300 Definitions A.Research simply to gain knowledge B.Research performed to solve a particular problem Answer Answer
Definitions 300 Answer A. Basic Research B. Applied Research
400 Definitions Define matter. Of the following, which are matter? EarthSunlight Water Air Answer Answer
Definitions 400 Answer Matter is anything that has mass and takes up space. Water, air and earth are matter. Sunlight is energy.
500 Definitions Are changes of state physical or chemical changes? Name 4 of the following state changes: solid liquidsolid gas gas liquidliquid solid liquid gas Answer Answer
Definitions 500 Answer State or phase changes are physical changes solid liquid = melting solid gas = subliming gas liquid = condensing liquid solid = freezing liquid gas = boiling, evaporating
100 Classification of Matter Give 1 example each of solutions in which the solvent is in the solid, liquid and gas phases. Answer Answer
Classification of Matter 100 Answer Solid solution = brass, bronze, pewter, or any alloy Liquid solution = ethanol in gasoline or sugar dissolved in water Gaseous solution = air
200 Classification of Matter List the three main types of mixtures in order of increasing particle size. Answer
Classification of Matter 200 Answer Solution – smallest particles – they are individual ions, atoms or molecules Colloid – intermediate size particles Suspension – largest size particles – too heavy to stay mixed without stirring or shaking
300 Classification of Matter Explain the difference between elements and compounds. Classify each of the following as an element or compound: CH 4 N 2 S 8 NH 4 ClKI Mo Answer Answer
Classification of Matter 300 Answer Elements are composed of only one type of atom. Compounds are composed of two or more different elements. CH 4 NH 4 Cl and KIare compounds Mo, S 8 and Fe are elements
400 Classification of Matter Classify each of the following as a homogeneous mixture, colloid, suspension, element or compound Answer 1. Sprite or Sierra Mist soda 2. Gel toothpaste 3. Carbon dioxide gas 4. Latex paint (must be stirred before using)
Classification of Matter 400 Answer 1.Sprite or Sierra Mist soda = solution 2.Gel toothpaste = colloid 3.Carbon dioxide gas = compound 4. Latex paint (must be stirred before using) = suspension
500 Classification of Matter You are shown a bottle containing a liquid. Describe what you could do to determine whether it is a homogeneous mixture, a heterogeneous mixture or a pure substance. (Your answer must differentiate between all 3 possibilities) Answer Answer
Classification of Matter 500 Answer Shine a light through it – if it is scatters light, is cloudy, it is a heterogeneous mixture. If it is clear, heat a sample to boiling. If, when the liquid boils away, there is a solid left behind, it was a solution. If there is nothing left after boiling at a constant temperature, it was a pure substance.
100 Periodic Table Give the symbols of 3 metalloid elements. Answer Answer
400 Periodic Table a metalloid in Period 2. a solid nonmetal. a metal from Group 14. a liquid element from the fluorine family. a transition metal heavier than gol a halogen with more protons than tin (Sn) Answer Answer
Periodic Table 400 Answer a metalloid in Period 2 = Boron a solid nonmetal = C,P,S,I,Se a metal from Group 14= Sn, Pb a liquid element from the fluorine family = Bromine transition metal heavier than gold = Hg halogen w/ more protons than Sn = I
500 Periodic Table Name the two element rows at the bottom of the periodic table. Give two reasons why these two rows are located at the bottom of the table rather than within it. Answer Answer
Periodic Table 500 Answer Lanthanide series (lanthanoids) Actinide series (actinoids) They are apart from the table because the elements in the rows have similar properties to each other but different valence structures and properties from the other table groups. Their removal also makes the table a more manageable size.
100 Properties Classify each of the following as a chemical or physical change: Grinding peppercorns Baking a cake Grilling a hamburger Making lemonade Mixing red and blue paint to make purple Answer
Properties 100 Answer Grinding peppercorns = physical Baking a cake = chemical Grilling a hamburger = chemical Making lemonade = physical Red+Blue paint to Purple = phys
200 Properties A pure substance has the following properties: density of 13.5 g/cm 3 good conductor of electricity liquid at room temperature has a silvery luster is composed of only one type of atom Identify this substance. Answer Answer
Properties 200 Answer Hg the properties indicate it is a liquid metal element
300 Properties Isopropanol (Rubbing Alcohol) Give the following properties for this substance: Intensive, qualitative Extensive, quantitative Chemical Answer Answer
Properties 300 Answer Intensive, qualitative = astringent odor, clear, colorless, liquid at room temperature Extensive, quantitative = 500 mL Chemical = flammable, kills germs
400 Properties Explain the useful property shared by metalloids. What are the applications for these elements? (in what devices are they used?) Answer Answer
Properties 400 Answer Metalloids are useful as semi-conductors – materials which have increasing conductivity with increasing temperature Semi-conductors are used in computers, cell phones, iPods, etc. -- anything computerized
500 Properties Other than good conductivity of heat and electricity, name and define 4 properties that are unique to metals. Answer Answer
Properties 500 Answer Malleable – able to be pounded into thin sheets Ductile – able to be drawn into wire Luster – reflective, shiny Tensile strength – resist breaking when stretched
100 Potpourri Name the four phases (states) of matter Answer Answer
200 Potpourri Describe the plasma phase of matter. In what common item(s) can plasma matter be found? Answer Answer
Potpourri 200 Answer Plasma is a high temperature state of matter in which gaseous atoms have lost electrons Plasma is the material in fluorescent light bulbs, stars, the sun, neon lights, lightning.
300 Potpourri Write the word or chemical equation for the combustion of a hydrocarbon fuel. Answer Answer
Potpourri 300 Answer Word equation: Fuel + Oxygen Carbon dioxide + Water vapor Chemical equation: Hydrocarbon fuel + O 2 CO 2 (g) + H 2 O (g)
400 Potpourri In the following chemical equation, draw a box around the reactant(s). Draw an oval around the product(s) Ag + 2HNO 3 AgNO 3 + NO 2 + H 2 O
500 Potpourri Describe the 4 signs indicating a chemical change has occurred and the observations associated with each. Define all scientific terms. Answer Answer
Potpourri 500 Answer Color change (new color) Production of a gas (bubbling) Formation of a precipitate – an insoluble solid – indicated by cloudiness in a liquid Evolution of heat and/or light (flame or light produced)
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