OSE 7.1 Unit Assessment

Front

What are molecules made of?

Back

Atoms

Front

What makes one substance different from another substance? A) Its color and shape, B) The type of atoms it contains, C) The number, type, and arrangement of atoms in its molecules, D) Its temperature

Back

The number, type, and arrangement of atoms in its molecules.

Front

In a chemical reaction, what happens to the atoms in the reactants?

Back

They are rearranged to form new substances.

Front

Which statement is true about substances? A) All substances are made of the same type of atoms, B) A substance can be made of different types of molecules, C) A substance is made of the same type of molecules or atoms, D) Substances do not contain atoms

Back

A substance is made of the same type of molecules or atoms.

Front

What do scientists use molecular models for?

Back

To understand chemical reactions.

Front

What did Dalton's investigations help to understand? A) Gravity, B) The structure of atoms and molecules, C) Plant growth, D) The solar system

Back

The structure of atoms and molecules

Front

Which of the following is a result of a chemical reaction? A) Melting of ice, B) Formation of a new substance, C) Breaking of glass, D) Dissolving sugar in water

Back

Formation of a new substance

Front

What is true about atoms in a molecule? A) They are only from one element, B) They can be from different elements, C) They are not bonded together, D) They are always in a liquid state

Back

They can be from different elements.

Front

What happens to the particles in a chemical reaction?

Back

They are rearranged.

Front

Which statement best describes an atom? Options: A) The smallest unit of a compound, B) The smallest particle that retains the properties of an element, C) A type of molecule, D) A form of energy

Back

The smallest particle that retains the properties of an element