CANDLE LABWarm Ups, etc

Students of different ages were given the same puzzle to assemble. The puzzle assembly time was measured.

Independent Variable

IV =

Dependent Variable

DV =

Controlled Variable(s)

CV =

Two groups of students were tested to compare their speed working math problems. Each group was given the same problems. One group used calculators and the other group worked the problems without calculators.

Independent Variable

IV =

Dependent Variable

DV =

Controlled Variable(s)

CV =

And now to the Candle Lab…

So what are our variables?

Independent Variable

IV =

Dependent Variable

DV =

Controlled Variable(s)

CV =

So what do we need to do/figure out?

So what do we need to do/figure out?Objective 1:To determine the EXACT VOLUME of each beaker. 

So what do we need to do/figure out?Objective 1:To determine the EXACT VOLUME of each beaker. Objective 2:To determine the relationship between BEAKER VOLUME and CANDLE BURN TIME. 

So what do we need to do/figure out?Objective 1:To determine the EXACT VOLUME of each beaker. Objective 2:To determine the relationship between BEAKER VOLUME and CANDLE BURN TIME. Objective 3: Graph the relationship between VOLUME and BURN TIME.PREDICT burn time for volumes not directly tested.

Make a prediction

PREDICTION A:

How long do you think the candle will burn in the fish tank? ______ Seconds/Minutes/Hours/Days/Weeks/Months PREDICTION B: (For MASTERY you must work this out!)

How long do you think the candle would burn in the room? ______ Seconds/Minutes/Hours/Days/Weeks/Months

Describe the chemical reaction of a burning candle. (Hint: use chemical equation to help you)

2 C18H38 + 55 O2 36 CO2 + 38 H2O 

Explain why putting a jar over a candle causes the flame to go out.

  

BACKGROUND INFORMATION:

Going back to our knowledge of Chemical Reactions, think about how the amount of reactant might affect the rate of the reaction. Or in this case, how would the total amount of reactant available affect the total length of the reaction?

If the amount of reactant increases, the length of the reaction will ______________________. Or in the case of the candle, more ______________________ should result in a ______________________ burn time.

Exit TicketAn experiment was performed to determine how the amount of coffee grounds could affect the taste of the coffee. The same kind of coffee, the same coffee maker ,the same amount and type of water, the same perking time and the same electrical source were used.

Independent Variable

1.

Dependent Variable

2.

Controlled Variable(s)

3.

Exit TicketIn the warm up reading, you read about an experiment to test the effect of a paper airplane’s mass on the distance it could fly. Name a new INDEPENDENT and DEPENDENT variable that could be tested for paper airplanes. Independent Variable

4.

Dependent Variable

5.

PROCEDURES – What exactly are they?

The procedures for a lab or experiment are like a “recipe” for how to properly do the steps involved. Procedures should be written so specifically that anyone could understand them and would perform the steps exactly the same way.

PROCEDURES – Partner Talk

You perform certain procedures everyday as part of your daily routine. For example, you could tie your shoe or make a peanut butter and jelly sandwich without having to think about what you are doing. But before you knew how to do these, you had have someone explain how to do each step.

PROCEDURES – Partner Talk

You perform certain procedures everyday as part of your daily routine. For example, you could tie your shoe or make a peanut butter and jelly sandwich without having to think about what you are doing. But before you knew how to do these, you had have someone explain how to do each step.

TURN TO YOUR ELBOW PARTNER and pretend that you are explaining how to TIE YOUR SHOE or MAKE A PB&J for the first time. Be specific!

PROCEDURES – Candle Lab

1. Discuss the MATERIALS you will need.

2. Talk about the STEPS you will need to complete for each objective.

PROCEDURES – Candle Lab

1. Discuss the MATERIALS you will need.• Beakers of various sizes• Graduated cylinder• Clay• Tea candle• Lighter• Meterstick• Graph paper• Calculator

PROCEDURES – Candle Lab

2. Talk about the STEPS you will need to complete for each objective.

Objective 1: Determine the exact volume of each beaker.

Objective 2: Determine the relationship between beaker volume and candle burn time.

PROCEDURES – Candle Lab

2. WRITE about the STEPS you will need to complete for each objective. Remember, you need to be specific enough that someone else could understand and follow your steps!

Objective 1: Determine the exact volume of each beaker.

Objective 2: Determine the relationship between beaker volume and candle burn time.

EXIT TICKET: What are 2 things that are important to writing good procedures?