Unit 1-6 Review

Front

What is Dalton's atomic theory?

Back

Dalton's atomic theory states that all elements are composed of atoms, atoms of the same element are identical, and atoms combine in simple whole-number ratios to form compounds.

Front

Which statement is NOT part of Dalton's atomic theory?

Back

Atoms are always in motion.

Front

What is a pure substance that is a compound?

Back

A pure substance formed when two or more elements chemically combine in fixed proportions.

Front

What is a mixture?

Back

A combination of two or more substances that can be separated by physical means.

Front

Can a mixture be separated?

Back

Yes, mixtures can be separated into their components.

Front

What is the first step in a scientific experiment?

Back

The first step is to identify a question or problem.

Front

What did Mendeleev's periodic table leave blank spaces for?

Back

Undiscovered elements that were not yet known.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a compound?

Back

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

Front

What is the difference between a pure substance and a mixture?

Back

A pure substance has a uniform and definite composition, while a mixture contains two or more substances that retain their individual properties.