A saline solution with a mass of 400 g has 30 g of NaCl dissolved in it. What is the mass/mass percent concentration of the solution?

Answers

Answer 1

Answer: (g solute/g solution)*100 = % mass/mass

30 g / 400 * 100

0,075 * 100

= 7,5% w/w

hope this helps!

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Which is a substance that is made up of only one type of atom?

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an element such as hydrogen

An element is made up of one type of atom only and cannot be split further.

What is 0.001012, 123, & 1.52 in scientific notation

Answers

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In an investigation that uses the scientific method, which step immediately follows making a hypothesis?

Answers

After you make a hypothesis, you then will test the hypothesis. You will test the hypothesis by testing the data that was collected and any additional data that proves that your hypothesis is correct. If your data shows that your hypothesis was not correct, you will then have to collect more data or come up with another hypothesis.

A well-tested explanation that explains a lot of observations isA. a hypothesis.
B. an inference.
C. a theory.
D. a controlled experiment.

Answers

A: Because a hypothesis is a educated guess

A well-tested explanation that explains a lot of observations is a theory.

When might a large volume of material have little mass

Answers

A large volume of material will have a small amount of mass when thematerial in question is gaseous or porous, and therefore has a lot ofspace within it despite taking up a large amount of space overall.

At what temperature is a gas likely to have the lowest rate of diffusion?10
150
b
210
с
249
d
300

Answers

Answer:

150

Explanation:

A gas will have the lowest rate of diffusion the lowest temperature from a given set of temperature values.

Since 150 is the lowest value, then this represents the lowest rate of diffusion.

The rate of diffusion is related to the prevalent temperature. When gases diffuse, they move from regions of high concentration to the at of low concentration. They must have enough kinetic energy to move in order to diffuse.

The higher the temperature, the more the kinetic energy and higher rate of diffusion.

Answer:

15º

Explanation:

The rate of diffusion is lower when the temperature is lower. Since 15º is the lowest temperature of the answers, it has the lowest rate of diffusion.

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