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Ulleksa [173]
3 years ago
8

What is the mass number of 207Pb ? A: 289 B: 207 C: 125 D: 82

Chemistry
1 answer:
Sergio [31]3 years ago
3 0
207 is the mass number. 82 would be the atomic number
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Two liquids that are soluble in each other in any proportion are said to be what?
Romashka-Z-Leto [24]
When two liquids are completely soluble in each other in all proportions, they are said to be miscible<span>. For example, ethanol and water are </span>miscible<span>. If the liquids do not mix, they are said to be </span>immiscible<span>.</span>
8 0
4 years ago
A kno3 solution containing 51 g of kno3 per 100.0 g of water is cooled from 40 ∘c to 0 ∘c. what will happen during cooling?
Gre4nikov [31]

Answer:

As, the temperature decreased from 40.0 °C to 0.0 °C an amount will be recrystallized and precipitated as solid crystals in the water (51.0 g - 14.0 g = 37.0 g) and 14.0 g will be dissolved in water.

Explanation:

  • Firstly, we must mention that:

The solubility of KNO₃ per 100.0 g of water at 40.0 °C = 63.0 g.

The solubility of KNO₃ per 100.0 g of water at 0.0 °C = 14.0 g.

  • So, at 40.0 °C, 51.0 g of KNO₃ will be completely dissolved in water.
  • <em>As, the temperature decreased from 40.0 °C to 0.0 °C an amount will be recrystallized and precipitated as solid crystals in the water (51.0 g - 14.0 g = 37.0 g) and 14.0 g will be dissolved in water.</em>
5 0
3 years ago
Which element would release the most energy while adding an electron to a neutral atom in the gas phase?
JulijaS [17]
Answer: bromine

Explanation: Thus bromine would release most energy while adding an an electron to a neutral atom in the gas phase.
5 0
3 years ago
Hydrogen is grouped with the alkali metals because it
loris [4]

Answer:

Hydrogen is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkali metals.

Explanation:

5 0
3 years ago
2.4 moles of NO, 2.4 moles of Oz, and 2.4 moles of H2O react
Len [333]

Answer:

83%

Explanation:

2.4 moles of NO, 2.4 moles of O2, and 2.4 moles of H2O react to form 2.0 moles of HNO3. What is the percent yield of this reaction? ___ % 83.

7 0
3 years ago
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