key concepts chemical reactions

Question 1

More detailed obeservations

Answer 1

provide stronger evidence

Question 2

things that are too small or too large to see can be studied with what

Answer 2

models

Question 2

Different substance have different what

Answer 2

properties

Question 3

Substance have different properties because they have

Answer 3

are made of different groups of atoms. These groups vary in the type of number of atoms that make up the group

Question 4

Groups of atoms do what to make a substance

Answer 4

repeat

Question 5

During a chemical reaction atoms don not what

Answer 5

change from one type to another

Question 5

During a chemical reaction one or more starting substances(reacantants) make what

Answer 5

One or more different substances(products)

Question 6

during a chemical reaction atoms rearrange to do what

Answer 6

to form different groups of atoms

Question 6

during a chemical reaction, all of the atoms that make up the reactants do what

Answer 6

rearrange to form the products

Question 7

atoms cannot be what

Answer 7

destroyed and created