Answer:
Ka= 2.3 x 10^-11
Explanation:
so Ka x Kb = Kw where Kw=10^-14 at 25 degrees Celsius
plugging in Kb and Kw, we have
Ka x 4.4 x 10^-4 = 10^-14
solving for Ka,
Ka= (10^-14)/(4.4 x 10^-4)
Ka= 2.3 x 10^-11
There is one simple way to determine between solids, liquids, and gases. Are you able to move the substance? And if you are, how does it move? If it takes on the shape of its new container, it is a liquid. For example, if you pour water from a cup into a bowl, it will fill the bowl, not stay in the same shape as it was in the cup. However, if you put a marble in a cup and then pour the marble into the bowl, it will remain the same shape, and is therefore a solid. If you move a gas into a container, and the container is not sealed, it will not remain in the same shape.
Answer:
<em>The answer to your question is </em><em>c. H2O</em>
Explanation:
<em>a. CaCO3 ----> Calcium Carbonate is obviously not a binary compound because it contains more than two elements. </em>
<em>b. CuSO4 ----> CuSO4 stands for copper(II) sulfate. Sulfate is the polyatomic ion SO4 -2.</em>
<em>c. H2O ----> Binary molecular compounds are composed of only two elements. Examples are H2O, NO, SF6 etc. </em>
<em>d. Pb(NO3)2 ----> Lead(II) nitrate is an inorganic compound with the chemical formula Pb(NO3)2.</em>
<em>I hope this helps and have a great day!</em>
Answer:
it is a molecule
Explanation:
it is not a compound because compounds are made up from two or more different elements
Answer is: c. MgSO₃.
In magnesium sulfite, magnesium has oxidation number +2, sulfur has oxidatidion number +4 and oxygen -2:
+2 + (+4) + 3·(-2) =0.
a) in calcium sulfide, calcium has oxidation number +2 and sulfur -2:
+2 + (-2) = 0.
b) in sodium nitride, sodium has oxidation number +1 and nitrogen -3:
3 · (+1) + (-3) = 0.
d) in aluminium nitrite, aluminium has oxidation number +3, nitrogen +3 and oxygen has -2:
+3 + (+3 + 2 · (-2)) · 3 = 0.
