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WorksheetsSG Chemistry Final Exam Sp 23
Total questions: 84
Worksheet time: 1hrs 11mins
Which particles are responsible for creating chemical bonds between atoms? (a)
An atom's valence electrons are located where? (a)
Mark all particles within the nucleus of a Carbon atom.
Protons
Neutrons
Electrons
Positrons
Which particles are responsible for preventing the protons of an atom's nucleus from repelling each other and flying into space? (a)
How many bonds can Nitrogen make?
1
3
2
5
What is the mass of the Chlorine gas?
2NaCl + F2 ➜ 2NaF + Cl2
5 g + 3 g = 4g + (a) g
Hint: What goes in must come out.
What is the purpose of an enzyme? (a)
Three truths and a lie. Choose the lie.....
The Maillard reactions produce what?
Browning of the surface of the food
The nice cooking smell
The crunch of the bread crust
The bubbles in the bread
Which characteristics describe an acid? (a)
We can identify (a) and compounds in distant (b) by looking at their (c) and finding the (d) of individual elements and molecules.
Select all the actions that involve chemistry.
Baking a cake
Burning gasoline in an engine
the power from the battery in your cell phone.
Making the plastic case on your phone
Each (a) gives off its own unique (b) when excited with enough (c) to produce plasma.
Which characteristics describe a base?
tastes sour, Has a pH lower than 7
tastes bitter, Has a pH greater than 7
tastes bitter sour, lHas a pH of 7
tastes bitter sour, Has no pH
What property do all three of these fruits have in common?
taste bitter and has a pH greater than 7
cannot conduct electricity
have pH below 7 and a sour taste
Are a great source of protein.
The surrounding temperature gets cold in an (a) reaction.
HCl reacts with Zn giving off heat. This reaction must be (a) .
Hydrocarbon combustion is considered a (a) reaction.
A hot pack uses an __________________ reaction.
endothermic
exothermic
Energy in fuel is stored where in the molecules?
Protons
Electrons
Bonds
Light
Heat is __________________.
The wiggles or motion in a molecule or atom.
the absence of cold
The amount of cold
heat travels in a substance by________.
particles hitting into other particles, transferring their energy.
energy being passed between particles as light.
energy being sucked into areas that have no energy.
Increasing temperature has what effect on reaction rate?
No effect
Increasing temperature lowers reaction rate
Increasing temperature increases reaction rate
What are you talking about?
Kinetic Molecular Theory (or Collision Theory) states that....
reaction rate increases when particles collide more
reaction rate is not affected by collisions
reaction rate increases as there are fewer collisions
there is no relationship between collisions and reaction rate.
Pick the TWO (2) options that will INCREASE the rate of a reaction.
Reducing Heat
Adding Catalyst
Adding Heat
Removing Catalyst
__________________ occurs when the nuclei of atoms become unstable and split apart into smaller particles in a sustained chain reaction. An Atom Bomb is an uncontrolled version of this.
Nuclear Decay
Nuclear Fission
Nuclear Fusion
None of the above
What is the major drawback to fission power?
Radioactive Waste
CO2 Emissions
SO2 Emissions
All of the Above
Which one is a big problem with using a nuclear fission reactor?
Emits lots of CO2, a green house gas
Supplies plentiful energy
Produces highly radioactive wastes.
Eliminates millions of tons of air pollution.
Read the passage labeled 5.9
This text is mainly about:
The different types of inventions.
One type of battery that was made 2000 years ago.
How batteries evolved during the past 2000 years
How humans changed over the past 2000 years
_______ reaction always starts with a Hydrocarbon that reacts with oxygen and produces carbon dioxide and water.
Example: CH4 + O2--> CO2 + H2O
Decomposition
Synthesis
Combustion
Single Replacement
A _______ reaction is when one reactant splits into several products.
Decomposition
Synthesis
Combustion
Single Replacement
What type of reaction involves two reactants forming one product?
For example: 2H2 + O2 --> 2H2O
Decomposition
Synthesis
Combustion
Single Replacement
__Na + __Cl2 --> __NaCl
Balance this reaction so there are the ame number of atoms of each element on both sides of the reaction
1,1,2
2,1,2
2,1,1
already balanced
Which type of reaction is:
2 NH3 + H2SO4 → (NH4)2SO4
The two sides of a chemical equation are called?
Reactants (left) and Products (right)
Ingredients (left) and Product (right)
Cations and Anions
Reactants (left) and Results (right)
Mg + __HCl ---> MgCl2 + H2
1
2
3
4
Choose all the items that are elements.
NaCl (table salt)
Sulfur
O2
Water
Air
Choose all of the items that are compounds.
NaCl (table salt)
Sulfur
O2
Water
Air
According to the periodic table, which element is similar to F? (Hint: Look at the column)
Ne
Cl
Na
C
Which element is similar to He?
H
Ar
Hi
Li
Which element is the least reactive?
Li
Ne
B
C
What is the chart called that organizes all of the elements found on Earth?
Element Chart
Table of Elements
Periodic Table of Elements
What are the columns referred to on the Periodic Table of Elements?
Families or groups
Periods
Elements on the Periodic Table of the Elements are classified into categories such as
rocks and minerals
molecules and atoms
metals and nonmetals
The majority (most) of the elements are:
metals
nonmetals
metalloids
gasses
If I gain electrons I become
Positive because I've added to my atom
negative because I've added negative charge
same because i'm balanced
equal because now I have electrons
How do the following two elements bond together?
Na F
NaF
NaF3
Na3F
Na1F2
What is formula when calcium and chlorine combine?
CaCl
CaCl2
ClClO3
CaC2
Hydrogen
H
He
Li
Hy
Oxygen
Ox
En
O
Non of the above
Na - Which element has this symbol?
Hydrogen
Neon
Sodium
Nitrogen
Carbon
Hydrogen
Aluminum
Lithium
Lemon is...?
an Acid
a Base
Neutral
vegatable
what is an atom?
Is just large enough to be seen with your eyes.
smallest part of a an element that has all the properties of that element
Smaller than a electron
Just one part of a mixture
An atom of carbon has 6 protons and 7 neutrons in its nucleus. If the atom is neutral, how many electrons does it have?
0
7
6
13
What type of bond is formed when atoms share electrons?
Covalent
Ionic
Hydrogen
Polyatomic
A substance with a pH of 8 is a
acid
base
neutral
Carbon has 4 valence electrons which means
it can only form bonds with carbon
it is stable
it can make ionic bonds
it wants to make 4 covalent bonds
Acids have more ______ ions than bases
OH-
H-
OH+
H+
An example of a carbohydrate would be
meat
milk
eggs
bread
Which of the following pH values would be considered most acidic?
1
3
7
13
The atomic number of oxygen is
8
15.9994
16
O
Chemistry is the study of
chemicals and chemical reactions
Ecosystems and plants
Dead things
Broken things
A molecule is _____.
a particle made up of atoms bonded together
A mixture of different types of elements
Just another word for a large atom.
unstable and will undergo radioactive decay.
Which of the following is a compound
air
nitrogen
carbon
carbon monoxide
Chemical safety goggles are used to protect your eyes from being injured.
True
False
Safety in the laboratory or workplace is the responsibility of who?
You
The President of the United States
Doesn't matter, it isn't important
Who needs safety? Live life. Who needs two eyes and 10 fingers?
Why does a collision with an airbag (a gas-filled bag) hurt less than a collision with a steering wheel (a solid)?
Particles of a gas have less mass than particles of a solid
Particles of a gas are smaller than particles of a solid
Gases are more chemically reactive than solids
Particles of a gas are spread apart and compressible, while particles of a solid are held firmly in one position
The Proteins in eggs are in nice bundles before cooking. What happens when they are cooked?
They start to decompose and turn white.
They unbundle and start to connect to one another.
They turn yellow.
They turn into water
Is cooking an egg a chemical or physical change?
Chemical change
Physical change
Baking a cookie is a chemical or physical change?
Chemical change
Physical change
