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Lunna [17]
3 years ago
6

what sentence describes all atoms of one element A. They have the same number of isotopes B. They have the same properties C. Th

ey have the same number of protons D.They have the same number of neutrons
Chemistry
1 answer:
Daniel [21]3 years ago
6 0

Answer:

C. They have the same number of protons.

Explanation:

Even though in isotopes, there's uneven number of neutrons, there's always same number of protons.

Hope it helps.

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Which of the following units is best when measuring the length of an object?
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Answer:metres

Explanation:It would be best to measure the length of an object in metric system such as millimeter, centimeter, mere etc..

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3 years ago
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What is the ratio of lactic acid (Ka = 1.37x^10-4) to lactate in a solution with pH =4.29
hram777 [196]

Henderson–Hasselbalch equation is given as,

                                         pH  =  pKa  +  log [A⁻] / [HA]   -------- (1)

Solution:

Convert Ka into pKa,

                                         pKa  =  -log Ka

                                         pKa  =  -log 1.37 × 10⁻⁴

                                         pKa  =  3.863

Putting value of pKa and pH in eq.1,

                                         4.29  =  3.863 + log [lactate] / [lactic acid]

Or,

                   log [lactate] / [lactic acid]  =  4.29 - 3.863

                   log [lactate] / [lactic acid]  =  0.427

Taking Anti log,

                             [lactate] / [lactic acid]  =  2.673

Result:

           2.673 M  lactate salt when mixed with 1 M Lactic acid produces a buffer of pH = 4.29.

6 0
3 years ago
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Answer:

its FALSE

Explanation:

FAKE   ITS NOT REAL

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As an alternative energy source, nuclear energy is more harmful to the environment than a coal-fired power plant because it prod
mel-nik [20]

Answer:

False

Explanation:

It is coal-fired power plants that produce mercury, air pollution, and carbon dioxide.  

However, nuclear energy produces radioactive waste that must be stored for many years before it can be safely disposed.

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A temperature change in a reaction indicates_____.
natita [175]

A temperature change in a reaction indicates a chemical change

8 0
2 years ago
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