Organic Chemistry worksheets
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A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Which conclusion is BEST supported by this observation?
A chemical change took place.
The lithium was dissolved by the water
Dissolved gases were released.
Water was vaporized.
Where are the most reactive metals located on the periodic table?
the uppermost complete row of the table
the rows at the bottom of the table connecting two section
the column at the far left side of the table
the second column from the right side of the table
Where are the most reactive nonmetals located on the periodic table?
the uppermost complete row of the table
the rows at the bottom of the table connecting two sections
the column at the far left side of the table
the second column from the right side of the table
What physical property is characteristic of all of the elements in the group located in the rightmost column of the periodic table?
very high melting point
gas state at room temperature
good conductor of electric current
extremely brittle solid at room temperature
How does the concept of conservation of mass apply to chemical reactions?
The reactants and products have exactly the same atoms.
The reactants and products have exactly the same molecules.
The change in the amount of matter is equal to the change in energy.
The change in the amount of matter is only a small percentage of the total mass.
Which substance is composed of only one type of atom?
water
gold
salt
sugar
The columns of the periodic table are organized to show the
similarities of the reactivity in groups.
number of neutrons in a column.
sum of atomic weights per column.
amount of radioactivity in each group.
Which is the BEST evidence that a chemical change has occurred?
change of state
release of energy
temperature change
formation of a new substance
When oxygen combines with hydrogen, which substance is formed?
water
vinegar
hydrochloric acid
hydrogen dioxide
Which characteristic of an element determines its placement in the periodic table?
mass
size
number of neutrons
number of protons
Which statement best explains how the periodic table is organized?
increasing atomic number from left to right
increasing number of neutrons from left to right
decreasing number of electrons from left to right
decreasing atomic mass number from left to right
How does a balanced chemical equation satisfy the Law of Conservation of Mass?
During a chemical reaction, the total amount of matter stays the same.
During a chemical reaction, matter is destroyed.
During a chemical reaction, one or more new substances are formed.
During a chemical reaction, the total number of atoms increases.
Which is true of a chemical equation?
Products and reactants must be balanced.
Subscripts must be used with all products and reactants.
Energy must be included in the beginning of the reaction.
Coefficients must be used with all products and reactants.
Max combines baking soda and vinegar in a flask. Which is the most likely reason Max should place a balloon over the mouth of the flask before he mixes the two substances?
to prevent any gas formed as a product from escaping during the reaction
to prevent any liquid used as a reactant from escaping during the reaction
to prevent any powder used as a reactant from escaping during the reaction
to prevent any liquid formed as a product from escaping during the reaction
The compound propane has three carbon atoms and eight hydrogen atoms. What is the chemical formula of propane?
CH11
C3H8
C8H3
C11H
The burning of fossil fuels affects the atmosphere by
putting more oxygen in the atmosphere.
reducing the amount of necessary heat.
taking water vapor out of the atmosphere.
adding more heat and carbon dioxide.
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