Chemical Bonding Lab Chemical compounds are combinations of atoms held together by chemical bonds. These chemical bonds are of two basic types—ionic and covalent. Ionic bonds result when one or more electrons from one atom or group of atoms is transferred to another atom. Positive and negative ions are created through the transfer. In covalent compounds no electrons are transferred; instead electrons are shared by the bonded atoms. The physical properties of a substance‚ such as melting point
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contact with our body‚ the degree of injury are depends on the magnititute of hazards and susceptibility of person. Respirator - designed to absorb the contaminant that come into contact by inhalation Protective clothing‚ gloves‚ apron‚ goggles and shoes – design to prevent absorption of chemical splash to the skin Safety helmet-to prevent from the sharp object falling on the head The effectiveness and efficiency of protection depends on proper
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from getting shot. Even without a mask on. Although eye injuries have been reported‚ this is due to the fact that an unsafe game was played. Most likely someone decided that they were superman and took off their goggles in the middle of a game and no ref was there to stop him. All goggles worn during paintball should and are approved by the government and you are not supposed to shoot above a speed of 300 feet per second. Yes‚ paintball leaves welts‚ but most people can stand them. The pain of a paintball
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in a graduated cylinder stands at 20.0 mL before and at 26.2 mL after a 16.74 g metal sample is lowered into the cylinder. What is the density of the sample? c. 1.2 g/mL Safety: Used goggles. Materials: Triple Beam Balancer‚ Water‚ Beaker instead of graduated cylinder‚ solid metal block‚ and goggles. Procedures: | Observations | 1. Measure Mass using Triple Beam Balance | | 2. Measure Volume by using water displacement method. Fill a 50 mL graduated cylinder about half full
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“Hazard Communication” for all existing chemicals that are currently sold. 3. What can make glassware unusable? Glassware is unusable in an experiment when it is chipped‚ broken‚ or cracked. 4. When should you wear goggles in the lab? You should wear safety goggles at all time. 5. How long should you wash your eyes if you get a chemical in them? If you have contact with chemicals in your eye‚ it should be rinsed for ten minutes. 6. What should you do if your clothing catches
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The specific heat capacity for water is 4.18 Joule/gram Kelvin degree Safety • Tie your hair back • Wear goggles • Don’t throw matches in the sink • Glassware can break when rapidly cooled or heated • Hot glassware can cause burns Materials • Apron • 250-mL Beaker • Bunsen Burner • Calorimeter • Goggles • Graduated cylinder • Matches • Metal • Ring stand • Ring • Water • Wire
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does affect evaporation will not be able to be measured in the short time available for each experiment Temperature * Bunsen Burner * Tripod * Heat Mat * Gauze * Beaker * Measuring Cylinder * Water * Thermometer * Safety Goggles * Gloves * Tongs * Scales Method Equipment - Control Variables * In this experiment the control variables are the volume of water we use for each beaker. If we change the volume of water for each beaker‚ the results we get will not
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Veins." National Heart Lung and Blood Institue 1 Feb. 2011: n. pag. goggle. Web. 20 May 2012. <http://www.nhlbi.nih.gov>. Staff‚ Mayo Clinic Train‚ Henry D‚ M.D. "Vein Center of Central Pennsylvainia." Paveins. Vein Center of Central Pennsylvania‚ 2008. Web. 20 May 2012. <http://paveins.com>. "Varicose Veins." Cardio Smart: n Weiss‚ Robert‚ M.D. "Varicose Veins and Spider Veins." Medscape (July 2010): n. pag. goggle. Web. 21 May 2012. <http://www.medicine.medscape.com>.
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the NaOH buret 10) Subtract the final volume of NaOH from the initial volume. 11) Repeat this process at least twice more. Materials: Buret (50mL) Graduated Cylinder (10mL) Beakers (250mL) Buret stand Erlenmeyer flask (125mL) Safety goggles Buret clamp 0.10M HCl (aq) (25.0mL) NaOH (aq) Vocab: Standard Solution: a solution containing a precisely known concentration Titration: a measured amount of a solution of unknown concentration is added to a known volume of a second solution
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Variables: Independent Variable: Ratio of reactants Dependent Variable: Temperature change Controlled Variable: Total number of moles of reactants Apparatus: Protective Goggles Thermometer Graduated Cylinder Sodium Hypochlorite (NaClO)‚ solution
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