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2 years ago

A medium that works by showing two reaction types, such as a color change in some colonies but not in others is called a(n)

Chemistry

1 answer:

ser-zykov [4K]2 years ago

3 0

A medium that works by showing two reaction types is called a differential medium

<h3>Differential media</h3>

Differentia media are one of the numerous culture media used in culturing microorganisms. They are also known as indicator media.

They are called differential media because they are able to make a distinction between two microorganisms growing on them based on the biochemical characteristics of some organisms in the presence of certain indicators or nutrients.

More on differential media can be found here: brainly.com/question/12944497

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3- a) write the formula unit of calcium fluoride.

zvonat [6]

Answer:

a) CaF₂.

b) 7.81g of CaF₂ are present.

Explanation:

a) The calcium ion has as charge Ca²⁺ and fluoride ion is F⁻, that means formula unit is:

CaF₂

b) 1 molecule of CaF₂ contains 2 anions, F⁻. Thus, the moles of CaF₂ is:

1.2x10²³ anions * (1 moleculeCaF₂ / 2 anions) = 6x10²² molecules of CaF₂

6.022x10²³ molecules = 1mol:

6x10²² molecules of CaF₂ * (1mol / 6.022x10²³molecules) = 0.10 moles CaF₂.

1 mole of CaF₂ has a mass of 78.07g:

0.10 moles CaF₂ * (78.07g / mol) =

7.81g of CaF₂ are present

5 0

3 years ago

According to the rock cycle, which of the following transitions are possible? Assume an unlimited number of steps.

egoroff_w [7]

Answer:

The answer is D

Explanation:

All of these solutions are correct.

7 0

3 years ago

Copper sulfate forms blue crystals. The solubility of blue copper sulfate is 32 g per 100g of water at 20 Celsius

Zanzabum

Answer:

nnnnnnnkkkmn

fhhjvvcGM NBCvvv

6 0

3 years ago

Perform the following

Zarrin [17]

This problem is providing a mathematical expression which the result should be expressed with the correct significant figures. At the end, the result is 1209.0 because of the following:

<h3>Significant figures:</h3>

In science, the use of significant figures is crucial as long numbers are not necessarily required when reporting a numerical value, for that reason the importance of reporting measurements with the correct number of significant figures.

In the case of additions, we perform the normal operation as the first step:

1204.2 +4.79613 = 1208.99613

Next, we round the result to the least number of decimal places, in this case one because 1204.2 has just one decimal place, unlike the 4.79613 which has five, so that we round the 8 up to 9 and leave a 0 as the only decimal place:

1209.0

Learn more about significant figures: brainly.com/question/11904364

6 0

2 years ago

To maximize the yield in a certain manufacturing process, a solution of a weak monoprotic acid that has a concentration between

stira [4]

Answer: C 115 ml

Explanation:

If you have a solution of a monoprotic acid, it means that it has the form HA (just one Hydrigen atom). Therefore, one molecule of acid is going to react with just one molecule of NaOH.

So, if you have a solution of 100 ml of 0,2 HA acid, it is going to react with a 100 ml of 0,2 M NaOH solution. Beacause we know that the acid can be a little more concentrated than 0,2 M (0,2-0,3), it probably needs a little more than 100 ml of NaOH to react. So, the answer is C.

in 100 ml of 0,2M acid you can find 0,002 mol of HA

in 100 ml of 0,3 M acid you can find 0,003 mol of HA

in 100 ml of 0,2 M NaOH you can find 0,002 mol of NaOH

the answer can not be 200 because in 200 ml of 0,2 M NaOH there are 0,004 mol of NaOH, which is more than 0,003 mol.

0 0

4 years ago