Chemical Equations Quiz

What are the reactants in the chemical equation: H₂ + O₂ -> H₂O?

• H₂O and H₂

• H₂ and O₂

• H₂ and H₂O

• H₂O and O₂

What is the coefficient needed to balance the chemical equation: 2H₂ + O₂ -> ​ (a)   H₂O?

• 1
• 3
• 2

Label the products and reactants.

a

b

Reactants

Products

O₂ has a Coefficient of 7,

which means that it has 7 molecules of O₂ and it doubles the number of O (7x2) _.

Show the all the Coefficient of O.

O₂ has a subscript of 2,

which means that it is made of 2 atoms of O and it can me multiplied by the coefficient (7x2) _.

Show all the subscripts of O.

_{They are not always shown id less then 2.}

What is the coefficient (number to multiply by) of H₂ in the chemical equation: 2H₂ + O₂ -> 2H₂O?

• 3

• 1

• 4

• 2

What is the subscript of O in the chemical equation: 2H₂ + O₂ -> 2H₂O?

• 4

• 3

• 1

• 2

What is the coefficient O₂ in the chemical equation: 2H₂ + O₂ -> 2H₂O?
_{Not always seen is less then 2.}

• 2

• 1

• 3

• 4

What is the subscript of H in the chemical equation: 2H₂ + O₂ -> 2_H2O_?

• 3

• 2

• 1

• 4

What are the reactants in the chemical equation: Na + Cl₂ -> NaCl?

• Na and Cl₃

• Na and Cl

• Na and Cl₂

• NaCl₂ and Cl