Balancing Equations And Counting Atoms: Question Preview (ID: 28860)


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How many atoms are of Hydrogen are in the following chemical formula? 3Mg(OH)2
a) 1
b) 2
c) 5
d) 6

Which coefficient will balance the following equation? Zn + HCl --- ___ZnCl2 + H2
a) 2
b) 3
c) 4
d) None of the above

The substances produced in a chemical reaction are called ____________.
a) Reactants
b) Products
c) Mixtures
d) Solutions

What does the arrow in a chemical equation mean?
a) yields
b) equals
c) mixes
d) matches

Determine the number of Oxygen atoms in the following chemical formula: Pb(NO3)2
a) 1
b) 3
c) 5
d) 6

Which of the following equations is balanced?
a) H2 + O2 --- H2O
b) 2H2 + O2 --- 2H2O
c) H2 + 2O2 --- 2H2O
d) 2H2 + O2 --- H2O

Which of the following describes the law of conservation?
a) Matter can be created or destroyed in certain chemical reactions.
b) Products = Reactants
c) Reactants + Products = 100%
d) Matter cannot be created or destroyed, but it can change form.

A chemical equation is balanced when the number of each type of __________ is the same on both sides.
a) Formula
b) Compound
c) Atom
d) Molecule

Which of the following can be changed to balance a chemical equation?
a) Coefficients
b) Subscripts
c) Element Symbols
d) Products

Which of the following is the general form of a chemical equation?
a) Products = Reactants
b) Products + Reactants = 100%
c) Products yield reactants
d) Reactants yield products

How many atoms of Oxygen are present in the following chemical formula: 2CO2
a) 1
b) 2
c) 4
d) 6

The substances that begin a chemical reaction are called _________.
a) Products
b) Reactants
c) Mixtures
d) Ingredients

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