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Chemistry Unit 2
Question | Answer |
---|---|
What is the Extensive Property? | A description that depends on the amount of matter in a sample. |
What is Conservation of Matter? | A law that states that the mass of the products must always equal the mass of reactants. |
What is a mixture? | Two or more pure substances put together. Each substance retains its own set of chemical and physical properties. |
What is density? | Property of matter that describes how much mass it its volume. d = m/v |
What is mass? | The amount of matter in an object. |
What is a pure substance? | Matter that has only 1 set of chemical and physical properties. |
What is a physical change? | Something that will change the visible appearance, without changing the composition of the material. |
What is a compound? | Substances made up of more than one type of atom bonded together . |
What is accuracy? | The term for how close results come to the theoretical value. |
What is the intensive property? | Type of characteristic that only changes if you change the type of matter you are observing. |
What is precision? | The term for how well and experimenter obtains consistent results over multiple trials. |
What is purity? | Characteristic that allows us to categorize all matter. |
1 cm3 is equivalent to... | 1 mL |
What is the density of water? | 1.0g/cm3 |
What is the formula for density? | density = mass/volume or g/mL |
How do you graph density? | y axis - mass x axis - volume |
What is accuracy? | Shows whether or not your average hits the target, how close you were to the target. Average should be close to target. Also shows PERCENT ERROR |
What is precision? | Getting consistent results every time |
How many trials do you need to be precise? | At least 3 |
What is matter? | Anything that has mass or takes up space |
What are the properties used to describe matter? | Extensive & Intensive |
What is the extensive property of matter? | Depends on the AMOUNT of matter in the sample volume and mass |
What is the intensive property of matter? | depends on the TYPE of matter, not the amount present |
What are some examples of the intensive property? | Density, hardness,taste, melting point |
What is a physical change? | Changes the visible appearance, without changing the chemical composition |
What are some examples of physical change? | Cut/rip, boil, split/crack, crumple, melt |
Is physical change reversible or irreversible? | It can be either |
What is chemical change? | a change where a new form of matter is formed one substance -----> different substance |
What are some examples of chemical change? | rust, burn, decompose, ferment |
What things are often times evidence of chemical change? | Heat and light |
What is rust an example of? | A chemical property of iron. |
What are chemical reactions? | When one or more substances turns into a new substance. |
What are reactants? | What you start with in chemical reaction |
What are products? | What you make in a chemical reaction |
How do products differ from reactants? | They will have different properties |
Where does the arrow point in a chemical reaction? | From the reactants to the products. |
What are the 5 ways to recognize chemical change? | Energy is absorbed or released/temp changes Color changes Gas production Formation of a precipitate Irreversibility |
What is a clue to gas production? | bubbling, fizzing, odor change, or smoke |
What is a precipitate? | A solid that separates from a solution |
What is the Law of Conservation of Mass |