CHEMISTRY HIGH SCHOOL

Which of the following compounds does NOT contain molecules?a. H2
b. NaCl
c. CO2
d. H2O

Answers

Answer 1
Answer:

Answer:

NaCl does not contain molecules

Explanation:

Molecules are made of multiple atoms bonded together to form a single entity.

In H_(2) (H-H), two hydrogen atoms are bonded together through a covalent bond. Hence it is a molecule.

In CO_(2) (O=C=O), one carbon atom and two oxygen atoms are bonded together through double bond. Hence it is molecule

InH_(2)O (H-O-H), one oxygen atoms and two hydrogen atoms are bonded together through single bond. Hence it is a molecule.

In NaCl, Na^(+) and Cl^(-) ions are held together through ionic attraction forces. Here no actual bond exists between Na^(+) and Cl^(-). Both Na^(+) and Cl^(-) remain present as individual ions.

Hence NaCl does not contain molecules
Answer 2
Answer: B, molecules are ionic bonding this is covalent 

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Which base is the strongest for the given [H+]? 10-9 10-11 10-10 10-12

Answers

Answer:The strongest base with H^+] concentration is [H^+]=10^(-12) M.

Explanation:

pH=-\log[H^+]

Higher the pH value less will be the concentration of [H^+] ion concentration and stronger will be the base.

1. [H^+]=10^(-9) M

pH=-\log[10^(-9)]=9

2.[H^+]=10^(-11) M

pH=-\log[10^(-11)]=11

3.[H^+]=10^(-10) M

pH=-\log[10^(-10)]=10

4.[H^+]=10^(-12) M

pH=-\log[10^(-12)]=12

The strongest base with H^+concentration is [H^+]=10^(-12) M.
The answer is 10-12. The relationship of pH and [H+] is pH = -lg[H+]. And the higher pH, the stronger base is. So the strongest base has the lowest concentration of H+.

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