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Unit 1 Part 2 Review
| Question | Answer |
|---|---|
| Why does a wigs hair stand up the way it does | while on a VDG the electric force from the VDG generator causes a field around it which causes the hair to stick out in the direction of the field lines. |
| Why do people's hair stand up while sliding down a plastic slide at the park? | When a person slides down the slide, electrons are transferred from my hair to the plastic slide giving the slide a - charge and leaving the hair with a + charge. making them attract. |
| We know that atoms exist even though they are so small that we cannot see them. J.J Thomson, Ernest Rutherford, and Neils Bohr performed experiments to gain observations regarding atoms to revise models of atoms. | This is indirect evidence |
| If more electrons are added to the rubber rod when rubbed with fur, will all the rubber still be made up of rubber atoms? | Yes because even though there are more electrons, the protons are the same |
| Imagine if you could zoom in to see the atoms on the pie pans while on the Van De Graaf. How does the Van De Graaf forces a negative charge on the pie pans causing them to repel off the VDG machine? | It forces more negative electrons on the pie pans than positive protons making it have a negative charge |
| A glass rod charges the silk pad. The silk pad is then brought close to the wood chips. What will likely happen. | The wood chips would be attracted to the silk as the silk is charged by the glass rod |
| Charge a teflon rod with fur....what are the changes in atoms that occur when the charged rod is brought close to the wood chips? | The protons in the wood chips atoms are attracted to the negative charged electrons in the teflon rod. |
| A rod is rubbed with fur. It is able to pick up wood chips with the rod. This shows: | The rod is now negatively charged and can pick up the neutral wood chips |
| Wood chips cannot be picked up from a glass rod that has not been charged with silk first because: | The glass rod is neutral |
| BEFORE a rubber rod is touched or rubbed with fur or ANY other object it is: | neutral |
| Why did the majority of Rutherford's Alpha particles pass straight through the Gold sheet? | For Gold atoms (and any atom) there is a large area (volume) where electrons occupy called the electron cloud. This leaves lots of empty "space" from atom to atom. |
| Ernest Rutherford performed the Gold Foil Experiment where he shot alpha particles through a thin gold sheet and found that almost all but 1/10,000 were absorbed. This proves: | There is a small, dense, positive core in an atom that he named a nucleus. It was hard to hit because he only hit it once. This is because it is so small. The rest of the atom is mostly empty space. |
| What happens to particles in the liquid nitrogen balloon vs. the one that is expanded into a warmer temperature? | Due to the colder temperature they are compacted together so there is less movement between the particles. |
| Mass of a syringe with that was pushed down and pulled up and then closed= 50.2 grams, Mass of that same syringe with an open valve 52.2 grams This proves: | that when the valve of the syringe is open, air got in. Air is a gas. This proves that gases have mass. The syringe got heavier when the gases got in. |
| Your football has sat in the cold garage all winter and got flat. You fill it with air so you can get some skills! After it is pumped with air how will the mass of the ball change? | The mass will be more after getting pumped with air. |
| After my kool-aid drink packet dissolves in my water bottle, the blue sugar crystals are no longer visible in my water and my water is blue and tastes delicious. Which model of matter is this an example of and why? | Particle model because the kool aid were solid little particles but then they spread out and diffused into the water bottle. |
| What subatomic particle is mainly responsible for clothes sticking together when they come out of the dryer? | electrons |
| Now that you have more background knowledge regarding matter please pick the best student answer to this question: Can a piece of paper be cut in half indefinitely and still be paper? | No. At a small enough scale you will no longer be splitting paper and will be splitting molecules of the paper pulp into atoms. Then if you want to go further you may even split it their nucleus where the protons and neutrons are. |
| What are all materials made of? atoms | atoms |
| mass | the amount of matter in an object |
| Liquids | have medium bonds and take the shape of their container and ARE matter |
| Two objects with different charges will | attract |
| Continuous Model | Matter can be split indefinitely. The smaller piece will look identical to the larger piece. -Aristotle |
| electrons | Negatively charged particles found in the electron cloud |
| Solids | Are Matter |
| Ernest Rutherford | Gold foil experiment |
| All of the studying through time to gain knowledge of the atom is what type of observation? | indirect observation |
| Two objects with the same charge will | repel |
| Volume | The amount of space an object takes up |
| Energy | is NOT matter |
| Nuclear Model 2 | Rutherford believed there had to be another particle to account for the missing mass but could not find them. James Chadwick found them in 1932. He included them in this model. |
| matter | Anything that has mass and takes up space |
| neutrons | the particles of the nucleus that have no charge |
| Gases | are spread out and do not have bonds but ARE matter |
| Probability Model | Electrons are more often found close to the nucleus and less likely found farther away from the nucleus |
| protons | Positively charged particles with an amu of 1 and found in the nucleus |
| Light | is NOT matter |
| direct observation | taking direct measurements/data/observations on the data itself |
| Nuclear Model 1 | Found protons and the nucleus by shooting alpha particles at a thin sheet of Gold. 1 out of every 10,000 shot back showing repelling. This proved a nucleus must be small and positive. Electrons must also be separate. -Rutherford |
| Air is MATTER because it: | has mass and takes up space. Blow up a balloon! Fill in your lungs! |
| indirect observation | a measurement/data/observations of one thing to get information regarding another. |
| Plum Pudding Model | Found by the Cathode Ray experiment. He discovered electrons. From his high voltage electricity and how particles were attracted to a positive plate. He believed there was a positive charged haze around negative charged objects for an atom. -J.J Thomson |
| J.J Thomson | used the cathode ray tube to discover electrons |
| Particle Model | Matter is made up of tiny particles that are too small to be broken down into smaller pieces. Particles can also stick together in different combinations to make up materials. -Democritus |
| Bohr Model | Used the study light to determine that electrons had a specific orbit and velocity from the nucleus. |
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PhysicalScienceDTHS
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