Chemical Equations - Brainpop

Which of the following is a chemical reaction?

• Sodium and chlorine atoms bond to form salt molecules.

• Ice melts to form water.

• Carbon dioxide freezes to form dry ice.

• Salt and water mix to form salt water.

2H₂ + O₂ --> 2H₂0

In the equation shown, what are the reactants?

• Hydrogen atoms

• Hydrogen and oxygen molecules.

• Water molecules

• Ice crystals

Sulfuric acid is made of two hydrogen atoms (H₂), one sulfur atom (S), and four oxygen atoms (O). What is the molecular formula?

• 2H₄SO

• H₄S₂O

• H₂SO₄

• H₂S₂O₄

What is the best synonym for the word "stoichimetry"?

• Combining atoms

• Balancing chemical equations

• Discovering new chemical formulas

• Breaking the chemical bonds that hold molecules together

The chemical symbol "Ni" most likely represents:

• Carbon

• Antimony

• Lead

• Nickel

How do the products of chemical reactions compare to their reactants?

• The products usually weigh more than the reactants.

• The products often have completely different properties from the reactants.

• The products usually have more atoms than the reactants.

• The products are usually more toxic than the reactants.

H₂ + O₂ --> H₂O

What is the problem with the chemical equation shown?

• There is a missing hydrogen in the reactants.

• There is a missing oxygen in the product.

• There is an additional oxygen in the product.

• There is an additional hydrogen in the reactants.

What is the easiest way to balance a chemical equation?

• Trial and error

• Using the periodic table

• Complex algebra

• Calculus

X + PO₄ --> H₃PO₄

What reactant is missing from the equation shown?

• One hydrogen atom

• One phosphorus atom

• Three hydrogen atoms

• One oxygen atom

2Na + S₂O₃ -->

What is the product of the equation shown?

• NaS₂O₃

• NaS₄O₃

• Na₂S₂O₅

• Na₂S₂O₃