Chemical Compounds and Ions

This video tutorial covers the basics of chemistry, focusing on elements, compounds, and chemical reactions. It introduces the periodic table, explains the concept of ions and their charges, and provides guidance on balancing chemical equations. The tutorial also includes practice questions and recommends additional resources for further learning.

What is an element?

• A substance made of only one type of atom

• A substance made of different types of atoms

• A combination of molecules

• A mixture of compounds

Which of the following is NOT one of the first 20 elements?

• Hydrogen

• Helium

• Gold

• Boron

What distinguishes a compound from a mixture?

• Compounds are physically combined, mixtures are chemically combined

• Compounds are chemically combined, mixtures are physically combined

• Compounds and mixtures are both chemically combined

• Compounds and mixtures are both physically combined

What are the two types of compounds?

• Ionic and metallic

• Covalent and ionic

• Metallic and covalent

• Ionic and non-ionic

What is an ion?

• An atom or molecule that has gained or lost atoms

• An atom or molecule that has gained or lost neutrons

• An atom or molecule that has gained or lost electrons

• An atom or molecule that has gained or lost protons

Which of the following is a positive ion?

• OH-

• F-

• Na+

• Cl-

Which of the following is a polyatomic ion?

• F-

• NO3-

• Cl-

• Na+

What is the charge of a sulfate ion?

• 1+

• 2-

• 2+

• 1-

What is necessary for a chemical equation to be balanced?

• Equal number of molecules on each side

• Equal number of atoms on each side

• Equal number of compounds on each side

• Equal number of ions on each side

Which of the following is a tip for balancing chemical equations?

• Start with the most complex molecule

• Balance hydrogen atoms first

• Balance oxygen atoms first

• Ignore polyatomic ions