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3 years ago

Use the words in the list to answer each question

Chemistry

1 answer:

UNO [17]3 years ago

5 0

<h2>a) atoms</h2><h2>b) molecules</h2><h2>c) elements</h2><h2>d) pure materials</h2><h2>e) particles</h2>

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Plants are responsible for a very important energy transformation, as shown. Which energy transformation dose the picture best i

galben [10]

Gibbons has yccucucucycdnccchkf

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4 years ago

Give the percent yield when 162.8 g of CO2 are formed from the reaction of excess amount of C8H18 and with 218.0 grams of O2. (2

katen-ka-za [31]

Percent yield is 23.11 % when 162.8 g of CO2 are formed from the reaction of excess amount of C8H18 and with 218.0 grams of O2.

Explanation:

Balanced equation for the chemical reaction:

2C8H18 + 25O2 → 16CO2 + 18H2O

data given:

CO2 formed (actual yield) = 162.8 grams

mass of oxygen = 218 grams

16 moles of CO2 formed when 5 moles of oxygen reacted

3.6 moles of CO2 formed when 6.8 moles of oxygen reacted.

In the reaction 16 moles of CO2 will have 44.01 x 16

theoretical yield of CO2 = 704.16 grams

percent yield = $\frac{actual yield}{theoritical yield}$ x100

putting the values in the above equation

percent yield = $\frac{162.8}{704.16}$ x 100

= 0.23 x 100

= 23.11 %

Percent yield is 23.11 %.

7 0

4 years ago

What is the density of an object with a mass of 145.8g and an volume of 91.75 mL?

Over [174]

Answer:

<h2>Density = 1.6 g/mL</h2>

Explanation:

Density of a substance can be found by using the formula

$Density = \frac{mass}{volume}$

From the question

mass = 145.8 g

volume = 91.75 mL

Substitute the values into the above formula and solve for the Density

That's

$Density = \frac{145.8}{91.75}$

= 1.5891

We have the final answer as

Density = 1.6 g/mL

Hope this helps you

4 0

3 years ago

Using Le Châtelier’s Principle, explain why people suffering from carbon monoxide poisoning are given pure oxygen to breathe in

Bas_tet [7]

Answer:

See explanation

Explanation:

Carbon monoxide is toxic because it can successfully competes with oxygen for hemoglobin (Hb) sites according to the following equilibrium:

Hb(O₂)₄(aq) + 4CO(g) ⇄ Hb(CO)₄(aq) + 4O₂(g)

Based on LeChatelier’s Principle, CO poisoning can be reversed by applying O₂(g) to victim. This addition of O₂(g) increases system concentration of O₂(g) in the equilibrium reaction thereby overloading the product side of the equilibrium forcing it to shift to the left, decomposing the carboxyhemoglobin (Hb(CO)₄) and releasing the CO(g) and combining with O₂(g) to form more Hb(O₂)₄.

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3 years ago

A type of covalent bond in which electrons are shared unevenly

MatroZZZ [7]

Polar bond.

A very common example is H2O.
The oxygen atom has an electronegativity value of about 3.5, while the hydrogen atoms have a value of about 2.2 (each).
Electronegativity describes how “greedy” atoms are with sharing electrons.
Since the oxygen atom has a greater value, it will be more “greedy” with the electrons.

8 0

3 years ago