A student tested a sample of carbon (C) by combining it with water. There was no reaction between the carbon and water. The student concluded that carbon must be a group 18 element, since it was unreactive. State whether you agree with the student's reasoning, and explain why or why not?

Answers

Answer 1
Answer: I disagree. Carbon is not a group 18 element. This is incorrect because elements closer to the top of the group are less reactive than those at the bottom of the group. Group 18 elements are noble gases and carbon, a group 14 element, is a non metal.

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Enter the molecular formula for butane, C4H10.
Express your answer as a chemical formula.

Answers

Butane is from the family of alkanes with –ane as its family name. The but- prefix stands for having four carbon atoms. The C4H10 is the general formula of butane and can also represent other forms or structures of butane. However if the question asks for the molecular formula of butane, think of how many electrons it can share to the hydrogen atom. The carbon atom can share 4 and hydrogen 1.  So if the three hydrogen atoms are attached to the first carbon, the other shared electron is attached to the second carbon. The second carbon atom can accommodate two hydrogen and 1 carbon. The third carbon can accommodate 2 hydrogen atoms and 1 carbon and the fourth carbon can accommodate 3 hydrogen atoms. The molecular formula is CH3-CH2-CH2-CH3.

Which of the following defines sublimation?Solid ➡ Gas

Solid ➡ Liquid

Liquid ➡ Solid

Gas ➡ Solid

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solid to gas
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Explain the connection between Earth's magnetic field and iron.

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The Earth's magnetic field is somewhat caused by the composition of the earth's core which is rich in iron minerals. There is a solid inner core that is made of iron which makes up to 2/3 of the moon's size. The charged metal of the iron produces electric currents, consequently resulting to Earth's magnetic field.

Answer:

The Earth's magnetic field is caused by how the earth's core is made. The earth's core is full of iron, especially in the inner core. That inner core is charged metal that produces electric currents that causes Earth's magnetic field. So because the core has iron, we have a magnetic field.

An unstable nucleus loses the most mass if the nucleus emits(1) an alpha particle (3) a positron
(2) a beta particle (4) a gamma ray

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1. an alpha particle

gamma rays are formally massless, positrons and electrons (beta particles) have negligible mass, but alpha particles have about 4 amu of mass

Stage in a star's evolution formed as the core of a main sequence star uses up its helium and the outer layers escape into space

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Answer:

The stars when they release their helium and get rid of their cape and throw it into space is because it is already the end of their life

Explanation:

During a portion of its life, a bright star due to the thermonuclear fusion of hydrogen in helium in its nucleus, which releases energy that crosses the interior of the star and then radiates into outer space. When the hydrogen in the nucleus of a star is almost depleted, almost all heavier elements than naturally produced helium are created by stellar nucleosynthesis during the life of the star and, in some stars, by nucleosynthesis of supernovae when explode At the end of its life, a star can also contain degenerate matter

Answer: the answer is white dwarf

Explanation:

An aqueous solution has a hydroxide-ion concentration of 1.0 x 10-3M. What is the pH of the solution? a 7
b -3
c 11
d 3

Answers

11 with pemdas, you have to multiply all by 3