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andriy [413]
2 years ago
9

a student takes two strips from the epidermis of an onion and places one in distilled water and the other in concreted salt solu

tion. She then uses the camera to photograph a sample of these cells under a microscope. Suggest why a red onion is often used when carrying out this investigation
Chemistry
1 answer:
maks197457 [2]2 years ago
5 0

see bahubali picture and pushpa this is your answer Visit your school library, read newspapers and discuss with your elders in your family to get information related to various activities, campaigns and news items about animal welfare. You can also do web search using keywords like endangered animals, animal rights, animal welfare, etc. Write a note of about 300-400 words describing the facts on the animal. Draw/paste picture as suitable. Note the following points: 1. animal in concern 2. year of origin of the project/activities/campaign, etc. 3. information regarding the animal 4. human-animal relationship

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Silicon has a relatively large latent heat of vaporization of 12800 J/g. This indicates that silicon has:
Lesechka [4]

strong attraction between liquid particles

7 0
3 years ago
Read 2 more answers
An 8.0 L sample of neon gas at 300. K exerts a pressure of 900. kPa. If the gas is compressed to 2.0 L and the temperature is ra
svetoff [14.1K]

Answer:

7200 kPa

Explanation:

Applying,

PV/T = P'V'/T'................ Equation 1

Where P = Initial pressure of neon gas, V = Initial volume of neon gas, T = Initial temperature of neon gas, P' = Final pressure of neon gas, V' = Final volume of neon gas, T' = Final Temperature of neon gas

Make P' the subject of the equation

P' = PVT'/V'T.............. Equation 2

Given: P = 900 kPa, V = 8.0 L, T = 300 K, V' = 2.0 L, T' = 600 K

Substitute these values into equation 2

P' = (900×8×600)/(2×300)

P' = 7200 kPa

6 0
2 years ago
Can 1750 mL of water dissolve 4.6 moles of Copper Sulfate CuSO4? _________ Why? / Why not?
Wewaii [24]

Answer:

  • <u>No, you cannot dissolve 4.6 moles of copper sulfate, CuSO₄, in 1750mL of water.</u>

Explanation:

This question is part of a Post-Lab exercise sheet.

Such sheet include the saturation concentrations for several salts.

The saturation concentration of Copper Sulfate, CuSO₄, indicated in the table is 1.380M.

That means that 1.380 moles of copper sulfate is the maximum amount that can be dissolved in one liter of solution.

Find the molar concentration for 4.6 moles of copper sulfate in 1,750 mL of water.

You need to assume that the volume of water (1750mL) is the volume of the solution. This is, that the 4.6 moles of copper sulfate have a negligible volume.

<u>1. Volume in liters:</u>

  • V = 1,750 mL × 1 liter / 1,000 mL = 1.75 liter

<u />

<u>2. Molar concentration, molarity, M:</u>

  • M = number of moles of solute / volume of solution in liters

  • M = 4.6 moles / 1.75 liter = 2.6 M

Since the solution is saturated at 1.380M, you cannot reach the 2.6M concentration, meaning that you cannot dissolve 4.6 moles of copper sulfate, CuSO₄ in 1750mL of water.

8 0
3 years ago
5. Citric acid is the main acid present in lemon juice. However vitamin C, or ascorbic acid is
aev [14]

In the titration of lemon juice, the presence of ascorbic acid means the concentration of citric acid you calculated is higher.

An acid-base titration is a common way to determine the unknown concentration of an acid, given we know the concentration of the base and determine the spent volume in the titration. Let's consider the neutralization reactions that take place in a mixture of citric acid and ascorbic acid.

Citric acid titration :

3 NaOH(aq)  +  H₃C₆H₅O₇(aq)  →  Na₃C₆H₅O₇(aq)  +  3 H₂O(l)

Ascorbic acid titration:

NaOH(aq) + HC₆H₇O₆(aq)  →   NaC₆H₇O₆(aq)   +  H₂O(l)

If we titrated a solution that contained only citric acid, we can relate through stoichiometry the moles and concentration of citric acid. However, if the solution also contained ascorbic acid, we would have to spend more NaOH to titrate it. Since more NaOH would react, we would conclude that there is more citric acid to react, calculating a higher concentration of the same.

In the titration of lemon juice, the presence of ascorbic acid means the concentration of citric acid you calculated is higher.

You can learn more about titration here: brainly.com/question/2728613

7 0
1 year ago
Acetylene reacts with hydrogen in the presence of a catalyst to form ethane according to the following reaction:
ElenaW [278]

Answer:

mole fraction of acetylene in the original mixture = 0.29

Explanation:

The application of Dalton's law of partial pressure comes into play.

From Partial pressure = Mole fraction x total pressure.

The step by step calculation is as shown in the attachment.

3 0
3 years ago
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