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katrin2010 [14]
4 years ago
13

What year did mendeleev organized his periodic table in order of increasing atomic number

Chemistry
1 answer:
ELEN [110]4 years ago
6 0

Mendeleev organized his periodic table in order of increasing atomic number in 1869.

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Which of these is a base? a-vinegar b-ammonia c-HCl d- HNO3
Lady_Fox [76]
B- ammonia. ammonia has a pH level of about 11, and anything higher than 7  is more basic and anything less than 7 is more acidic. 7 is considered neutral.
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The volume of a gas is 0.30 L when the pressure is 4.00 atm. At the same temperature,
padilas [110]

Answer:

The presion is 0.6 atm

Explanation:

P1V1=P2V2

P2 = P1V1/V2

P2 = (4.00 atm * 0.30 L) / 2.0 L

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The picture below shows a sample from a tree.<br> What kind of tree is this?
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A 9.50 L balloon contains helium gas at a pressure of 680 mmHg. What is the final pressure in millimeters of mercury, of the hel
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5 0
3 years ago
The solubility of Cr(NO3)3⋅9H2O in water is 208 g per 100 g of water at 15 ∘C. A solution of Cr(NO3)3⋅9H2O in water at 35 ∘C is
Zinaida [17]

Answer:

102g of crystals

Explanation:

When the Cr(NO₃)₃⋅9H₂O is dissolved in water at 15°C, the maximum mass that water will dissolve in the equilibrium is 208 g per 100g of water. When you heat the water, this mass will increases.

In this problem, at 35°C the water dissolves 310g in 100g of water, as in the equilibrium at 15°C the maximum mass is 208g, the mass of crystals that will form is:

310g - 208g = <em>102g of crystals</em>

<em>-Crystals are the Cr(NO₃)₃⋅9H₂O that is not dissolved-.</em>

I hope it helps!

5 0
4 years ago
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