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Bingel [31]
2 years ago
14

Select the correct answer.

Chemistry
1 answer:
Nata [24]2 years ago
3 0
C. Ninhydrin is used to detect prints on a non-porous surface
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Some students performed a titration between 20.0 mL of 0.5 M hydrochloric acid and 1.0 M potassium hydroxide solution. The stude
RideAnS [48]

Answer:

OPTION C) All hydrogen ions and all hydroxide ions have reacted to produce water, and so neither ion remains free in solution.

Explanation:

The PH reading on the left axis of the graph shows a value of 7.

A value of 7 on the PH scale implies that equal number of hydrogen ions completely reacted with hydroxyl ions to produce water i.e there is no excess of hydrogen and hydroxyl ion remaining in solution.

For values greater than 7, a basic solution is formed and it signifies the presence of excess hydroxyl ion. If the value is less than 7, there is more hydrogen ions in the solution formed and it is said to be acidic.

At point 7, the hydrogen and hydroxyl ions are equal and completely neutralize out one another.

Note: The acid solution would require a base volume of 20mL to be completely neutralized according to the plot. If it is less, the PH shifts to the left and the solution becomes acidic. If it more, the solution becomes basic and the PH shifts rightwards.

7 0
2 years ago
Read 2 more answers
ASAP HELP WILL MARK BRAINLIEST FOR BEST ANSWER. MUST ANSWER WITHIN 6 MIN!!!
Vesnalui [34]

Answer:

3 molecules

Explanation: i got it right on the test, also because the 2 other ones are compounds because they have hyrdogen and oxygen attached and molecules just have particles of one element attached

7 0
2 years ago
Read 2 more answers
How many unpaired electrons are present in a lithium atom?.
Cerrena [4.2K]
  • Lithium has Z =3

Electronic configuration is given by

\\ \tt\bull\rightarrowtail 1s^22s^1

  • 1s orbital is filled
  • 2s orbital is unfilled

So

  • unpaired electrons=1
5 0
2 years ago
What is the mass, in grams, of 28.74 mL of acetone?
a_sh-v [17]
The question is asking to calculate the mass in grams of the acetone that has a volume of 28.74 ml. Base on that, the possible answer would be 22.58 grams. I hope you are satisfied with my answer and feel free to ask for more if you have questions and further clarifications  
5 0
3 years ago
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Using the chemical equation in the picture, if you have 1.5 grams of Fe, how many moles of Fe would you have? (Round answer to 2
gavmur [86]

0.019moles

Explanation:

Given parameters:

Mass of Fe₂O₃ = 1.5g

Unknown:

Number of moles of Fe produced = ?

Solution:

To solve this problem, we must work from the known to the unknown. The known specie here is the mass of Fe₂O₃.

First inspect the equation and balance it;

     2Fe₂O₃  +    3C    →    4Fe   +    3CO₂

Now find the number of moles of Fe₂O₃

Number of moles of Fe₂O₃ = \frac{mass}{molar mass}

 molar mass of Fe₂O₃ = 2(56) + 3(16) = 112 + 48  = 160g/mol

 Number of moles = \frac{1.5}{160} = 0.009375moles

 From the equation, we see that;

   2 moles of Fe₂O₃ produced 4 moles of Fe

   0.009375 moles of Fe₂O₃ will produce \frac{0.009375 x 4}{2} = 0.01875‬moles of Fe

To 2 decimal places;

     0.019moles

learn more:

Number of moles brainly.com/question/1841136

#learnwithBrainly

7 0
2 years ago
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