Review Flashcards on Atoms, Elements, and Chemical Changes

Flashcards to review key concepts about atoms, elements, the periodic table, and physical/chemical changes.

What three subatomic particles make up an atom?

Protons, neutrons, and electrons

What is the definition of an element?

A pure substance made of only one type of atom.

What is used to represent elements internationally?

Internationally recognized symbols (e.g., H for hydrogen)

How does the periodic table organize elements?

By shared properties like reactivity and atomic number

What are the two main types of elements?

Metals and non-metals

Name four common properties of metals.

Lustrous, ability to conduct heat and electricity, malleable, and ductile

Describe the general properties of non-metals.

Usually dull, poor conductors, brittle, and not ductile or malleable

How has our understanding of elements changed over time?

Developed as technology has advanced, allowing us to discover more elements and learn about their properties.

What is a molecule?

Two or more atoms bonded together; they can be the same element or different.

What is a compound?

A molecule made of different types of atoms (elements).

Give examples of how elements and compounds have been used throughout history.

Tools, medicines, cooking, art, and technology across different cultures.

What is a physical change?

A change in shape or appearance that does not change the particles in a substance.

Are physical changes reversible?

Yes, physical changes are usually reversible (e.g., melting and freezing).

What is a chemical change?

A change that produces new substances with different properties.

Are chemical changes reversible?

No, chemical changes are usually irreversible.

What happens to atoms during a chemical reaction?

Atoms rearrange and form new bonds, making new substances.

How do scientists create and develop new products?

By making or discovering substances from natural resources.