Answer:
Non metals gain electrons in a ionic bond
Explanation:
Hope it helps you!
Answer:
3.18x10⁻³
Explanation:
The equilibrium of a weak acid can be written as:
And Ka can be expressed as:
- Ka=
<u><em>Keep in mind that [H⁺] = [A⁻]</em></u>.
We can<u> calculate [H⁺] from the pH</u>:
- [H⁺]==0.0158
Now we <u>compute the calculated [H⁺]</u> (and [A⁻]) <u>with the [HA] given by the problem</u>:
Ka = = 3.18x10⁻³
Answer:
I cannot give you all the answer but I can help you to solve those.
Explanation:
The first question:
How many grams are there in 7.5× molecules of ?
So we need to find the molecular mass first, use your periodic table,
And then we can find out 2+32+16×4=98 g/mol
Then, we need to find how many moles, by using Avogadro's constant:
Avogadro's constant: 1 mole = 6.02×
∴=1.25 mol(2d.p.)
Lastly, find the grams using the formula
m=Mn
m=1.25*98
m=122.5g
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In conclusion, use those formula to help you:
(which M = molecular mass(atomic mass) m=mass of the substance and n = moles)
Avogadro's constant:
Answer:
4 L or 4000 mL
Explanation:
This question asks for the use of combined gas law:
(P1)(V1) / (T1) = (P2)(V2) / (T2)
...where pressure (P) is in atm, volume (V) is in liters, and temperature (T) is in kelvin.
1000 ml is 1 L, and everything else is already in the right units.
(1 atm)(1 L) / (20 K) = (0.5 atm)(V2) / (40 K)
Just solve the equation for V2, and you get a new volume of 4 liters
(1)(1) / (20) = (.5x) / (40)
1 / 20 = .5x / 40
2 = .5x
x = 4
The 3 or i think 2nd row not sure