6.11 Random Questions Units 1-5

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| By Harry Brielmann

Harry Brielmann

Community Contributor

Quizzes Created: 13 | Total Attempts: 5,136

Questions: 10 | Attempts: 140 | Updated: Aug 22, 2023

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Questions and Answers

1.

What is chemistry?
- A.
  
  The study of chemicals
- B.
  
  The study of matter and how it changes
- C.
  
  The art of mixing chemicals together and the determination of the products that form
- D.
  
  A measure of the compatibility between two people
Correct Answer
B. The study of matter and how it changes

Explanation
chemistry is the study of matter and how it changes.

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2.

What is a substance?
- A.
  
  A single chemical or a mixture of chemicals
- B.
  
  Two or more atoms bonded together
- C.
  
  Any small sample which has been chemically investigated
- D.
  
  A pure form of matter
Correct Answer
D. A pure form of matter

Explanation
A substance is a pure form of matter.
It many be a single element or atom (in which case there are no bonds), it cannot be a mixture.

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3.

Which observation is an example of a physical property?
- A.
  
  Dynamite explodes
- B.
  
  Meat rots if it is not refrigerated
- C.
  
  Gasoline burns
- D.
  
  Ice floats on top of liquid water
- E.
  
  A silver platter tarnishes
Correct Answer
D. Ice floats on top of liquid water

Explanation
all are forming new substances except the ice floating- no chemical change there.

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4.

How many significant figures are there in the following number? 40
- A.
  
  4
- B.
  
  3
- C.
  
  2
- D.
  
  1
Correct Answer
D. 1

Explanation
The zero here is also insignificant because it only tells how far away from the decimal point the 4 is. Had there been a decimal point, there would have been two significant figures.

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5.

Name the organic functional group in the substance below
- A.
  
  Alkene
- B.
  
  Alkyne
- C.
  
  Alcohol
- D.
  
  Ketone
- E.
  
  Ether
- F.
  
  Aldehyde
Correct Answer
D. Ketone

Explanation
a carbonyl group (C=O) with carbons on either side is a ketone

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6.

How many protons, neutrons, and electrons are in the following ion?
- A.
  
  Ten protons, eleven neutrons, twelve electrons
- B.
  
  Eleven protons, twelve neutrons, thirteen electrons
- C.
  
  12 protons, 11 neutrons, eleven electtons
- D.
  
  11 protons, 12 neutrons, ten electrons
- E.
  
  11 protons, 10 neutrons, 12 electrons
Correct Answer
D. 11 protons, 12 neutrons, ten electrons

Explanation
sodium always has eleven protons; 12 neutrons are needed since the mass number is 23, and the positive charge means one electron has been lost.

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7.

Which ion has 50 electrons?
- A.
  
  Sn
- B.
- C.
- D.
Correct Answer
B.

Explanation
An atom of tin has 50 electrons, but it is not an ion. The antimony cation has 50 electrons and is an ion, not an atom.

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8.

The electron was first proposed to exist based primarily on the results of which experiment?
- A.
  
  Thomson's cathode ray tube experiment
- B.
  
  Rutherford's gold foil experiment
- C.
  
  Bohr's interpretation of the balmer formula
- D.
  
  Frankensteins Transylvania experiments with lightning and corpses
Correct Answer
A. Thomson's cathode ray tube experiment

Explanation
Thomson correctly interpreted the cathode ray tube as containing a beam of electrons based on its magnetic and physical properties, the most important being that the beam consisted of particles one thousand times less massive than a hydrogen atom.

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9.

Which key experiment or observation resulted in the concept that electrons reside in shells?
- A.
  
  Thomson's cathode ray tube experiment
- B.
  
  Rutherford's gold foil experiment
- C.
  
  Bohr's interpretation of the Balmer Formula as it relates to atomic emission spectra
- D.
  
  Professor Utonium's experiments with chemical x. leading to the creation of the power puff girls
Correct Answer
C. Bohr's interpretation of the Balmer Formula as it relates to atomic emission spectra

Explanation
The Balmer formula predicts the sharp wavelengths of light created by ionized hydrogen gas. Balmer interpreted the two integers required to solve the formula as inner and outer shell that an electrons passes between that creates those precise wavelengths of light.

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