Bundle 3 Chemical Reactions
Knowledge Check 2
YOU CAN USE YOUR PERIODIC TABLE
1. Which of the following elements is an
alkali metal?
a. Calcium
b. Magnesium
c. Mercury
d. Sodium
2. Carbon and other nonmetals are found
in which area of the periodic table?
a. On the left side
b. On the right side
c. In the middle of the periodic
table
d. In the bottom rows
3. The symbol Au stands for what
element?
a. Gold
b. Silver
c. Copper
d. Tin
4. What is the atomic number for helium?
a. 1
b. 2
c. 4
d. 8
5. How many neutrons does an atom of
carbon have?
a. 12
b. 6
c. 3
d. 2
6. What is the symbol for Argon?
a. Au
b. Ag
c. A
d. Ar
7. The element rubidium is in which
element group?
a. Alkaline Earth Metal
b. Basic Metal
c. Alkali Metal
d. Transition Metal
8. What is the atomic number for Cesium?
a. 20
b. 48
c. 6
d. 55
9. A student is using the following key to
model the chemical equation provided.
Element
Color of Bead
Magnesium (Mg)
Black
Chlorine (Cl)
Blue
Sodium (Na)
White
Fluorine (F)
Green
Chemical Equation
MgCl2 + 2NaF → MgF2 + 2NaCl
The reactants are on the left and the products
are on the right.
How many blue beads will the student need to
model each side of the equation?
a. 1 for the products and 1 for the
reactants
b. 2 for the products and 2 for the
reactants
c. 2 for the products and 1 for the
reactants.
d. 1 for the products and 2 for the
reactants.
a.
10. Students want to gather evidence for the
claim that the number of atoms present before a
chemical reaction is equal to the number of
atoms present after the chemical reaction. They
decide to react vinegar and baking soda in a
sealed plastic bag. Which of the following would
provide the evidence the students need?
a. The mass of the plastic bag, baking
soda and vinegar before the reaction
was equal to the mass after the
reaction.
b. Bubbles were produced during the
reaction which meant that a gas was
being produced.
c. The plastic bag did not change in any
way, indicating that it was not involved
in the reaction.
d. The mass of the baking soda was
exactly equal to the mass of the vinegar
used to create the chemical reaction.
b.
c.
d.
13. Which of the following atomic models of
chemical reactions correctly demonstrates the
Law of Conservation of Matter?
a.
b.
c.
11. Which of the following is true regarding the
atoms involved in a chemical reaction?
a. The same number of each type of atom
will always be present before and after a
chemical reaction takes place.
b. Some of the atoms present before the
reaction will always be lost during a
chemical reaction.
c. Some of the atoms will always be
changed into a different type of atom by
a chemical reaction.
d. During a chemical reaction, atoms will
always be combined into much larger
molecules.
12.
In a chemical reaction known as decomposition,
carbonic acid breaks down into water, and what
other compound?
d.
14. Baking soda and vinegar put into separate
paper cups and placed in a plastic bag which is
sealed. The mass of total reactants was 8
grams. The mass of the total products was 8
grams. What type of system is this?
A. Closed
B. Open
15. A Seltzer tablet was placed into a flask. The
total mass of the reactants was 10 grams. The
total mass of the product was 7 grams. Was this
an open or closed system?
A. Open
B. Closed