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Kazeer [188]
3 years ago
11

Which of the following ideas about the atom changed when new evidence was discovered?

Chemistry
1 answer:
poizon [28]3 years ago
7 0

Answer:

Atoms cannot be divided.

Explanation:

Earlier the following points were proposed for an atom that:

A. Elements are different kinds of atoms. : For example atom of oxygen will be different from atom of carbon.

B. All matter is made up of atoms: it is also true that whatever matter we observe is made up of some atom. Either it is a mixture or pure substance.

C. Atoms cannot be divided: This is not true. Further scientific studies showed that an atom can further be divided into sub atomic particles electrons, neutrons and protons. Thus the idea of indivisibility of an atom changed when new evidence was discovered.

D. Atoms are made up of smaller particles: It is true as atoms are made up of sub atomic particles.

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Newton first law of motion

Explanation:

This law by Newton states that an object will remain at rest, or a moving object will stay in motion in a straight line and with the same speed unless an external and unbalanced force acts on the object.

One application of this Newtonian law is in the launching of projectiles like ballistic missiles.  A ballistic missile parabolic path is affected by its inertia and the unbalanced forces acting on the object such as air resistance/ drag and gravity.

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What are centimeters, kilometers, and millimeters?
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Answer:

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4 0
4 years ago
What is the ratio of lactic acid (Ka = 1.37x10-4) to lactate in a solution with pH =4.49?
Natasha2012 [34]
When Ka =1.37 x 10^-4 

∴Pka = - ㏒Ka

          = -㏒ 1.37 x 10^-4 
          
           = 3.86

According to H- H equation: 

when PH = PKA + ㏒[conjugate base / weak acid]

when the lactate is the conjugate base and lactic acid is the weak acid 

∴ PH = Pka +㏒[lactate] / [lactic acid]

so, by substitution:


4.49 = 3.86 + ㏒[lactate]/[lactic acid]

∴[lactate]/[lactic acid] = 4.3

∴ [lactic acid] / [lactate] = 1/4.3 
            
                                        = 0.23
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3 years ago
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