Chemical Reactions Review

Which is an example of a balanced chemical equation?

• 3KClO₃ → 2KCl + 3O₂

• 2KClO₃ → 2KCl + 3O₂

• 2KClO₃ → 2KCl + O₂

• 2KClO₃ → KCl + 3O₂

Tags

NGSS.MS-PS1-5

A(n) __ chemical equation has the same number of atoms of each element on both sides of the equation.

• oxidized

• reduced

• balanced

• conserved

Tags

NGSS.MS-PS1-5

Input a coefficient in front of each chemical formula to balance the equation: Fe + O₂ → Fe₂O_3. ________ Fe + ________ O₂ → ________ Fe₂O₃.

• 4 Fe + 3 O₂ → 2 Fe₂O₃

• 2 Fe + 1 O₂ → 1 Fe₂O₃

• 3 Fe + 2 O₂ → 2 Fe₂O₃

• 1 Fe + 1 O₂ → 1 Fe₂O₃

Tags

NGSS.MS-PS1-5

What does the symbol (s) represent in the following chemical equation? Sr (s) + 2H₂O(l) → Sr(OH)₂ (aq) + H₂ (g)

• solid

• liquid

• gas

• aqueous

What does the symbol (l) represent in the following chemical equation? Sr (s) + 2H₂O(l) → Sr(OH)₂ (aq) + H₂ (g)

• liquid

• gas

• solid

• aqueous

What does the symbol (aq) represent in the following chemical equation? Sr (s) + 2H₂O(l) → Sr(OH)₂ (aq) + H₂ (g)

• aqueous (dissolved in water)

• solid state

• gaseous state

• precipitate

What does the symbol (g) represent in the following chemical equation? Sr (s) + 2H₂O(l) → Sr(OH)₂ (aq) + H₂ (g)

• gas

• liquid

• solid

• aqueous

In chemical equations, ________________ represent the number of units of each substance taking part in the chemical reaction.

• coefficients

• subscripts

• reactants

• products

Tags

NGSS.MS-PS1-1

A chemical equation is balanced when:

• the number of atoms of each element is the same on both sides of the equation.

• the reactants and products are written in alphabetical order.

• the equation contains only gases.

• the equation has more products than reactants.

Tags

NGSS.MS-PS1-5

__ uses chemical formulas and symbols to describe a chemical reaction.

• The law of conservation of mass

• A chemical equation

• A chemical law

• Synthesis