CHEMISTRY Fall 2024

Front

What is the atomic number of carbon?

Back

6

Front

Define a homogeneous mixture.

Back

A homogeneous mixture is a mixture in which the composition is uniform throughout, such as salt dissolved in water.

Front

What is a chemical change?

Back

A chemical change is a process where new substances are formed, such as rusting iron.

Front

What is the chemical formula for ammonia?

Back

NH₃

Front

How many atoms of oxygen are in H₃PO₄?

Back

4

Front

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

Back

A chemical change results in new substances, while a physical change does not change the substance's chemical identity.

Front

What is the definition of a compound?

Back

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

Front

What is the pH scale?

Back

The pH scale measures how acidic or basic a solution is, ranging from 0 (acidic) to 14 (basic), with 7 being neutral.

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 an example of a physical change?

Back

Melting ice is an example of a physical change.