CHEMISTRY HIGH SCHOOL

Which hydrocarbons are present in styrene?a) alkene
b) alkyne
c) none of the above?

Answers

Answer 1
Answer: Option a: alkene

Styren is C6H5CH=CH2, i.e. ethenylbenzene 

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Disorder in the universe increases because A. spontaneous changes produce more order in a system.
B. work produces disorder in a system.
C. work produces waste heat, which leaves a system.
D. all of the above

Answers

The correct answer would be the letter C.
A is obviously not right since it says "more order". B is incorrect because work is obligatory to make an order. If A and B are wrong, then D must be wrong. You're left with C, which is the only true statement here.

Explanation:In thermodynamics, a parameter representing the state of disorder of a system at the atomic, ionic, or molecular level; the larger the disorder the upper the entropy. A live of disorder within the universe or of the inconvenience of the energy during a system to try to work.
The correct answer would be letter C. A is obviously not right, since it says "more order". B is incorrect because work is obligatory to make order. If A and B are wrong, then D must be wrong. You're left with C, which is the only true statement here.

Explain how tectonic plate movement could create another supercontinent like pangaea(and one thing on picka subject were is science )

Answers


The plates are moving and are for billions of years... they collide and that they rip apart. The plates carry the continents on their "backs"; if 2 plates -each with a continent- collide, then a supercontinent is created. The landmass of Asian nation accustomed be an isolated block concerning 30-50 million years ago; it 1st crashed into Asia to form the range of mountains. If the movement of the plates brought all the continents along once more, one continent would type. At the instant plate, movements aren't heading in this direction.
in millions of years, people say that, since there are two plates away from each other moving, will one day meet in the middle, creating one large land mass.

One group of scientists has proposed a new theory on Adaptation. A majority of scientists worldwide agree with the theory. The theory is most likelyA.biased.
B.incomplete.
C.accurate.
D.unchangeable.

Answers

The theory is most likely accurate and the main reason behind this process of thinking is because a majority of the scientists around the world agree with the theory. It can never be biased or incomplete. The correct option among all the options that are given in the question is the third option or option "C".

Answer: The correct answer is-

C.accurate.

As per the information in the question, a group of scientists has proposed a new theory on Adaptation, which is accepted by majority of scientists worldwide. This indicates that the proposed theory is most likely to be accurate.

A scientific theory is an explanation of certain aspects of nature that is based on some facts as well as evidences. It is tested, observed, and proven right on the basis of repeated experimentation.

As the theory on Adaptation is accepted by majority of the scientists, it means that it is most likely to be accurate.

Thus, option C) is the right answer.

What is the mass, in grams, of 6.82 L of nitrogen monoxide at STP? R = 0.0821 L atm / mol K

Answers

Answer: 9.13g NO

Explanation:

First, I list what I know, which is the values of STP, the volume, the constant R, and the molar mass of NO; I also include what I'm looking for, which is n, the number of moles of NO.

STP = 273.15K, 1 atm

P = 1 atm

V = 6.82L

R = 0.0821 L*atm/mol*K

T = 273.15K

n = ?

NO mass: 30.01 g/mol

Then, I use the ideal gas law, PV = nRT, to find the number of moles of NO:

(1 atm)(6.82 L) = n((0.0821 L*atm)/(mol*K))(273.15K)
(1 atm)(6.82 L) = n((22.43 L*atm)/(mol))
(1 atm)(6.82 L) / ((22.43 L*atm)/(mol)) = n       => divided both sides by 22.4L*atm/mol
n = 0.304 mol NO

Then, I use the molar mass of NO, 30.01 g/mol, to convert from mol NO to g NO:

g NO = 0.304 mol NO((30.01g NO)/(mol NO))
         = 9.13 g NO

I hope this helps! :)

If a neutral atom has a mass of 12 amu and an atomic number of 5, determine the number of protons, neutrons, and electrons in the atom.

Answers

Answer:

Number of neutrons = 7

The number of protons = The number of electrons = 5

Explanation:

Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.

However, when we talk about the atomic number of the ion, it is not equal to the number of electrons as electron can be gained or loosed.

This is why, more appropriately, the number of the protons which are present in the nucleus of the atom is called the atomic number.

Thus, atomic number = 5

Since, it is a neutral atom, The number of protons = The number of electrons = 5

Mass number is the number of the entities present in the nucleus which is the equal to the sum of the number of protons and electrons.

Mass number = Number of protons + Number of neutrons

12 =  5 + Number of neutrons

Number of neutrons = 7
Mass number = total protons + neutrons, and proton number = total protons (and therefore electrons, if not an ion.) Therefore: Neutrons = 12 - 5 = 7 Protons = 5 Electrons = 5

Particles are arranged in a crystal structure in a sample of:a) H2 (g)
b) Br2 (L)
c) Ar (g)
d) Ag (s)

Answers

The answer is number 4. Ag(s) or Solid Silver. Silver in a solid phase has a face centered cubic crystal structure. Among your choices, silver is the only example of particles that are arranged in their crystal structure while the other choices are gases and liquid. Liquid and gases have loose atoms that do not form crystal structures. 
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