Exploring the Conservation of Mass Principles

The video tutorial covers the law of conservation of mass, explaining that mass cannot be created or destroyed but only converted. It provides several examples to illustrate this concept, including a log and fire reaction, a sulfur and iron reaction, and others. The tutorial demonstrates how to calculate unknown masses in chemical reactions to ensure the mass of reactants equals the mass of products, thus obeying the conservation of mass.

What does the law of conservation of mass state?

• Mass can be created and destroyed.

• Mass can only be destroyed.

• Mass can only be created.

• Mass can neither be created nor destroyed.

Tags

NGSS.MS-PS1-5

In the first example, what are the reactants?

• Fire and smoke

• Log and ashes

• Log and fire

• Ashes and smoke

Tags

NGSS.MS-PS1-2

What is the total mass of the reactants in the first example?

• 28 kilograms

• 29 kilograms

• 31 kilograms

• 30 kilograms

Tags

NGSS.MS-PS1-5

In the second example, what is the mass of the unknown reactant if the total mass of the products is 88 grams and one reactant is 56 grams?

• 32 grams

• 56 grams

• 88 grams

• 44 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the total mass of the products in the second example?

• 56 grams

• 44 grams

• 88 grams

• 32 grams

Tags

NGSS.MS-PS1-5

In the third example, if the total mass of the reactants is 50 grams, what is the mass of the product?

• 20 grams

• 30 grams

• 40 grams

• 50 grams

Tags

NGSS.MS-PS1-5

What is the total mass of the reactants in the third example?

• 20 grams

• 30 grams

• 40 grams

• 50 grams

Tags

NGSS.MS-PS1-5

In the final example, what is the mass of the unknown product if the total mass of the reactants is 80 grams and one product is 44 grams?

• 36 grams

• 44 grams

• 80 grams

• 64 grams

Tags

NGSS.MS-PS1-5

What is the total mass of the reactants in the final example?

• 16 grams

• 64 grams

• 80 grams

• 44 grams

Tags

NGSS.MS-PS1-5

What is the key principle of the conservation of mass demonstrated in all examples?

• Mass of reactants is equal to mass of products.

• Mass of reactants is less than mass of products.

• Mass of products is always greater than mass of reactants.

• Mass of reactants is always greater than mass of products.

Tags

NGSS.MS-PS1-5