PoCP Exam Review

Front

What is an alkali metal?

Back

Alkali metals are a group of elements in Group 1 of the periodic table, characterized by having one electron in their outermost shell. They are highly reactive and include elements like lithium, sodium, and potassium.

Front

How many neutrons are in an atom of Nitrogen-16?

Back

An atom of Nitrogen-16 has 9 neutrons. The number of neutrons can be found by subtracting the atomic number (7 for nitrogen) from the mass number (16).

Front

What is true about the liquid state of matter?

Back

The liquid state has a definite volume but an indefinite shape, meaning it takes the shape of its container. The particles in a liquid can move past each other, allowing liquids to flow.

Front

What is H2?

Back

H2 is a molecule consisting of two hydrogen atoms bonded together. It is classified as an element because it is made up of only one type of atom.

Front

What does the line segment A-B represent in a phase diagram?

Back

The line segment A-B represents the solid state of matter, indicating conditions under which a substance exists as a solid.

Front

What is the atomic number of Sodium?

Back

The atomic number of Sodium (Na) is 11, which means it has 11 protons in its nucleus.

Front

What is the definition of a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together, such as water (H2O) or carbon dioxide (CO2).

Front

What is the difference between an element and a mixture?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a mixture is a combination of two or more substances that retain their individual properties.

Front

What is the significance of neutrons in an atom?

Back

Neutrons contribute to the mass of an atom and help stabilize the nucleus. The number of neutrons can vary in isotopes of the same element.

Front

What is the definition of a solid state of matter?

Back

The solid state of matter has a definite shape and volume, with particles that are closely packed together and vibrate in fixed positions.