Elements Compounds and Mixtures Flashcard 2024

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties. Examples include air and salad.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include oxygen (O) and carbon (C).

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together. Examples include water (H2O) and sodium chloride (NaCl).

Front

What is the difference between a homogeneous mixture and a heterogeneous mixture?

Back

A homogeneous mixture has a uniform composition throughout (e.g., salt water), while a heterogeneous mixture has a non-uniform composition (e.g., salad).

Front

What is a scientific law?

Back

A scientific law is a statement that describes what scientists expect to happen every time under a particular set of conditions, based on repeated experimental observations.

Front

What is a scientific theory?

Back

A scientific theory is a well-substantiated explanation of an aspect of the natural world that is based on a body of evidence and can be tested.

Front

What are constants in an experiment?

Back

Constants are the parts of an experiment that must be kept the same to ensure that the results are valid.

Front

What is an independent variable?

Back

An independent variable is the factor that is changed or manipulated in an experiment to test its effects.

Front

What is a dependent variable?

Back

A dependent variable is the factor that is measured or observed in an experiment, which is affected by changes in the independent variable.