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Balancing Equations And Counting Atoms
Test Description: Chemistry
Instructions: Answer all questions to get your test result.
1) The substances that begin a chemical reaction are called _________.
A
Reactants
B
Mixtures
C
Ingredients
D
Products
2) How many atoms of Oxygen are present in the following chemical formula: 2CO2
A
1
B
6
C
2
D
4
3) Which of the following is the general form of a chemical equation?
A
Products yield reactants
B
Products = Reactants
C
Reactants yield products
D
Products + Reactants = 100%
4) Which of the following can be changed to balance a chemical equation?
A
Subscripts
B
Coefficients
C
Products
D
Element Symbols
5) A chemical equation is balanced when the number of each type of __________ is the same on both sides.
A
Formula
B
Atom
C
Compound
D
Molecule
6) Which of the following equations is balanced?
A
H2 + O2 --- H2O
B
2H2 + O2 --- H2O
C
H2 + 2O2 --- 2H2O
D
2H2 + O2 --- 2H2O
7) Which of the following describes the law of conservation?
A
Matter can be created or destroyed in certain chemical reactions.
B
Matter cannot be created or destroyed, but it can change form.
C
Reactants + Products = 100%
D
Products = Reactants
8) Determine the number of Oxygen atoms in the following chemical formula: Pb(NO3)2
A
1
B
5
C
3
D
6
9) What does the arrow in a chemical equation mean?
A
matches
B
yields
C
equals
D
mixes
10) Which coefficient will balance the following equation? Zn + HCl --- ___ZnCl2 + H2
A
3
B
4
C
None of the above
D
2
11) The substances produced in a chemical reaction are called ____________.
A
Products
B
Mixtures
C
Reactants
D
Solutions
12) How many atoms are of Hydrogen are in the following chemical formula? 3Mg(OH)2
A
5
B
6
C
1
D
2
*select an answer for all questions
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