CHEMISTRY HIGH SCHOOL

How many electrons are there in the 2nd principal energy level (n?

Answers

Answer 1
Answer: Each principal energy level above the first contains one s orbital and three p orbitals. A set of three p orbitals, called the p sub level, can hold a maximum of six electrons. Therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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Which atomic model was proposed as a result of J. J. Thomson’s work?

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J.J. Thomson discovered the electron by experimenting with a Crookes, or cathode ray, tube. He demonstrated that cathode rays were negatively charged. He then proposed the Plum Pudding Model.
The atomic model was proposed as a result of J. J. Thomson’s work was the plum pudding model.

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Producers are generally found at the beginning of a food chain. Whichstatement best explains why this is true? *
1. Producers are usually smaller in size than consumers.
2. Producers do not rely on other organisms for food.
3. There are always more consumers than producers in food chains.

Answers

Explanation:

Second answer is the correct one.

What is the approximate mass of one mole of oxygen gas (O2)?a. 8 g
b. 16 g
c. 32 g
d. 1.204 × 1024

Answers

The correct answer is B.

1 mol O2  x  15.999 O2/ 1 mol O2 = 15.999 O2

16 O2 when rounded.

A _____ is a new substance formed in a chemical reaction.A. coefficient

 

B. product

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B. product
Think about it like this: a company produces products, not coefficients.

As the number of effective collisions between reacting particles increases the rate of reaction

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the rate of reaction increases 

Which of the following is true about the structure of an atom?A. Electrons, neutrons, and protons are made up of even smaller constituents, such as quarks and gluons.

B. An atom is not composed of smaller parts and cannot be broken down into smaller constituents.

C. Atoms are composed of tiny cells that make up all forms of matter.

Answers

The correct answer should be A. Atoms can be broken up into protons, neutrons, and electrons. Protons and neutrons can be broken up into even smaller particles but I am not sure if it has been proven that electrons can be broken up into smaller particles. I hope this helps. Let me know if anything is unclear.
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