Intro to Stoichiometry video

What is stoichiometry primarily used for in chemistry?

• To study biological cells

• To measure and balance chemical reactions

• To predict the weather

• To develop computer algorithms

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NGSS.HS-PS1-7

In the analogy of musical chairs, what represents the limiting reactant?

• The circle

• The walking speed

• The number of chairs

• The music

What must be done first when performing stoichiometric calculations?

• Calculate the final product

• Balance the chemical equation

• Measure the reactants

• Predict the reaction outcome

Tags

NGSS.HS-PS1-7

What does a balanced chemical equation provide in stoichiometric calculations?

• The temperature of the reaction

• The mole ratios of reactants and products

• The color of the chemicals

• The types of chemical bonds

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NGSS.HS-PS1-7

How is the expected amount of product calculated in stoichiometry?

• Using the balanced equation and mole ratios

• By measuring the reactants only

• By estimating the reaction time

• By guessing the outcome

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NGSS.HS-PS1-7

What is the limiting reactant in a chemical reaction?

• The substance that is completely used up first

• The substance in excess

• The fastest reacting substance

• The catalyst

How is percent yield calculated in stoichiometry?

• Actual yield divided by theoretical yield multiplied by 100

• Difference between reactants and products

• Theoretical yield divided by actual yield multiplied by 100

• Sum of reactants divided by products

Tags

NGSS.HS-PS1-7

What does STP stand for in the context of gases?

• Standard Testing Procedure

• Significant Theoretical Points

• Standard Temperature and Pressure

• Simple Theoretical Proposition

During a titration, what indicates that the equivalence point has been reached?

• The reactants are heated

• The solution changes color

• The volume of the solution doubles

• All reactants turn solid

What is the purpose of using a titration in chemistry?

• To observe color changes in reactions

• To determine the concentration of a solution

• To heat substances

• To mix different chemicals

Tags

NGSS.HS-PS1-5