CHM 131 Chapter 1

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Questions and Answers

Define an atom and list its three subatomic particles?

An atom is the smallest particle of an element that retains the characteristic properties of that element. Its three subatomic particles are protons, electrons, and neutrons.

What is the atomic number and mass number of an atom?

The atomic number is the number of protons in the nucleus of an atom, while the mass number is the total number of protons and neutrons in the nucleus of an atom.

What is an isotope?

An isotope is a variant of a particular chemical element which differs in neutron number.

Define a compound and a molecule?

<p>A compound is a substance formed when two or more chemical elements are chemically bonded together. A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound.</p> Signup and view all the answers

What are the objectives of Chapter 1 in CHM 131?

<p>The objectives are to define elements, compounds, atoms, molecules, and ions, state the names or formulas of elements, molecules, and compounds, define proton number, nucleon number, and isotope, determine mole, relative atomic mass and relative molecular/formula mass, % composition, empirical formula, formula of compounds, limiting reactant, and perform balancing the chemical equations & chemical stoichiometry.</p> Signup and view all the answers