Exploring Chemical Equations

This video tutorial by Mrs. H covers the basics of chemical reactions and equations. It explains the concepts of reactants and products, and how chemical reactions result in new substances with different properties. The tutorial also details how to write and balance chemical equations, emphasizing the importance of the law of conservation of mass. Through examples, it demonstrates the use of coefficients to balance equations, ensuring the number of atoms on both sides of the equation is equal.

What do we call the substances we start with in a chemical reaction?

• Catalysts

• Reactants

• Products

• Enzymes

Tags

NGSS.MS-PS1-1

In a chemical equation, what does the arrow symbol (→) represent?

• Equals

• Yields

• Subtraction

• Addition

Which of the following is an example of a word equation?

• Na + Cl → NaCl

• Magnesium + Oxygen → Magnesium Oxide

• C + O2 → CO2

• H2 + O2 → H2O

What is the chemical formula for water?

• H2O

• O2

• H2

• HO2

Tags

NGSS.MS-PS1-1

What does the law of conservation of mass state?

• Matter cannot be created or destroyed.

• Matter can be created or destroyed.

• Energy can be created or destroyed.

• Energy cannot be created or destroyed.

Tags

NGSS.MS-PS1-5

Why do we balance chemical equations?

• To change the reactants into products.

• To make the equation look neat.

• To create new elements.

• To ensure the same number of atoms of each element on both sides.

Tags

NGSS.MS-PS1-5

What is the coefficient in a chemical equation?

• The type of chemical bond.

• The number of molecules of a substance.

• The number of atoms in a molecule.

• The state of matter.

In the equation 2H2 + O2 → 2H2O, what is the coefficient of H2O?

• 4

• 3

• 2

• 1

Tags

NGSS.MS-PS1-5

Which of the following is a balanced chemical equation?

• 2H2 + 2O2 → 2H2O

• H2 + 2O2 → H2O

• 2H2 + O2 → 2H2O

• H2 + O2 → H2O

Tags

NGSS.MS-PS1-5

What happens if a chemical equation is not balanced?

• The reaction will not occur.

• The equation will be incorrect.

• The products will be different.

• The reactants will disappear.

Tags

NGSS.MS-PS1-5