WorksheetsChemical Reactions and Energy Transfer Quiz
Total questions: 20
Worksheet time: 21mins
What factors affect the energy transfer in a chemical reaction?
The number of reactants used.
The color of the reactants.
The shape of the container.
The time of day the reaction is performed.
What causes the temperature of food to increase in a chemical reaction?
The transfer of energy from an exothermic reaction to the food
The decrease in the number of particles
Breaking the thermometer
The food generates heat spontaneously.
What is expected to happen to the particles in the surroundings when energy is transferred from an exothermic reaction?
The particles will accelerate, increasing the temperature.
The particles will decelerate, decreasing the temperature.
The particles will remain in the same state.
The particles will change to a gaseous state.
What should be included in a model to show the direction of energy transfer?
Arrows indicating the direction
Shapes representing molecules
Different colors for atoms
Symbols showing the temperature
What type of temperature change occurs when the reactants are doubled in an exothermic reaction?
An increase in temperature
A decrease in temperature
No change in temperature
A decrease followed by an increase in temperature
What happens to particles when the temperature increases?
The particles move faster.
The particles stop moving.
The particles shrink.
The particles combine.
How does an exothermic reaction affect the surrounding systems?
Transfers energy to the surroundings, increasing the temperature
Absorbs energy from the surroundings, decreasing the temperature
Transfers matter to the surroundings, changing the mass
Creates new reactants in the surroundings
When we double the amounts of reactants, what is the effect on the change in temperature?
The temperature increases more than with single reactants.
The temperature does not change.
The temperature decreases.
The temperature doubles.
What is the expected result when the same amount of energy is transferred to more food?
Lower temperature change
Higher temperature change
No temperature change
The temperature change fluctuates randomly
How can the number of reactants affect the change in temperature?
More reactants increase the change in temperature
More reactants decrease the change in temperature
The number of reactants has no effect on the change in temperature
The change in temperature is always the same regardless of the reactants
During photosynthesis energy is absorbed. What type of reaction is it?
Physical
Exothermic
Endothermic
Photothermic
The temperature is...
A measure of the average kinetic energy in a substance
The same as heat
A measure of the movement of atoms in a substance
A measure of the average potential energy in a substance
Chemical reactions that release energy are known as ________________________.
Endothermic
Exothermic
Boring
Reactions
When ammonium nitrate dissolves in water, the flask feels cold, this is an example of:
Endothermic reaction
Exothermic reaction
When methane gas is burned, carbon dioxide and water are produced. This is an example of:
Endothermic Reaction
Exothermic Reaction
Ice cubes absorb heat from their surroundings and melt into liquid water. This is an example of:
Endothermic Reaction
Exothermic Reaction
Excited but a little confused, Sam and Julie run to their chemistry teacher. Sam asks, “Professor, why did my flask cool down after adding salt to the water, while Julie’s flask heated up?” Sam's flask is an example of:
Endothermic Reaction
Exothermic Reaction
When a water heater is turned on, the water heats up due to the combustion of fuel, such as natural gas. This is an example of:
Endothermic Reaction
Exothermic Reaction
When wood burns in a bonfire, it releases energy in the form of heat and light
Endothermic Reaction
Exothermic Reaction
You open a new bag of hand warmers, and the bag heats up. This is...
Exothermic because water was added and the thermal energy increased
Endothermic because there is a chemical reaction with oxygen
Exothermic because there is a chemical reaction with oxygen and the bag heats up
Endothermic because it is similar to a chemical ice pack you get from your trainer.
