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3 years ago

Chemical properties of sodium

Chemistry

1 answer:

Svetlanka [38]3 years ago

5 0

Answer:

Density 0.97 g.cm -3 at 20 °C

Melting point 97.5 °C

Boiling point 883 °C

oxidation states +1, −1 (rare)

Explanation:

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There are eight primary amines with the molecular formula C5H13N.

emmainna [20.7K]

Answer:

1-Pentanamine

2-Pentanamine

3-Pentanamine

3-methyl-2-butanamine

3-methyl-1-butanamine

2-methyl-1-butanamine

2-methyl-2-butanamine

2,2-dimethyl-1-propanamine

2-pentanamine

3-methyl-2-butanamine

2-methyl-1-butanamine

Explanation:

Amines are organic compounds derived from ammonia by replacing the hydrogen atoms, one at a time with carbon-containing groups. The functional groups are R-NH₂, R₂-NH, and R₃-N

Amines are classified into primary, secondary, or tertiary according to the number of substituted hydrogen.

From the given question.

A compound with the molecular formula C₅H₁₃N was given;

The possible eight structural formula of the compound and those that exhibit chirality can be seen in the attached image below.

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4 years ago

An analytical chemist is titrating 242.5 mL of a 1.200 M solution of hydrazoic acid HN3 with a 0.3400 M solution of NaOH. The pK

rodikova [14]

Answer:

The pH of the solution is 12.61

Explanation:

Step 1: Data given

Molarity of hydrazoic acid solution = 1.200 M

Volume of solution = 242.5 mL

Molarity of NaOH solution = 0.3400 M

pKa = 4.72

Step 2: The balanced equation

HN3 + NaOH → NaN3 + H2O

Step 3: Calculate moles hydrazoic acid

Moles hydrazoic acid = molarity * volume

Moles hydra

zoic acid = 1.200 M * 0.2425 L

Moles hydrazoic acid = 0.291 moles

Step 4: Calculate moles NaOH

Moles NaOH = 0.3400 M * 1.006 L

Moles NaOH = 0.342 moles

Step 5: Calculate the limiting reactant

HN3 is the limiting reactant. It will completely be consumed (0.291 moles)

NaOH is in excess. There reacts 0.29 moles. There will remain 0.342 - 0.291 = 0.051 moles NaOH

Step 6: Calculate total volume

Total volume = 242.5 mL + 1006 mL = 1248.5 mL = 1.2485 L

Step 7: Calculate molarity of NaOH

Molarity NaOH = 0.051 moles / 1.2485 L

Molarity NaOH = 0.0408 M

Step 8: Calculate pOH

pOH = -log [OH-] = -log(0.0408)

pOH = 1.39

Step 9: Calculate pH

pH = 14 - pOH

pH = 14 - 1.39

pH = 12.61

The pH of the solution is 12.61

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3 years ago

what discovery led to the abandonment of the atomic mass as the determining factor for organizing elements in the periodic table

Ostrovityanka [42]

Answer:

A. isotopes

Explanation:

The periodic table was organized by Dimitry Mendeleiev by 1869, as he showed the connection between the atomic mass and the properties of the elements.

Nevertheless, the order of some few elements had to be altered because the properties did not follow the order of the atomic masses.

Henry Mosely by 1913 determined that atoms of a same element had different number of neutrons, leading to different atomic masses. These atoms of a same element (with the same number of protons) with different number of neutrons are known as isotopes.

By arranging the elements in increasing order of the number or protons (atomic number), instead of the atomic masses, all the elements resulted ordered according with a repetitive (periodic) pattern of chemical properties.

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3 years ago

The temperature at which a solid melts is the same as the temperature at which its liquid form solidifies (true or false)

Vanyuwa [196]

its false not true................

4 0

3 years ago

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A solid element that is malleable, a good conductor of electricity, and reacts with oxygen is classified as a(1) metal(2) metall

sukhopar [10]

Metalloid is the closest because noble gases are obviously out, nonmetals are terrible conductors, and metals are not malleable

6 0

3 years ago

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