Question 1

According to Avogadro's hypothesis a liter of oxygen (O2) will react with _____ liter/s of carbon monoxide (CO) to give two liters of CO2.

Accepted Answer

Question 2

_____ rays are emitted when a high voltage is applied to a gas at low pressure contained in a sealed tube.

Accepted Answer

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

Question 3

Which of the following types of radiation has a positive charge?

Accepted Answer

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

Question 4

Exact numbers have _____ significant figures.

Accepted Answer

The answer of Exact numbers have _____ significant figures....

Question 5

Magnesium, calcium, and strontium are all alkali metals.

Accepted Answer

A) True 
 B)False

Question 6

"Metals are good conductors of electricity" is a _____.

Accepted Answer

A)  hypothesis 
B)  theory 
C)  law 
D)  qualitative observation 
E)  quantitative observation 
A)  hypothesis 
B)  theory 
C)  law 
D)  qualitative observation 
E)  quantitative observation

Question 7

Qualitative observations are measurements, which by definition consist of both a number and a unit.

Accepted Answer

A) True 
 B)False

Question 8

Boron occurs naturally in two isotopes 10B and 11B. The standard atomic mass of Boron is 10.811. What are the percentage abundances of 10B and 11B? (Given: exact mass of 10B = 10.01294 amu and 11B = 11.00931 amu)

Accepted Answer

A)  50% and 50% 
B)  60% and 40% 
C)  70% and 30% 
D)  90% and 10% 
E)  20% and 80% 
A)  50% and 50% 
B)  60% and 40% 
C)  70% and 30% 
D)  90% and 10% 
E)  20% and 80%

Question 9

List out the four fundamental hypothesis of Dalton's atomic theory.

Accepted Answer

@#LAT-DLM&All matter is composed of tiny indivisib

Question 10

The number of atoms in a volume of CO2 is _____ to the number of atoms in a volume of H2S.

Accepted Answer

Question 11

When dry salt is mixed with dry sugar it forms a(n) _____.

Accepted Answer

A)  alloy 
B)  solid solution 
C)  heterogeneous mixture 
D)  homogeneous solution 
E)  colloid 
A)  alloy 
B)  solid solution 
C)  heterogeneous mixture 
D)  homogeneous solution 
E)  colloid

Question 12

Which of the following mixtures would be best separated by filtration?

Accepted Answer

A)  A solution of salt in water 
B)  An alloy of zinc and iron 
C)  A mixture of carbon dioxide and oxygen 
D)  A mixture of water and alcohol 
E)  A mixture of sand and gravel 
A)  A solution of salt in water 
B)  An alloy of zinc and iron 
C)  A mixture of carbon dioxide and oxygen 
D)  A mixture of water and alcohol 
E)  A mixture of sand and gravel

Question 13

Which of the following elements is classified as a halogen?

Accepted Answer

A)  Copper 
B)  Lithium 
C)  Sulfur 
D)  Astatine 
E)  Krypton 
A)  Copper 
B)  Lithium 
C)  Sulfur 
D)  Astatine 
E)  Krypton

Question 14

The law of multiple proportions states that equal volumes of different gases contain equal numbers of gas particles.

Accepted Answer

A) True 
 B)False

Question 15

In Rutherford's gold foil experiments, the observation of particles being reflected back directly was due to:

Accepted Answer

A)  alpha particles being deflected off orbiting electrons in gold atoms. 
B)  alpha particles being deflected off neutrons scattered in gold atoms. 
C)  alpha particles causing the disintegration of the nuclei of the gold atoms. 
D)  alpha particles being deflected off protons present in the gold atoms nuclei. 
E)  alpha particles being deflected off dense electron clouds surrounding the nuclei. 
A)  alpha particles being deflected off orbiting electrons in gold atoms. 
B)  alpha particles being deflected off neutrons scattered in gold atoms. 
C)  alpha particles causing the disintegration of the nuclei of the gold atoms. 
D)  alpha particles being deflected off protons present in the gold atoms nuclei. 
E)  alpha particles being deflected off dense electron clouds surrounding the nuclei.

Question 16

Filtration is the best method for separating homogeneous mixtures.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following is an example of matter undergoing only a physical change?

Accepted Answer

A)  Carbon (solid) being burnt in air to form carbon dioxide (a gas) 
B)  Hydrogen (gas) forming water with oxygen (gas) 
C)  Water (liquid) forming steam (gas) after being heated 
D)  Chlorine (gas) forming Hydrogen Chloride (liquid) when mixed with water 
E)  Sodium (solid) forming sodium hydroxide (aqueous) when mixed with water. 
A)  Carbon (solid) being burnt in air to form carbon dioxide (a gas) 
B)  Hydrogen (gas) forming water with oxygen (gas) 
C)  Water (liquid) forming steam (gas) after being heated 
D)  Chlorine (gas) forming Hydrogen Chloride (liquid) when mixed with water 
E)  Sodium (solid) forming sodium hydroxide (aqueous) when mixed with water.

Question 18

Which of the following is an element?

Accepted Answer

A)  Steel 
B)  Sugar 
C)  Lead 
D)  Air 
E)  Salt 
A)  Steel 
B)  Sugar 
C)  Lead 
D)  Air 
E)  Salt

Question 19

Elements of group 1 of the periodic table are known as the _____.

Accepted Answer

The answer of Elements of group 1 of the periodic...

Question 20

Marie Curie coined the term _____ to describe the spontaneous emission of energy rays by matter.

Accepted Answer

The answer of Marie Curie coined the term _____ to...

Exam 1: Introduction to Chemistry

According to Avogadro's hypothesis a liter of oxygen (O2) will react with _____ liter/s of carbon monoxide (CO) to give two liters of CO2.

_____ rays are emitted when a high voltage is applied to a gas at low pressure contained in a sealed tube.

Which of the following types of radiation has a positive charge?

Exact numbers have _____ significant figures.

Magnesium, calcium, and strontium are all alkali metals.

"Metals are good conductors of electricity" is a _____.

Qualitative observations are measurements, which by definition consist of both a number and a unit.

Boron occurs naturally in two isotopes 10B and 11B. The standard atomic mass of Boron is 10.811. What are the percentage abundances of 10B and 11B? (Given: exact mass of 10B = 10.01294 amu and 11B = 11.00931 amu)

List out the four fundamental hypothesis of Dalton's atomic theory.

The number of atoms in a volume of CO2 is _____ to the number of atoms in a volume of H2S.

When dry salt is mixed with dry sugar it forms a(n) _____.

Which of the following mixtures would be best separated by filtration?

Which of the following elements is classified as a halogen?

The law of multiple proportions states that equal volumes of different gases contain equal numbers of gas particles.

In Rutherford's gold foil experiments, the observation of particles being reflected back directly was due to:

Filtration is the best method for separating homogeneous mixtures.

Which of the following is an example of matter undergoing only a physical change?

Which of the following is an element?

Elements of group 1 of the periodic table are known as the _____.

Marie Curie coined the term _____ to describe the spontaneous emission of energy rays by matter.

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

Filters

According to Avogadro's hypothesis a liter of oxygen (O₂) will react with _____ liter/s of carbon monoxide (CO) to give two liters of CO₂.

Boron occurs naturally in two isotopes ¹⁰B and ¹¹B. The standard atomic mass of Boron is 10.811. What are the percentage abundances of ¹⁰B and ¹¹B? (Given: exact mass of ¹⁰B = 10.01294 amu and ¹¹B = 11.00931 amu)

The number of atoms in a volume of CO₂ is _____ to the number of atoms in a volume of H₂S.