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Which of the following is NOT an indication that a chemical reaction took place?
Question 1 options:


Change in shape


New substance formed


Precipitate forms


Bubbles



Chemical reactions must be ___________ because...
Question 2 options:


Larger on the product side because new substances are produced


Not enough information


Smaller on the reactant side because the reactants are used up


Balanced because of the law of conservation of matter and energy


Question 3
Fill in the blank: The number of atoms of an element in a molecule are indicated by the ______.



Why are buffers important in living organisms?
Question 4 options:


Buffers kill bacteria and viruses


Buffers cause acids to break down food


Buffers make bases work more effectively


Buffers prevent pH changes in body systems



Ionic bonds occur between _______ and _______.
Question 5 options:


nonmetal and nonmetal


metal and nonmetal


metal and metal