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Fall Semester Review
| Question | Answer |
|---|---|
| How do you figure out the number of valence electrons? | You look at the groups or families. |
| Is a paper burning a physical or chemical change? | It is a chemical. |
| What is the coefficient in an equation? | It is the number before the equation. |
| How many elements are in 5H20? | 2 elements. |
| Compounds can be chemically broken down into... | Elements! |
| List the number of protons, neutrons, and electrons in Sodium. | Protons- 11 Neutrons- 12 Electrons- 11 |
| What is a positively or negatively charged atom? | An ion. |
| What group is our sun located in on the HR Diagram? | Main Sequence. |
| What is the tallest part of a wave called? | The crest. |
| What is frequency? | The amount of waves that pass through a certain point in one second. |
| How does the wavelength relate to the amount of energy in a wave? | The longer the wavelength the more energy is has. |
| The Law of Conservation of Mass states what? | The mass of the products must be equal to the mass of the reactants. |
| What is needed to determine velocity? | Distance, time, and direction. |
| What unit is used to measure from the Earth to the Sun? | Astronomical units. |
| What indicates that the forces on an object are balanced? | The object moves at a constant velocity. |
| Astronomers use what to determine the temperature of stars? | Infrared waves. |
| How do you find neutrons? | You subtract the protons from the atomic mass. |
| A blue shift indicates what? | The object is moving closer. |
| In the HR Diagram, what is being graphed on the y-axis and x-axis? | Y-axis is brightness, X-axis is surface temperature. |
| Where is the main sequence located in the HR Diagram? | It is in the middle of the graph. |
| Where are the supergiants and red giants located in the HR Diagram? | They are located in the upper right hand corner. |
| On a pendelum, where is the greatest amount of kinetic energy? | In the center |
| How are stars classified? | They are classified by their size, temperature, and brightness |
| Light years are used to measure what? | The distance between stars and galaxies |
| What is the formula used to calculate average speed? | Distance divided by time |
| What is Newton's 2nd Law? | Force = Mass x Acceleration |
| What does a Bohr model show? | The number of protons, neutrons, electrons, and shells for an element |
| What is the rate at which everything falls? | 9.8 meters per second (squared) |
| True or False: The hottest stars are red in color. | False. The hottest stars are blue. |
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