Explanation:
Volume of solid metal = 102.6ml - 100ml = 2.6ml.
Mass of solid metal = 50g.
Density = Mass / Volume = 50g / 2.6ml = 19.2g / cm³.
Also from our knowledge, only gold metal is yellowish here.
Hence the answer is gold metal.
Answer:
your answer is b. chlorofluorocarbon(CFC
Explanation:
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Answer:
(B) 3
Explanation:
Citric acid has an acid dissociation constant (Ka) of 8.4 × 10⁻⁴. When it forms a buffer with its conjugate base (citrate), we can calculate the pH using the Henderson-Hasselbalch's equation.
The optimum range of pH is pKa ± 1. The pKa is -log Ka = -log (8.4 × 10⁻⁴) = 3.1. The buffer would be more effective for pH between 2.1 and 4.1, especially around 3.1. So the best choice is (B) 3.
Pb(NO3)2 + 2KCl ------) PbCl2 + 2KNO3
Pb+2 + 2Cl- ---------) PbCl2
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