Question 1

Which of the following elements is an essential component of the human diet?

Accepted Answer

A)  Copper 
B)  Silver 
C)  Aurum 
D)  Cadmium 
E)  Germanium 
A)  Copper 
B)  Silver 
C)  Aurum 
D)  Cadmium 
E)  Germanium A

Question 2

A mass spectrometer measures the _____ of an atom.

Accepted Answer

A)  mass number 
B)  absolute atomic mass 
C)  absolute atomic number 
D)  relative atomic mass 
E)  relative atomic number 
A)  mass number 
B)  absolute atomic mass 
C)  absolute atomic number 
D)  relative atomic mass 
E)  relative atomic number D

Question 3

Essential elements are restricted to the first _____ rows of the periodic table.

Accepted Answer

five

Question 4

Atoms that have the same number of protons but different numbers of neutrons are called _____.

Accepted Answer

A)  isomers 
B)  epimers 
C)  isotopes 
D)  enantiomers 
E)  diastereomers 
A)  isomers 
B)  epimers 
C)  isotopes 
D)  enantiomers 
E)  diastereomers

Question 5

Halogens react readily with metals to form salts.

Accepted Answer

A) True 
 B)False

Question 6

The mechanism by which trace elements interact or regulate the levels of large amounts of other molecules is called _____.

Accepted Answer

A)  elevation 
B)  amplification 
C)  escalation 
D)  active regeneration 
E)  cyclization 
A)  elevation 
B)  amplification 
C)  escalation 
D)  active regeneration 
E)  cyclization

Question 7

_____ is the only atom whose exact atomic mass is equal to its mass number.

Accepted Answer

A)  (1H) 
B)  (16O) 
C)  (9Na) 
D)  (12
C)  
E)  (3He) 
A)  (1H) 
B)  (16O) 
C)  (9Na) 
D)  (12
C)  
E)  (3He)

Question 8

List out the properties of protons, neutrons, and electrons?

Accepted Answer

@#LAT-DLM&Electrons and protons have electrical ch

Question 9

_____ rays can be stopped by a sheet of paper.

Accepted Answer

A)  Alpha 
B)  Cathode 
C)  Gamma 
D)  Beta 
E)  X 
A)  Alpha 
B)  Cathode 
C)  Gamma 
D)  Beta 
E)  X

Question 10

The number 23.068 has five significant figures.

Accepted Answer

A) True 
 B)False

Question 11

Measurements may be ______, meaning that the measured value is the same as the true value.

Accepted Answer

The answer of Measurements may be ______, meaning that the...

Question 12

Which of the following is an intensive property of a material?

Accepted Answer

A)  Mass 
B)  Volume 
C)  Density 
D)  Surface area 
E)  Weight 
A)  Mass 
B)  Volume 
C)  Density 
D)  Surface area 
E)  Weight

Question 13

Rubidium and strontium are examples of essential trace elements.

Accepted Answer

A) True 
 B)False

Question 14

Oxygen, carbon, hydrogen, nitrogen, and sulfur are _____ elements, the building blocks of the compounds that constitute our organs and muscles.

Accepted Answer

The answer of Oxygen, carbon, hydrogen, nitrogen, and sulfur are...

Question 15

The flammability and susceptibility to corrosion of a substance are examples of its _____ properties.

Accepted Answer

The answer of The flammability and susceptibility to corrosion of...

Question 16

Which of the following elements is a bulk element?

Accepted Answer

A)  Sulfur 
B)  Calcium 
C)  Zinc 
D)  Chlorine 
E)  Sodium 
A)  Sulfur 
B)  Calcium 
C)  Zinc 
D)  Chlorine 
E)  Sodium

Question 17

Trace elements are present in very small amounts, ranging from a few grams to a few milligrams in an adult human.

Accepted Answer

A) True 
 B)False

Question 18

The average deviation of a set of measurements allows one to assess the _____.

Accepted Answer

A)  error involved in the measurements 
B)  the accuracy of the measurement 
C)  the closeness of each measurement to the actual value 
D)  precision of the measurements 
E)  the probability of the measurements being wrong 
A)  error involved in the measurements 
B)  the accuracy of the measurement 
C)  the closeness of each measurement to the actual value 
D)  precision of the measurements 
E)  the probability of the measurements being wrong

Question 19

_____ states that in any chemical reaction, the mass of the substances that react equals the mass of the products that are formed.

Accepted Answer

A)  The law of conservation of mass 
B)  The law of definite proportions 
C)  The atomic theory of matter 
D)  The law of multiple proportions 
E)  The law of conservation of matter 
A)  The law of conservation of mass 
B)  The law of definite proportions 
C)  The atomic theory of matter 
D)  The law of multiple proportions 
E)  The law of conservation of matter

Question 20

Explain the principle behind the working of a mass spectrometer.

Accepted Answer

First, electrons are removed from or add

Exam 1: Introduction to Chemistry

Which of the following elements is an essential component of the human diet?

A mass spectrometer measures the _____ of an atom.

Essential elements are restricted to the first _____ rows of the periodic table.

Atoms that have the same number of protons but different numbers of neutrons are called _____.

Halogens react readily with metals to form salts.

The mechanism by which trace elements interact or regulate the levels of large amounts of other molecules is called _____.

_____ is the only atom whose exact atomic mass is equal to its mass number.

List out the properties of protons, neutrons, and electrons?

_____ rays can be stopped by a sheet of paper.

The number 23.068 has five significant figures.

Measurements may be ______, meaning that the measured value is the same as the true value.

Which of the following is an intensive property of a material?

Rubidium and strontium are examples of essential trace elements.

Oxygen, carbon, hydrogen, nitrogen, and sulfur are _____ elements, the building blocks of the compounds that constitute our organs and muscles.

The flammability and susceptibility to corrosion of a substance are examples of its _____ properties.

Which of the following elements is a bulk element?

Trace elements are present in very small amounts, ranging from a few grams to a few milligrams in an adult human.

The average deviation of a set of measurements allows one to assess the _____.

_____ states that in any chemical reaction, the mass of the substances that react equals the mass of the products that are formed.

Explain the principle behind the working of a mass spectrometer.

Molecules, Ions, and Chemical Formulas

Chemical Reactions

Reactions in Aqueous Solution

Energy Changes in Chemical Reactions

The Structure of Atoms

The Periodic Table and Periodic Trends

Ionic Versus Covalent Bonding

Molecular Geometry and Covalent Bonding Models

Gases

Liquids

Solids

Solutions

Chemical Kinetics

Chemical Equilibrium

Aqueous Acidbase Equilibriums

Solubility and Complexation Equilibriums

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Periodic Trends and the S-Block Elements

The P-Block Elements

The D-Block Elements

Organic Compounds

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