CHEM 120 (chem120)

CHEM 120 Chamberlain EXAM 1 Questions And Correct Answers Already Passed!! Hypothesis : a testable educated guess Experiment : how we test hypotheses Variable : Idea to be tested (only one) Control : Something the variable is tested against Experimental protocol : How do you do the test? Results : Data generated comparing variable to controls. Includes statistics to show results are meaningful Conclusion : Interpretation of results Independent variable

CHEM 120 Week # 1 DQ 1 – Scientific Method and Calculations CHEM120 Week 1 Scientific Method & Calculations Let’s explore the scientific method. Here is the situation: We are planting a garden. We have a variety of bulbs & potted plants. We do not have any directions on how or when to plant each of these items. We do not have any gardening books, magazines, or access to the Internet (Oh, the horror!). We need to observe a number of characteristics for these plants. What are some...

Chemistry correct answer: The study of the properties of matter and how matter changes Basic Unit in Chemistry correct answer: atom Types of Chemistry correct answer: Green Chemistry Sustainable Chemistry green chemistry correct answer: uses materials and processes that are intended to prevent or reduce pollution at its source replacing rare hazardous with more abundant less hazardous Example of green chemistry correct answer: replacement of mercury fluorescent light bulbs wi...

produces H+ in water correct answer: acid is named hydroiodic acid correct answer: acid is named magnesium hydroxide correct answer: base turn phenolphthalein pink correct answer: base conducts an electrical current correct answer: acid and base properties of acids correct answer: dissolve many metals, taste sour, turn litmus paper red properties of bases correct answer: taste bitter, turn litmus paper blue, feel slippery strong acids correct answer: HCl, HI, HNO3, H...

Hydrocarbons correct answer: contain only carbon and hydrogen Alkanes correct answer: single bonds, saturated, sp3 hybrid, tetrahedral, 109.5 deg, sigma bonds only, free rotation about C Alkenes correct answer: double bonds, unsaturated, sp2 hybrid, trigonal planar, flat, rigid about C, pi bond, polyunsaturated:many double bonds Alkynes correct answer: triple bonds, unsaturated, sp hybrid, linear Aromatic correct answer: benzene ring, unsaturated Structural Formula correct an...

carbonate correct answer: CO₃²⁻ nitrite correct answer: NO₂⁻ nitrate correct answer: NO₃⁻ Hypoclorite correct answer: ClO⁻ Phosphate correct answer: PO₄³⁻ sulfite correct answer: SO₃²⁻ sulfate correct answer: SO₄²⁻ ammonium correct answer: NH₄⁺ acetate correct answer: C₂H₃O₂⁻ oxalate correct answer: C₂O₄²⁻ cyanide correct answer: CN⁻ hydroxide correct answer: OH⁻ Hydrogen Carbonate correct answer...

What do you need to accomplish before you can start the lab? correct answer: WHIMIS Things to do to prevent accidents/injury? correct answer: Pay attention to instructions Never leave equipment unattended Keep work area clean Wipe spills immediately No personal belongings on top Learn disposal and handling requirements of chemicals Keep hands from touching self after working with chemicals Make sure all equipment works sufficiently No food or drink in lab Make sure to wear: - Sa...

What is the recommended protective clothing for the lab? correct answer: Safety goggles: -slash proof safety goggles are required and give the max protection from spills and flying objects Footwear: -shoes that fully cover the feet Lab coats: -not required but strongly recommended to protect skin and clothing -long hair must be tied back no food or drink Describe the first aid used for chemicals on the skin, eye and cut/abrasions/burns correct answer: -in general best course ...

Celsius formula - C= (F-32)/1.8 Kelvin formula - K=C+273.15 density formula and units - D (g/mL, g/L, Kg/m^3)= M (kg) / V (m^3, cm^3, L , mL) Precision - a measure of how close a series of measurements are to one another Accuracy - how close a measurement is to the true value Law of Conservation of Energy - Energy cannot be created or destroyed kinetic energy formula - KE=1/2mv^2 Endothermic - Absorbs heat Exothermic - Releases heat pure substance - Cannot be purified,...