What makes up a substance?

What is the difference between how the helium particle is molded and how the water particle is molded?

Explain why water particles differ from iron particles.

Aiden is studying chemistry and wants to know how the elements in a Substance can be represented.

• A chemical formula

• A chemical equation

• A molecular structure

Compare between these concepts: Atom-substance-molecules. State whether these are molecules or atoms or compounds.

Mention three substance properties.

Mia is studying chemistry and needs to write two examples for each of: compound and element.

Noah is studying chemistry and wants to understand the basic building blocks of matter. What is the primary component of a chemical formula?

• Atoms

• Molecules

• Ions

What is the significance of the coefficients in a chemical equation?

• They indicate the number of molecules involved

• They represent the energy changes during the reaction

• They show the physical state of the substances

What role do subscripts play in a chemical formula?

• They indicate the number of atoms of each element

• They show the charge of the ions

• They represent the state of matter

What particles make up the nucleus of an atom?

• Protons and neutrons

• Electrons and neutrons

• Protons and electrons