4.5 Lesson Quiz

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1 point

A shorter, easier way to show a chemical reaction, using symbols instead of words, is called a

subscript.

chemical formula.

chemical equation.

symbol.

1 point

A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a

decomposition reaction.

replacement reaction.

synthesis reaction

precipitate reaction.

1 point

Chemical formulas are a combination of _________that represent the elements in a compound.

subscripts

coefficients

symbols

inhibitors

1 point

A ___________obeys the law of conservation of mass.

both open and closeed

closed system

open system

neither

1 point

In chemical reactions, what does the principle of conservation of mass mean?

Matter is not changed.

The total mass of the reactants is greater than the total mass of the products.

Matter is not created or destroyed.

The total mass of the reactants is less than the total mass of the products.

1 point

Which two processes could be considered opposites?

a synthesis reaction and a decomposition reaction

a decomposition reaction and a single replacement reaction

a single replacement reaction and a double replacement reaction

a precipitate reaction and a synthesis reaction

1 point

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.

1 point

What type of reaction is FeS + 2 HCl FeCl2 + H2S?

a single replacement reaction

a decomposition reaction

a synthesis reaction

a double replacement reaction

1 point

The substances listed on the left side of a chemical equation are the

products

coefficients.

precipitates.

reactants.

10.

1 point

The principle of conservation of mass is true

only for reactions that take place in closed system

only for reactions that take place in open systems.

for no reactions at all.

for reactions in both open and closed systems.

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