Gen Chemistry Semester 1 Review

Front

Is glass breaking a chemical or physical change?

Back

Physical change

Front

What does the atomic mass of 1.00794 represent?

Back

Atomic mass of hydrogen

Front

Which of these is a compound: Aluminium (Al), Carbon Dioxide (CO2), Nitrogen (N), Sand?

Back

Carbon Dioxide (CO2)

Front

Why did Mendeleev leave blanks in his periodic table?

Back

Left room for elements not yet discovered

Front

How many protons does Copper (Cu) have?

Back

29

Front

What is the definition of a chemical change?

Back

A process where substances combine or break apart to form new substances.

Front

What is the definition of a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their atomic number and properties.

Front

What is a molecule?

Back

A group of two or more atoms bonded together.