Chapter 8.1-8.4 Chemistry
A certain compound is analyzed and its empirical formula is found to be CH2. What piece of additional information is needed to determine the molecular formula?
The molecular mass
What is the relationship between empirical and molecular formula?
Molecular formula = n x Empirical formula
In the molecular formula CO2, the number 2 is called a_____.
Subscript
What is depicted in a chemical formula?
The number of each kind of atom in a molecule
For finding the empirical formula, conversion of grams to miles must be done for each element. True or false?
True
How does the number of protons compared to the number of electrons in a cation?
There are more protons than electrons.
The empirical formular for ionic compounds represents the simplest whole number ratio of the ions present. True or false?
True
True or false? A group of atoms can remain bound to each other which results in the formation of a molecule.
True
True or false? An atom is the smallest particle that takes part in a chemical reaction.
True
True or false? Atomicity is defined as the number of atoms present in a molecule.
True
True or false? Metal atoms tend to form cations, while nonmetal atoms tends to form anions.
True
True or false? The empirical formula for two different compounds can be the same.
True
True or false? The molecular formula for a given compound can be the same as its empirical formula.
True
True or false? The molecular formula of a compound can be determined from its empirical formula.
True
True or false? The molecular formula of a compound is the chemical formula which represents the true formula of its molecule.
True
True or false? When a neutral atom gains electrons, it becomes an anion.
True
The molecular mass of water is _____ grams per mol.
18
What is a cation?
An atom that has lost one or more electrons to become positively charged.
Who conducted many groundbreaking chemistry experiments and developed a systematic method for naming compounds?
Antione Lavoisier
When an atom loses an electron it forms a cation and its atomic radius ____.
Decreases
The ______ of a compound indicates the simplest whole number ratio of atoms present in the compound.
Empirical formula
The smallest whole number ratio of miles for each element is not necessary in finding the empirical formula. True or false?
False
True or false? A molecular formula gives structural information about a molecule.
False
True or false? An empirical formula calculated using experimental data will give the absolute number of atoms in a compound.
False
True or false? The chemical and physical properties of ions are the same as those of the elements from which they were formed?
False
True or false? The empirical formula denotes the exact number of atoms of each element present in a compound.
False
True or false? The empirical formula for a compound is the same as its structural formula.
False
True or false? The empirical formula of a chemical compound can be deduced from the knowledge of atomic radii of the elements.
False
True or false? The most common ion formed by silver is Ag2+.
False
True or false? The number "1" is used as a subscript in a molecular formula.
False
A halogen normally _____ electron(s) when forming an ion.
Gains one
An alkali metal normally _____ electron(s) when forming an ion.
Loses one
Cations can be formed by _____ electrons.
Losing
Two or more atoms that have been chemically combined are called a ____.
Molecule
An experiment demonstrates that a certain compound contains two parts sodium to every one part oxygen. What is the empirical formula of the compound?
Na2O
Metallic elements form _____ ions by losing electrons.
Positive
A positive ion is formed when the number of _____ are more than the number of electrons.
Protons
