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3 years ago

What were three new elements that were banned from being included on the Periodic Table? WHY?

1 answer:

7 0

Answer: They are Darmstadtium, or Ds, which has 110 protons in its nucleus and was named after the town in which it was discovered;

Roentgenium, or Rg, with 111 protons, named after the discoverer of X-rays Wilhelm Conrad Roentgen;

And Copernicium, or Cn, which has 112 protons and is named after the Polish astronomer Copernicus, who disrupted the view that the Earth was the center of the universe.

Explanation:

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Can somebody help me understand this

Komok [63]

I think it’s C. Marshmallow and toothpicks are used to show the composition of a water molecule

6 0

4 years ago

The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 2.0 rev/s in 10.0 s. At th

Arte-miy333 [17]

Answer:

22 revolutions

Explanation:

2 rev/s = 2*(2π rad/rev) = 12.57 rad/s

The angular acceleration when it starting

$\alpha_a = \frac{\Delta \omega}{\Delta t} = \frac{12.57}{10} = 1.257 rad/s^2$

The angular acceleration when it stopping:

$\alpha_o = \frac{\Delta \omega}{\Delta t} = \frac{-12.57}{12} = -1.05 rad/s^2$

The angular distance it covers when starting from rest:

$\omega^2 - 0^2 = 2\alpha_a\theta_a$

$\theta_a = \frac{\omega^2}{2\alpha_a} = \frac{12.57^2}{2*1.257} = 62.8 rad$

The angular distance it covers when coming to complete stop:

$0 - \omega^2 = 2\alpha_o\theta_o$

$\theta_o = \frac{-\omega^2}{2\alpha_o} = \frac{-12.57^2}{2*(-1.05)} = 75.4 rad$

So the total angular distance it covers within 22 s is 62.8 + 75.4 = 138.23 rad or 138.23 / (2π) = 22 revolutions

6 0

4 years ago

An experiment yielded the above temperature and time information. what is the freezing point of the material in this experiment

Dmitry [639]

The answer is 0 degrees Celsius (0°C). It will be where the line flat lines the first time. The second time would be the boiling point. An experiment yielded the above temperature and time information. The freezing point of the material in this experiment if the material is a solid at time zero is 0 degrees Celsius (0°C) .

7 0

4 years ago

Which statement best explains how isotopes can have different masses and still be the same element?

ss7ja [257]

Your list of choices is a very short list, and doesn't include any
correct explanation.

The mass of an atom is roughly the number of protons AND neutrons
in its nucleus, but the element only depends on how many protons are there.

Different atoms of the same element may have different numbers of
neutrons, so their masses are different. But they're the same element,
because they all have the same number of protons.

3 0

3 years ago

How many atoms are in one mole of potassium

Svetach [21]

Answer : 6.022• 10^23 atoms of potassium

5 0

3 years ago