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WorksheetsChemical Reactions
Total questions: 70
Worksheet time: 35mins
A chemical change is different than a physical change because in a chemical change
chemicals are used
molecules do not physically touch
a new substance is formed and in a physical no new substance is formed
the change can be seen but in a physical change it cannot
Which of the following 2 are chemical reactions?
sugar dissolving in water
water turning into steam
burning wood
mixing baking soda and vinegar
tearing paper
How many Carbons are present on the reactant side?
1
2
3
4
How many Hydrogens are on the product side of this chemical equation?
1
2
3
4
How many Oxygens are on the product side of this chemical equation?
1
2
3
4
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.
In a chemical reaction, if the reactants are heated, the reaction usually happens
slower
faster
at the same rate
in a smaller volume
Is this chemical equation balanced? Why or why not? Choose the BEST answer.
Yes, the amount of atoms for each element are equal on both the reactant and product side.
No, the carbons are not the same number on both the reactant and product side.
No, neither the carbons or hydrogens are the same amount on both the reactant and product side.
No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.
Which of the following is a common sign that a chemical change has occurred?
A chemical has turned a different color, bubbled, and/or changed temperature.
A chemical has changed to a different state of matter, such as a liquid to a solid.
A chemical has changed size.
A chemical has become a different shape.
Which of the following is a chemical reaction?
Sodium and chlorine atoms bond to form salt molecules.
Ice melts to form water.
Carbon dioxide freezes to form dry ice.
Salt and water mix to form salt water
2H2 + O2 -> 2H2O
In the equation shown, what are the reactants?
Hydrogen atoms
Hydrogen and oxygen molecules
Water molecules
Ice crystals
Sulfuric acid is made of two hydrogen atoms (H), one sulfur atom (S), and four oxygen atoms (O). What is its molecular formula?
2H4SO
H4S2O
H2SO4
H2S2O4
What is the best synonym for the word "stoichiometry?"
combining atoms
balancing chemical equations
discovering new chemicals
breaking the chemical bonds that hold molecules together
The chemical symbol "Ni" most likely represents:
Carbon
Antimony
Lead
Nickel
What's the easiest way to balance a chemical equation?
Trial and error
Using the periodic table
Complex algebra
Calculus
The ______________ states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction.
law of conservation of mass
law of distribution
chemical equation law
reactant
a substance that is formed as the result of a chemical reaction
Product
Reactant
Starters
Enders
an atom or molecule which has gained or lost one or more of its valence electrons
Covalent Bond
Chemical Formula
Ion
Compound
a substance formed when two or more elements are chemically bonded together
Element Soup
Pure Element
Ion
Compound
a process or reaction in which the system absorbs energy from its surroundings; usually, but not always, in the form of heat
Endothermic Reaction
Exothermic Reaction
Diffusion
Fission
a chemical reaction that releases energy by light or heat
Endothermic Reaction
Exothermic Reaction
Diffusion
Fission
type of chemical reaction where an element reacts with a compound and takes the place of another element in that compound
Double Displacement
Single Displacement
Synthesis
Decomposition
type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products
Double Displacement
Single Displacement
Synthesis
Decomposition
type of reaction in which two or more elements combine to form a more complex compound
Double Displacement
Single Displacement
Synthesis
Decomposition
type of reaction in which a compound is broken down into its simple elements
Double Displacement
Single Displacement
Synthesis
Decomposition
A chemical change is different than a physical change because in a chemical change
chemicals are used
molecules do not physically touch
a new substance is formed and in a physical no new substance is formed
the change can be seen but in a physical change it cannot
Which of the following 2 are chemical reactions?
sugar dissolving in water
water turning into steam
burning wood
mixing baking soda and vinegar
tearing paper
How many Carbons are present on the reactant side?
1
2
3
4
How many Hydrogens are on the product side of this chemical equation?
1
2
3
4
How many Oxygens are on the product side of this chemical equation?
1
2
3
4
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.
Is this chemical equation balanced? Why or why not? Choose the BEST answer.
Yes, the amount of atoms for each element are equal on both the reactant and product side.
No, the carbons are not the same number on both the reactant and product side.
No, neither the carbons or hydrogens are the same amount on both the reactant and product side.
No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.
Which of the following is a common sign that a chemical change has occurred?
A chemical has turned a different color, bubbled, and/or changed temperature.
A chemical has changed to a different state of matter, such as a liquid to a solid.
A chemical has changed size.
A chemical has become a different shape.
The left side of the equation below is called
Products
Reactants
The right side of the equation below is called the
products
reactants
A chemical reaction that absorbs heat
Single replacement
Exothermic
Endothermic
Decomposition
Which of the following is NOT a sign of a chemical reaction?
Color changes
Cutting into fourths
Light is produced
Gas is formed
Which of the following is a chemical reaction?
Sodium and chlorine atoms bond to form salt molecules.
Ice melts to form water.
Carbon dioxide freezes to form dry ice.
Salt and water mix to form salt water
2H2 + O2 -> 2H2O
In the equation shown, what are the reactants?
Hydrogen atoms
Hydrogen and oxygen molecules
Water molecules
Ice crystals
Sulfuric acid is made of two hydrogen atoms (H), one sulfur atom (S), and four oxygen atoms (O). What is its molecular formula?
2H4SO
H4S2O
H2SO4
H2S2O4
What is the best synonym for the word "stoichiometry?"
combining atoms
balancing chemical equations
discovering new chemicals
breaking the chemical bonds that hold molecules together
The chemical symbol "Ni" most likely represents:
Carbon
Antimony
Lead
Nickel
What's the easiest way to balance a chemical equation?
Trial and error
Using the periodic table
Complex algebra
Calculus
a substance that is formed as the result of a chemical reaction
Product
Reactant
Starters
Enders
The law of conservation of mass says substances can neither be _______ nor ___________.
built; torn down
created; destroyed
blended together; separated
condensed; extracted
Sodium and chlorine combine to form sodium chloride, or table salt. Sodium and chlorine are:
reactants
producers
reactionaries
products
When sodium and chlorine combine to form sodium chloride, sodium chloride is the:
originator
product
reactant
produce
4 grams of hydrogen and 32 grams of oxygen will combine to form:
32
36
4
40
A solid substance appears within the solution, can be cloudy or a thickening as well is an example of _________________.
indicator change
gas formation
temperature change
precipitate formation
A chemical reaction that can NOT be reversed, you can not go back to the original materials is an example of _____________.
temperature change
irreversible
gas formation
precipitate formation
The law of conservation of mass says substances can neither be _______ nor ___________.
built; torn down
created; destroyed
blended together; separated
condensed; extracted
4 grams of hydrogen and 32 grams of oxygen will combine to form:
32
36
4
40
When sodium and chlorine combine to form sodium chloride, sodium chloride is the:
originator
product
reactant
produce
Sodium and chlorine combine to form sodium chloride, or table salt. Sodium and chlorine are:
reactants
producers
reactionaries
products
A chemical reaction that can NOT be reversed, you can not go back to the original materials is an example of _____________.
temperature change
irreversible
gas formation
precipitate formation
