Types of Reactions
Lab Safety
Variables
Phase Changes
100
When heat is absorbed, it is an
Endothermic Reaction
100
You are heating a substance in a test tube. Always point the open end of the test tube ________.
Away from yourself/anyone else.
100
Ms. J sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the independent variable.
Mass of the ball
100
C
200
The temperature increases outside of this reaction
Exothermic Reaction
200
Personal eyeglasses provide as much protection as ________.
A face shield.
Safety goggles/glasses.
Splash proof chemical goggles.
None of these.
None of these.
200
What is the DEPENDENT variable (effect) in this experiment?
"Does eating breakfast improve test scores?"
Test Scores
200
The change of one state of matter to another is called
Phase Change
300
What type of chemical reaction is this?
Endothermic
300
The proper technique for smelling chemicals is ______________
A keeping your nose close to the glassware
B wafting
C to sniff only a small amount
D Trick question; you never are allowed to smell chemicals in class
B Wafting
300
You are testing how the amount you water a plant affects its growth. What would be the INDEPENDENT VARIABLE in this experiment.
Amount of Water
300
What happens to molecules when their kinetic energy increases?
Molecules move faster
400
Which of these processes is always exothermic?
A. evaporation
B. burning
C. insulation
D. melting
B. Burning
400
When should accidents be reported to the teacher?
A if the injury is minor, it doesn't need to be reported
B immediately, no matter how small
C at the end of class
B
400
Molly investigated if the age of students caused them to be better drivers. What is the independent variable?
Age of students
400
Three containers with the same amount of the same material are shown below. Which container has the substance with the highest amount of energy?
Gas
500
Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the most exothermic?
A. temperature rises by 3 \degree C°C
B. temperature falls by 5 \degree C°C
C. temperature falls by 3 \degree C°C
D. temperature rises by 5 \degree C°C
D. temperature rises by 5 \degree C°C
500
When should you tie back long hair or baggy clothing?
At All Times
500
The one factor that a scientist changes during an experiment. (It affects the results of the experiment).
Independent Variable
500
The phase change from water vapor to liquid water is known as...
Condensation