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dangina [55]
3 years ago
8

Which of these pairs of elements have the same number of valence electrons

Chemistry
1 answer:
erastovalidia [21]3 years ago
6 0
Beryllium (Be) and Calcium (Ca)
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Combining the two clear colorless liquids is a chemical change.

Explanation:

Because a different solid substance is formed. Tell students that a precipitate is an insoluble solid that forms when two solutions are combined and react chemically. Insoluble means that the solid will not dissolve.

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3 years ago
Calculate the total pressure in a 10.0 liter flask at 27°C of a sample of gas that contains 6.0 grams of hydrogen, 15.2 grams of
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The total pressure is 27.8 atm

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From the ideal gas equation,

PV = nRT

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What is the notation for the enthalpy of solution?
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The enthalpy<span> of </span>solution<span>, </span>enthalpy<span> of dissolution, or heat of </span>solution<span> is the</span>enthalpy<span> change associated with the dissolution of a substance in a solvent at constant pressure resulting in infinite dilution. The </span>enthalpy<span> of </span>solution<span> is most often expressed in kJ/mol at constant temperature. </span>
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