Chemistry Fall Review 2024

Front

What is a noble gas?

Back

Noble gases are a group of chemical elements that are odorless, colorless, monatomic gases with very low chemical reactivity. They include helium, neon, argon, krypton, xenon, and radon.

Front

Which of the following is not a noble gas: Helium, Radon, Iodine, Krypton?

Back

Iodine is not a noble gas.

Front

What is the chemical formula for potassium nitrate?

Back

The chemical formula for potassium nitrate is KNO3.

Front

What is the proper formula for magnesium hydroxide?

Back

The proper formula for magnesium hydroxide is Mg(OH)2.

Front

How do you balance the equation SnO2 + H2 --> Sn + H2O?

Back

The balanced equation is 1 SnO2 + 2 H2 --> 1 Sn + 2 H2O.

Front

How do you balance the equation Al + HCl --> H2 + AlCl3?

Back

The balanced equation is 2 Al + 6 HCl --> 3 H2 + 2 AlCl3.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations is important because it ensures that the law of conservation of mass is followed, meaning that the number of atoms of each element is the same on both sides of the equation.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds are formed when electrons are transferred from one atom to another, resulting in charged ions. Covalent bonds are formed when two atoms share electrons.

Front

What is the pH scale?

Back

The pH scale measures the acidity or basicity of a solution, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water is approximately 18.02 g/mol.