Sci Rev Flashcards
When valence electrons are in their lowest possible energy they are in their ____
Ground state
What can cause valence electrons to become excited
Heat
What do valence electrons do when excited by heat?
They jump up an energy level into an excited state
When valence electrons move they either _____ or ____ light
Absorb or emit
What do valence electrons returning to a lower level do?
Emit light
Shells increase in energy from ____?
The innermost shell outwards
What is the equation for photosynthesis?
6H2O + 6CO2 –> C6H12O6 + 6O2
Where does photosynthesis occur?
Chloroplasts
Respiration releases the chemical energy in _____ for use in ______
Glucose for use in life processes
What’s the equation for how many electrons can fit in each shell?
2 x shell number (squared) , e.g., 2 x 4 (squared) =
If an atom loses an electron it becomes what?
Positively charged, a cation
If an atom gains an electron it becomes what?
Negatively charged, an ion
Ionic bonds form between what?
A metal and a non-metal
Neutrons will have one more digit than protons if it is an uneven number, T or F?
True
What is an unbalanced force called?
A net force
What are the 4 forces of flight?
Lift, drag, weight and thrust
What is Newton’s first law?
Law of Inertia
What is the Law of Inertia?
If in object is at rest it will stay at rest and if an object is moving it will keep moving at constant speed unless an external force acts on the object, e.g., when you kick a ball uphill and it stops due to gravity.
What is Newton’s second law?
Law of Acceleration
What is the Law of Acceleration?
When an external force is applied to an object, it causes it to accelerate, e.g., force = mass x acceleration
What is Newton’s third law?
Law of Motion
What is the Law of Motion?
Every time there is an action force, there is also a reaction force that is equal in size and acts in the opposite direction, e.g., when you sit on a chair it is applying an equal amount of force back, otherwise you would fall through or you would bounce off the chair.
What are the forces?
Push, pull, or twist applied from one object to another
What is drag?
Friction with the air that slows the plane down
