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8th Grade Final Test
Laura Cardona made this :) 5/18/15
| Question | Answer |
|---|---|
| Define mass | the amount of matter in an object |
| Define weight | the amount of gravitational pull on an object. |
| Define density | how compact something is; compactness |
| What is the density of water? | 1 |
| What is the density of oil? | 0.8, less than 1 |
| If you need to dissolve 5g of sugar in water, how could you increase the speed at which it dissolves? | Stirring it which increases the temperature/ heats it up causing it to dissolve faster. |
| What factors lead to why you would use a model instead of doing an experiment? | too big, too small, too fast, too slow, too dangerous |
| For any given experiment, how would you improve the accuracy? | repeat it |
| Is the following a chemical or physical property: flammable | chemical property |
| Is the following a chemical or physical property: blue color | physical property |
| Is the following a chemical or physical property: reacts with acid | chemical property |
| Is the following a chemical or physical property: can rust | chemical property |
| Is the following a chemical or physical property: can melt | physical property |
| How do the particles move in a solid? | vibrating |
| How do the particles move in a liquid? | free to move, takes shape of where it is being contained: moves faster than a solid. |
| How many atoms are in a sugar molecule: C₆H₁₂O₆? | 24 atoms |
| Write a procedure to separate sand, sawdust, iron filings, salt, and styrofoam? | iron filings: magnetic, styrofoam: balloon rubbed on head, sawdust: fill with water and sawdust will float to the top, water will then evaporate so you have to filter out the sand. |
| What is the law of conservation of mass? | Mass cannot be created or destroyed, it can only change forms. |
| How are kinetic and potential energy related when moving from point A to point B on a roller coaster? | when moving from point A to point B, potential energy decreases as the kinetic energy increases. |
| What slows down pendulums and roller coasters? | friction |
| Name 4 different types of waves: | ocean, light, sound, seismic |
| What is the frequency of a wave? | how often it vibrates |
| What is the relationship between pitch and frequency? | Pitch and frequency mean the same thing except one is used in music (pitch) and the other is used in science (frequency) |
| Describe absorption | the wave/energy is pulled/put in. (absorbed) |
| Describe reflection | waves are bounced back |
| Describe refraction | waves are bent |
| What is a terrestrial planet's composition? | it is rocky |
| What is a jovian planet's composition? | made of gas |
| Why do we have phases of the moon? | half of the moon is always lit up, but because it orbits the earth, our perspective of the lit half changes. |
| What makes a planet habitable? | liquid water |
| How do we find new planets in our galaxy? | We look at the light coming from a star, if it decreases, a planet has gone in front of it. |
| Why do we have seasons? | The earth is tilted as it revolves around the sun causing the length of day to change. The tilt means the 2 hemispheres get different amounts of sunlight resulting in longer/shorter days. A longer day means a warmer season. |
| List in order by size(smallest to largest): galaxy, star, planet, atom, solar system, molecule, mineral, universe, rock, moon. | atom, molecule, mineral, rock, moon, planet, star, solar system, galaxy, universe. |
| Why does the moon have more craters than earth? | earth has an atmosphere, erosion, and is mostly water |
| On a clear, beautiful, sunny day, how do you know bad weather is on the way? | pressure drops |
| Name a non renewable resource: | gas, coal, oil, etc |
| Name a renewable resource: | hydro, solar, wind nuclear, geo thermal |
| How do humans positively affect ecosystems? | give plants plenty or CO2. |
| What is the equation for photosynthesis? | CO2 + H20 +light->O2 + sugar |
| What is the equation for cellular respiration? | sugar + O2 ->CO2 +H2O +ATP |
| Can a colorblind female have a color blind son with a husband that is not color blind? | Yes any son born has a 100% chance of being colorblind |
| Is colorblindness dominant or recessive? | Recessive because you can carry it without having it. |
| Where is the information for a human stored? | DNA |
| Name 2 communicable diseases | ebola, AIDs |
| Name 2 non-communicable diseases | cancer, colorblindness |
| What is the function of decomposers in an ecosystem? | breakdown dead stuff into useful form (soil). |
| How do the orbits of asteroids and comets differ? | Asteroids orbit closer and circular, Comets orbit further away and in an elliptical orbit. |
| What happens to the polar ice caps on Mars when they disappear? | CO2 sublimates |
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8sciencefinaltest
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