CHEMISTRY MIDDLE SCHOOL

.An alkane reacts with a halogen to form a halocarbon. What is the role of UV light in this reaction?


It provides energy for the reaction.

It is released by the reaction.

It catalyzes the reaction.

PLEASE EXPLAIN YOUR ANSWER

Answers

Answer 1
Answer:

Answer:

  • First choice: it provides energy for the reaction.

Explanation:

Alkanes are relative stable molecules: saturated chains of carbon and hydrogen atoms, where each carbon atom is hydridized sp³ and is bonded to one or two carbon atoms and 2 or 3 hydrogen atoms.

The C-H bonds are slightly polar (carbon is more electronegative than oxygen).

On the other hand, the diatomic halogen molecule (F₂, Cl₂, Br₂, or I₂) is a non-polar molecule.

The mechanism of reaction between the alkane and the halogen is via free radicals: the halogen molecule must be splitted into two radicals (two atoms each with a free electron). This implies the rupture of the diatomic halogen, and this requires an important amount of energy. The role of the UV ligth is to provide the energy to split the halogen molecule and, in this way, start the reaction.

Then, the free halogen radical may react with the alkane molecule breaking a C - H bond and substituting the leaving hydrogen atom, forming a C - X bond (X represents the halogen atom).

As a demonstration of this role, you may find in the specialized textbooks this typical reaction:

  • CH₄ + Cl₂ + energy → CH₃Cl + HCl

The  energy shown in the reactant side may be supplied as UV light or heat. So, the role of UV light is to provide energy to start the reaction.
Answer 2
Answer:

Answer:

It provides energy for the reaction.

Explanation: gradpoint

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6. What is SEAgel?a lightweight foam insulation
a skin conditioner made from seaweed
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Answers

The answer that you are looking for would be a

Answer:

a lightweight foam insulation

Explanation:

How many milliliters of a 2.00 M KBr are needed to prepare 250.0 mL of 0.60 M KBr?

Answers

Answer:

75mL

Explanation:

Data obtained from the question include:

C1 = 2M

V1 =?

C2 = 0.60M

V2 = 250mL

The original volume of solution can be obtained as follows:

C1V1 = C2V2

2 x V1 = 0.6 x 250

Divide both side by 2

V1 = (0.6 x 250) / 2

V1 = 75mL

The volume needed is 75mL

an, 13 Students set up two environments see which one best supports growth of hibiscus flowers. One environment is created as a desert, using The plant is exposed to high temperatures. The a tropical other environment is create exposing the forest, using soil and the plant to high temperatures. What is variable used in the investigation? 5.2(A) CA The temperature The environmen The type of flower The amount of sunlight in D

Answers

B. The Enviroment. The Soil and Humidity are differant. They both have high tematures, they use the same flowers in both, Hibiscus. The tropical environent should help the Hiviscus grow better.

Why is it important to ensure that treated water remains safe to drink when it is stored after treatment? what is one way to make stored water safe?

Answers

It is important to ensure that treated water remains safe to drink when it is stored after treatment because of the following reasons:

  • to prevent from germs.
  • to prevent ourselves from various diseases.
  • to protect our health.

The one way to make stored water safe is that stored it in clean container.

Why it is important to drink safe water and how to make stored water safe ?

It is important to ensure that the treated water remains safe to drink when it is stored after the treatment because

  • To prevent us from germs and other containments: Drinking water contains germs, viruses, bacteria which can lead a serious health problems, diseases suchas cholera.
  • To prevent ourselves from various diseases: When we stored waterafter treatment it improves the taste of water, smell of water and its appearance also.  
  • To protect our health: Untreated water is not good for drinking for our health because it contains many impurities and they are harmful for our health.    

The one way to make stored water safe is that stored it in clean container and do not store the containers of water in direct sunlight.          

Thus, we can say that it is important to ensure that treated water remains safe to drink when it is stored after treatment due to prevent us from diseases, germs, viruses and othercontainments. After treatment of water it is must be tested once to that it is stored to ensure that it is safe for drinking or not.

Learn more about the importance of clean water here: brainly.com/question/25945773

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80cm^3 of oxygen gas diffused through a porous hole in 50 seconds how long wiil it take 120cm^3 of nitrogen (iv) oxide to diffuse through the same hole at the same conditions ?​

Answers

Answer: it will take 89.93secs

Explanation:Please see attachment for explanation

How does the absorption and release of energy affect temperature change during a chemical reaction?

Answers

It depends. If you are talking about the temperature of the chemicals in the reaction, than the temperature increases due to increasing enthalpy. However, if you are talking about the temperature of the surrounding, than the temperature of the surrounding would actually decrease since heat is being taken away from the environment into the reaction.
if heat is absorbed, the temperature increases but if heat is released, the temperature decreases :))
i hope this be helpful
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