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Vanyuwa [196]
3 years ago
15

What’s some facts about atoms and elements

Chemistry
2 answers:
Ilya [14]3 years ago
6 0

Answer:

There are alot of facts but here are a few

Explanation:

Atoms:

There are 3 parts to an atom

Protons have a positive electrical charge

Atoms are the smallest particles to make an element

Elements:

Hydrogen is the most common element in the world

An element is a substance that is made entirely from one type of atom.

An element is a substance that cannot be broken down into any other substance.

Contact [7]3 years ago
3 0

Answer:

Dmitri Mendeleyev is the inventor of the modern periodic table.

The majority of the elements are metals.

Atoms are made of tiny particles called protons, neutrons and electrons. Protons and neutrons clump together to form a central nucleus. The electrons move in a cloud-like region around the nucleus.

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How is hydrogen in heavy water different from hydrogen in normal water?
tatyana61 [14]

Answer:

I'd say the correct answer is A

Explanation:

hope this helps:)

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6 0
2 years ago
Fill in the missing data point. Show all calculations leading to an answer.
Aleksandr-060686 [28]

Answer:  

1090 mmHg  

Explanation:  

We know that with gases we must use a Kelvin temperatures, so let’s try a plot of pressure against the Kelvin temperature.  

We can create a table as follows  

<u>t/°C</u>  <u>T/K</u>  <u>p/mmHg</u>  

  10   283      726  

  20  293      750  

  40   313      800  

  70  343      880  

100  373       960  

150  423        ???  

I plotted the data and got the graph in the figure below.  

It appears that pressure is a linear function of the Kelvin temperature.  

y = mx + b  

where x is the slope and b is the y-intercept.

===============

<em>Calculate the slope  </em>

I will use the points (275, 700) and (380, 975).  

Slope = Δy/Δx = (y₂ - y₁)/(x₂ -x₁) = (975 -700)/(380 – 275) = 275/105 = 2.619  

So,  

y = 2.619x + b  

===============

<em>Calculate the intercept </em>

When x = 275, y = 700.  

700 = 2.619 × 275 + b  

700 = 720 + b     Subtract 720 from each side and transpose.  

b = -20  

So, the equation of the graph is  

y = 2.619x -20  

===============

<em>Calculate the pressure</em> at 423 K (150°C)  

y = 2.619 × 423 - 20  

y = 1110 - 20  

y = 1090

At 150 °C, the pressure 1090 mmHg.  

The point is approximately at the position of the black dot in the graph.  

7 0
3 years ago
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suter [353]

Answer:We decided to pasteurize the documents for safekeeping

Explanation:

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What is the relationship between the kinetic energy of molecules in an object and the object's temperature?
Natalija [7]

Answer: as the temperature increases, the kinetic energy of the molecules increases

Explanation: The kinetic energy of the molecules is the energy possessed by virtue of motion of the particles.

Kinetic energy of the particles is directly proportional to the temperature of the gas.

K.E=\frac{3RT}{2}

where T= temperature

R= gas constant

Thus if the temperature is increased, the molecules start moving more randomly and gain kinetic energy.



8 0
3 years ago
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What are all four Quantum numbers of 11th electron of magnesium​
ruslelena [56]

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Explanation:

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3 years ago
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