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3 years ago

When a covalent or an ionic bond is formed a chemical change has

Chemistry

2 answers:

Vikki [24]3 years ago

8 0

The chemical properties of the substances produced by the reaction are different from those of the reacting substances.

Anni [7]3 years ago

3 0

there is a chemical reaction because the ionic bond means that the ions are sharing electrons in a covalent bond there has been 2 non metals (or more) sharing pairs of electrons.

It has formed something new unlike a physical change.

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What is the pressure in a 5.00 L tank with 49.00 grams of oxygen gas at 350 K? ___atm

ziro4ka [17]

Answer:

The right answer is "8.81 atm".

Explanation:

Given:

V = 5.00 L

Mass = 4900 g

MW = 32 g/mol

T = 350 K

Now,

Number of moles will be:

$n = \frac{Mass}{MW}$

$=\frac{49.00}{32}$

$=1.53125 \ mole$

By using the ideal gas equation, we get

⇒ $PV=nRT$

or,

⇒ $P=\frac{nRT}{V}$

By substituting the values, we get

$=\frac{1.53125\times 0.0821\times 350}{5.00}$

$=\frac{44.1}{5.00}$

$=8.81 \ atm$

4 0

3 years ago

Does the volume of a ballon change in the freezer

mafiozo [28]

Yes cause it is colder

6 0

3 years ago

Nitrogen dioxide, a major air pollutant, can be produced by the combustion of nitrogen oxide as shown. 2NO O2 Right arrow. 2NO2

Gnesinka [82]

Nitrogen dioxide is one of the primary components of air pollution. It is released by the combustion of nitrogen oxide.

<h3 /><h3>How do you calculate the percentage yield of nitrogen oxide?</h3>

Given:

Mass of nitrogen oxide consumed = 1500 kg
Mass of nitrogen oxide produced = 1500 kg

The given chemical equation of nitrogen oxide is:

$\rm 2 NO + O_2 \rightarrow 2 NO_2$

Now, to calculate the percentage yield, the following conversion factor should be used:

$\rm 1500\; kg \;NO \times \dfrac{1000 \;g\; NO}{1\; kg \;NO}\times\dfrac {1 \;mol \;NO}{30\; g \;NO}\times\dfrac {2 \;mol \;NO_2}{2 \;mol \;NO}\times\dfrac {46 \;g \;NO_2}{1 \;mol \;NO_2}\times\dfrac {1 \;kg}{1000 \;g}$

Nitrogen dioxide = 2300 kg

The percentage yield will be:

$\rm Percentage Yield = \dfrac{Actual \; Yield}{Expected \;Yield}\times 100\\\\\\
\rm Percentage Yield = \dfrac{2500\;kg}{2300\;kg}\times 100\\$

Percentage yield = 65.2 %

Thus, the percentage yield of nitrogen dioxide is 65.2%.

Learn more about <u>percentage yield </u>here:

brainly.com/question/9352001

8 0

3 years ago

_____ stars can be between one thousand times dimmer and one million times brighter than the Sun.

dmitriy555 [2]

Answer:

The answer is

D. Main sequence

Explanation:

Main sequence stars can be between one thousand times dimmer and one million times brighter than the Sun.

What is main sequence stars?

A main sequence star is any star that is fusing hydrogen in its core and has a stable balance of outward pressure from core nuclear fusion and gravitational forces pushing inward.

6 0

4 years ago

Please help me I need these answers

lianna [129]

Question 4: C
question 5: D

8 0

3 years ago