Limiting Reactants and chemical equations

You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich.  If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?

• bread
• jelly
• peanut butter
• sandwich

1 P₄ + 3 O₂ --> 1 P₄O₆ 
What is the limiting reactant if 12 moles of P₄ react with 15 moles of O₂?

• P₄
• O₂
• P₄O₆ 
• none of the above

Tags

NGSS.HS-PS1-7

What is the limiting reactant if 10 moles of NH₃ react  with 30.0 moles of NO?
4 NH₃+6 NO --> 5 N₂ + 6 H₂O

• NH₃
• NO
• N₂
• water

Tags

NGSS.HS-PS1-7

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃.  If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

• AlCl3
• Cl2
• Al

Tags

NGSS.HS-PS1-7

The limiting reactant

• slows the reaction down
• is used up first
• is the reactant that is left over
• controls the speed of the reaction

What is the arrow in a chemical equation...
H_{2 +} O --> H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

The substances listed on the left side of a chemical equation are the

• Products
• Coefficients
• Precipitates
• Reactants

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In chemical reactions, what does the principle of conservation of mass mean?

• Mass is not created or destroyed (same amount of reactants as products)

• The total mass of the reactants is greater than the total mass of the products.

• The total mass of the reactants is less than the total mass of the products.

• Matter is not changed.

How many molecules of Carbon are in the following formula? 3C₂H₆

• 3

• 6

• 12

• 18

In the following equation, what are the products?

HCl + Zn → H₂ + ZnCl₂

• HCl + Zn

• H₂ + ZnCl₂

• Zn → H₂

• There are no products, everything shown above is a reactant.

• There are no reactants, everything shown above is a product.