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lyudmila [28]
3 years ago
7

Why do scientists use stirbars in the laboratory?

Chemistry
2 answers:
stiks02 [169]3 years ago
0 0
D. to agitate a solution

kondor19780726 [428]3 years ago
0 0

Answer : The correct option is, (d) to agitate a solution

Explanation :

Stir bars is a type tool which is used in the chemical laboratory for mixing the solute in the solvent.

Stir bars is a magnet which is covered with such type of material that does not react with any liquid it is immersed in. Its cover is not react for any type of liquids.

The stir bar magnet is placed in a container or flask. The stir bar magnet made to spin with an external magnetic field.

The stir bar magnet is used in the laboratory to agitate a solution.

Hence, the correct option is, (d) to agitate a solution

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Which of the following objects would require the use of a large-scale model A. An atom B. A car engine C. A frog's heart D. The
levacccp [35]

Answer:

A. An atom

Explanation:

A large scale model is one that is bigger than the object itself. These are needed to visualise structures and behaviours that we cannot normally see. A large scale model is needed for small objects, such as an atom. Larger objects do not need<em> even bigger</em> models

4 0
3 years ago
Allison needs 18 liters of a 5% saline solution. She has a 1% solution and a 10% solution available. How many liters of the 1% s
kolezko [41]

Answer:

10 liters of the 1% solution and 8 liters of the 10% solution she should mix to make the 5% solution.

Explanation:

Let the volume of 1% acid solution used to make the mixture = x L

So, the volume of 10% acid solution used to make the mixture = y L

Total volume of the mixture = <u>x + y  = 18 L  .................. (1)</u>

For 1% acid solution:

C₁ = 1% , V₁ = x L

For 10% acid solution :

C₂ = 10% , V₂ = y L

For the resultant solution of sulfuric acid:

C₃ = 5% , V₃ = 18 L

Using

C₁V₁ + C₂V₂ = C₃V₃

1×x + 10×y = 5×18

So,

<u>x + 10y = 90  .................. (2)</u>

Solving 1 and 2 we get,

<u>x = 10 L</u>

<u>y = 8 L</u>

Thus,

<u>10 liters of the 1% solution and 8 liters of the 10% solution she should mix to make the 5% solution.</u>

7 0
3 years ago
I have a rock with the mass of 4.8 and a volume of 2.3.
WARRIOR [948]
Depending on what you need to round it to, it’s
1.9565
Or
1.957
Or
1.96

Density is mass/volume so it’s simply 4.8/2.3
Which equals
1.95652174

Hope this helped, good luck!
3 0
3 years ago
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NARA [144]
The Process Of Outgassing Help Layers of Earth To Form

6 0
3 years ago
Which 3 laws combine to make the Combined Gas Law?
lions [1.4K]

Answer:

Boyle's Law, Charles' Law, and Gay-Lussac's Law

Explanation:

3 0
3 years ago
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