8th grade science midterm exam review

Question 0

who was dmitri Mendeleev? describe his contribution to society

Answer 0

he produced the first periodic table. it helped produce the modern periodic table.

Question 1

who was issac Newton? explain and give examples and formulas of his three laws of motion

Answer 1

scientist who studied effects of force and motion
newtons 1st law- object in motion stays in motion object at rest stays at rest
ex: soccer ball won’t move unless kicked
Newton 2nd law- acceleration of an object increases with increased force and decreases with increased mass
ex: large man pushing cart goes faster than a boy
newtons 3rd law: every time one object exerts a force on another object, the second object exerts force that is equal in size and opposite in direction back on the first object
ex: jelly fish exert water to go upward and release water to go downward

Question 2

which particles are in the nucleus of an atom

Answer 2

protons neutrons and electrons

Question 3

describe the location of electrons

Answer 3

located outside of the nucleus in the shells

Question 4

what is the small part of an element

Answer 4

The ATom

Question 5

when an atom loses an electron is has a _____ charge, when one is gained, a _____ charge.

Answer 5

positive, negative

Question 6

what is an hypothesis

Answer 6

an educated guess based on textual evidence