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FromTheMoon [43]
3 years ago
13

Which of the following human activities impact air quality?

Chemistry
2 answers:
Angelina_Jolie [31]3 years ago
8 0

Answer:

flying a jet airplane.

tigry1 [53]3 years ago
4 0

Answer:

planting a tree

Explanation:

Human activities can impact air quality in many different ways. Some activities harm air quality and some activities improve it.

Planting a tree is one way to positively affect air quality. Trees improve air quality via photosynthesis and can filter some pollutants out of the air.

Activities that can harm air quality include clear cutting a forest, flying a jet airplane, and driving a car. Damaging forests decreases their ability to improve air quality. Flying jet airplanes and driving cars releases pollutants into the air.

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What is the limiting reactant in the following equation? How much Fe2O3 will be produced if 2.1 g of Fe reacts with 2.1 g of O2?
Nuetrik [128]

Answer:

Fe is limiting reactant and 3.00g of Fe2O3 will be produced

Explanation:

To solve this question we must convert the mass of each reactant to moles and, using the reaction we can find limiting reactant. With moles of limiting reactant we can find moles of Fe2O3 and its mass as follows:

<em>Moles Fe -Molar mass: 55.845g/mol-</em>

2.1g * (1mol / 55.845g) = 0.0376 moles

<em>Moles O2 -Molar mass: 32g/mol-</em>

2.1g * (1mol / 32g) = 0.0656 moles

For a complete reaction of 0.0656 moles of O2 are needed:

0.0656moles O2 * (4mol Fe / 3 mol O2) = 0.0875 moles Fe

As there are just 0.0376 moles,

Fe is limiting reactant

The mass of Fe2O3 is:

<em>Moles:</em>

0.0376 moles Fe* (2mol Fe2O3 / 4mol Fe) = 0.0188 moles Fe2O3

<em>Mass:</em>

0.0188 moles Fe2O3 * (159.69g / mol) =

3.00g of Fe2O3 will be produced

4 0
3 years ago
Help me please I really need help on this?
vovangra [49]

Explanation:

first one d

second cant see clear

3 0
3 years ago
4. The following occurs when heat energy is removed: Gas --A-&gt; Liquid-B--&gt; Solid.
Misha Larkins [42]

Answer: The phase change for A and B respectively is condensation, freezing.

Explanation:

A process in which gaseous state of a substance converts into liquid state is called condensation.

For example, conversion of steam into water.

A process in which liquid state of a substance converts into solid state is called freezing.

For example, conversion of liquid water into ice.

Thus, we can conclude that the phase change for A and B respectively is condensation and freezing.

6 0
3 years ago
In which of the following is number of electrons the ion contains given correctly? A. H+ has 1 electron. B. Br- has 34 electrons
Leviafan [203]
The correct answer would be D. Ca^2+ has 18 electrons. This is because 2+ means that 2 electrons have been removed, and Ca starts out with 20 electrons. As 20 - 2 = 18 electrons, D is the correct answer.

Hope this helps!
8 0
3 years ago
Read 2 more answers
Which of the following molecules can be used in catabolic reactions to generate the carbon backbones required for gluconeogenesi
sleet_krkn [62]

Answer:

The correct option is A

Explanation:

Some amino acids, called glucogenic amino acids, when catabolized convert there carbon backbones to tricarboxylic acid (TCA) cycle intermediates. These intermediates can be subsequently metabolized into carbon dioxide and water with the release of ATP or the formation of glucose (known as gluconeogenesis.

<u>All amino acids (with the exception of leucine and lysine) are glucogenic and can thus generate the carbon backbones required for gluconeogenesis</u>. Thus, the correct option is a.

3 0
3 years ago
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