Final Exam Review-Part 1

Final Exam Review-Part 1

Multiple Choice

What type of reaction is this?

• Exothermic

• Endothermic

• Energy Producing

• No way to tell

Multiple Choice

This diagram is exothermic. Why?

• Products are always at a lower energy compared to the reactants

• Products are always at a higher energy compared to the reactants

• Reactants are always the same as the products

• There is no change between products & reactants

Multiple Choice

During an exothermic reaction, heat is _________ and chemical bonds __________.

• released, formed

• absorbed, broken

• released, broken

• absorbed, formed

Multiple Choice

Calculate (H) from the energy diagram.

Product - Reactant=(H)

• +200kj

• -200kj

• +400kj

• -400kj

Multiple Choice

Which statement is true regarding endothermic reactions?

• a) Temperature change is positive and enthalpy change is positive
• b) Temperature change is positive and enthalpy change is negative
• c) Temperature change is negative and enthalpy change is positive
• d) Temperature change is negative and enthalpy change is negative

Multiple Choice

Are the products or reactants of this reaction storing more energy in their chemical bonds?

• Both storing the same

• No way to tell

• Products

• Reactants

Multiple Choice

What energy is stored and waiting to be used?

• Kinetic Energy

• Potential Energy

Multiple Choice

During an endothermic reaction, heat is ________ and chemical bonds _______.

• released, formed

• absorbed, broken

• released, broken

• absorbed, formed

Multiple Choice

What is true of this reaction?

• Equal amounts of energy were released and absorbed
• The reaction released more energy than it absorbed
• The reaction absorbed more energy than it released

Multiple Choice

What is the sign of ΔH for all endothermic reactions?

• Positive
• Negative

Multiple Choice

What is the ΔH of this reaction?

• 40 kJ

• 20 kJ

• 80 kJ

• -60 kJ

Multiple Choice

Which of the following explains why the reaction shown would not chemically break apart without the addition of heat?

• collision between molecules don't have enough potential energy to break the bonds

• collision between molecules don't have enough kinetic energy to break the bonds

Multiple Choice

How many protons are in this element?

• 79
• 196
• 117
• Cannot be determined

Multiple Choice

a unique number for each element that equals the number of protons in an atom of that element

• element name

• element symbol

• atomic number

• atomic mass

Multiple Choice

What is the atomic number of Barium, Ba? (enlarge the periodic table)

• 20

• 38

• 56

• 88

Multiple Choice

If an atom has 10 electrons, how many protons does it have?

• 0

• 1

• 10

• 5

Multiple Choice

An element has the mass number 12 and atomic number 6. The number of neutrons in it is:

• 6

• 10

• 4

• 8

Multiple Choice

How many neutrons are in a Gold atom?

• 79
• 196
• 118
• 275

Multiple Choice

Which of the following atomic symbols for bromine is written correctly?

• bR
• BR
• Br
• br

Multiple Choice

The vertical (up and down) columns in the Periodic Table are called

• groups

• towers

• periods

• atomic numbers

Multiple Choice

Elements in a ..................have similar chemical properties.  

• period
• group
• row

Multiple Choice

The Modern Periodic Table of Elements is arranged by

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Multiple Choice

This element has two valence electrons and two energy levels?

• Beryllium (Be)

• Lithium (Li)

• Zinc (Zn)

Multiple Choice

This element has two valence electrons and two energy levels?(enlarge the periodic table)

• Beryllium (Be)

• Lithium (Li)

• Zinc (Zn)

Multiple Choice

Which elements have the most similar chemical properties? (enlarge the periodic table)

• K and Na

• K and Ca

• K and Cl

• K and S

Multiple Choice

These determine the reactivity of an element...

• Valence electrons
• Valence Protons
• Valence Neutrons
• Valence Quark

Multiple Choice

Find net charge of Oxygen.

Atomic number= 8

Neutrons= 8

Protons = 8

Electrons= 8

• 0

• +1

• -1

• +2

Multiple Choice

What is the charge of this ion?

• +1

• -1

• +5

• -6

Multiple Choice

Find net charge of Calcium.

Atomic number= 20

Neutrons= 20

Protons = 20

Electrons= 18

• 0

• +1

• -1

• +2