1st Semester Exam prep

Front

What happens to the motion of water molecules when water changes from steam to liquid?

Back

The molecules move slower and occupy less space.

Front

What type of matter can be separated by physical means?

Back

Mixture.

Front

What is the law of conservation of mass in a chemical reaction?

Back

The total mass remains the same.

Front

What does the chemical formula CO2 represent?

Back

It requires six molecules of CO2 as reactants.

Front

How can you identify an atom with 7 protons, neutrons, and electrons?

Back

Reference the periodic table to find the element with an atomic number of 7.

Front

What is a mixture?

Back

A combination of two or more substances that can be separated by physical means.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded.

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 chemical reaction?

Back

A process where substances (reactants) are transformed into different substances (products).