Balancing Chemical Equations with Unit Cubes

The video tutorial explains the basics of chemical reactions, emphasizing the law of conservation of matter, which states that matter cannot be created or destroyed. It provides a detailed guide on balancing chemical equations, illustrating the process with examples. The tutorial highlights the importance of ensuring that the number of atoms for each element is the same on both sides of the equation, using visual aids and color coding to simplify the concept.

What is the term used for substances that enter a chemical reaction?

• Products

• Reactants

• Catalysts

• Inhibitors

According to the law of conservation of matter, what happens to matter during a chemical reaction?

• It changes into energy

• It is neither created nor destroyed

• It is destroyed

• It is created

Tags

NGSS.MS-PS1-5

What does the arrow in a chemical equation represent?

• The direction of the reaction

• The amount of reactants

• The amount of products

• The temperature of the reaction

In the equation H2 + O2 -> H2O2, what does H2 represent?

• One oxygen atom

• Two hydrogen atoms

• Two oxygen atoms

• One hydrogen atom

Tags

NGSS.MS-PS1-1

When balancing the equation C + O2 -> CO2, what is the correct coefficient for O2?

• 4

• 3

• 2

• 1

Tags

NGSS.MS-PS1-5

In the equation Na + Cl2 -> NaCl, what is the correct coefficient for NaCl to balance the equation?

• 3

• 1

• 4

• 2

Tags

NGSS.MS-PS1-5

What is the correct coefficient for Na in the equation 4Na + O2 -> 2Na2O?

• 3

• 4

• 1

• 2

Tags

NGSS.MS-PS1-5

In the equation N2 + 3H2 -> 2NH3, what is the correct coefficient for H2?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

What is the first step in balancing a complex chemical equation?

• Add coefficients randomly

• Remove atoms

• Start with the least flexible atoms

• Start with the most flexible atoms

Tags

NGSS.MS-PS1-5

When balancing equations, why is it important to start with atoms that appear in only one reactant and one product?

• They do not affect the balance

• They are the hardest to balance

• They are the easiest to balance

• They can be ignored