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chemistry
| Question | Answer |
|---|---|
| what are the 5 things of particle theory of matter | 1. all matter is made up of tiny par 2. Each pure substance is its own kind of par, different from par of other substances 3. there is always space between par 4.par are always moving, they move faster at higher temps 5. par attract each other |
| what is matter | matter is what anything that has mass of volume is made up of. all matter is made up of particles |
| a substance has a definite volume and definite shape. what is it? | solid |
| a substance has a indefinite volume and indefinite shape. what is it? | gas |
| a substance has a definite volume and indefinite shape. what is it? | solid |
| matter - x, (- x,x) x (-x,x) | pure substance (element, compound) mixture (homogeneous/solution, heterogeneous/ mechanical mixture) |
| what are the two types for properties used to describe matter | Physical and chemical |
| what is a quantitative properties | about the numbers/is measured |
| What is a qualitative property? | describing factors/is not measured |
| "A student observed an object and reported that it had a volume of 1.96 g/ml, had a height of 5.90 mm, was orange in colour on the outside, and was very shiny." what is qualitative and what is quantitative | quantitative- 1.96g/ml and 5.90mm qualitative- orange and shiny |
| What are the 2 different types of matter? | pure substance and mixture |
| Define pure substance: | element or compound that only has one type of particle and is homogeneous |
| What are the 2 groups of pure substances? | element and comound |
| Define elements and give 2 examples of elements that can be found in the classroom | a element is a pure substance with only one type of atom and it is found on the periodic table ex, gold, silver |
| Define compound and give 2 examples. | 2 or more different types of atoms are chemically bonded, its a pure substance, has a chemical formula, ex. water carbon |
| define solution. What type of mixture is a solution? | a solution is homogeneous mixture, looks the same throughout and you can't tell the components apart, ex. milk and coffee |
| Define mechanical mixture. What type of mixture is a mechanical mixture? | a mechanical mixture is a heterogeneous mixture and you can tell the different parts apart, ex. salad, chocolate chip cookie |
| What is an alloy? | a alloy is a solution of 2 or more metals ex. brass (copper and zinc) |
| What are the two types of changes in matter that we discussed in class? | physical, chemical |
| what is a physical change? | changes shapes or forms but it stays the same substance |
| What are the 3 types of physical change that we covered in class? | state, desloving, breaking and changing shape, deformation |
| What is a chemical change? | a irreversible change to a substance ex. tasting bread |
| What are the 3 major types of chemical change? | corrosion, combustion, reaction with acid. |
| What are some of the clues a scientist can observe to determine if a chemical reaction has taken place? | colour change, odor change, gas or gas bubble formation, precipitate, heat or light emitted |
| What is the only unquestionable way to know a chemical change has occurred | a new substance is formed thought a irriverable change |
| what is ductility | the ability to be draw out into long, thin wires, ex. silver is pulled into wires |
| what is malleability | the ability of matter to be harmed or bent into different shapes ex. most metals malleable, glass not bc shatters when harmed |
| what is hardness | how resistant a solid is to being scratched or dented |
| what is boiling point/melting point | temps where a substance changes state |
| what is solubility | the ability for a substance to resolve in water |
| what is viscosity | how easily a substance flows, ex. ketchup is more viscous then water |
| what is lustre | the ability of a substance to reflect light (shiny or dull) |
| what is clarity | can be transparent, translucent or opaque |
| what is density | mass to volume ratio; how much "stuff" (mass) is packed into a given space (volume) |
| what is combustability | the ability of a substance to react with oxygen to form carbon dioxide, ex. gas is brought close to a flame it ignites creating a new substance. |
| what is corrosion | metal interacting with oxygen forming oxidies, iron with oxygen is iron oxide, also called tarnishing or rusting |
| conductivity | the ability to conduct electricity or heat |
| what is a precipitate | A precipitate is a solid that forms and separates from a solution, often during a chemical reaction |
| The snow on the sidewalk outside your house melts. chemical or physical? why? | physical - change of state |
| b. A piece of copper gradually turns green when left exposed to air. chemical or physical? why? | chemical- change of colour, oxidization |
| c. Milk turns sour after several days. chemical or physical? why? | chemical, change of odor, new substance |
| d. The three sugar cubes that you add to your coffee disappear when you stir the coffee. chemical or physical? why? | physical - dissolving, can be reversed |
| f. Lighting a log on fire in a fireplace chemical or physical? why? | chemical - combustion |
| e. You accidentally spill some bleach on your favorite blue shirt and end up with white stains on the shirt. chemical or physical? why? | chemical (irreversible, colour change) |
| g.In a science lab, you mix 5 drops of copper (II) chloride solution and 2 drops of sodium carbonate solution in a spot plate. When the two liquids are mixed a solid is formed. chemical or physical? why? | chemical - precipitate |
| h. You heat sugar on a spoon. The sugar melts and then caramelizes. chemical or physical? why? | physical- melting sugar (change states) chemical -change colour |
| i. You are cooking Kraft Dinner at home. The water heats up in the pot and starts to boil. Some of the liquid water becomes gas. chemical or physical? why? | physical- change of state |
| List and define 3 properties of a physical change | viscosity, ductility, density, solubility, hardness |
| List and define 3 properties of a chemical change | colour, odor, temp or light energy shift, precipitate |
| Calculate the density of an object, which has a mass of 21.0 g and a volume of 2.00 cm3 | 1.5g/cm3 |
| If the density of iron is 7900 kg/m3 and you have a piece of iron with a volume of 1.0 m3, what would the mass of this piece of iron be? | 7900kg |
| Coal has a density of 2250 kg/m3. How much volume would a 20 kg bag of coal take up? | 0.009 cm3 |
| Calculate the density of a rectangular prism with a length of 2cm, a width of 3cm, and a height of 5cm. The rectangular prism has a mass of 40 g. | 1.3 g/cm3 |
| what are reactions with acids | the ability of a substance to react with acids, ex. limestone = acid produce gas bubbles (new substance) |
Created by:
Nicole224L