CHEMISTRY HIGH SCHOOL

What is the approximate mass of one mole of zinc?a. 30 g
b. 35 g
c. 65 g
d. 6.02 × 1023 g

Answers

Answer 1
Answer: The answer is (a) 30g. Zinc = 30. 1 mole = 30 x 1 = 30g

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What mass of sodium hydroxide is needed to make 0.500 L of 2.50 M NaOH ?

Which equations shows the complete dissociation of a strong base? HCl -> cl- + H+

HNO2 -> H+ + NO2-

HA + h20 -> A- + H+ + h20

BOH + h20 -> B+ + OH- + H20

Answers

The correct answer is the fourth option. The complete dissociation of a strong base is BOH + h20 -> B+ + OH- + H20 since this is the only base from the choices given. A base is a substance that accepts hydrogen ions. 

Answer : The correct option is, (4) BOH+H_20\rightarrow B^++OH^-+H_20

Explanation :

Strong acid : Strong acids are those acids which are completely dissociates into ions in water. It dissociates into hydrogen ion and an anion.

Strong base : Strong base are those base which are completely dissociates into ions in water. It dissociates into hydroxide ion and a cation.

In all the given options, option (4) BOH+H_20\rightarrow B^++OH^-+H_20 equation shows the complete dissociation of a strong base.

While the other options shows the complete dissociation of an acid.

A bond exists between A and B in the compound AB. A and B are sharing electrons. The type of bond is ____

Answers

Answer: Covalent

Explanation:

A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals.  Example: H_2

An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal. Example: NaCl

Thus bond formed by sharing of electrons is covalent bond.
They are covalent bonds.
Covalend bonds share
Ionic bonds transfer

Which atom has the least attraction for the electrons in a bond between that atom and an atom of hydrogen?(1) carbon
(2)nitrogen
(3)oxygen
(4) fluorine

Answers

Answer:

(1) Carbon

Explanation:

Then we are looking for attraction of electrons in a bond towards one element, we are looking at polar covalent bonds and electronegativity of the compound elements.

Polar Covalent Bonds - A pair of electrons that are bonded and are unequally shared between the 2 elements. It's bond value is from 0.4 < x < 1.7.

Electronegativity - The ability of an atom in a molecule to attract shared electrons to itself. The general trend of increasing Electronegativity is up and to the right of the Periodic Table.

Carbon is Element 6 in Period 2 Group 14.

Nitrogen is Element 7 in Period 2 Group 15.

Oxygen is Element 8 in Period 2 Group 16.

Fluorine is Element 9 in Period 2 Group 17.

Remember our trend for Electronegativity. If that is the case, the Fluorine would be the most electronegative, meaning it would attract shared electrons and hold on to them very strongly. Therefore, it would have a very strong attraction for Hydrogen's lone electron, as Fluorine wants to fill it's valence electron shell fully, from 7 to  8.

Therefore, the least attraction and the least electronegative element in the list is Carbon.

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Answers

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What is observed when an iron bar is dipped into a solution of silver nitrate​

Answers

Answer:

I think it will start to have a greenish color and get lighter

Explanation:

Compare the reactivity of alcohols with the length of the R-group.

Answers

The longer the alkyl chain is, the lesser the reactivity of the alcohol and vice versa.

What are alcohols?

Alcohols are substances that possess the -OH functional groups. We know that the reactivity of the alcohol depends on the length of the alkyl group.

Now, the longer the alkyl chain is, the lesser the reactivity of the alcohol and vice versa. This is why the rate of reaction of high molecular weight alcohols is low.

Learn more about alcohols:brainly.com/question/4698220?r

#SPJ2
As you increase the chain of a alcohol, the reactivity decreases. This is due to an increase in disorder and decrease in intermolecular attraction between molecules.
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