3 years ago

Which phrase describes a valence electron?(1 point)an electron in the innermost orbit of an atom

Chemistry

1 answer:

devlian [24]3 years ago

3 0

Answer:

an electron in the outer energy level of an atom

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Calculate the mass percent (m/m) of a solution prepared by dissolving 51.56 g of NaCl in 164.2 g of H2O. Express your answer to

denis-greek [22]

Answer:

"23.896%" is the right answer.

Explanation:

The given values are:

Mass of NaCl,

= 51.56 g

Mass of H₂O,

= 165.6 g

As we know,

⇒ Mass of solution = $Mass \ of \ (NaCl+H_2O)$

= $51.56+164.2$

= $215.76 \ g$

hence,

⇒ $Mass \ percent =\frac{Mass \ of \ NaCl}{Mass \ of \ solution}\times 100$

$=\frac{51.56}{215.76}\times 100$

$=23.896 \ percent$

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3 years ago

According to boyle’s law, when the pressure on a gas in an enclosed container increases, the volume of that gas

Doss [256]

Decreases. Hope I helped

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A strong acid can also be described as a very weak .

faltersainse [42]

I guess is weak alkaline. when the substance is more acidic, there will be less alkalinity

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3 years ago

Some plz help me make mnemonic to helpme remember the oder of the planets

Iteru [2.4K]

Answer:

My - Mercury

Very- Venus

Excited- Earth

Mother- Mars

Just- Jupiter

Served- Saturn

Us- Uranus

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Explanation:

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Cyclopropene decomposes to propene when heated to 500 C, calculate rate constant for the first order reaction 0 min 1.48 mmol/L

Dmitry_Shevchenko [17]

Answer:

k = 0.0306 min-1

Explanation:

The table is given as;

Time, Concentration

0 1.48

5 1.27

10 0.98

15 0.84

The integrated rate law for a first order reaction is given as;

ln [A] = -kt + ln [Ao]

where;

[A] = Final Concentration

[Ao] = Initial Concentration

k = rate constant

t = time

In the table, taking the first two sets of values;

t = 5

k = ?

[Ao] = 1.48

[A] = 1.27

Inserting into the equation;

ln(1.27) = - k (5) + ln(1.48)

ln(1.27) - ln(1.48) = -5k

-0.1530 = -5k

k = -0.1530 / -5

k = 0.0306 min-1

6 0

3 years ago