review study guide Flashcards
(12 cards)
what group on the periodic table has only non-reactive gases
Group 18 noble gases
what is an element
a substance that cannot be broken down into simpler substances by ordinary chemical changes an element consists of only one atom
alkali metals
what group on the periodic table has only metals?
how many protons does oxygen have
8
how many protons does carbon have
6
how many electrons does carbon
6
what is a chemical change
happens when a substance collides with another to form a new chemical
ex: iron rusting
what is a physical change
physical changes occurs when a chemical undergoes a change but not in chemical composition
ex: ice melting
what is density
the mass per unit volume
what is newtons first law
object at rest remains at rest and objects in motion remains in motion with the same velocity unless acted on by an unbalanced force
what is newtons second law
The acceleration of an object increases with increased force and decreases with increased mass
what is newtons third law
every time one object exerts a force on another object the second object exerts a force is equal in size and opposite in direction back on the first object
