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SCIENCE MIDTERM
so you don't flunk
| Question | Answer |
|---|---|
| Should your horse play in the lab? | No |
| What kind of behavior is expected while in the lab? | Good, respectful not playing, listening to instructions, listening to the teacher. |
| Should every accident be reported to the teacher? Even if it''s a small accident? | Yes, of course a small accident can turn into a big one. It is best to let the teacher look at it. |
| How should sharp objects be carried? | Face down, and the sharp side down. |
| Should sharp objects be disposed of in the trash can? If not, where should they be thrown away at? | No, you should give them to Mr. U, to dispose of them, or in the correct bin. |
| What should you do if your are wearing baggy clothing or have long hair and are going to work in the lab? | Change or try to tie back the clothes, or don't go in the lab at all. Tie back hair in ponytail bun, or clip etc. |
| What is the proper technique for smelling a chemical? | Wafting it. |
| In which order should you mix acid in water? | Always add acid last |
| Can you tell if a piece of glass is hot, just by looking at it? What should you do to tell if the glass is hot or cool? | Put the back of your hand over it, if it is hot, then you will feel it, if you don't feel anything, it is not hot. |
| Why should you not place hot glass in cold water? | It will shatter and break. |
| Should all chemical be dumped down the drain> If not, how should you dispose of them? | Dispose of in the proper waste container. Or get Mr.U. |
| What is the meaning of the scientific method? | It is to find answers about the physical world around us. |
| What are the six steps of the scientific method? | question, hypothesis, experiment, observation, analysis, conclusion |
| What is an hypothesis? | An educated guess |
| Give 3 examples of a hypothesis stated as an "if.... then..." statement | If I eat smarties, then I will become smart. If i drink Gatorade, then i will become more energetic. If I believe I can eat, then I can eat. |
| What is and independent variable? | It is something that can be changed by the scientist. |
| What is a dependent variable. | Something that might be affected by the independent variable. |
| What is a control? | In an experiment, the standard that is used for comparison |
| How is a control useful for an experiment? | It is to be for sure it is not just a random conclusion. |
| What is matter? | Anything that has mass and takes up space |
| What are the 3 states of matter? | Solid, liquid, and gas |
| How are solid particles arranged? | tightly packed together |
| How are liquid particles arranged? | together but still have room to move |
| How are gas particles arranged? | The particles are far apart with little contact between one another. |
| Is solids tightly packed or loosely? | Tightly |
| Are liquids tightly or loosely packed? | loosely, and fluid |
| Are gases tightly, or loosely packed? | Very loosely, and very fluid |
| What state of matter has a definite shape and volume? | Solids |
| Which state of matter has a definite volume and takes the shape of its container? | Liquid |
| Which state of matter has no definite shape nor volume? | Gas |
| What is a chemical reaction? | Two or more molecules interact and molecules change into a new substance. |
| 3 examples of signs of chemical reactions. | Unexpected color change, Unexpected temperature change, burning. |
| What is a physical change? | A change in which the form or appearance changes, but no new substances are formed |
| Give at least three examples of signs of physical change. | Change the form or appearance of a substance, Does NOT change substance into anything new, cutting something up. |
| How can you tell the difference between a chemical reaction and a physical change? | Chemical changes the item into something completely different. Physical changes nothing, it remains the same. |
| What are physical properties of matter | The characteristic physical properties of matter are color, odor, density, solubility, melting point, boiling point, and electrical conductivity. Malleability. |
| Give 3 examples of a physical property and give each one a definition (example) | Ductile- Refers to the way most metals can be stretched into wires Malleable Refers to the way most metals can be hammered into thin sheets. Brittle- Tendency of a material to fracture or fail with a small amount of force. |
| Where are metals found on the periodic table | left of the metalloids |
| What are physical properties of metals. | Luster, ductile, malleable, brittle, conductivity, and insulator |
| Where are metalloids found on the periodic table. | they are the zig zag line stair step |
| What are the physical properties if metalloids? | Solids, shiny or dull, Ductile, malleable, and conduct heat electricity better than non-metal, but not as well as metals. |
| Where are the non-metals on the periodic table? | the right of the metalloids |
| What are the physical properties of non-metals? | No luster poor conductor of heat and or electricity brittle, not ductile, not malleable, low density and low melting point. |
| What is speed? | distance/time |
| What is a force? | A push or pull motion. |
| What are balanced forces? | When an object is not accelerating or decelerating |
| What are unbalanced forces | Two forces that are unequal in size and opposite direction. |
| If an object is at rest, are the forces on it balanced? | Yes |
| If an object is moving at constant speed and direction, are the forces balanced? | Yes |
| If an object is accelerating, are the forces on the object unbalanced? | NO |
| What is the name of units we use to measure forces? | Newtons |
| What is Newton's first law? | An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. |
| What is Newton's third law? | For every action there is an equal and opposite reaction |
| What is Newton's second law? | Force = mass x acceleration |
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101dalmations
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