Grade 8 Science Georgia Milestones Review

What can compounds be broken down into by chemical reactions?

• Elements.

• Mixtures.

• Compounds.

• Solutions.

What is a homogeneous mixture?

• A mixture that has a uniform composition throughout.

• A mixture that contains different substances that are easily distinguishable.

• A mixture that has varying properties in different parts.

• A mixture that cannot be separated by physical means.

What is a physical change?

• A change that affects one or more physical properties of a substance without altering its chemical composition.

• A change that alters the chemical composition of a substance.

• A change that occurs only at high temperatures.

• A change that affects the color of a substance without changing its state.

What happens to the density of a substance as the temperature changes?

• It remains constant.

• It increases with temperature.

• It decreases with temperature.

• It changes.

Define a compound.

• A substance formed when two or more elements are chemically bonded together.

• A mixture of two or more substances that retain their individual properties.

• A single element that cannot be broken down into simpler substances.

• A solution where one substance is dissolved in another.

What is a mixture?

• A combination of two or more substances that are not chemically bonded.

• A single substance with uniform composition.

• A chemical reaction between two or more elements.

• A solution where one substance is dissolved in another.

What is the smallest unit of an element?

• An atom.

• A molecule.

• A compound.

• An ion.

What is density?

• The mass of a substance divided by its volume.

• The weight of a substance divided by its volume.

• The volume of a substance divided by its mass.

• The mass of a substance multiplied by its volume.

What is the main difference between elements and compounds?

• Compounds can be broken down into simpler substances by chemical reactions, while elements cannot.

• Elements can be broken down into simpler substances by chemical reactions, while compounds cannot.

• Both elements and compounds can be broken down into simpler substances by chemical reactions.

• Elements and compounds are the same and cannot be broken down.

What is an element in the context of matter?

• A substance that can be broken down into simpler substances.

• A fundamental building block of matter that cannot be broken down into simpler substances.

• A mixture of two or more substances.

• A type of compound formed by chemical reactions.