Answer:
D. almost all atoms strive to have eight valence electrons.
Explanation:
The octet rule is a chemical rule of thumb that states that the observation that elements tend to bond in a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.
Exceptions to this rule, This octet rule is only applicable to main group elements but there are many molecules that do not obey this octet rule.
These molecules are divided into two types: unstable intermediates; that react so as to attain stability, and stable molecules that follow other electron counting rules.
Answer:
x=-1
Explanation:
1. Simplify brackets.
2x+3×6x=−20
2. Simplify 3×6x to 18x.
2x+18x=−20
3. Simplify 2x+18x to 20x.
20x=−20
4. Divide both sides by 20.
x=−1
chemical reaction results in the forming or breaking apart of chemical bonds between various elements. These reactions can result in many different outcomes, which can be affected by temperature, pressure and the amount of the reactants. Catalysts can also start a reaction or speed up its rate. However, the catalyst is not involved in the chemical reaction, as it remains unchanged before and after the reaction.
Although the elements and compounds may change form during the reaction, every atom in the reactants is also found in one of the products. In the reaction, individual elements can bond together to form compounds, or compounds can break apart into elements. For instance, when water is exposed to an electrical current, it breaks apart into oxygen and hydrogen gases. Alternatively, when zinc and sulfur react together, the two elements bond together to form zinc sulfide.
Some reactions also result in chemical equilibrium, which occurs when the reactants change into products at the same time as the products change back into the original reactants.
Answer:
-- Volume of base used
--- Molarity of base
Explanation:
Given
-- Volume of acid used
--- Buret Initial reading
--- Buret Final reading
--- Molarity of the acid
Solving (a): Volume of base used (VB)
This is calculated by subtracting the initial reading from the final reading of the base buret.
i.e.
Solving (b): Molarity base (MB)
This is calculated using:
Make MB the subject
This gives:
Solving (c): <em>There is no such thing as average molarity</em>
