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WorksheetsCh.5 Chemical Reactoins
Total questions: 20
Worksheet time: 13mins
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
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 particles
A material used to decrease the rate of a chemical reaction is a(n)
inhibitor
catalyst
enzyme
fuel
CaCo3 represents a chemical
symbol
formula
subscript
reaction
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 --> 2NaO
Na2O + O2 --> 1 NaO
Na2 + O2 --> Na2O2
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 the 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
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a
synthesis reaction
decomposition reaction
replacement reaction
precipitate reaction
A precipitate is a(n) (a) that forms from solution during a chemical reaction
In a chemical equation, the substances written on the right side of the arrow are called (a)
The (a) is the minimum amount of energy that must be added to start chemical reaction
The (a) is the amount of one material present in a given volume of another material
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) (a) reaction.
Physical changes occur when existing bonds break and new bonds form.
True
False
The amount of matter in a chemical reaction changes.
False
True
Synthesis is the process of making a more complex compound from simpler substances
True
False
The rate of a chemical reaction is independent of temperature
True
False
A chemical reaction may be detected by observing changes in the properties of matter
True
False
