Chapter 14, Section 2: Chemical Formulas and Equations

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About how many elements make up all known substances?

100

How many oxygen atoms are contained in the formula 2H2O?

2

Nitrogen dioxide is a covalent compound. How many oxygen atoms are in a nitrogen dioxide molecule?

2

The symbol for iron is Fe. The chemical symbol for oxygen is O. The formula for iron oxide is Fe2+O3. How many iron atoms are in one molecule of iron oxide?

2

How many oxygen atoms are present in the reactant side of the chemical equation 4Fe+3O2 ->2Fe2 O3

6

What does a chemical formula show?

A chemical formula shows how many atoms of each molecule of each kind are present in a molecule.

The overall charge of an ionic compound is:

Zero

What will happen if the wrong chemical symbol or formula is used in a chemical equation?

It will wrongly describe the reaction that is occurring.

Antoine Lavoisier's work led to the __________________________________.

Law of Conservation of Mass

Which of the following states the law of conservation of mass?

Mass cannot be created or destroyed in a chemical reaction

What does the law of conservation of mass state?

Mass cannot be created or destroyed in ordinary chemical and/or physical changes

magnesium chloride

MgCl

Which of the following uses coefficients correctly to balance the equation N2+H2 ->NH3

N2+3H2 ->2NH3

The formula for dinitrogen monoxide is:

N2O

Which of the following is the product in the chemical equation N+O2 ->NO2?

NO2

sodium chloride:

NaCl

Ionic compounds are composed of a(n) ___________________and a(n) ______________________.

metal; nonmetal

Covalent compounds are usually composed of two __________________.

nonmetals

A substance that forms in a chemical reaction is called a(n):

product

When carbon and oxygen react to form carbon dioxide, the carbon dioxide is the:

product

A substance or molecule that participates in a chemical reaction is called a(n):

reactant

What is the charge of an ionic compound?

zero

What is the chemical formula for glucose?

C6H12O6

The formula for carbon dioxide is:

CO2

A calcium carbonate molecule has 1 calcium (Ca) atom, 3 oxygen (O) atoms, and 1 carbon (C) atom. Which of the following shows the chemical formula for calcium carbonate?

CaCO3

What is the chemical formula for water?

H2O

What is the chemical formula for oxygen?

O2

What do musical notations and chemical equations have in common?

They both use symbols to communicate info in ways that are easy to understand by people who can read those symbols, no matter what language they speak.

A chemical equation must show the same numbers and kinds of ____________ on both sides of the arrow.

atoms

In a chemical reaction, ___________ are never gained or lost.

atoms

The subscript in the chemical formula H2O tells you there are two

atoms of hydrogen in the molecule

When chemical symbols and formulas are used as a shortcut to describe a chemical reaction, It is called a(n):

chemical equation

A combination of chemical symbols and numbers that represent a substance is called a(n)

chemical formula

The number placed in front of a chemical symbol or formula is called a(n):

coefficient

When balancing an equation, only ______________________ are changed, not _______________________.

coefficients; subscripts


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