Which of the following represents the correct electron configuration for chlorine (Cl)?

• A. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^6 5s^2
• B. 1s^2 2s^2 2p^6 3s^2 3p^5
• C. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1
• D. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^5

Tags

NGSS.HS-PS1-1

What is the name of the compound with the formula PCl5?

• A. Phosphorus chloride
• B. Phosphorus pentachloride
• C. Phosphorus chlorate
• D.Phosphorus pentoxide

• A
• B
• C
• D

An element has two isotopes with masses of 10 amu and 11 amu. If their abundances are 70% and 30%, respectively, what is the average atomic mass?

• A. 10.1 amu
• B. 10.3 amu
• C. 10.5 amu
• D. 10.7 amu

Henry, David, and Ethan are having a debate about chemistry. They are stuck on a question and need your help. Can you tell them what is the intermolecular force in NH3?

• dipole-dipole
• london dispersion force
• hydrogen bonding
• ionic bond

What is the electron dot structure for oxygen (O)?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-1

Imagine Lily, Benjamin, and Aiden are playing a game of 'Guess the Element' in their chemistry class. Lily picks an element and gives a clue: 'My element is essential for life and its atomic number is the same as the number of legs on an octopus.' What is the atomic number of Lily's element?

• 32
• 16
• 4
• 8

What are oxyacids?

• Acids that contain oxygen atom(s)
• Acids that do not contain oxygen atom(s)
• Acids that are only found in living organisms
• Acids that are only found in rocks and minerals

Which of the following statements is true about ionic compounds?

• They are formed by the transfer of electrons between atoms.
• They consist of hydroxide ions held together by electrostatic forces.
• They involve the sharing of electrons between atoms.
• It has two types (polar and nonpolar)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

NGSS.HS-PS1-3

What did the Bohr model assume about the motion of electrons?

• All electrons move in a circular orbit around the nucleus.
• Electrons do not have a specific path around the nucleus.
• All electrons move in a single cloud layer around the nucleus.
• Electrons always remain in the same location around a nucleus.