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3 years ago

Covalently bonded compounds differ from ionically bonded compounds because:

1 answer:

3 0

Answer:Covalently bonded materials are less dense than metallic or ionically bonded ones because covalent bonds are directional in nature whereas metallic and ionic are not; when bonds are directional, the atoms cannot pack together in a dense manner, yielding a lower mass density then solids with non-directional bonds.

Explanation:

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If the energy difference between two electronic states is 214.68 kJ / mol , calculate the frequency of light emitted when an ele

atroni [7]

${\qquad\qquad\huge\underline{{\sf Answer}}}$

Here we go ~

Energy difference btween the two electronic states can be expressed as :

${ \qquad \sf \dashrightarrow \: \Delta E = h\nu}$

[ h = planks constant, ${\: \nu }$ = frequency ]

$\qquad \sf \dashrightarrow \:214.68 = 39.79 \times 10 {}^{ - 14} \times \nu$

$\qquad \sf \dashrightarrow \: \nu = \cfrac{214.68}{39.79 \times 10 {}^{ - 4} }$

$\qquad \sf \dashrightarrow \: \nu = \cfrac{214.68}{39.79 } \times 10 {}^{14}$

$\qquad \sf \dashrightarrow \: \nu \approx 5.395 \times10 {}^{14} \:\:hertz$

5 0

2 years ago

What are three factors that control deep currents?

Lyrx [107]

Global winds, coriolis effect and <span>continental deflections. Hope this helps!</span>

8 0

4 years ago

The combustion of methane(CH4) produces carbon dioxide and water. Assume that 2.0 mol of CH4 burned in the presence of excess ai

harkovskaia [24]

Answer:

The answer to your question is 98.9 %

Explanation:

Data

moles of methane = CH₄ = 2.0

excess air

Percent yield = ?

mass of CO₂ = 87 g

- Balanced chemical reaction

CH₄ + 2O₂ ⇒ CO₂ + 2H₂O

Reactants Elements Products

1 C 1

4 H 2

4 O 2

- Calculate the molar mass of CH₄

CH₄ = 12 + 4 = 16 g

- Convert the moles to mass

16 g of CH₄ ----------------- 1 mol

x ----------------- 2 moles

x = (2 x 16) / 1

x = 32 g of CH₄

-Calculate the theoretical formation of CO₂

16 g of CH₄ ----------------- 44 g of CO₂

32 g of CH₄ ---------------- x

x = (32 x 44) / 16

x = 88 g of CO₂

-Calculate the Percent yield

Percent yield = Actual yield/Theoretical yield x 100

Percent yield = 87/88 x 100

Percent yield = 98.9 %

3 0

3 years ago

What is the mass of sodium (Na) in 50 grams of table salt (NaCl)? Show your work.

beks73 [17]

Answer:

The amount of sodium in this sample = 32.4 grams

Explanation:

Mass of Sodium = 23 g/mol

Mass of Chlorine = 35.5 g/mol

Mass of NaCl = 35.5 g/mol

Fraction of Na in NaCl = $\frac{23}{35.5}$

=0.648

We are given a sample of 50 grams of sodium chloride.

The amount of sodium in this sample = $Amount of sodium in 1 gram sample \times weight of sample$

The amount of sodium in this sample = $0.648 \times 50$

The amount of sodium in this sample = 32.4 grams

4 0

4 years ago

Which of the following correctly describes a trend in atomic structure as you go down the elements in one group of the periodic

Wewaii [24]

A is the correct answer

groups are the vertical columns on the table. if you look at it, you can see that the atomic number and atomic mass increases as you go down.

6 0

4 years ago