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Worksheets🚪 Exit Ticket 🎟️ - T10 Lesson 5 A Catalyst and the Rate of Rea
Total questions: 22
Worksheet time: 13mins
What is a catalyst in a chemical reaction?
A substance that becomes part of the products
A substance that slows down the reaction
A substance that helps reactants react faster
A substance that changes the color of reactants
What should be done with the solid waste after the experiment with copper II sulfate and aluminum foil?
Flush it down the sink
Leave it in the cup
Dispose of it in the Yuck Bucket or 1000 mL beaker
Burn it
What should you be able to do after the lesson on catalysts?
Create new chemical reactions
Define a catalyst and its role in reactions
Identify all types of chemical reactions
Memorize the periodic table
What is the role of yeast in the experiment?
To act as a catalyst
To measure volume
To change color
To dissolve substances
What is the significance of the foam in the "Elephant’s Toothpaste" demonstration?
It indicates a temperature change
It shows a chemical reaction has occurred
It measures the volume of liquid
It changes the color of the solution
What is the main purpose of using a catalyst in a chemical reaction?
To slow down the reaction
To change the color of the reactants
To speed up the reaction
To increase the temperature of the reaction
What is the significance of the catalyst in the demonstrations?
It changes the color of the solution
It speeds up the decomposition reaction
It cools down the reaction
It prevents the reaction from occurring
What is the expected result after adding yeast to the hydrogen peroxide solution?
The solution turns blue
The solution remains unchanged
Bubbles form and the solution feels warmer
The solution freezes
What is the role of the popsicle stick/ metal spatcula in the experiment?
To measure the temperature
To stir the solution
To add yeast to the solution
To measure the volume of the solution
What is the concentration of hydrogen peroxide used in the experiment?
1%
3%
5%
10%
What does the lack of bubbling indicate in the experiment?
The solution is too cold
Not much oxygen gas is being produced
The solution is too acidic
The solution is too concentrated
What is the expected observation if the experiment is successful?
The solution turns green
The solution remains unchanged
Bubbles form and the solution feels warmer
The solution evaporates
What is the result of electrons joining with copper ions?
Formation of copper gas
Formation of copper metal
Formation of aluminum ions
Formation of water
A(n) (a) is a substance that speeds up a chemical reaction rate.
What is the purpose of using a control in an experiment?
To increase the reaction rate
To provide a standard for comparison
To change the outcome of the experiment
To measure the temperature
What observation indicates that a chemical reaction has occurred?
Color change and gas production
The temperature decreases
The solution remains clear
The solution evaporates
This change is a
chemical reaction
physical change
musical change
all answers are correct
The reactants in the image above are:
CH4 and 2 O2
2 H2O and CO2
All of these are reactants
All of these are products
When energy like heat and light are given off in a chemical reaction it is called
exothermic
endothermic
eccentric
ectomorphic
When energy is absorbed and taken in during a chemical reaction it is called
exothermic
endothermic
eccentric
ectomorphic
You know that a chemical reaction is occurring here because you see __________________ . (Pick 3)
purple color
smoke
ice formation
fire
a yellow precipitate
