Select all the statements that accurately describe chemical reactions: question 2 options: the number of atoms decreases when a compound is formed there is the same amount of matter before and after the reaction the atoms are arranged into different compounds or molecules after the reaction the substances in the reaction only undergo a physical change there are the same types and numbers of atoms before and after the reaction

There is the same amount of matter before and after the reaction

The atoms are arranged in different compounds and molecules.

There are the same types and number of atoms before and after the reaction

Explanation:

--The same amount of matter before and after the reaction and the same types and number of atoms before and after the reaction is because of the law of conservation of mass. Matter cannot be created or destroyed.

--the reacting atoms and molecules will undergo a transformation to different molecules and compounds. Can be predicted because of the types of chemical reactions:

combination (combining 2 elements to create a new compound)

Decomposition (a compound breaking down into different parts)

Single and Double displacement (the molecules/ atoms will change who they are paired with)

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer