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3 years ago

Mixtures can be separated by physical changes. Please select the best answer from the choices provided

Chemistry

2 answers:

eduard3 years ago

8 0

Answer:

answer is true

Explanation:

took test

Mazyrski [523]3 years ago

4 0

Where are the choices? :/

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A chemist adds of a sodium thiosulfate solution to a reaction flask. Calculate the mass in grams of sodium thiosulfate the chemi

schepotkina [342]

This is a incomplete question.The complete question is:

A chemist adds 180.0 ml of a 1.77 mol/L of sodium thiosulfate solution to a reaction flask. Calculate the mass in grams of sodium thiosulfate the chemist has added to the flask. Be sure your answer has the correct number of significant digits.

Answer: 50.4 g

Explanation:

To calculate the number of moles for given molarity, we use the equation:

$\text{Moles of solute}={\text{Molarity of the solution}}\times{\text{Volume of solution (in L)}}$ .....(1)

Molarity of sodium thiosulfate solution = 1.77 M

Volume of sodium thiosulfate solution = 180.0 mL = 0.1800 L

Putting values in equation 1, we get:

$\text{Moles of sodium thiosulfate}={1.77}\times{0.1800}=0.319moles$

Mass of sodium thiosulfate = $moles\times {\text {Molar mass}}=0.319moles\times 158.11g/mol=50.4g$

Thus 50.4 g of sodium thiosulfate the chemist has added to the flask.

6 0

3 years ago

Object is irregularly shaped solid and it is dropped into a graduated cylinder and it displays 25 mL of water and has a mass of

Blababa [14]

Answer:

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume}\\$

From the question

mass = 30 g

volume= 25 mL

We have

$density = \frac{30}{25} \\ = 1.2$

We have the final answer as

Hope this helps you

7 0

3 years ago

The ____ cycle is not a nutrient cycle.

katrin [286]

Answer:

Nitrogen Cycle I think

Explanation:

5 0

3 years ago

Read 2 more answers

The mass spectrum of an organic compound shows the relative abundances of M to be 34.76% and M 1 to be 2.632%. Assuming the peak

alukav5142 [94]

The number of carbon atoms present in any compound is equal to seven.

<h3>How do we calculate the number of carbon atoms?</h3>

Number of carbon atoms present in any compound will be calculated by using the following equation:

No. of Carbon atoms = Relative intensity of M+1 peak / Natural abundance of C13

Intensity of molecular peak = 34.76%

Intensity of M+1 peak = 2.632%

Relative intensity of M+1 peak = (100/34.76)×2.632 = 7.57%

Given that natural abundance of M+1 = 1.07%

On putting values on above equation, we get

No. of C atoms = 7.57 / 1.07 = 7.07 = 7 (approx)

Hence number of carbon atoms is 7.

To know more about mass spectrum, visit the below link:

brainly.com/question/17368088

#SPJ1

7 0

3 years ago

What happens to the volume of a liquid when it is poured from a small container into a large container?

nadezda [96]

Answer:

it stays the same i think

Explanation:

5 0

3 years ago