Answer:
Explanation:
Option D is the correct answer
Answer:
A B C D (all of the above)
Explanation:
Weak acid do not have a much hydrogen ions when in liquids or aqueous solutions. Examples of weak acids include vinegar, citric acid (from oranges, lemons, etc)
Answer: A chemical equilibrium exists when the rate at which reactants form products is the same as the rate at which products form reactants.
Explanation:
When the concentration of both the reactants and products do not change with time then it means the chemical reaction has reached to a state of chemical equilibrium.
For example,
Therefore, we can conclude that a chemical equilibrium exists when the rate at which reactants form products is the same as the rate at which products form reactants.
Answer:. Ca should displace Mn
Explanation:
Calcium is high up in the activity series of metals. Calcium has a very negative redox potential of -2.87 V, next only to potassium. Transition metals of which Manganese is one, does not have such very negative redox potentials so they can easily be displaced by a more highly reactive metal such as Calcium. Elements of group 1 and 2 are very highly reactive.
"Taconian orogeny" mountain-building event occurred in New York State during the time when Valcouroceras was living in oceans covering parts of New York State.
<u>Option: C</u>
<u>Explanation:</u>
A timeframe of mountain construction, which ended 440 million years earlier is known as the Taconic orogeny. A tremendous network of mountains developed from eastern Canada down to what is today the US East Coast Piedmont.
As the mountain range deteriorated during the Silurian and Devonian periods, sediments from the mountain range dispersed across the Appalachians and midcontinental North America of today. It took place when a terrane or sequence of terranes i.e volcanic arcs and microcontinents collide with east North America in a subduction zone that dips east.