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kvv77 [185]
3 years ago
13

Which metal atom below cannot form a cation of several different charges?

Chemistry
1 answer:
Slav-nsk [51]3 years ago
4 0
Missing question: <span>Cr, Mn, Fe, Ba, Cu.
Answer is: Ba (barium).
Barium is metal from second group of periodic table of elements. Barium looses two electrons and has oxidation number +2.
Chromium has different oxidation numbers, usually +3 and +6, iron has oxidation numbers +2 and +3, copper +1 and +2 in their compounds.</span>
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What is a non example of tendon?
Maurinko [17]

Answer:

so the definition of it like the non example thing would be a flexible but elastic cord of strong flubber containing tissue and muscle to a bone the Hampshire of

4 0
3 years ago
How many molecules of ethanol (c2h5oh) (the alcohol in alcoholic beverages) are present in 140 ml of ethanol? the density of eth
Bond [772]
An mL is also equivalent to cm³, signifying that 140 mL is equivalent to 140 cm³. The mass of ethanol is calculated by multiplying the density by the volume.

              mass = (140 cm³)(0.789 g/cm³)
                   mass = 110.46 g

Then, calculate the number of moles of ethanol by dividing the mass by the molar mass of ethanol equal to 46.07 g/mol.
               number of moles = (110.46 g/ 46.07 g/mol) = 2.4 mol

Then, multiply the number of moles by the Avogadro's number.
                    2.4 mol (6.022 x 10²³)
           <em>      number of molecules = 1.445 x 10²⁴</em>
4 0
3 years ago
What is the [h3o+] for a solution at 25°c that has poh = 5.640?
jonny [76]

Answer:

= 4.37*10^-9 M

Explanation:

We know that;

pH + pOH = 14

Therefore;

pH = 14 - pOH

Which means; pH = 14 - 5.64

                               = 8.36

But;

pH = -log[H3O+]

Thus;

8.36 = -log[H3O+]

[H3O+] =  10^(-8.36)

        = 4.37*10^-9 M

5 0
3 years ago
HELPPP!! Which of the following describes light? (Select all that apply.)
Mnenie [13.5K]

Answer: A.Light travels in a straight line., B.Light behaves in a predictable way. , D.Light curves around corners or obstructions

-Hope this helps<3

5 0
2 years ago
Read 2 more answers
When people conserve electricity, power plants do not need to produce as much electricity because there is less demand for it.
almond37 [142]

True

Explanation:

When people conserve electricity, power plants do not need to produce as much electricity because there is less demand for it.

This very correct.

  • When electricity is used in a sustainable way, there is little of it consumed.
  • Switching off idle electronics would make that amount of electric current to be re-distributed to another place.
  • Less coal and fuel would be used and power plants do not need to produce as much electricity.
  • Most electricity produced in power plants are often wasted due to idle appliances consuming the bulk of them.
  • When these appliances are turned off, less energy is in demand and less will be produced.

learn more:

Conservation of resources brainly.com/question/8690489

#learnwithBrainly

5 0
3 years ago
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