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WorksheetsChemistry: Chemical Reactions & Organic Compounds
Total questions: 65
Worksheet time: 51mins
The chemical element of atomic number 6, a nonmetal which has two main forms (diamond and graphite) and which also occurs in impure form in charcoal, soot, and coal.
Carbon
Oxygen
Element
Nitrogen
Organic compounds that are made of only hydrogen and carbon atoms. They are found in many places, including crude oil and natural gas.
Hydrocarbons
Nucleic Acids
Proteins
Lipids/Fats
They are the most abundant compounds found in living organisms, including polysaccharides which are polymers composed of many sugar building blocks. They are used by cells to get and store energy.
Polymers
Organic Compound
Carbohydrates
Carbon
Without these, cells could not live. Long chains of carbon and hydrogen molecules creating fatty acids.
Carbohydrates
Organic Chemistry
Proteins
Lipids
These are required for the structure, function, and regulation of the body's cells, tissues and organs. They help build organelles and help defend against illness.
Lipids
Proteins
Polymers
Monomers
1 of the 4 main categories of organic compounds. They are responsible for storing genetic information.
Compounds
Elements
Nucleic Acids
Polymers
What is the smallest building block of matter?
Compounds
mixtures
atoms
pizza
Which choice would be a molecule?
O
H
Au
H2
Which of the following is a chemical change?
A rusted can
A crushed can
A chopped piece of wood
Water evaporating
__K + __Br2 --> __KBr
2HI --> H2 + I2
Why are chemical equations always balanced? Select ALL that apply.
Matter cannot be created.
Matter cannot be destroyed.
Matter can only be rearranged/conserved.
Matter doesn't matter.
Starch is an example of a
A lipid
B nucleic acid
C protein
D carbohydrate
carbohydrate
lipid
nucleic acid
protein
A runner is preparing for the Boston Marathon. She wants her dinner the night before to give her energy to complete the race. Which of the following will provide the maximum amount of energy ?
a candy bar because of the sugar
coffee because of the caffeine
pasta because of the carbohydrates
steak because of the protein
Which organic molecule is found in the nucleus?
carbohydrate
lipid
nucleic acid
protein
Which of the choices below best completes the following description of a compound? " A substance that is made up of ...."
one kind of mixture
one kind of element
two or more elements
two or more atoms combined
Substances that can NOT be broken down chemically into substances are
solutions
mixtures
elements
compounds
Fill-in-the-blank: ______________ are a combination of two or more atoms that are held together by a covalent bond
elements
ions
metals
molecules
Which of the following results in a chemical reaction?
boiling water
bending a straw
burning wood
braiding hair
Complete the sentence that describes how elements and compounds are similar? " Elements and compounds...."
...can both be broken down by physical change
...are both made up of different kinds of atoms
... are both pure substances
... are both listed on the periodic table
Which of the following represents a chemical reaction?
blowing dry wet hair
slicing a loaf of bread into slices
food coloring is dropped into water and water turns green
in baking biscuits, the baking powder reacts to release carbon dioxide bubbles, The carbon dioxide cause the dough to rise
One chemical property that can be measured in a substance is its reactivity with water. What is another chemical property?
solubility
malleability
flammability
density
A beaker of ice and water is placed on a warm hot plate. Will ice undergo a physical or chemical change? Why?
physical change, because it changes state
physical change, because it forms a new substance
chemical change, because it forms a new substance
chemical change, because it changes state
One example of changing a substance chemically is by
painting it
filtering it
boiling it
burning it
A water molecule is made up of one Oxygen atom and two Hydrogen atoms. Why is water considered a pure substance?
Water can be combined with other substances by physical means
Water can be broken apart by physical means
Water molecules are made up of different types of atoms
Each water molecule is identical
What type of substance is made up of a single type of atom?
compound
element
mixture
molecule
Which of the following is an element?
copper
salt
sugar
water
"In every chemical operation an equal quality of matter exists before and after the operation" is a statement of the law of
Combining Volume
Conservation of Mass
Definite Proportions
Multiple Proportions
The atomic number of nitrogen is 7. The atomic mass is 14.01. This means that :
A small percentage of nitrogen atoms have fewer than 7 neutrons
A small percentage of nitrogen atoms have more than 7 neutrons
some nitrogen atoms have fewer than 7 electrons
all nitrogen atoms have exactly 7 neutrons
What coefficients would balance the following equation?
Al + O2 = Al2O3
4Al + 3O2 = 2Al2O3
2Al + 3O2O3
2Al + 3O2 = 1Al2O3
3Al + 3O2 = 2Al2O3
In a Lewis Dot diagram, the electrons shown:
always equal the number of protons
always add up to an even number
are in the inner most energy level
are in the outer most energy level
In the process of ionic bonding
atoms switch protons
both atoms lose electrons
both atoms gain electrons
one atom gains one or more electrons and the other loses the same number
Which coefficients would balance the following equation?
2C2H6 + 10O2 --> 4CO2 + 6H2O
2C2H6 + 7O2 --> 4CO2 + 6H2O
2C2H6 + 5O2 --> 4CO2 + 6H2O
1C2H6 + 5O2 --> 2CO2 + 3H2O
________________ is not a greenhouse gas
methane
helium
carbon dioxide
water vapor
What happens to the particles of a liquid as it becomes a gas?
Particles start to slow down and stand still
Particles condense to become closer and colder
Particles bounce to create electrical light currents
Particles spread further apart and begin to move faster and further apart.
______The three main parts of the atoms include all EXCEPT
photons that switch charges on valences
protons that are positively charged in nucleus
neutrons that are neutrally charged in nucleus
electrons that are negatively charged on outer shell
How is density calculated?
Multiplying the electrons in the outside valances
By dividing the mass by its volume of an object.
Adding weight and height of an object
Subtracting number of protons from atomic weight
______What is the periodic table?
a theory that atoms, molecules, & elements make great compounds
a chart that rates the most popular elements
chart of the elements showing the repeating pattern of their properties
A graph of the density of substances
Atmosphere is over 75% (percent) of this element
Carbon
Helium
Hydrogen
Nitrogen
Where on the element chart square will you find the Atomic number ?
By identifying the period row and family column it is in
Must do math to figure out
top of element square
under the symbol of the element
The ease with which an element combines with other elements and compounds is called
thermal energy
reactivity
malleability
James Bond effect
What holds atoms together in molecules?
thermal energy
chemical bonds that are also known as ionic bonds that exchange electrons
salt or sugar molecules
James Bond effect
You want to identify an element. How an you do so?
How can you tell one element from another?
by its color when changing state or cold
by its shape when melting or boiling
by specific physical and chemical properties
by its texture and combining with other elements
A coefficient in front of a molecule of a substance is the number of molecules of the reactant or product;
a number just below an element in a molecular formula indicates how many atoms of each element make up the molecule, and is called a(n) _____________.
subscript
symbol
charged ion
endothermic reaction
What is the smallest building block of matter?
Compounds
mixtures
atoms
pizza
