Science test

Question 1

Product

Answer 1

end result

Question 2

reactants

Answer 2

Substances initially present in a chemical reaction that are consumed during the reaction to make products

Question 3

conserved

Answer 3

to keep the same

Question 4

mass

Answer 4

the weight of the atoms in a substance without the force of gravity

Question 5

• how to count reactant and product atoms in a chemical equation

Answer 5

-what “atoms are not created or destroyed” means Atoms are not CREATED or DESTROYED during a chemical reaction. Scientists know that there must be the SAME number of atoms on each SIDE of theEQUATION. To balance the chemical equation, you must add COEFFICIENTS infront of the chemical formulas in the equation. You cannot ADD or CHANGEsubscripts

Question 6

• what occurs in a chemical reaction

Answer 6

The molecules of one reactant are combined with those of another reactant to form a new substance during a chemical reaction. As the chemical bonds are broken, the positions of electrons change, resulting in a product with properties that are different from the properties of the reactants.

Question 7

• how to increase the products in a chemical reaction

Answer 7

reactions tend to speed up (a) when the reactants are heated, (b) presuming the reaction occurs in solution