Answer:
metalloids
Explanation:
The kind of element most likely used to make semiconductors are the metalloids.
These elements have properties between those of metals and non-metals in that they are not truly metals and are partly non-metals.
- Under certain conditions they show features of metals or non - metals.
- The class of these elements are the metalloids.
- They are used to make semiconductors which are major components of electronics.
The chemical formula for calcium hydroxide is Ca(OH)₂ and that of nitric acid is HNO₃. By these chemical formula it can be deduced that the number of equivalents per mole of Ca(OH)₂ is 2 because of 2 OH⁻ and for HNO₃ is 1 because of H⁺.
For the neutralization reaction, the number of equivalents should be equal.
V₁n₁ = V₂n₂
Substituting the known values and with the incorporation of the concept above,
(V₁)(0.0250 mol/L)(2 equivalents/mol) = (33.50 mL)(0.020 mol/L)(1 equivalent/mol)
V₁ = 13.4 mL
Hence, the volume of calcium hydroxide needed is approximately equal to 13.4 mL.
Answer:
Try to think those who are made from amino acid... melatonina it is a tryptophan precursor, norepinephrine comes from tyrosine, epinephrine also comes from tyrosine and phenylalanine, the thyroid hormone comes from tyrosine too, but the TSH is derivated from TRH. Last option is not an amino acid derivative.
Explanation:
Answer:
See Explanation
Explanation:
Pb2O3 is better formulated as PbO.PbO2. It is actually a mixture of the two oxides of lead, lead II oxide and lead IV oxide.
This implies that this compound Pb2O3 (sometimes called lead sesquioxide) is a mixture of the oxides of lead in its two known oxidation states +II and +IV.
Hence Pb2O3 contains PbO and PbO2 units.
MHCl: 1+35,5 = 36,5 g/mol
36,5g ---- 1 mol
21g ------- X
X = 0,575 mol
C = n/V
V = n/C
V = 0,575/4,3
V = 0,1337 L = 133,7 mL
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