Pre-AP Chemistry Midterm

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a type of mixture where the components are not uniformly distributed, and different parts of the mixture can be seen and separated easily.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout, meaning that the different components are not distinguishable and are evenly distributed.

Front

What is the Lewis Dot Structure?

Back

The Lewis Dot Structure is a diagram that represents the valence electrons of an atom, showing how they are arranged around the nucleus and how they bond with other atoms.

Front

What is the formula for cobalt (III) sulfide?

Back

The formula for cobalt (III) sulfide is Co2S3.

Front

Who discovered the electron?

Back

The electron was discovered by J.J. Thomson in 1897.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means and is made up of only one type of atom.

Front

What is a compound?

Back

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

Front

What is the difference between an element and a compound?

Back

An element consists of only one type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

Front

What is the significance of the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity and its position in the periodic table.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of elements organized by increasing atomic number, which shows the relationships between different elements.