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liraira [26]
3 years ago
11

Tell me what happens during Observing a chemical change

Chemistry
1 answer:
worty [1.4K]3 years ago
6 0

Explanation:

Gas bubbles can appear, there may be a color change, there may be a temperature change, there could be the production of light, volume change, change in smell or taste, or formation of a precipitate.

In a chemical change, atoms react with each other to form a new substance/product.

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lilavasa [31]

1.66 M is the concentration of the chemist's working solution.

<h3>What is molarity?</h3>

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.

In this case, we have a solution of Zn(NO₃)₂.

The chemist wants to prepare a dilute solution of this reactant.

The stock solution of the nitrate has a concentration of 4.93 M, and he wants to prepare 620 mL of a more dilute concentration of the same solution. He adds 210 mL of the stock and completes it with water until it reaches 620 mL.

We want to know the concentration of this diluted solution.

As we are working with the same solution, we can assume that the moles of the stock solution will be conserved in the diluted solution so:

n_1= n_2  (1)

and we also know that:

n = M x V_2

If we replace this expression in (1) we have:

M_1 x V_1= M_2 x V_2

Where 1, would be the stock solution and 2, the solution we want to prepare.

So, we already know the concentration and volume used of the stock solution and the desired volume of the diluted one, therefore, all we have to do is replace the given data in (2) and solve for the concentration which is M_2:

4.93 x 210 =  620 xM_2

M_2 = 1.66 M

This is the concentration of the solution prepared.

Learn more about molarity here:

brainly.com/question/19517011

#SPJ1

6 0
2 years ago
Using the process of photosynthesis, describe how carbon and oxygen cycles interact
Alex777 [14]
In photosynthesis, plants take in carbon dioxide and turn it into energy that comes out as oxygen.
8 0
3 years ago
Read 2 more answers
Sedimentary rocks are described as small pieces of rock and animal remains that are weathered, swept downstream and then settle,
tangare [24]

A. True

Sedimentary rocks are the only rocks that can hold fossils.

7 0
3 years ago
Read 2 more answers
How many moles of magnesium hydroxide, Mg(OH)2 can be created using 2.23 x 10^24 oxygen atoms?
igor_vitrenko [27]

Answer:

32.07 g/mole.

Explanation:

how this helps you young blood

7 0
3 years ago
1(a). What is the solubility of calcium chloride (CaCl2) at 5°C?
In-s [12.5K]

Answer:

60 g/100 g water  

Explanation:

Find 5 °C on the horizontal axis.

Draw a line vertically from that point until you reach the solubility curve for CaCl₂.  

Then draw a horizontal line from there to the vertical axis.

The solubility of CaCl₂ is 60 g/100 g water.

7 0
3 years ago
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