Download CHEMICAL EQUATIONS NAME PERIOD_______ DATE________

CHEMICAL EQUATIONS
Atoms
Correct
Mass
Reactants
balanced
element
Mg (cr)
substance
chemical reaction
equation
numbers
two
NAME _______________________________
PERIOD_______
DATE________
coefficients
formula
products
yields
A ______________ is a well-defined example of a chemical change. A chemical ___________ can be used to show the changes that occur in a chemical
reaction. In a chemical equation, the substances on the left side of the arrow are the starting substances. These substances are called ______________. The
substances on the right side of the arrow are the substances that result from the reaction. These substances are called ____________________. The arrow is
read as either produces or ____________________.
According to the law of conservation of _____________________, atoms are neither lost nor gained during a chemical reaction. This law is illustrated when
a chemical equation is _______________________. When this is done, there will be the same number of ___________________ of each kind on both sides
of the equation.
In a chemical equation, the numbers that are placed in front of the symbols and the formulas are called ______________________. They are necessary to
keep the _____________________ of atoms in balance.
There are several rules for balancing an equation. First, write the correct ___________________ for each reactant and product. Next, choose the coefficients
that make the number of atoms of each ___________________________ on each side of the equation equal. The correctly written formula should not be
changed. If you change the formula of a substance, the equation is no longer _______________. Changing a formula will indicate a ___________________
different than the one intended.
To balance the equation Mg(cr) + O2(g)
MgO(cr), first choose coefficients to make the number of atoms of each element on each side of the equation
equal. You would need to place a coefficient of _________________ in front of the product MgO(cr). You would also need to place a coefficient of two in
front of the reactant _________________.
Balance this first!
2 NaOH + H2SO4  Na2SO4 + H2O
1.
List the elements in the equation _______________________________________________________.
2.
Name the reactants _____________________________________.
3.
Name the products _____________________________________.
4.
Circle the subscripts.
5.
Put a box around the coefficients.
6.
How many oxygen atoms are on the left side of this equation? ____________How many are on the right?_______________
7.
State the law of conservation of mass
____________________________________________________________________________________________________
____________________________________________________________________________________________________
8.
What information is in a chemical formula? _____________________________________________.
9.
What does a subscript tell you? ________________________________________.
10. What information can be obtained from a chemical equation?________________________________________________.
11. What does a coefficient tell? __________________________________________________________.
12. What does the arrow () mean in a chemical reaction? _____________________________________.