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3 years ago

Why should distilled water be tested for conductivity?

1 answer:

5 0

Salinity and conductivity measure the water's ability to conduct electricity, which provides a measure of what is dissolved in water. In the SWMP data, a higher conductivity value indicates that there are more chemicals dissolved in the water. ... Ions increase the water's ability to conduct electricity.

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How can you simulate the radioactive half-life of an element?

ch4aika [34]

Answer:

TRIAL 1:

For “Event 0”, put 100 pennies in a large plastic or cardboard container.

For “Event 1”, shake the container 10 times. This represents a radioactive decay event.

Open the lid. Remove all the pennies that have turned up tails. Record the number removed.

Record the number of radioactive pennies remaining.

For “Event 2”, replace the lid and repeat steps 2 to 4.

Repeat for Events 3, 4, 5 … until no pennies remain in the container.

TRIAL 2:

Repeat Trial 1, starting anew with 100 pennies.

Calculate for each event the average number of radioactive pennies that remain after shaking.

Plot the average number of radioactive pennies after shaking vs. the Event Number. Start with Event 0, when all the pennies are radioactive. Estimate the half-life — the number of events required for half of the pennies to decay.

Explanation:

6 0

3 years ago

What is the one standard atmosphere of pressure in kilospascals?

satela [25.4K]

knowing that:
760 mmHg = 1 atm = 101.3 KPa = 760 torr

Answer:
C. 101.3 kPa

3 0

3 years ago

Read 2 more answers

Why would satellite imagery be more useful than a map in some instances? provides landmarks, such as buildings can be used when

miss Akunina [59]

Answer:c

Explanation:

7 0

3 years ago

How many oxygen atoms are in 7.25g of calcium nitrate

Yuki888 [10]

Answer:

The answer to this question is approximately equal to 1.6 ×

$1.6 \times {10}^{23} atom \: o$

7 0

3 years ago

I attached the problem below.

Phantasy [73]

Answer:

Step 1: CCl4 + 2(HF) --> CCl2F2 + 2(HCl)

Step 2: CCl2F2: 121 g/mol CCl4: 154 g/mol

Step 3: 25.1 g

Step 4: 50.6%

Explanation:

Step 1: Write a balanced equation

The unbalanced form of the equation is just what the problem tells you in the beginning: Freon is synthesized from CCl4 with HF. HCl is also made as a byproduct. This means that our equation will be:

CCl4 + HF --> CCl2F2 + HCl

This equation is clearly unbalanced, as there are different numbers of atoms on either side.

Starting Atoms:

(The arrow shows what is on either side of the reaction arrow)

C: 1 --> 1

Cl: 4 --> 3

H: 1 --> 1

F: 1 --> 2

Let's first try adding a coefficient of 2 to HCl.

Coefficient One:

C: 1 --> 1

Cl: 4 --> 4

H: 1 --> 2

F: 1 --> 2

However, now the H (as well as the F) are out of balance on the left side of the arrow. Luckily, putting a coefficient of 2 in front of HF balances the equation completely.

Coefficient Two:

C: 1 --> 1

Cl: 4 --> 4

H: 2 --> 2

F: 2 --> 2

This means that the balanced equation is:

CCl4 + 2(HF) --> CCl2F2 + 2(HCl)

Step 2: Calculate the Molar Masses

To find the molar masses, we simply add up all of the individual atomic masses.

CCl2F2: (12.0)+2(35.5)+2(19.0) = 121 g/mol

CCl4: (12.0)+4(35.5) = 154 g/mol

Step 3: Calculate the Theoretical Yield in Grams

We can now put together the previous steps. You typically need to figure out which molecule is the limiting reactant, but as they have only given you one initial mass, we can assume that CCl4 will be the LR. Essentially, the next step is to do several conversions to turn this reactant gram value into a product value. We will go from g of reactant to moles of reactant (using its molar mass), then to moles of product (with the balanced equation), and finally, to grams of product (using the other molar mass):

$\frac{31.9g}{1} *\frac{1molCCl4}{154g} *\frac{1molproduct}{1molCCl4} *\frac{121g}{1molproduct}=25.1g$

This results in 25.1 g of product as our theoretical yield. This amount is the absolute maximum amount of product that could possibly be made from the amount of starting materials that we put in.

Step 4: Calculate the Percent Yield

This is probably the easiest step. All we have to do is use the following equation, and we will have our answer:

$(\frac{created}{expected})*100=yield$

The created value is what is given in the problem itself: 12.7 g

The expected amount is our theoretical yield value that we just calculated: 25.1 g

Substituting this into the equation, our percent yield is just over half at about 50.6%. Keep in mind that a yield of 100% is just about impossible due to human error, things being left on glassware, etc.

4 0

3 years ago