Physical Science Semester Test Dec 2023

Front

What type of chemical reaction is represented by the equation Al(OH)3 → Al2O3 + H2O?

Back

Decomposition

Front

What is the purpose of goggles in a laboratory setting?

Back

Goggles protect eyes from chemical or biological splatters and spills.

Front

What instrument is used to make tiny things look larger?

Back

Microscope

Front

What are negatively charged particles that orbit around the nucleus of an atom?

Back

Electrons

Front

True or False: Alloys are created to improve the working properties and appearance of metals by combining two or more elements.

Back

True

Front

What is the definition of a chemical reaction?

Back

A process that involves the rearrangement of the molecular or ionic structure of a substance.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it is conserved.

Front

What is an example of a synthesis reaction?

Back

A + B → AB, where two or more reactants combine to form a single product.

Front

What is the role of protons in an atom?

Back

Protons are positively charged particles found in the nucleus of an atom and determine the atomic number.