Bacola 22/23 6.5 Matter(Atoms, Elements, Molecules, Compounds)

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means. Examples include Hydrogen (H), Oxygen (O), and Carbon (C).

Front

What is a compound?

Back

A substance formed when two or more different elements are chemically bonded together. Example: Water (H2O) is a compound made of Hydrogen and Oxygen.

Front

What is a molecule?

Back

A group of two or more atoms bonded together, which can be of the same or different elements. Example: O2 (oxygen gas) is a molecule of two oxygen atoms.

Front

How many elements are in the compound C2H8O?

Back

3 (Carbon, Hydrogen, and Oxygen).

Front

Which of the following is neither a compound nor a molecule? Helium (He), Hydrogen Peroxide (H2O2), Chalk (CaCO3), Sand (SiO2)

Back

Helium (He) is an element.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus of an atom.

Front

If Sodium has an atomic number of 11 and a mass number of 23, how many neutrons does it have?

Back

12 neutrons (Mass number - Atomic number = 23 - 11 = 12).

Front

What is the definition of a molecule?

Back

2 or more atoms of the same element or different elements that are joined together.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.