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Readme [11.4K]
3 years ago
8

Which statement concerning spontaneous chemical reactions is true?

Chemistry
1 answer:
Marina CMI [18]3 years ago
7 0
I believe the correct answer is b since a spontaneous reaction is self sufficient and should not need an ongoing out side source in order to proceed once it is started.  

a is false since some reactions that occur are relatively slow such as iron reacting with oxygen to make rust.

c is false since most reactions involve an energy change of some sort which is why we classify them as endothermic or exothermic.

d is false since catalysts help speed up reactions but do not really affect a the Gibbs free energy value which determines the spontaneity of the reaction.
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3 years ago
How are the terms molar mass and atomic mass different from one another
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8 0
3 years ago
Which of these statements about atomic models is most likely correct?
taurus [48]

Answer:

The correct option is the second option

Explanation:

Generally, the aim of science is to understand a particular concept in the best and the most correct way possible; hence experiments are done and repeated to ensure an explanation is actually true about a concept or need modification.

The atomic models have also been a "beneficiary" of this process. The different atomic models are usually been improved upon as scientists leaned more. For example, the Dalton's atomic theory has been modified to a more correct atomic description; some of which are shown below

(1) Dalton's theory suggested that an atom is the smallest unit of a molecule. We know now from different experiments (by J. J Thompson and Rutherford) that atoms are not the smallest molecules and are made up of smaller particles known as protons, neutrons and electrons.

(2) Dalton's theory suggested that atoms of the same elements are alike in all aspects. The knowledge of isotopy shows this is not always the case. As atoms of the same elements (isotopes) have the same atomic number but different mass number; hence cannot be said to be the same in all aspects.

(3) Dalton's theory also suggested that when atoms react, they do so in fixed, simple whole number ratio. The knowledge of organic chemistry shows atoms do not always react in simple whole number ratios

There are several modifications to different postulations by scientists that have also occurred aside from this, hence the most correct answer is that "As scientists learned more, they modified the atomic model"

5 0
3 years ago
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