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WorksheetsCh 15 Quiz Review
Total questions: 30
Worksheet time: 24mins
Chemistry is
a characteristic of a substance that can be observed without changing the substance into another substance.
the study of matter and how matter changes
anything that has mass and takes up space.
a rapid reaction between oxygen and a substance called a fuel.
Alchemy
The only sure evidence for a chemical reaction is
the formation of a gas.
a color change.
the production of one or more new substances
changes in properties.
formation of flobberworms
A material used to decrease the rate of a chemical reaction is a(n)
inhibitor.
catalyst.
enzyme.
fuel.
Aparecium
CaCO3 represents a chemical
symbol
formula.
subscript.
reaction.
Muggles
Which is the correct chemical equation for the following statement?
Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide
4 Na + O2 2 → Na2O
2 Na + O2 → 2 NaO
Na2O + O2 →2 NaO
Na2 + O2 →Na2O2
CoFe2 → CoFe + CuP
The principle of conservation of mass is true
only for reactions that take place in open systems.
only for reactions that take place in closed systems.
for reactions in both open and closed systems.
for no reactions at all.
In chemical reactions, what does the principle of conservation of mass mean?
Matter is not created or destroyed.
The total mass of the reactants is greater than the total mass of the products.
The total mass of the reactants is less than the total mass of the products.
Matter is not changed.
Chemicals that act as biological catalysts by speeding up reactions in living things are called
inhibitors.
enzymes.
fuels.
reactants.
Which of the following is an example of how to supply activation energy to begin a reaction?
Cool the reaction flask in an ice bath.
Add a catalyst.
Heat the reaction flask on a hot plate.
Add an inhibitor.
bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of
synthesis reaction.
decomposition reaction
replacement reaction.
precipitate reaction.
A precipitate is a(n) ________ that forms from solution during a chemical reaction.
replacement
activation energy
products
solid
In a chemical equation, the substances written on the right side of the arrow are called ________.
replacement
activation energy
products
solid
The _______ is the minimum amount of energy that must be added to start a chemical reaction.
Subscript
replacement
products
activation energy
The _________ is the amount of one material present in a given volume of another material.
products
concentration
solid
activation energy
A reaction in which one element replaces another in a compound or in which two elements in different compounds trade places is called a(n) ________ reaction
concentration
products
solid
replacement
Physical changes occur when existing bonds break and new bonds form.
True
False
All of the above
None of the above
The amount of matter in a chemical reaction changes.
True
False
All of the above
None of the above
Synthesis is the process of making a more complex compound from simpler substances.
True
False
All of the above
None of the above
The rate of a chemical reaction is independent of temperature.
True
False
All of the above
None of the above
A chemical reaction may be detected by observing changes in the properties of matter.
True
False
All of the above
None of the above
What does the Law of Conservation of Mass state?
Matter cannot be gained or lost in a chemical reaction.
Matter can only be lost in a chemical reaction.
Matter can only be gained in a chemical reaction.
Matter can be gained and lost in a chemical reaction.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
Reactants
Products
Yields
Chemical Equation
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
Reactants
Products
Yields
Chemical Equation
What is the total number of atoms present in 5Na3PO4
5
40
55
8
What is the little number after an element in a chemical equation called.
Example: H2
Coefficient
Subscript
Atom
Equation
How many elements are in C6H12O6?
24
6
3
12
What is the number before a chemical formula called?
Ex: 2H2 + O2 --> 2H2O
Coefficient
Subscript
Atom
Equation
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
H3PO4
H2SO4
HClO3
H2O
How many atoms are in the neurotransmitter serotonin? The formula for serotonin is C10H12N2O
10
20
25
23
Is the following equation balanced?...
Al + O2 --> 2Al2O3
True
False
all of the above
Not enough information is given
