Chemistry NCFE Released Questions

Front

Chlorine, Cl, belongs to the ______ family.

Back

Halogen

Front

A substance which has a high melting point, conducts electricity when dissolved in water, and has a crystalline structure probably has what type of bond?

Back

Ionic

Front

A neutral atom has a ground state electron configuration of 1s²2s²2p⁶3s². The neutral atom becomes an ion during a chemical reaction. Which is the most likely charge of the ion?

Back

2+

Front

A neutral atom of a certain element has the electron configuration 1s²2s²2p⁶3s²3p⁴. How many valence electrons does the atom have?

Back

6

Front

When Temperature of a gas increases, the Volume will ____________________

Back

Increase

Front

What is the definition of a Halogen?

Back

Halogens are a group of elements in Group 17 of the periodic table, known for their reactivity and tendency to form salts with metals.

Front

Define Ionic Bonding.

Back

Ionic bonding is the electrostatic attraction between oppositely charged ions, typically formed when electrons are transferred from one atom to another.

Front

What is the significance of valence electrons?

Back

Valence electrons determine an atom's chemical properties and its ability to bond with other atoms.

Front

Explain the relationship between temperature and volume in gases (Charles's Law).

Back

Charles's Law states that the volume of a gas is directly proportional to its temperature (in Kelvin) when pressure is held constant.

Front

What is the electron configuration for a neutral atom of Sodium (Na)?

Back

1s²2s²2p⁶3s¹