Law of Conservation of Mass

Law of Conservation of Mass

In today's lesson you will learn about chemical equations.

​Today, we are going to start off with an experiment!

The supplies that are needed are in the image below.

What type of chemical reaction do you think I can make with these ingredients? Endothermic or Exothermic?

​Time To experiment!!!

If something goes wrong, I need a volunteer to teach the rest of the class for me.

Reactants

Acetic Acid = Vinegar

Sodium Bicarbonate = Baking Soda

Products

Sodium Acetate = Crystalized Salt

​What is a chemical reaction?

During a chemical reaction, the atoms get rearranged to form something new.

When looking at chemical equations, we need to make sure that we do not delete any atoms from existence!

​What do you notice while looking at the image to the right?

Multiple Select

Which of the following occur during a chemical reaction?

Select 2 out of the 4.

• Atoms are rearranged

• At least one new substance is formed

• New matter is created

• Some energy is destroyed

When you need to do a math problem, you will often write an equation. A math equation is a model that represents how numbers interact in a problem.

Equations can be simple, like the ones shown here, or they can be long and complex. However, all math equations have one thing in common. Math equations have the same value on either side of the equal sign.

​In a previous lesson, you learned how atoms of elements form bonds. Now, you will learn how scientists use chemical equations as models to represent the chemical reactions that form and break bonds. In this lesson, you will learn about:

• chemical reactions

• the law of conservation of mass

• chemical equations

During a chemical reaction, a chemical change occurs. Chemical changes rearrange atoms to form a new substance. During a chemical reaction, the atoms that already exist within a system are rearranged. No new atoms enter the system, and no atoms leave the system.

​Law of Conservation of Mass

Recall that a scientific law is something in nature that scientists notice always seems to be true. A scientific law, like a scientific theory, is supported by a great many observations. One scientific law that always seems to be true is the law of conservation of mass.

The law of conservation of mass states that matter cannot be created or destroyed. Recall that matter is anything that has mass and takes up space. The amount of matter in a system stays constant during a chemical change.

Multiple Choice

Sometimes mass is created during a chemical reaction.

• True

• False

​We will need to balance chemical equations to show that matter has not been created nor destroyed.

Let's take a few minutes to try to practice this idea.

On the next slide, there is a simulation where you can see if you have what it takes to be the balancing chemical equations king or queen!!

After that, I have a video on the following slide that will hopefully clear up any and all confusion!

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