Part 2 For 7th 1st Semester Question Preview (ID: 62574)
Chemical Reaction Continued.
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Which of the following is NOT a sign of chemical reaction?
a) color change
b) change in odor
c) gas bubble formation
d) no change in temperature
What is an element?
a) a single adam
b) a group of rearranged atoms
c) a substance that cannot be broken down into simpler substances by chemical means.
d) a substance that can be broken down into simpler substances by chemical means.
What happens to particles as heat is added to them?
a) as temperature increases, the spaces between the molecules decreases
b) as temperature increases, the spaces between the molecules increases
c) as temperature decreases matter evaporates
d) as temperature decreases, the spaces between the molecules increases.
What is a Periodic table of Elements?
a) a limitation on the possible solutions to a design problem.
b) the requirements that must be met for an engineering solution
c) the table that lists all the elements and groups them into columns by important properties
d) a shorthand notation of one, two or three letters that represent the name of an element
What happens during a chemical reaction
a) atoms are destroyed
b) atoms are rearranged
c)
d)
What does the Law of Conservation of Matter state?
a) The scientific law states that all matter can be created.
b) The scientific law states that the number of atoms before and after a chemical reaction will always remain the same
c) the scientific law states that matter can be destroyed through a chemical reaction
d) The scientific law states that the type of atoms before and after a reaction can be changed if they go through a change
what is a chemical reaction
a) when atoms of a substance get rearranged to form a new substance
b) states the total mass before a chemical reaction is the same as the total mass after the chemical reaction
c) the minimum amount of energy needed to start a chemical reaction.
d)
what kind of chemical reactions give off thermal energy
a) exothermic reactions
b) endothermic reactions
c) composition reaction
d) gastrocnemius reaction
What is a molecular equation?
a) an unbalanced chemical equation in which the ionic compounds are stated as molecules rather than component ions
b) a balanced chemical equation in which the ionic compounds are stated as molecules rather that component ions.
c) molecules that are stacked together to build something new
d) molecules that are multiplied and divided to get their result.
what is a catalyst?
a) a substance that decreases the rate of a chemical reaction
b) a substance that doesn't do anything to a chemical reaction
c) a substance that increases the rate of a chemical reaction
d) a boy ban with justin timberlake as the lead singer.
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