Chemistry S1 Exam 2024

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a combination of two or more substances that remain distinct and can be easily separated, such as water, salt, coral, and fish in the Pacific Ocean.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout, such as air.

Front

What is a valence electron?

Back

A valence electron is an electron in the outermost shell of an atom that can participate in forming chemical bonds.

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What safety measure should be taken for long hair in a laboratory?

Back

Long hair in the laboratory must be tied back or kept entirely out of the way with a hair band to prevent accidents.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is a substance formed when two or more elements chemically bond together.

Front

What is the definition of a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a solvent?

Back

A solvent is a substance that dissolves a solute, resulting in a solution, such as water in saltwater.

Front

What is a solute?

Back

A solute is a substance that is dissolved in a solvent, such as salt in saltwater.