Which of the following changes is chemical rather than physical? a. Water is boiled c.
Download ReportTranscript Which of the following changes is chemical rather than physical? a. Water is boiled c.
Slide 1
Which of the following changes is
chemical rather than physical?
a. Water is boiled
c. Glass is shattered
b. Aluminum foil is crumpled
d. Wood is burned
Slide 2
Each substance written to the right
of the arrow in a chemical
equation is a ______
a. Reactant
c. Precipitate
b. Product
d. Catalyst
Slide 3
When the following chemical
reaction is balanced, what number is
placed before NH3?
N2 + 3H2
__ NH3
a.
1
c.
3
b.
2
d.
4
Slide 4
A substance that speeds up
chemical reactions without
changing itself is a(n)
a. Inhibitor
c. Enzyme
b. Catalyst
d. Prohibitor
Slide 5
What type of reaction is
FeS + 2HCl
FeCl2 + H2S?
a. A Synthesis Reaction
b. A Decomposition Reaction
c. A Single-Replacement Reaction
d. A Double-Replacement Reaction
Slide 6
A chemical equation that shows the
same number and kind of atom on
both sides of the equation is said to
be
a. Balanced
b. Unbalanced
c. An incomplete reaction
d. A replacement reaction
Slide 7
Anything that has mass and takes
up space is considered
a. Matter
c. Chemistry
b. Energy
d. Endothermic
Slide 8
What happens when chemical
bonds break and new bonds form?
a. A physical change
b. A chemical reaction
c. Matter is destroyed
d. Surface area increases
Slide 9
CaCO3 represents a chemical
a. Symbol
c. Equation
b. Formula
d. Reaction
Slide 10
A shorter, easier way to show
chemical reactions, using symbols
instead of words, is called a
a. Chemical Equation
c.
Symbol
b. Chemical Formula
d.
Subscript
Slide 11
The substances listed on the left
side of a chemical equation are the
a. Products
c. Precipitates
b. Coefficients
d. Reactants
Slide 12
Which of the following is a
balanced chemical equation?
a. H2O2
H2 O + O 2
b. 2 Fe2O3 + 3C
c. SO2 + O2 + 2H2O
d. 2Mg + HCl
4Fe + 3CO2
4H2SO4
MgCl2 + H2
Slide 13
A chemical reaction that absorbs
energy in the form of heat is
described as
a. Endothermic
c. Combustion
b. Exothermic
d. Unbalanced
Slide 14
The minimum amount of energy
that has to be added to start a
reaction is the
a. Exothermic Reaction
c.
b. Endothermic Reaction
d. Chemical Energy
Activation Energy
Slide 15
A material used to decrease the
rate of a chemical reaction is a(n)
a. Inhibitor
c. Enzyme
b. Catalyst
d. Fuel
Slide 16
In a chemical equation, numbers
often appear in front of a chemical
formula. These numbers tell you the
a. Number of atoms in each molecule in the reaction
b. Number of elements in the reaction
c. Number of molecules or atoms of each substance in the reaction
d. Number of molecules in each atom in the reaction
Slide 17
Chemicals that act as biological
catalysts by speeding up reactions
in living things are
a. Inhibitors
c. Fuels
b. Enzymes
d. Reactants
Slide 18
The number placed below an
element’s symbol
a. Subscript
c. Reactant
b. Coefficient
d. Product
Slide 19
Which of the following chemical
equations is balanced?
a. 3Ca + O2
b. 3Ca + 2O2
c. Ca + 2O2
d. Ca + O2
3CaO2
5CaO2
2CaO2
CaO2
Slide 20
Which of the following is an
example of a chemical reaction?
a. Ice melting in a glass of water
b. Paper turning soft when wet
c. Salt crystals forming as sea water evaporates
d. Leaves changing colors in the fall
Slide 21
How many Carbon atoms are in
this glucose molecule?
C6H12O6
a.
3
c.
12
b.
6
d.
24
Slide 22
How many sodium (Na) ions are
in this molecule?
7Na3PO4
a.
3
c.
21
b.
7
d.
28
Slide 23
What occurs when water freezes?
a. A physical change
b. A chemical reaction
c. A chemical bond
d. A diatomic molecule
Slide 24
What is the force that holds atoms
together called?
a. A chemical solution
b. A chemical mixture
c. A chemical reaction
d. A chemical bond
Slide 25
Which is the product in this
chemical formula?
N + O2
NO2
a. N
c.
O2
b.
d.
NO2
O
Slide 26
Which of these uses coefficients
correctly to balance this equation?
N2 + H2
a. N2 + 3H2
b. 2N2 + 2H2
c. N2 + H2
d. 3N2 + 4H2
NH3
2NH3
4NH3
NH3
6NH3
Slide 27
Which of the following states the
law of conservation of mass?
a. Atoms are rearranged in a chemical reaction, and some join new molecules
b. Two compounds combine to form a new compound with different properties
c. Mass cannot be created nor destroyed in a chemical reaction
d. Energy is neither created nor destroyed in a chemical reaction
Slide 28
How many oxygen atoms are
present in the reactant in this
chemical equation?
4Fe + 3O2
2Fe2O3
a.
2
c.
4
b.
3
d.
6
Slide 29
Which of the following is an
example of a diatomic molecule
a. NaCl
c.
Mg
b. O2
d.
CaCl2
Slide 30
How many atoms are present in
the formula CaCO3?
a.
Three
c.
Five
b.
Four
d.
Six
Slide 31
If a chemical symbol in a chemical
formula has no subscript, it means
a.
The chemical symbol is written without any numbers
b.
The element has no charge
c.
d.
The chemical is listed last in the formula
Only one atom of the element is in the molecule
Slide 32
Which phrase describes what
happens to atoms in a chemical
reaction?
a. Sometimes lost, never rearranged
b. Sometimes lost, gained, or rearranged
c. Never lost or gained, just rearranged
d. Lost or gained, never rearranged
Slide 33
What must be done for a chemical
equation to be balanced?
a. All molecules must be counted
b. All chemicals must be equal
c. All atoms must be counted
d. All atoms must be discounted
Slide 34
Which of the following shows an
exothermic reaction?
a. 2Na + Cl2
2NaCl + energy
b. 2H2 + O2
2H2O
c. 2H2O + energy
d.
6CO2 + 6H2O + energy
2H2 + O2
C6H12O6 + 6O2
Slide 35
What happens in an endothermic
reaction?
a. Energy is destroyed
b. Energy is released
c. Energy is created
d. Energy is taken in
Slide 36
Which of the following chemical
reactions illustrates a
decomposition reaction?
a. 2H2O
b. 4H2 + O2
2H2 + O2
2H2O
c. 6CO2 + 6H2O + energy
d. 4KI + 2Cl
C6H12O6 + 6O2
4KCl + 2I2
Slide 37
Which of the following chemical
reactions illustrates a Synthesis
reaction?
a. 2H2O
b. 4H2 + O2
2H2 + O2
2H2O
c. 6CO2 + 6H2O + energy
d. 4KI + 2Cl
C6H12O6 + 6O2
4KCl + 2I2
Slide 38
Which of the following chemical
reactions illustrates a SingleReplacement reaction?
a. 2H2O
b. 4H2 + O2
2H2 + O2
2H2O
c. 6CO2 + 6H2O + energy
d. 4KI + 2Cl
C6H12O6 + 6O2
4KCl + 2I2
Slide 39
Which of the following chemical
reactions illustrates a Endothermic
reaction?
a. 2H2O
b. 4H2 + O2
2H2 + O2
2H2O
c. 6CO2 + 6H2O + energy
d. 4KI + 2Cl
C6H12O6 + 6O2
4KCl + 2I2
Which of the following changes is
chemical rather than physical?
a. Water is boiled
c. Glass is shattered
b. Aluminum foil is crumpled
d. Wood is burned
Slide 2
Each substance written to the right
of the arrow in a chemical
equation is a ______
a. Reactant
c. Precipitate
b. Product
d. Catalyst
Slide 3
When the following chemical
reaction is balanced, what number is
placed before NH3?
N2 + 3H2
__ NH3
a.
1
c.
3
b.
2
d.
4
Slide 4
A substance that speeds up
chemical reactions without
changing itself is a(n)
a. Inhibitor
c. Enzyme
b. Catalyst
d. Prohibitor
Slide 5
What type of reaction is
FeS + 2HCl
FeCl2 + H2S?
a. A Synthesis Reaction
b. A Decomposition Reaction
c. A Single-Replacement Reaction
d. A Double-Replacement Reaction
Slide 6
A chemical equation that shows the
same number and kind of atom on
both sides of the equation is said to
be
a. Balanced
b. Unbalanced
c. An incomplete reaction
d. A replacement reaction
Slide 7
Anything that has mass and takes
up space is considered
a. Matter
c. Chemistry
b. Energy
d. Endothermic
Slide 8
What happens when chemical
bonds break and new bonds form?
a. A physical change
b. A chemical reaction
c. Matter is destroyed
d. Surface area increases
Slide 9
CaCO3 represents a chemical
a. Symbol
c. Equation
b. Formula
d. Reaction
Slide 10
A shorter, easier way to show
chemical reactions, using symbols
instead of words, is called a
a. Chemical Equation
c.
Symbol
b. Chemical Formula
d.
Subscript
Slide 11
The substances listed on the left
side of a chemical equation are the
a. Products
c. Precipitates
b. Coefficients
d. Reactants
Slide 12
Which of the following is a
balanced chemical equation?
a. H2O2
H2 O + O 2
b. 2 Fe2O3 + 3C
c. SO2 + O2 + 2H2O
d. 2Mg + HCl
4Fe + 3CO2
4H2SO4
MgCl2 + H2
Slide 13
A chemical reaction that absorbs
energy in the form of heat is
described as
a. Endothermic
c. Combustion
b. Exothermic
d. Unbalanced
Slide 14
The minimum amount of energy
that has to be added to start a
reaction is the
a. Exothermic Reaction
c.
b. Endothermic Reaction
d. Chemical Energy
Activation Energy
Slide 15
A material used to decrease the
rate of a chemical reaction is a(n)
a. Inhibitor
c. Enzyme
b. Catalyst
d. Fuel
Slide 16
In a chemical equation, numbers
often appear in front of a chemical
formula. These numbers tell you the
a. Number of atoms in each molecule in the reaction
b. Number of elements in the reaction
c. Number of molecules or atoms of each substance in the reaction
d. Number of molecules in each atom in the reaction
Slide 17
Chemicals that act as biological
catalysts by speeding up reactions
in living things are
a. Inhibitors
c. Fuels
b. Enzymes
d. Reactants
Slide 18
The number placed below an
element’s symbol
a. Subscript
c. Reactant
b. Coefficient
d. Product
Slide 19
Which of the following chemical
equations is balanced?
a. 3Ca + O2
b. 3Ca + 2O2
c. Ca + 2O2
d. Ca + O2
3CaO2
5CaO2
2CaO2
CaO2
Slide 20
Which of the following is an
example of a chemical reaction?
a. Ice melting in a glass of water
b. Paper turning soft when wet
c. Salt crystals forming as sea water evaporates
d. Leaves changing colors in the fall
Slide 21
How many Carbon atoms are in
this glucose molecule?
C6H12O6
a.
3
c.
12
b.
6
d.
24
Slide 22
How many sodium (Na) ions are
in this molecule?
7Na3PO4
a.
3
c.
21
b.
7
d.
28
Slide 23
What occurs when water freezes?
a. A physical change
b. A chemical reaction
c. A chemical bond
d. A diatomic molecule
Slide 24
What is the force that holds atoms
together called?
a. A chemical solution
b. A chemical mixture
c. A chemical reaction
d. A chemical bond
Slide 25
Which is the product in this
chemical formula?
N + O2
NO2
a. N
c.
O2
b.
d.
NO2
O
Slide 26
Which of these uses coefficients
correctly to balance this equation?
N2 + H2
a. N2 + 3H2
b. 2N2 + 2H2
c. N2 + H2
d. 3N2 + 4H2
NH3
2NH3
4NH3
NH3
6NH3
Slide 27
Which of the following states the
law of conservation of mass?
a. Atoms are rearranged in a chemical reaction, and some join new molecules
b. Two compounds combine to form a new compound with different properties
c. Mass cannot be created nor destroyed in a chemical reaction
d. Energy is neither created nor destroyed in a chemical reaction
Slide 28
How many oxygen atoms are
present in the reactant in this
chemical equation?
4Fe + 3O2
2Fe2O3
a.
2
c.
4
b.
3
d.
6
Slide 29
Which of the following is an
example of a diatomic molecule
a. NaCl
c.
Mg
b. O2
d.
CaCl2
Slide 30
How many atoms are present in
the formula CaCO3?
a.
Three
c.
Five
b.
Four
d.
Six
Slide 31
If a chemical symbol in a chemical
formula has no subscript, it means
a.
The chemical symbol is written without any numbers
b.
The element has no charge
c.
d.
The chemical is listed last in the formula
Only one atom of the element is in the molecule
Slide 32
Which phrase describes what
happens to atoms in a chemical
reaction?
a. Sometimes lost, never rearranged
b. Sometimes lost, gained, or rearranged
c. Never lost or gained, just rearranged
d. Lost or gained, never rearranged
Slide 33
What must be done for a chemical
equation to be balanced?
a. All molecules must be counted
b. All chemicals must be equal
c. All atoms must be counted
d. All atoms must be discounted
Slide 34
Which of the following shows an
exothermic reaction?
a. 2Na + Cl2
2NaCl + energy
b. 2H2 + O2
2H2O
c. 2H2O + energy
d.
6CO2 + 6H2O + energy
2H2 + O2
C6H12O6 + 6O2
Slide 35
What happens in an endothermic
reaction?
a. Energy is destroyed
b. Energy is released
c. Energy is created
d. Energy is taken in
Slide 36
Which of the following chemical
reactions illustrates a
decomposition reaction?
a. 2H2O
b. 4H2 + O2
2H2 + O2
2H2O
c. 6CO2 + 6H2O + energy
d. 4KI + 2Cl
C6H12O6 + 6O2
4KCl + 2I2
Slide 37
Which of the following chemical
reactions illustrates a Synthesis
reaction?
a. 2H2O
b. 4H2 + O2
2H2 + O2
2H2O
c. 6CO2 + 6H2O + energy
d. 4KI + 2Cl
C6H12O6 + 6O2
4KCl + 2I2
Slide 38
Which of the following chemical
reactions illustrates a SingleReplacement reaction?
a. 2H2O
b. 4H2 + O2
2H2 + O2
2H2O
c. 6CO2 + 6H2O + energy
d. 4KI + 2Cl
C6H12O6 + 6O2
4KCl + 2I2
Slide 39
Which of the following chemical
reactions illustrates a Endothermic
reaction?
a. 2H2O
b. 4H2 + O2
2H2 + O2
2H2O
c. 6CO2 + 6H2O + energy
d. 4KI + 2Cl
C6H12O6 + 6O2
4KCl + 2I2