CHEMISTRY HIGH SCHOOL

Suggest two reasons why the UK government wants to encourage recycling of iron and steel......

Answers

Answer 1
Answer: The two reasons why the UK government is encouraging citizens to recycle iron and steel is:
1.   The environment. Every machinery and device the industries makes which includes, infrastructures, mega structures to micro devices. Iron and steel is used. Reducing the extraction of ore and creating steel saves the environment, reduces mining.
2.   Economic reasons. When the ore mining and steel making is reduced in activity, the government won’t just be able to save the environment but it also save funds for other purposes.



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The light intensity of a source is 100 candelas. The illuminance on a surface is 4 lux. How far is the surface from the source?

Answers

The answer is 5 meters.

The illuminance on a surface (E) is equal to the light intensity (I) divided by the square distance from the light source (d):
E = I ÷ d² [=] candela/ square meters = lux.
The unit of the illuminance is lux.

So, it is given:
E = 4 lux
I = 100 candelas
d = ?

If:
E = I ÷ d²
Then
d² = I ÷ E
⇒ d² = 100 ÷ 4
⇒ d² = 25

If we put both sides of the equation under the square root, then:
√d² = √25
⇒ d = 5 meters.

Therefore, the surface is 5 meters far from the light source.

Molecules in all organisms are composed in part of radioactive carbon-14. Which statement best explains the presence of carbon-14 in organisms?a. The radioactive isotope reacts in the same way as stable isotopes in the nuclear reactions in the body.
b. The radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body.
c. The radioactive isotope reacts faster than stable isotopes in the nuclear reactions in the body.
d. The radioactive isotope reacts faster than stable isotopes in the chemical reactions in the body.

Answers

I think the correct answer from the choices listed above would be option B. The statement that best describes the presence of carbon-14 in organisms would be that radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body. This seems to be the most suitable answer since the other choices suggest that there are nuclear reactions in our system which is very far from the truth.

The statement that best explains the presence of carbon-14 in organisms is that the radioactive isotope reacts in the same way as stable isotopes in the chemicalreactions in the body. That is option B.

What is radioactive carbon-14?

Radioactive carbon-14 is a type of radioactive element that is present in the air which is assimilated in small quantities into the body during metabolism( chemical reaction of the body).

The radioactive carbon-14. can be used in a process called carbon dating because it reacts the same way as stable isotopes in their chemical reactions in the body.

Learn more about radioisotopes here:

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Which statement describes a property of covalent compounds? They have a high boiling point because of strong intermolecular forces. They have a low boiling point because of weak intermolecular forces. They have a low melting point because of strong intermolecular forces. They have a high melting point because of weak intermolecular forces.

Answers

Answer: Option (b) is the correct answer.

Explanation:

A compound in which atoms share electrons with each other are known as covalent compounds.

Since there are no strong intermolecular force of attraction between the atoms hence, there bond can be easily broken down.

Thus, we can conclude that out of the given options, the statement they have a low boiling point because of weak intermolecular forces.

The correct answer is:

They have a low boiling point because of weak intermolecular forces.

Which description explains the role of activation energy in a chemical reaction? A .It provides useful energy that is released in an exothermic reaction.
B. It stops the products from being formed from the intermediate state.
C. It slows down the overall chemical reaction so it does not happen too quickly.
D. It provides reactants with sufficient energy for bonds to break and reform.

Answers

Answer: The description it provides reactants with sufficient energy for bonds to break and reform best explains the role of activation energy in a chemical reaction.

Explanation:

Activation energy is defined as the minimum amount of required energy so that a chemical reaction can initiate.

As a result, it provides the reactants with certain amount of energy so that they will get the necessary amount of energy to break their bond and then  form new bonds.

Thus, we can conclude that the description it provides reactants with sufficient energy for bonds to break and reform best explains the role of activation energy in a chemical reaction.
D. Activation energy is the energy that is required in order for a reaction to occur, i.e. break and form new bonds

You find that the unknown powder contains the illegal drug cocaine. If someone where to ask you to determine the purity of the substance, what would they mean? Why is purity important in crime investigations?

Answers

The substance is not composed entirely of cocaine, it is mixed with other materials. The purity refers to what percentage of the powder is cocaine, and what percentage is other materials.
Purity can be important in crime investigations to find out the samples value, and to pair it with previously found samples of equal purity to deduce that they came from the same source.

Answer:

If some would ask me to determine the purity of an unknown powder that contains illegal drugs like cocaine, they would probably be wanting to remove other substances that are added like baking soda, and the reason this is so important is that sometimes the ingredients they get to mix with have an effect on the test and may miss lid the results.

Explanation:

Is NH3 a molecular crystal, metal, ionic crystal, or a network solid?

Answers

Hi! NH3 is ammonia and it is a gas. It is a polar molecular solid and it can exhibit hydrogen bonding.


Answer:

Molecular Crystal

Explanation:

Hope this helps!
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