Answer:
Metalloids, also known as semimetals are elements containing properties similar and midway between metals and nonmetals. They are found to divide the periodic table between the metals on the left and the nonmetals on the right. Metalloids often have the following properties: could be dull or shiny.
Co2
Explanation:
CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (l)
Answer:
Genes Rule
Explanation:
The color of a dog's coat is basically at the mercy of his gene pool. Genes do two things that determine a dog's appearance. They control the pigments produced (eumelanin and phaeomelanin) and where these pigments are produced.
Answer:
It loses kinetic energy.
Explanation:
The definition of heat is molecules moving fast, so it cooling would mean they slow down.
Answer:
1. Ka = 8.16x10⁻⁵
2. pH = 2.40
Explanation:
1. The dissociation of a weak acid in water occurs as follows:
HA ⇄ H⁺ + A⁻
Ka = [H⁺] [A⁻] / [HA]
As 2% of the 0.20M solution is dissociated:
[H⁺] = [A⁻] = 0.20M * 2% = 0.004M -As H⁺ and A⁻ comes from the same reaction, their concentrations are the same
[HA] = 0.20M * 98% = 0.196M
Ka = (0.004)² / (0.196M) = 8.16x10⁻⁵
2. pH = -log [H⁺] = -log [0.004M]
<h3>pH = 2.40</h3>