Part 2 For 7th 1st Semester Question Preview (ID: 62574)

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.

a) exothermic reactions

b) endothermic reactions

c) composition reaction

d) gastrocnemius reaction

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.

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

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)

a) atoms are destroyed

b) atoms are rearranged

c)

d)

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

a) color change

b) change in odor

c) gas bubble formation

d) no change in temperature

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.

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.