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I am Lyosha [343]
3 years ago
7

Indicate how many significant figures in the following number 1.080

Chemistry
1 answer:
Lesechka [4]3 years ago
5 0

Answer:

4

Explanation

Trailing zeros in decimals count as significant figures.

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Consider the elements bromine and chlorine; which element has a larger ionic radius
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Bromine has one more electron shell than the chlorine atom making the radius larger than the chlorine atom.
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3 years ago
At pH= 8, which species is most likely to predominate in solution? pKa (-NH3+) = 9.9, pKa (-COOH) = 2.3
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Answer:

The NH3 + with a PKa = 9.9

Explanation:

The Pka is a mathematical expression to express the dissociation grade of a substance in a solution, that means with a substance with a pKa small is a strong acid, and in this case since the solution pH is 8, that mean that the substance with high pKa ( lower acid strength)  will predominate in a pH of 8.

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3 years ago
Which has greater mass?
kaheart [24]

Answer:

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Explanation:

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3 years ago
Ernest Rutherford's experiment led him to change the outlook on atom because
qaws [65]

Answer:

What led him to change his outlook was because in his experiment, when he fired positively charged alpha particles at a piece of gold foil, he observed that some of the alpha particles were deflected to some degree, and some others bounced back directly toward him.

Explanation:

In his experiment, he fired positively charged alpha particles at a piece of gold foil.

Now, after doing that he observed that some of the alpha particles were deflected to some degree, and some others bounced back directly toward him.

After those observations, he felt that for the order of the alpha particles to have been deflected, they would possibly have been hit or come close to being hit by a positively charged particle in the atom. This made him to conclude that an atom consists mostly of empty space, with a very small and dense but positively charged nucleus at the center. And that this nucleus contains most of the mass of the atom, while the electrons orbit the nucleus.

6 0
3 years ago
4) Which of the following events can change the
Phantasy [73]

Answer: Option D) All of the above.

Explanation:

The ecosystem is made up of living and non-living component relating with their environment. i.e in an ecosystem, plants and animals relate with the food nutrients, climate and weather conditions, soil structure etc

Thus, all of the conditions: a rise in temperature; natural disaster like flooding; the introduction of a new animal species like a predator will definitely change the previously stable condition of an ecosystem.

6 0
2 years ago
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