2 meters is we make 3 meters look like this it will be

2 meter 100 centimeters and b is the only one greater

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Step-by-step explanation:

Answer: 20% of 75 is 15.

,....

We can be 95% confident that the true population mean BMI is between 25.368 and 29.032.

A 95% confidence interval for the population mean can be constructed using the t-distribution when the sample size is small (<30) or the population standard deviation is unknown.

In this case, we have a random sample of 46 people with a mean body mass index (BMI) of 27.2 and a standard deviation of 6.0.

Thus, we need to use the t-distribution to construct the confidence interval.

The formula for the confidence interval is as follows:

Upper limit of the confidence interval:27.2 + (2.013) (6.0/√46) = 29.032Lower limit of the confidence interval:27.2 - (2.013) (6.0/√46) = 25.368

Therefore, the 95% confidence interval for the population mean BMI is (25.368, 29.032).

This means that we can be 95% confident that the true population mean BMI is between 25.368 and 29.032.

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Answer:

14.6mm

Step-by-step explanation:

The formula for finding the circumference of a circle is 2πr.

The circumference is 91.688 millimeters inorder to find the radius we have to do the opposite or inverse of multiplication which is division.

So we divide the circumference by 2 and pi which is 3.14 which will give us the radius

r = radius = 91.668 ÷ 3.14 ÷ 2 = 14.6

Answer: its c

Step-by-step explanation:

Answer:

35 seconds

Step-by-step explanation:

At negative values he is inside the volcano,  when he reaches 0 he will be at the top of the volcano

At 35 seconds, the elevation is 0, so he is at the top of the volcano

Answer:

seventy and six hundred eighty-one thousandths

Answer:

seventy thousand six hundred eighty one.

Step-by-step explanation: that is your answer

Answer:

(a) The common difference is 4

(b) The 25th term is 108

Step-by-step explanation:

Given

\(T_7 = 36\)

\(T_{14} = 64\)

Solving (a): The common difference

The nth term of an AP is:

\(T_n = a + (n -1)d\)

For the 7th term, we have:

\(36 = a + (7 -1)d\)

\(36 = a + 6d\)

For the 14th term, we have:

\(64 =a + (14 -1)d\)

\(64 =a + 13d\)

Subtract both equations

\(64 - 36 = a - a +13d-6d\)

\(28 = 7d\)

Divide by 7

\(d = 4\)

Solving (b): The 25th term

First, we calculate the first term (a)

The 7th term of the progression is:

\(36 = a + 6d\)

Substitute \(d = 4\)

\(36 = a + 6 * 4\)

\(36 = a + 24\)

Subtract 24

\(a = 36 -24\)

\(a = 12\)

The 25th term is:

\(T_{25} = a + (25 - 1)d\)

\(T_{25} = 12 + (25 - 1)*4\)

\(T_{25} = 12 + 24*4\)

\(T_{25} = 108\)

The solution to a given word problem by writing it as an equation is k = 253/232

The process of expressing word problems in mathematical forms takes a logical and chronological approach while taking the variables and arithmetic operations given into consideration.

From the given information, to express the word problem in mathematical form, we have:

Making k the subject of the equation, we have:

k = 253/232

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Answer:

The answer to your problem is, 6a

How to find the GCF:

6a(x²+x+1)

Use that problem

The answer to your problem is, 6a

The p-value for this sample is the probability of observing at least 35 successful observations given that the null hypothesis is true. In this problem, the null hypothesis is that the probability of success (p) is equal to 0.2 and the alternative hypothesis is that the probability of success is greater than 0.2.

Therefore, this is a right-tailed test with a significance level of 0.01.The probability of observing at least 35 successful observations in a sample of size 123, assuming the null hypothesis is true, can be found by using the cumulative binomial distribution as follows:

\(P(X ≥ 35) = 1 - P(X ≤ 34)\)

where the summation is from k = 0 to 34. Using a binomial calculator, we get:

\(P(X ≤ 34) = 0.0007048589576853466\) Therefore,\(P(X ≥ 35) = 1 - P(X ≤ 34) = 1 - 0.0007048589576853466 = 0.9992951410423147\) The p-value is the probability of observing at least 35 successful observations given that the null hypothesis is true. Therefore, the p-value for this sample is 0.9992951410423147.

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The spring will stretch 1.5 times further when the 0.60 kg block is added to the 1.2 kg block.

To determine how much further the spring will stretch when a 0.60 kg block is added to the 1.2 kg block, we need to consider Hooke's Law, which states that the force exerted by a spring is directly proportional to the displacement from its equilibrium position.

Let's assume that the spring is initially stretched by a certain amount x when only the 1.2 kg block is attached. The force exerted by the spring is given by F = kx, where k is the spring constant.

When the 0.60 kg block is added, the total mass becomes 1.2 kg + 0.60 kg = 1.8 kg. The force exerted by the spring remains the same, but the total mass affects the acceleration of the system according to Newton's second law, F = ma.

Using F = ma, we can find the acceleration of the system: F = (1.8 kg)(9.8 m/s^2) = 17.64 N.

Since F = kx, we can rearrange the equation to find x: x = F/k.

Now, if we assume the spring constant k remains constant, the displacement x will increase by a factor of 1.8 kg/1.2 kg = 1.5.

Therefore, the spring will stretch 1.5 times further when the 0.60 kg block is added to the 1.2 kg block.

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Answer:

predict the impact of removing snakes from this food web

Answer:

NO

Step-by-step explanation:

it is not bigger because the number is the same but the third digit is not the same and the five is greater than 0

Natural selection can cause microevolution (change in allele frequencies), with fitness-increasing alleles becoming more common in the population.

Fitness is a measure of reproductive success (how many offspring an organism leaves in the next generation, relative to others in the group).

Natural selection can act on traits determined by alternative alleles of a single gene, or on polygenic traits (traits determined by many genes).

Natural selection on traits determined by multiple genes may take the form of stabilizing selection, directional selection, or disruptive selection.

All of these mechanisms can make a population evolve, or change its genetic makeup over generations.

But there's one mechanism of evolution that's a bit more famous than the others, and that's natural selection. What makes natural selection so special? Out of all the mechanisms of evolution, it's the only one that can consistently make populations adapted, or better-suited for their environment, over time.

You may have already seen natural selection as part of Darwin’s theory of evolution. In this article, we will dive deeper – in fact, deeper than Darwin himself could go. We will examine natural selection at the level of population genetics, in terms of allele, genotype, and phenotype frequencies.

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Answer:

D. 3

hope this helps

have a good day :)

Step-by-step explanation:

Answer:

Step-by-step explanation:

1. Substitute t and v

p=1000(32)/800

2. solve

p=32000/800

3.simplify

p=40

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Answer:

2.8

Step-by-step explanation:

This is because you can divide 2 by 3. Then multiply 4.2 by that number and that gets you your answer.

4.2 ÷ 3 = 1.4

1.4 times 2 = 2.8

Answer:

is tungtset i tink not sure bout

Step-by-step explanation:

mark me brainlest plz

Answer:

529

Step-by-step explanation:

892=x+363.

We want to get x by itself so we know what it equals.

Because 363 is adding to x we subtract it to the other side.

892-363=529

529=x

So the other number is 529

The other number is 529.

In mathematics, an equation is a formula that expresses the equality of two expressions, by connecting them with the equals sign =.

The sum of two numbers is 892.

Let the two unknown numbers be x and y.

Now, x+y=892

One of the numbers is 363.

x+363=892

x=892-363

x=529

Therefore, the other number is 529.

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Answer:

330 television set

Step-by-step explanation:

Last month production = 880 television sets

This month production = 1,210 television sets

The increase in production from last month to this month = This month production - Last month production

= 1,210 - 880

= 330

The increase in production from last month to this month = 330 television set

As per linear equation, the increase in production of television of the factory is 330.

A linear equation is an equation where the variable has the highest power of 1.

Given, a factory produced 880 television sets last month.

This month, the same factory produced 1,210 television sets.

Therefore, the increase in production of television of the factory is

\(= (1210-880)\\= 330\)

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