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Phy.Sc.8 Exam Review

Physical Science 8 Final Exam Review

QuestionAnswer
Which of the following is NOT an example of a physical change? the explosion of fireworks
Which of the following is a chemical property of matter? reactivity
Which property of matter is a measure of the gravitational force? weight
Which of the following events is NOT a common sign that a chemical change has taken place? change in state
What has mass and takes up space? matter
A gas has fast moving particles
Boiling point, melting point, and density are some of an element's physical properties
What pure substance forms when two elements chemically combine? a compound
How can a compound be broken down? by chemical changes
The smallest particle into which an element can be divided and still be the same substance is called a(n) atom
What particle did J.J. Thomson discover? electron
Where are electrons likely to be found? electron clouds
In Thomson's "plum-pudding" model of the atom, the plums represent electrons
Which of the following has the least mass? electron
What did Bohr, Democritus, Thomson, Dalton, and Rutherford all have in common? They each developed ideas about atoms
Periodic means happening at regular intervals
Each vertical column on the periodic table is called a(n) group
The elements to the right of the zigzag line on the periodic table are called nonmetals
Most metals are solid at room temperature
Most of the elements in the periodic table are metals
Mendeleev arranged the elements by increasing atomic mass
The horizontal row on the period table is called a(n) period
What can group numbers on the periodic table help you determine? the number of valence electrons
What do atoms, gain, lose, or share when they bond? electrons
What are the charged particles that form when atoms gain or lose electrons? ions
Most molecules are composed of what? two or more elements
Why don't noble gases normally form chemical bonds? They have a full outermost energy level
Which of the following properties of metals means that it can be drawn into wires? ductility
Which of the following represents the number of protons in an atom? atomic number
Most atoms form bonds using valence electrons
What is the joining of atoms to form new substances? chemical bonding
What is a molecule made up of two atoms of the same element? diatomic molecule
Besides being valuable, gold is special because it can be hammered into a very thin foil. This property is called malleability
Acids have a sour taste
Bases have a slippery feel
When a base is added to red litmus paper, the indicator turns blue
When acids and bases come in contact with each other, they neutralize each other
A neutral solution has a pH of 7
Brittleness and a high melting point are two properties of ionic compounds
What are two factors that determine speed? distance and time
What causes an object to start moving? unbalanced forces
What is the equation for Newton's second law of motion? F= m x a
According to Newton's first law of motion, a moving object that is not acted on by an unbalanced force will remain in motion
Air resistance causes the speed of a falling object to decrease
What is a device that makes work easier by changing the size or direction of force? machine
What is the work done by a machine on an object? work output
What is the work that you do on a machine? work input
What is a machine with a grooved wheel that holds a cable? pulley
A moving object has what kind of energy? kinetic
Waves transfer energy only
What type of wave requires a medium? sound waves
A substance through which a wave can travel medium
A wave that does not require a medium electromagnetic wave
Any disturbance that transmits energy through matter or empty space wave
The lowest point between each crest of a wave trough
Wave in which the particles of the medium vibrate back and forth along the path that the wave moves longitudinal wave
The highest point of a transverse wave crest
A wave that requires a medium through which to travel mechanical wave
A wave in which the particles of the medium vibrate in a up-and-down motion transverse wave
Created by: bhardy4