Physical Science NCFE Review

Front

What is the formula for the compound formed by potassium (K) and nitrogen (N)?

Back

K₃N

Front

How do you calculate the mass number of an atom?

Back

Mass number = Number of protons + Number of neutrons.

Front

What is the mass number of an atom with 29 protons and 35 neutrons?

Back

64

Front

Which element is the most chemically reactive among beryllium (Be), calcium (Ca), strontium (Sr), and radium (Ra)?

Back

Radium (Ra) is the most chemically reactive.

Front

What happens to electrons in an ionic bond?

Back

Electrons are transferred from one element to another.

Front

How many HCl molecules are needed to balance the equation: Mg + __HCl → MgCl₂ + H₂?

Back

2 HCl molecules are needed.

Front

What is an ionic bond?

Back

An ionic bond is a chemical bond formed through the transfer of electrons from one atom to another.

Front

Define mass number.

Back

Mass number is the total number of protons and neutrons in an atom's nucleus.

Front

What is the charge of a potassium ion (K+)?

Back

The charge of a potassium ion (K+) is +1.

Front

What is the charge of a nitrogen ion (N³⁻)?

Back

The charge of a nitrogen ion (N³⁻) is -3.