We can predict formula of ionic compounds by:
- Take a look at where the elements are listed on the periodic table.
- The amount of electrons that an element would need to gain or lose in order to resemble an atom of a nearby noble gas is one of the similarities that atoms in the same column as one another (group) tend to display.
- Alkali metal group I ions have +1 charges.
- Alkaline earth metals (group 2 ions) have a +2 charge.
- Nonmetal group 6 ions have a charge of -2.
- Halides in group 7 have a -1 charge.
- The charges of the transition metals cannot be predicted in a straightforward manner.
- Check out a table of charges (valences) to see potential values. The +1, +2, and +3 charges are most frequently employed in beginning and general chemistry courses.
- Keep in mind that the positive ion is always stated first when writing an ionic compound's formula.
These are the few guidelines we can use to product formula.
Learn more about ionic compounds here:
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The answer is 6.022• 10^23 atoms
Answer:
Explanation:
Hello,
Starting by the ideal gas law which always involves absolute temperatures:
At the initial given conditions, the moles are computed, assuming they are constant:
Now, by solving for the volume at the new pressure and temperature we get:
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Answer: Sublimation
Explanation:
Frost forms when an outside surface cools past the dew point. The dew point is the point where the air gets so cold, the water vapor in the atmosphere turns into liquid. As cool air collects in valleys, frost forms. Frost usually forms at night, when the air temperature is cooler.
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Answer:
4.96 x 10²²atoms
Explanation:
Given parameters
Mass of Ba = 11.3g
Unknown:
Number of atoms = ?
Solution:
To solve this problem, we need to find the number of moles of Ba first and then the number of atoms it contains.
Number of moles = 
Molar mass of Ba = 137.3g/mol
Number of moles = 
= 0.08mole
1 mole of a substance contains 6.02 x 10²³ atoms
0.08 mole of Ba will contain 0.08 x 6.02 x 10²³ atoms = 4.96 x 10²²atoms
