Chemistry Test

A chemist observed bubbling and fizzing after adding an acid solution to a white powdery substance in a beaker. Which of the following can be assumed?

• The acid boiled when poured into the beaker.

• The acid and powder formed a new product.

• A physical reaction produced a gas mixture.

• A reaction occurred that produced heat.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is the BEST explanation of why heat is released when wood burns?

• Burning creates energy by stopping particle motion.

• Burning destroys matter and creates energy with it.

• Burning releases energy stored in chemical bonds.

• Burning causes convection currents which create heat energy.

Tags

NGSS.MS-PS1-4

What is needed to change ice into water?

• Change of state

• Change of color

• Temperature change

• Formation of a new substance

Tags

NGSS.MS-PS1-4

Sodium (Na) and chlorine (Cl) combine to form sodium chloride (NaCl). What is the common name for this compound?

• Soap

• Vinegar

• Baking Soda

• Table Salt

Which is a physical change?

• A piece of wood burning

• A copper roof reacting with oxygen

• Rust forming on an iron fence

• A piece of shredding paper

Which of the following shows one example of a physical change and one example of a chemical change?

• Boiling water and melting wax

• Dissolving powder and shredding

• Freezing water and burning coal

• Rust forming on an iron fence

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these is true about a physical change?

• A new substance is formed when it is complete.

• It is the result of 2 or more substances interacting.

• The number of atoms at the beginning is different than those at the end of the change.

• The substance does not change its identity

Tags

NGSS.MS-PS1-4

Which of the following statements is true?

• All chemical reactions are dangerous.

• All chemical reactions can be reversed.

• Chemical reactions only occur in the laboratory.

• All chemical reactions require energy.

Which best describes a solid produced in a solution during a chemical reaction?

• Acid

• Solute

• Reactant

• Precipitate

Which of the following represent a physical property?

• Oxidation

• Solubility

• Combustion

• Magnetism