Earth and Space
The star nearest the Earth
What is the Sun?
a measure of the distance an object travels per unit of time.
What is speed?
the smallest piece of an element that still represents that element
What is an atom?
a description of a reaction using element symbols and chemical formulas
What is a chemical equation?
made of two protons and two neutrons
What is an alpha particle?
The motion of one object around another object
What is a revolution?
speed at a specific instant time.
What is instantaneous speed?
a particle with one negative charge
What is an electron?
describes the number of atoms of an element in a compound
What is a subscript?
the atomic number of an atom increases by one because it has gained a proton
What is beta decay?
The line on which an object rotates
What is a rotation axis?
the speed and the direction of a moving object
What is velocity?
an atomic particle that has one positive charge
What is a proton?
When atoms of two or more different elements bond, they form a
What is a compound?
an outermost electron of an atom that participates in chemical bonding
What is valence electrons?
A day when the Earth's rotation axis is the most toward or away from the sun
What is a solstice?
a measure of the change in velocity during a period of time.
What is Acceleration
a substance made of from atoms
What is an element?
are used to describe the reactant and the products
What are chemical formulas?
a model that represents the valence electrons in an atom as dots around the element’s chemical symbol
What is the electron dot diagram?
A day when the Earth's rotation axis is leaning along Earth's orbit, neither toward or away from the sun.
What is an equinox?
the rate of change of position in which the same distance is traveled each second
What is constant speed?
an atom that is not longer neutral because it has gained or lost electrons
What is an ion?
the total mass of the reactants before the chemical reaction is the same as the total mass of the products after the chemical reaction.
What is the law of conservation of mass?
a chemical bond formed when two atoms share one or more pairs of valence electrons
What is a covalent bond?