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Alchen [17]
3 years ago
12

Given his arrangement of the periodic table, Mendeleev was able to predict three elements that had not yet been discovered. He p

redicted their atomic weights and chemical properties. How was this possible?
Chemistry
1 answer:
quester [9]3 years ago
6 0

Answer:

Look in explanation.

Explanation:

Mendeleev has ordered the elements based on increasing atomic mass, he has skipped some elements but assumed that they existed and managed to find the atomic mass of the "unknown" elements.

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Arrange the following oxides in order of increasing acidity.
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Answer:

Based on the Modern Periodic table, there is an increase in the electropositivity of the atom down the group as well as increases across a period. On comparing the electropositivities of the mentioned oxides central atom, it is seen that Ca is most electropositive followed by Al, Si, C, P, and S is the least electropositive.  

With the decrease in the electropositivity, there is an increase in the acidity of the oxides. Thus, the increasing order of the oxides from the least acidic to the most acidic is:  

CaO > Al2O3 > SiO2 > CO2 > P2O5 > SO3. Hence, CaO is the least acidic and SO3 is the most acidic.  

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Can someone help me pls
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Describe an adaptation to a plant's life cycle and explain how this adaptation helps the plant survive. (2 points)
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Aquatic plants that live underwater have leaves with large air pockets inside that allow the plant to absorb oxygen from the water.

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2 years ago
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Geologists discover what seems to be a new, powdery substance, deep underground. When they analyze it it's found to contain, amo
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Explanation b:

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11. What is the concentration (in M) of an ammonia (NH3) solution if 12.23 grams of ammonia are
photoshop1234 [79]

Answer:  1.284M NH3

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