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Science Study Guide

QuestionAnswer
What is the density of a substance whose mass is 52 grams and whose volume is 16 mL? 3.25 g/mL
Definition of a solid the state of matter that has a defined shape and volume with molecules that are closely packed and vibrate in place
Definition of a liquid a state of matter with a defined volume but no defined shape and whose molecules roll past each other
Speed of a solid Particles in solids move slower than liquids and gasses
Speed of a liquid move about and slide past each other
Speed of a gas Particles in a gas move faster than liquids and solids
Definition of covalent bonds a chemical link between two atoms that share electrons
How many electrons are needed in the outer energy level (valence electrons) for atoms to be stable ? 8 valence electrons
Definition of a catalyst substance that increases the rate of a chemical reaction by lowering the amount of energy needed for the reaction to occur, but is not changed by the reaction
Definition of law of conservation of mass a fundamental principle of science stating that mass cannot be created or destroyed in a closed system through ordinary chemical or physical means
What are the signs of chemical reaction? Bubbles of Gas Precipitate Forms Color Changes Temperature Change Light Emitted Change in Smell/Taste
Definition of Exothermic Reactions chemical reaction that gives off heat energy
What are the characteristics of acids and bases? Acids - Sour to taste , harmful Bases - Slimmy
Definition of Motion a change in the position of an object compared to another object
What is the label for speed? m/s , mph , km/min
What is acceleration due to gravity? the change in velocity caused by a gravitational force
Definition of acceleration a change in velocity over time
Definition of velocity the speed and direction of moving objects
What is the formula for Newton's Second Law? Force= mass X acceleration
Definition of Newton's Third Law? A pair of force acting on the two interacting object
The more mass an object has, the greater the ___ and ______ speed ; acceleration
Definition of law of conservation of energy energy stays constant
Definition of a wedge a simple machine that can be used to split objects apart, hold objects in place, or lift objects from the ground; consists of two inclined planes joined together
Definition of compound machine A machine consisting of two or more simple machines operating together
What is power measured in? Power is measured in watts
Waves travel as long as they have ____. Energy
The slower the ___, the longer the ____ wave ; wavelength
Formula for sound wave f = V / λ (speed divided by wavelength)
Definition of amplitude height or "strength" of a wave
Calculate Kinetic Energy 1/2 half of your mass (divide by 2) Time velocity squared Multiply them together
Definition of series circuit an electric circuit in which the current follows a single path without branching
Definition of parallel circuit an electric circuit with multiple paths through which current can flow
Definition of an insulator a material that does not readily conduct electricity or heat
Definition of alternating circuit electricity made by moving a magnet or coli; flows in 2 directions
Created by: jalynn.davis