8th Science Midterm Review

Front

How do most mountains form?

Back

Most mountains form when continents collide and fold up on each other.

Front

What is an Element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a Compound?

Back

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

Front

What is a Homogeneous Mixture?

Back

A homogeneous mixture is a mixture in which the composition is uniform throughout.

Front

What is a Heterogeneous Mixture?

Back

A heterogeneous mixture is a mixture in which the composition is not uniform throughout.

Front

Which substance is made up of the most atoms: Phosphoric acid, Nitric acid, Sulfuric acid, or Carbonic acid?

Back

Phosphoric acid is made up of the most atoms.

Front

What does the equation NaOH + HCl -> NaCl + H2O represent?

Back

This equation represents a neutralization reaction between an acid (HCl) and a base (NaOH) to form salt (NaCl) and water (H2O).

Front

What evidence shows that mass is conserved in a chemical reaction?

Back

The number of atoms of each element is the same in the reactants and products, indicating mass is conserved.

Front

What are the two outcomes of a massive star's life cycle after a supernova?

Back

A black hole and a neutron star.

Front

What is a Supernova?

Back

A supernova is a powerful and luminous explosion that occurs at the end of a massive star's life cycle.