Answer:
B) 6.9 × 10⁻⁹
Explanation:
HZ is a weak acid that ionizes according to the following generic equation.
HZ(aq) ⇄ H⁺(aq) + Z⁻(aq)
First, we have to calculate the concentration of H⁺ using the pH.
pH = -log [H⁺]
[H⁺] = antilog -pH = antilog -4.93 = 1.17 × 10⁻⁵
Then, we have to calculate the initial concentration of the acid (Ca).
Finally, we can calculate the acid dissociation constant (Ka) using the following expression.
Answer:
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Calcium phosphide (CP) is the inorganic compound with the formula Ca3P2. It is one of several phosphides of calcium, being described as the salt-like material composed of Ca2+ and P3−.
Explanation:
Look on page 293 of your textbooks to fact check.The symbol for an alpha particle is 4/2 He.The super- script (4) is the mass number (the sum of the numbers of protons and neutrons).The subscript (2) is the atomic number (the number of protons).
Therefore the answer should be: Super-script 4 is the mass number, Subscript 2 is the atomic number
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Answer:
The correct option is;
The gas particles move faster, have the same molecular composition, and have weaker attractions between them than the liquid particles
Explanation:
The properties of the gas molecules in comparison to liquids are
1) The gas molecules are widely spread out
2) After evaporation and while in conditions favorable to the gaseous state, the kinetic energy of a gas is larger than the inter molecular attractive forces
3) A gas fills the container in which it is placed
For liquids
1) There are strong intermolecular forces holding the molecules together in a liquid
2) Liquid attractive forces in a liquid are strong enough to hold neighboring molecules
3) The volume of a liquid is definite.