WorksheetsChemistry 9 Notes Review
Total questions: 1
Worksheet time: 2hrs 39mins
What is WHMIS an acronym for?
Workplace Hazardous Materials Information System
Work Health and Management Information System
Workplace Hazardous Management Information Service
Work Health and Materials Information System
How many ways are there to provide information on hazardous materials according to WHMIS?
1
2
3
4
What does the WHMIS symbol for "Compressed gas" look like?
A closed, sealed cylinder
A flame over a circle
A test tube pouring out liquid
A circle with flames around it
What hazard is associated with the WHMIS symbol for "Flammable/combustible"?
May explode
May catch fire/explode in presence of a spark
Increase risk of fire if in contact with flammable material
Unstable, may explode or react dangerously
Which WHMIS symbol indicates a material that is "Oxidizing" and increases the risk of fire?
A flame over a circle
A circle with flames around it
An exclamation mark
Three interlocking circles
What is the hazard associated with the WHMIS symbol that has an exclamation mark?
May explode
May catch fire/explode in presence of a spark
May cause less serious health effects or damage ozone layer
May harm aquatic environments
Which WHMIS symbol is used to indicate a "Biohazard"?
A flame
A skull and crossbones
Three interlocking circles
A trefoil (three-leaf symbol)
What is Chemistry the study of?
The study of energy forms
The study of the composition, properties, and reactions of matter
The study of physical properties only
The study of chemical properties only
Which of the following is not a physical property of matter?
Colour
Odour
Reactivity
Density
What does the term 'combustibility' refer to in the context of chemical properties?
Ability to conduct electricity
Ability to bend without breaking
Ability to burn
Ability to reflect light
Which of the following is a chemical property?
Malleability
Melting/boiling points
Toxicity
Lustre
Identify the following characteristic as physical (P) or Chemical (C) property: Iron is magnetic.
P
C
Identify the following characteristic as physical (P) or Chemical (C) property: Copper can bend without breaking.
P
C
Both P and C
Neither P nor C
Identify the following characteristic as physical (P) or Chemical (C) property: Temperature.
P
C
Both P and C
Neither P nor C
Identify the following characteristic as physical (P) or Chemical (C) property: Paper is flammable.
P
C
Both P and C
Neither P nor C
Identify the following characteristic as physical (P) or Chemical (C) property: Apples are red.
P
C
Both P and C
Neither P nor C
Identify the following characteristic as physical (P) or Chemical (C) property: A substance reacts violently with sodium.
P
C
Both P and C
Neither P nor C
Identify the following characteristic as physical (P) or Chemical (C) property: Length of a piece of silver.
P
C
Both P and C
Neither P nor C
Identify the following characteristic as physical (P) or Chemical (C) property: Mass of a piece of gold.
P
C
Both P and C
Neither P nor C
Identify the following characteristic as physical (P) or Chemical (C) property: Salt is a solid.
P
C
Both P and C
Neither P nor C
Identify the following characteristic as physical (P) or Chemical (C) property: Chocolate can be lethal to dogs.
P
C
Both P and C
Neither P nor C
Identify the following characteristic as physical (P) or Chemical (C) property: A substance has a rough texture.
P
C
Both P and C
Neither P nor C
Identify the following characteristic as physical (P) or Chemical (C) property: A substance melts at 5 degrees.
P
C
Both P and C
Neither P nor C
In scientific language, what does a "theory" explain?
What happens
How or why something happens
The average temperature of the earth
The behavior of different elements based on their atomic makeup
What is a "law" in scientific terms?
A description of events, patterns, or relationships that have been observed repeatedly
An explanation of events, patterns, or relationships that have been observed repeatedly
A hypothesis that is yet to be tested
A theory that has been proven wrong
Which of the following statements is true about scientific laws?
A law is more legitimate than a theory
A law can become a theory
Laws are what happens, theories explain why it happens
Laws describe how something happens
Which of the following would be better described as a "law"?
Matter cannot be created or destroyed
The universe was created by a massive expansion event called the "Big Bang"
Hubble calculated the rate at which the universe is expanding
Darwin explained that evolution is caused by natural selection
Who was the first to suggest the concept of the atom as the smallest piece that you could divide something into?
John Dalton
J. J. Thomson
Ernest Rutherford
Democritus
What is the main idea of Dalton's Atomic Theory?
Atoms are divisible into smaller particles
Atoms of the same element can be created and destroyed
All matter is made up of indivisible particles called atoms
Atoms of different elements are different from each other
Which model of the atom is described as having electrons scattered throughout a positive area of the atom?
Nuclear model
Planetary model
Billiard ball model
Plum pudding/chocolate chip cookie model
According to Niels Bohr, how do electrons behave within an atom?
Electrons are scattered throughout a positive area
Electrons circle the nucleus at different energy levels from the nucleus
Electrons circle the center of the atom
Electrons can be created and destroyed
What are atoms made up of according to the structure of the atom section?
Protons and electrons only
Neutrons and electrons only
Protons, neutrons, and electrons
Protons, neutrons, and quarks
What is the charge of a proton?
Negative
Neutral
Positive
No charge
Where is the neutron located in an atom?
Outside nucleus in orbits
Inside nucleus
In the electron cloud
In the surrounding environment
Which subatomic particle has effectively no mass?
Proton
Neutron
Electron
Positron
What part of the atom has all of the mass?
The electron cloud
The nucleus
The orbits
The outer shell
Which statement is true about the number of protons and electrons in an atom?
The number of protons is always more than electrons.
The number of protons is always less than electrons.
The number of protons and electrons is equal, making charges balanced.
The number of protons and electrons is not related.
If a liquid had the symbol shown on the container and you needed to pour it into a new bottle, what precautions might you take?
Pour it quickly without any precautions.
Use gloves and pour it carefully to avoid spills.
Taste a small amount before pouring to check its properties.
Heat the liquid before pouring to reduce its viscosity.
You need to transport a substance with the symbol shown across the island, what precautions might you take?
Carry it openly without any container.
Transport it in a sealed and labeled container, using a vehicle if possible.
Leave it in the sun to reduce its potency before transporting.
Shake the container well before transporting.
What defines an element according to the document?
A substance that can be broken down into simpler substances
A pure substance that cannot be broken down into simpler substances
A mixture of two types of atoms
A compound formed by chemical reactions
Which of the following is true about the symbols for elements?
Symbols are always two uppercase letters
Symbols can be an uppercase letter or one uppercase and one lowercase letter
Symbols are always three letters long
Symbols are always in lowercase letters
Who was the first person to develop the periodic table?
Albert Einstein
Isaac Newton
Dmitri Mendeleev
Marie Curie
What do periods in the periodic table represent?
Vertical columns of the periodic table
Diagonal lines of the periodic table
Horizontal rows of the periodic table
The number of protons in an element
What do groups/families in the periodic table represent?
Horizontal rows of the periodic table
The atomic mass of elements
Vertical columns of the periodic table
The number of electrons in an element
What information does the atomic number of an element represent?
The mass of 1 atom of the element
The number of neutrons in the element
The number of protons in each atom of that element
The number of electrons in each atom of that element
How did Mendeleev organize the elements in his periodic table?
By their state at room temperature
According to their atomic mass only
According to similar properties that were observed
Based on the alphabetical order of their names
What is the atomic number of Nitrogen as shown in the document?
7
14
8
15
What is the atomic mass of Nitrogen according to the image in the document?
(a)
What is the symbol for Sodium?
Na
S
Sa
So
What is the atomic number of Cerium?
58
55
60
140
What is the atomic mass of Zinc (Zn)?
65.38
64.007
65.409
66.38
Which element has the symbol 'O'?
Oxygen
Osmium
Gold
Iron
What is the atomic number of Chlorine?
17
14
35
18
What is the atomic mass of Lead?
204.38
207.2
206.98
207.868
Atoms are made up of how many types of subatomic particles?
2
3
4
5
What is equal to the atomic number in an atom?
Number of neutrons
Number of electrons
Number of protons
Atomic mass
How do you calculate the number of neutrons in an atom?
Add the atomic number to the atomic mass
Subtract the atomic number from the atomic mass
Multiply the atomic number by the atomic mass
Divide the atomic mass by the atomic number
According to the example provided for Argon (Ar), if the atomic number is 18 and the atomic mass is 40, how many neutrons does it have?
18
20
22
40
Why is the number of electrons equal to the number of protons in an atom?
To maintain the atomic mass
To balance the charges
To equal the atomic number
To increase the atomic size
How many electrons can the first, second, and third energy levels hold in an atom respectively?
2, 8, 18
2, 8, 8
8, 8, 18
8, 18, 32
What is the purpose of a Bohr diagram?
To show the number of protons in an element
To show the number of neutrons in an element
To show how the electrons in an element are arranged
To show the chemical reactions between elements
According to the example provided, how many valence electrons does sodium have?
2
1
3
8
What is the valence level of an atom?
The innermost energy level
The level with the most electrons
The outermost energy level
The level with the least electrons
What are valence electrons?
The electrons in the innermost energy level
The electrons in the nucleus
The electrons in the outermost energy level
The protons in the outermost energy level
Using the Bohr diagram for sodium as a reference, how many energy levels are occupied by electrons in a sodium atom?
1
2
3
4
What is the maximum number of electrons that the fourth energy level can hold?
2
8
18
32
Which of the following properties is common to metals at room temperature?
Typically gases or solid
Dull
Good conductors of heat and electricity
Brittle
What distinguishes metalloids from metals and non-metals in terms of conductivity?
They are good conductors of heat
They may conduct electricity
They are poor conductors of heat and electricity
They are shiny
Which group in the periodic table contains elements with 1 valence electron?
Alkali Metals (Group 1)
Alkaline Earth Metals (Group 2)
Halogens (Group 17)
Noble Gases (Group 18)
What is the state of noble gases at room temperature?
Solid
Liquid
Gas
Plasma
Which of the following elements is an example of a transition metal?
Li
Be
F
Ni
What characteristic of alkali metals makes them different from alkaline earth metals?
Alkali metals have -2 valence electrons
Alkali metals are less reactive than alkaline earth metals
Alkali metals are the most reactive elements
Alkali metals have a full outer electron shell
Which of the following is not a property of non-metals?
Typically solid at room temperature
Shiny appearance
Poor conductors of heat and electricity
Brittle
What is the special characteristic of hydrogen that sets it apart from other alkali metals?
It has 1 valence electron
It is a gas at room temperature
It is the most reactive element
It doesn't fit in with group 1
What does the atomic number of an element reveal about the structure of its atoms?
The number of neutrons in the nucleus
The number of protons in the nucleus
The total mass of the atom
The number of electrons in the outer shell
Which element has an atomic number of 18?
K
Mg
Nitrogen
Argon
An atom has an atomic number of 24 and has 28 neutrons. What is the mass of this element?
24
28
52
56
How many electrons does an element with an atomic number of 24 have?
24
28
52
56
How many valence electrons does an element with an atomic number of 24 have?
2
4
6
8
Why is hydrogen a unique element?
It is the only element that is a liquid at room temperature.
It is the only element that can exist without neutrons.
It is the only element that is a noble gas.
It is the only element that can bond with any other element.
Why are some elements close to Silicon shiny and conductive while others are dull and not conductive?
Because they are noble gases
Because they are nonmetals
Because they are metalloids
Because they are alkali metals
Which family contains solids, liquids, and gases?
Alkali metals
Halogens
Noble gases
Transition metals
List two properties of noble gases.
Reactive and form compounds easily
Shiny and good conductors of electricity
Colorless, odorless, and inert
High melting and boiling points
Describe two differences between the atomic models proposed by two different scientists.
One model proposed that atoms are indivisible, while the other suggested the presence of subatomic particles.
One model proposed that electrons move in fixed orbits, while the other suggested that electrons move randomly.
One model proposed that atoms are the smallest particles, while the other suggested that atoms can be broken down into protons and neutrons.
One model proposed that atoms are solid spheres, while the other suggested that atoms have a nucleus and electron cloud.
Metals are malleable. Is this a chemical or physical property?
Chemical property
Physical property
Biological property
None of the above
Water freezes at 0 degrees Celsius. Is this a chemical or physical property?
Chemical property
Physical property
Biological property
None of the above
Chlorine is a gas. Is this a chemical or physical property?
Chemical property
Physical property
Biological property
None of the above
Propane burns. Is this a chemical or physical property?
Chemical property
Physical property
Biological property
None of the above
Cough syrup can be harmful in large doses. Is this a chemical or physical property?
Chemical property
Physical property
Biological property
None of the above
How does the Bohr diagram for Neon (Ne) help to explain one of Neon's properties?
It shows that Neon has a full outer shell, explaining its non-reactivity.
It indicates that Neon can easily gain electrons, making it highly reactive.
It demonstrates that Neon has a single electron, making it a good conductor.
It reveals that Neon can bond with many other elements due to its valence electrons.
What is a compound?
A pure substance made of only one type of atom
A mixture of two or more different molecules
A pure substance made of two or more different elements joined together
A chemical bond between atoms
What are chemical bonds?
The process of mixing elements
The reaction between compounds
The links between atoms in a compound
The creation of new elements
Which of the following is a characteristic of covalent compounds?
Made up of a metal and a nonmetal
Exchange electrons
Made up of two or more nonmetals
Always liquid at room temperature
What is the main difference between covalent and ionic compounds?
Covalent compounds are always gases, while ionic compounds are solids
Covalent compounds share electrons, while ionic compounds exchange electrons
Covalent compounds are made of metals, while ionic compounds are made of nonmetals
Covalent compounds have higher melting points than ionic compounds
What does a subscript in a chemical formula represent?
The charge of the atom
The number of molecules
The number of atoms of the element in the compound
The atomic mass of the element
If a chemical formula has an element symbol without a subscript, how many atoms of that element are present in the compound?
0
1
2
It cannot be determined
Which of the following compounds is ionic?
H2O
CO2
CH4
NaCl
