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Phy.Sc.8 Exam Review
Physical Science 8 Final Exam Review
| Question | Answer |
|---|---|
| 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
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