What is the smallest unit of matter that retains the properties of an element?

Atom Molecule Compound Mixture

Two or more atoms chemically bonded together form a:

Molecule Element Mixture Ion

Which of the following is an element?

Water Salt Oxygen Sugar

What is a compound?

A physical blend of substances A substance made of two or more elements chemically combined A single type of atom An element that cannot be broken down

Which of the following is a compound?

Water (H₂O) Oxygen (O₂) Helium (He) Gold (Au)

What is a mixture?

A physical combination of two or more substances A single pure substance A chemically bonded compound A type of molecule

Which of the following is a mixture?

Air Water Carbon dioxide Salt

What is matter?

Anything that has mass and takes up space Anything that gives off light Anything without weight Only solids and liquids

Which subatomic particles are found in the nucleus of an atom?

Protons and neutrons Electrons only Neutrons and electrons Protons and electrons

What particle has a negative charge?

Electron Proton Neutron Nucleus

What is a pure substance made of only one type of atom?

Element Compound Mixture Molecule

Which subatomic particle determines the element’s identity?

Proton Electron Neutron Molecule

When two elements combine chemically, what is formed?

Compound Mixture Solution Element

What type of mixture has uniform composition throughout?

Homogeneous mixture Heterogeneous mixture Compound Element

A salad is an example of which type of mixture?

Heterogeneous mixture Homogeneous mixture Compound Element

Which of these can be separated by physical means?

Mixture Compound Molecule Element

The smallest particle of a compound that still has the properties of that compound is a:

Molecule Atom Element Mixture

Which of these is a heterogeneous mixture?

Trail mix Saltwater Air Vinegar

What is the center of an atom called?

Nucleus Electron cloud Shell Core

What particle moves around the nucleus in energy levels?

Electron Proton Neutron Ion

Which of these describes a solution?

A homogeneous mixture where one substance dissolves in another A pure element A solid compound A heterogeneous mixture

Which of these represents a chemical change?

Rust forming on iron Water freezing Cutting paper Melting wax

What is the combination of symbols and numbers representing a compound called?

Chemical formula Atomic number Molecular mass Periodic table

Which term describes substances that cannot be broken down chemically?

Elements Mixtures Compounds Molecules

Which statement best describes a compound compared to its elements?

A compound has properties different from the elements it contains A compound has identical properties to its elements A compound can be separated by filtering A compound is always a gas