question The compound Al O is commonly known as

Chemistry

The compound Al₂O₃ is commonly known as:

A. Aluminum oxide
B. Aluminum hydroxide
C. Aluminum chloride
D. Aluminum nitrate

Al₂O₃ is commonly known as aluminum oxide.

In the Bohr model, what is the significance of the principal quantum number (n)?

A. Energy level
B. Orbital shape
C. Spin
D. Magnetic quantum number

What is the modern quantum mechanical model based on?

A. Wave functions
B. Planetary orbits
C. Particle paths
D. Circular motion

What is the product of the reaction between nitric acid (HNO₃) and potassium hydroxide (KOH)?

A. Potassium nitrate and water
B. Nitrogen gas and oxygen gas
C. Potassium hydroxide and water
D. Potassium nitrite and water

Which of the following elements is a noble gas used in lighting?

A. Neon
B. Nitrogen
C. Nickel
D. Natrium

What is the IUPAC name for CH₃CH₂CH₂COOH?

A. Butanoic acid
B. Ethanoic acid
C. Propanoic acid
D. Pentanoic acid

What is the term for the time required for half of a radioactive substance to decay?

A. Half-life
B. Decay constant
C. Radiometric time
D. Nuclear stability

What is the general formula for alkenes?

A. CnH₂n+2
B. CnH2n
C. CnH2n-2
D. CnHn

What is the mass number of an atom?

A. Sum of protons and electrons
B. Number of neutrons
C. Number of protons
D. Sum of protons and neutrons

The compound CO is commonly known as:

A. Carbon oxide
B. Carbon monoxide
C. Carbon dioxide
D. Calcium oxide

The chemical formula for table salt is:

A. NaCl
B. Na₂SO₄
C. NaNO₃
D. NaHCO₃