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Chemistry Unit 2

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
Created by: whitnril