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guajiro [1.7K]
3 years ago
11

Which of these is a pure substance

Chemistry
1 answer:
Galina-37 [17]3 years ago
4 0

Both A and B are the answer.


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How valence electrons are arranged in a lewis dot diagram?
choli [55]

Explanation:

In a Lewis dot diagram, the electrons are arranged so that, when full, two electrons placed beside each other are on four sides of the element symbol.

An electron is 3-dimensional, so you can start on any side on a 2D diagram.

Continue this pattern depending on how many electrons you have:

When adding an electron after the first, it is placed on the next side going either counterclockwise or clockwise. Which ever direction you choose, be consistent.

After the fourth electron, so that one electron is on each side, place a dot beside your first electron and continue the pattern.

8 0
4 years ago
How many moles of gas would occupy a 25.0 liter when the temp is 22.0 degrees celsius and the pressure is 646 torr
Luda [366]

Answer:

0.877 mol  

Step-by-step explanation:

We can use the<em> Ideal Gas Law </em>to solve this problem.

pV = nRT     Divide both sides by RT

 n = (pV)/(RT)

Data:

p = 646 torr

V = 25.0 L

R = 0.082 06 L·atm·K⁻¹mol⁻¹

T = 22.0 °C

Calculations:

(a) <em>Convert the pressure to atmospheres </em>

p = 646 torr × (1 atm/760 torr) = 0.8500 atm

(b) <em>Convert the temperature to kelvins </em>

T = (22.0 + 273.15) K = 295.15 K

(c) <em>Calculate the number of moles </em>

n = (0.8500 × 25.0)/(0.082 06 × 295.15)

  = 0.877 mol

3 0
3 years ago
Which of the following is NOT a property of an acid?
MrMuchimi

the correct answer is feels slippery

5 0
3 years ago
Which statement about metamorphic and sedimentary rocks is true?
yaroslaw [1]
<span>The answer is C. Earth movements can origin rocks to be intensely suppressed or clutched. As an outcome, the rocks are heated and put below unlimited pressure. They do not dissolve, but the minerals they cover are altered chemically, making metamorphic rocks.</span>
5 0
4 years ago
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How can the rate of a reaction be increased?
Nana76 [90]
I think it may be A.
But I'm not sure






4 0
3 years ago
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