Chemical Concepts and Calculations

This video is a comprehensive review of MCAT General Chemistry, covering topics such as atomic structure, molecules, compounds, mixtures, the periodic table, chemical bonds, and stoichiometry. It includes detailed explanations, examples, and practice problems to help students understand and apply key chemistry concepts.

What is the charge of an ion with 13 protons and 10 electrons?

• Negative 3

• Positive 3

• Positive 1

• Neutral

Which of the following is a characteristic of transition metals?

• They form only one type of ion.

• They are always colorless in solution.

• They are non-reactive.

• They can form complex ions.

What type of bond involves the sharing of electrons between two atoms?

• Ionic bond

• Covalent bond

• Metallic bond

• Hydrogen bond

Which of the following elements is diatomic in its natural state?

• Carbon

• Nitrogen

• Helium

• Sodium

What is the density of a rock if its mass is 7.45 g and the volume change in water is 1.9 mL?

• 3.92 g/mL

• 5.92 g/mL

• 4.92 g/mL

• 2.92 g/mL

Which of the following is a molecular compound?

• MgCl2

• CaO

• NaCl

• SF6

What is the formula for phosphoric acid?

• H3PO3

• H3PO4

• H2SO4

• H2CO3

How many chloride ions are present in 4.3 moles of aluminum chloride?

• 7.74 x 10^24

• 2.58 x 10^24

• 1.29 x 10^24

• 5.16 x 10^24

What is the mass percent of carbon in methane (CH4)?

• 25%

• 50%

• 60%

• 75%

In a balanced reaction of propane with oxygen, what is the molar ratio of oxygen to carbon dioxide?

• 1:1

• 2:3

• 5:3

• 3:5