Energy
Energy from the sun is an example of....
radiant energy
Through the process of photosynthesis, plants convert this type of energy into another. (Need 2 answers)
radiant energy -> chemical energy
A type of change where the substance stays the same, but size and shape may change.
What is a PHYSICAL CHANGE?
What has to happen in every single chemical change?
A new substance is formed
An ice cube melts. This type of change occurred.
What is a physical change?
What is the Law of Conservation of Energy?
This law states that energy cannot be created nor destroyed, only transformed.
This type of energy is transformed into another during digestion. (Need both types of energy)
chemical to thermal
Name a physical change that occurs during digestion.
chewing, pushing food in the esophagus, absorbing water/nutrients
Two liquids are mixed and the container feels cold to the touch. This kind of change occurred.
What is a chemical change?
Type of change where the atoms are rearranged and form new substances.
What is a CHEMICAL CHANGE?
Which of the following does not belong for chemical energy?
- digestion
- food
- sun
- fuel
the sun
A bird that eats seeds converts the energy stored in the seeds into the energy of its flight muscles. This is the energy transformation that occurs. (Need 2 answers)
Chemical energy -> mechanical energy
Name 3 things that indicate a chemical change.
Formation of a gas, precipitate production, unexpected color change, unexpected temperature change, new change in odor, new substance is formed?
What kind of change in digestion is extra water being absorbed from the liquid stool.
Physical change
Leaves changing colors during the fall is considered what kind of change and why?
Chemical change because it is an unexpected color change and new substance is formed.
The ________ energy stored in your body is used to provide the _______ energy needed to walk behind the mower
potential, mechanical
Once it is night time the firefly activates its bioluminescent (starts glowing). What is this energy transformation (2 energy transfers)
chemical -> radiant
Out of these, this constitutes a physical change
a- a tablet is mixed in the the water and fizzes
b- yellow and blue liquid mix and turns orange
c- tin foil is crumpled
d- two liquids are mixed and it is warmed
tin foil is crumpled
Out of these choices, this one constitutes a chemical change occurred.
a- liquid freezes and solidifies
b- liquid evaporates
c- two liquids mix and form a solid
d- solid is dissolved into a liquid
two liquids mix and form a solid, precipitate
Which of the following is an example of chemical digestion.
- nutrients being absorbed in the small intestine
- saliva breaking down starches into sugars
- teeth grinding up food into smaller pieces
- esophagus pushing down the food to the stomach
saliva breaking down starches into sugars
___________ energy is one of the forms of energy resulting from digestion which gets _______ energy from food.
thermal, chemical
A cheetah is running and then captures and consumes its prey. This is the energy transformation that occurs. (Need 3 energy transfers)
kinetic -> thermal -> chemical
Which of the following are examples of mechanical digestion.
- stomach acid breaks down the food into smaller molecules
- salivary glands turning food into sugars
- stomach contracts and churns and mixes the food
- enzymes in the small intestine breaking down food into nutrients
stomach contracts and churns and mixes the food
Explain what kind of change (physical/chemical) a change in states of matter is.
Physical change, because the substance is only changing in appearance, shape, size and/or texture. No new substances created.
Explain how the water cycle an example of a physical change.
it is a physical change, because water changes from a liquid/solid when it precipitates, to a gas when it evaporates, then forms back into a liquid when it condensates. Then the process repeats again with the same substance, WATER!