What are chemical reactions?

Answers

Answer 1

Answer: 2 elements or more sharing/gaining/losing to each other for a result of full outer shells of electrons of each element to become noble gases.

Answer 2

Answer: chemical reactions are reactions that make chemical changes to a type of something. sometimes its physically seen as well.
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Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide. Which statement best describes these three components of air? A)They are all classified as pure substances.

B)They cannot react with another substance.

C)They are chemically bonded to one another.

D)They can be classified as elements.

Answers

I think the correct answer from the choices listed above is option A. The three components of air are all classified as pure substances since they are not chemically bonded so they can be separated by certain processes and be present as a pure substance. Hope this answers the question.

The statement that best describes the three component of air is they are all classified as pure substances.

What are pure substances?

Pure substances are those substances which are made up of only one material and has specific and fixed structure. They are also called as elements.

Thus, the correct option is A) They are all classified as pure substances.

Learn more about pure substances

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.During the combustion of methane (CH4), one mole of methane gas combines with two moles of oxygen gas (O2) to produce one mole of carbon dioxide gas (CO2) and two moles of water vapor. Which of the following chemical equations correctly represents the combustion of methane described above?

Answers

Answer:

22.4 L methane reacts with 44.8L of oxygen to give 44.8L of CO

2 and 22.4 L of water

Explanation:

From the balanced reaction: One mole(or 1 molecule or 16 g) of CH

reacts with 2 moles (or 2 molecules or 64 g) of oxygen to give one mole (or 1 molecule or 44 g) of CO

and 2 mole (or 2 molecules or 36 g) of water.

For the gaseous system at STP:

22.4 L methane reacts with 44.8 L of oxygen to give 22.4 L of CO

and 44.8 L of water.

and 2 mole (or 2 molecules or 36 g) of water.

For the gaseous system at STP:

22.4 L methane reacts with 44.8 L of oxygen to give 22.4 L of CO

and 44.8 L of water.

The element carbon is present in all organic compounds. Which reason would explain why there are so many different types of organic compounds? A) Carbon is a nonmetal. B) Carbon has an atomic number of six. C) Carbon can form four covalent bonds. D) Carbon has a total of six electrons.

Answers

The answer is d. Since, carbon can form four covalent bonds it can react with other elements to create other organic compounds. The atomic number doesn't prove anything about organic compounds. The atomic number only says what is the charge of the element.

B) Carbon has anatomicnumber of 6
hope it helps
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Why rusting takes place more readily in coastal areas

Answers

Corrosion is a better word to use as Iron is the metal that 'rusts' and it happens more in coastal areas because coasts are humid. Humidity reacts with the metal causing it to corrode and wakening it

When May a hypothesis be revised

Answers

Answer: Based on experimental data

Explanation: The hypothesis is not the ultimate proven theory, the more a preliminary assumption on the basis of which further research is carried out with the help of experiments in order to prove the hypothesis as accurate. If the experiments carried out showed that the hypothesis is wrong, it is necessary to revise the hypothesis and set up a new experiment.

a hypothesis may be revised after the experiment that you performed proved it wrong. then after looking over the data you should revise your hypothesis and perform the experiment again.

Which bond is most polar? A) N -H
B) C -H
C) O -H
D) H -H
Can anyone explain this one?

Answers

A) N is more polar because of it electron negativity charge ex. N electron negativity charge is 3.0 and H is 2.1
B) C is more polar...electron negativity for C is 2.5 AND H is 2.1
C)O is more polar dues to it electron negativity charge being greater that hydrogen
D)H and H are both non polar because they cancel each other out due to the face the both share the electron negativity evenly

C .. ectronegativity values for each of the atoms but if you didn't know these you can just look at your periodic table and see where they are in relation to each other

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