Energy package Flashcards
Name 3 types of energy?
Solar, Radiant, chemical, thermal, nuclear, Mechanical, hydraulic, Electrical, wind, sound.
What is mechanical energy?
Energy of motion
What is radiant energy?
energy from the electromagnetic spectrum
What is chemical energy?
energy in the bonds between atoms
What is solar energy?
energy from photons
what is thermal energy?
Energy from particles in motions
What is nuclear energy
Energy inside the nucleus
What does the law of conservation of energy dictate?
The law of conservation of energy states that energy can neither be
created nor destroyed; it can only be transferred or transformed. Energy
If you eat a hamburger what is the transfer of energy?
chemical to mechanical
What effects the amount of energy in thermal energy?
the amount of energy produced depends on the number of particles in
a substance. The more particles (higher mass), the more heat energy; the less
particles (lower mass), the less heat energy.
Heat transfers how?
From high tempurature to low tempurature
(Est) What is an endothermic reactions
Endothermic reactions require a constant source of energy
(think of a cake baking). The energy absorbed by an endothermic reaction is taken from its
environment, therefore causing the environment’s temperature to drop.
What is an exothermic reaction?
Exothermic reactions need energy to start, but then they can continue on
their own. The energy released by an exothermic reaction is dissipated in the
surrounding the environment,thus causing its temperature to rise.
What would be an example of an exothermic reaction?
Cellular resperation
What would be an example of an endothermic reaction?
Photosynthesis
Do all substances heat up at the same rate?
N0, When two different substances are heated, their temperatures increase, but
not at the same rate. Specific heat capacity is the thermal energy required to
make 1 g of the substance increase by 1 degree Celcius. This property is a
characteristic property. Therefore, it is unique to each substance.
What is the variation in thermal energy of 20 kg of bathwater if its temperature
falls from 30 to 27?
-251400j
A lab test shows that a maple log with a mass of 800 g must absorb 457600 J of
energy to catch fire. What change of temperature must the log undergo to catch
fire?
Is this an endothermic reaction or an exothermic reaction?
This is the case of an endothermic reaction since the heat energy (Q) is positive.
If the temperature increased (positive temperature difference), it means that the
reaction absorbed thermal energy, therefore it is an endothermic reaction.
