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ycow [4]
3 years ago
11

As the water molecules heat up they become more dense and float to the top. True or False

Physics
1 answer:
miss Akunina [59]3 years ago
8 0

Answer: False but read why

Heated water molecules expands ( become less dense) but they do float to the top.

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Which statement is true about effective nuclear charge?a. Effective nuclear charge decreases as we move to the right across a ro
MissTica

Answer:

Option b. Effective nuclear charge increases as we move to the right across a row in the periodic table

Explanation:

The <em>effective nuclear charge </em>is a measure of how strong the protons in the nucleus of an atom attract the outermost electrons of such atom.

The <em>effective nuclear charge</em> is the net positive charge experienced by valence electrons and is calculated (as an approximation) by the equation: Zeff = Z – S, where Z is the atomic number and S is the number of shielding electrons.

The shielding electrons are those electrons in between the interesting electrons and the nucleus of the atom.

Since the shielding electrons are closer to the nucleus, they repel the outermost electrons and so cancel some of the attraction exerted by the positive charge of the nucleus, meaning that the outermost electrons feel less the efect of attraction of the protons. That is why in the equation of Zeff, the shielding electrons (S) subtract the total from the atomic number Z.

The <em>effective nuclear charge</em>, then, is responsible for some properties and trends in the periodic table. Here, you can see how this explains the trend of the atomic radius (size of the atom) accross a row in the periodic table.

  • As the<em> effective nuclear charge</em> is larger, in a same row of the periodic table, the shielding effect is lower, the outermost electrons are more strongly attracted by the nucleus, and the size of the atoms decrease. That is why as we move to the right in the periodic table, the size of the atoms decrease.

3 0
3 years ago
A boy and his skateboard have a combined mass of 65 kg. What is the speed of the boy and skateboard if they have a momentum of 2
Yanka [14]
4.2m/s. Momentum=mass x velocity so 275/65=velocity=4.23
3 0
3 years ago
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Can someone help with number 4 please
kondaur [170]
The way I look at these things is like this:

-- The runner covered 12 meters in 4 seconds.
Average speed = 3 meters per second.

-- Speed at the beginning = zero.
In order to make the average 3, Speed at the end = 6 meters per second.

-- Speed increased from zero to 6 meters per second in 4 seconds.
It must have increased 1.5 meters per second each second.

That's choice-#2.
4 0
3 years ago
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The objects shown in the following diagrams have different masses and are different distances apart. Which diagram shows the two
sergiy2304 [10]

Answer:

C. 10kg to 10kg

Explanation:

You have to picture to it I think

5 0
2 years ago
Energy can be changed from one form to another. Which terms can be used to describe these changes? Check all that apply.
Dominik [7]

Answer:

A Energy Conversion

B Energy Conservation

D Energy Transformation

4 0
3 years ago
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