chemistry b - energy quiz
Old photographic flashbulbs burn magnesium metal in a reaction that causes a flash of brilliant white light. A photographer would need to take care not to suffer burned fingers when trying to replace the hot bulb. What best identifies the energy transformation that occurs in the flashbulb?
chemical energy to electromagnetic energy and thermal energy
Which scenario would adhere to the law of conservation of energy?
energy is transferred when atoms are rearranged
According to the law of conservation of energy, what will most likely happen in a closed system?
energy will be exchanged, but matter will not be exchanged
Which is the best example of potential energy?
holding a basketball in the air
A baseball player hits a ball. Which is the best description of the energy of the ball as it flies over the pitcher's head?
kinetic
What happens to energy when Sally kicks a soccer ball?
kinetic energy is transferred from the leg to the soccer ball
In a chemical reaction occurring in an open beaker, the reactants have a mass of 10.0 g and contain 1000 J of energy. The products in the beaker contain a mass of 5.0 g and 500 J of energy. Which best explains the difference in energy and mass as reactants are converted to products?
law of conservation of energy
What type of energy is the sum of an object's potential and kinetic energy?
mechanical energy
A generator contains a coil that spins to produce an electric current. How is energy transformed by using a generator?
mechanical energy is transformed to electromagnetic energy
When an object falls toward the ground due to gravity, what type of energy becomes kinetic energy?
potential
Which is the best term to use when describing the energy of position?
potential
thermal energy is the energy associated with
temperature
Which statement describes thermal energy?
the energy that is associated with temperature
An arrow is fired at a target on a high wall. How does the energy change between the moment the arrow is fired and the moment it hits the target?
the kinetic energy decreases as potential energy increases
Which form of energy is directly related to the measure of the average kinetic energy of the particles in a substance?
thermal energy