Patrick Kelly 10/16/12 Physical and Chemical Changes Lab Question: How do you distinguish a physical and chemical change? Hypothesis: If we use these materials and use magnets‚ water‚ burners‚ and filters on the mixtures and elements given we should determine what kind of effect these materials given will have on these mixtures and elements‚ physical or chemical. Procedures: -Part A: Record all observations of Part A in Data Table 1 1. Label each substance on seven pieces of paper
Premium United States Management Marketing
Observing and deciphering Chemical Changes Purpose The purpose of this experiment is to observe reactions of chemicals that can be found in consumer products. Through observation‚ students should be able to interpret the chemical reactions and determine some characteristics‚ such as pH and solubility. Method 1. Pipets containing chemicals will be opened using scissors to snip the end and each pipet will be placed in a well of a 24-well plate. The scissors must be washed between each pipet. 2
Premium Chemical reaction Chemical substance Solubility
Rachel Rodriguez Anthony Chirumbolo December 8‚ 2011 Chemistry I‚ Pd 11‚ Station K Evidence of Chemical Change Purpose To observe several chemical changes (reactions) and the evidence they exhibit for chemical change. Data See page 3 Analysis The two terms that describe possible energy change in a chemical reaction are Exothermic‚ for example when a gas is formed when Copper II Chloride and Aluminum are mixed‚ and Endothermic‚ for example when copper II Hydroxide is heated
Premium Chemical reaction Chemistry Hydrogen
Essay : Junk Food #Draft 2 Published by MDMUAZZAM under on 11:08 PM Junk food is being blamed for causing many undesirable problems to children. It is referred to any food that is low nutritional value such as instant noodles‚ potato chips and chocolate bars. Takeaway foods‚ pre-packaging meals and sugary snack food are also included as junk food (Trab 2005). In response to the problem‚ I strongly believe that the sale of junk food should be banned. The first reason why junk food should be banned
Free Nutrition
Chemical equilibrium is a state of balance within a system of chemical reactions. Equilibrium in chemistry is achieved when substances are produced and broken down at the same rate and thus‚ the number of molecules of each substances becomes constant. Thermodynamics is a branch of physical science that involves the relationship between heat and other forms of energy (Energy‚ Enthalpy‚ and the First Law of Thermodynamics). There is a more specific area of thermodynamics that explicitly pertains to
Premium Thermodynamics Entropy Chemistry
Year 11 Module 1 – The Chemical Earth The Earth is made up of a large number of different substances: elements‚ compounds & mixtures We can classify elements & compounds as pure substances. These are always HOMOGENEOUS. Mixtures are not pure substances and can be either homogeneous or HETEROGENEOUS. Pure substances have a fixed composition eg copper metal‚ sulfur‚ carbon dioxide (CO2)‚ methane (CH4). Mixtures have variable composition and can also be separated into its components relatively
Free Atom Chemical bond Chemistry
Executive Summary of Victoria Chemicals Problem Definition: The organization‚ Victoria Chemicals‚ must determine whether or not to improve engineering efficiency through facility improvements at its production plant Merseyside Works. Relevant Facts: The Merseyside Project was evaluated with respect to the following criteria: (1) Impact on earnings per share (2) Payback (3) Discounted cash flow (“DCF”) and (4) Internal Rate of Return (“IRR”). The initial assessment of this project was based
Premium Net present value Internal rate of return
1-What type of hazard could occur by wearing jewelry while preparing food? A-Physical and biological 2- The greatest concern about having the pests in restaurants is that they will ----------- A-? 3-bactarial growth can be minimized by ------ A- Time temperature oxygen moisture 4-The term sanitizing is defind as: A- Reducing harmful microorganism to safe level 5-The proper sequence for cleaning food contact in a three compartment sink is: A- Wash‚rinse and sanitize 6- Which will be the best method
Premium Hygiene Hand sanitizer Catering
Food Productions & Consumption Choices Food is one of the most needed supplies that we all need in our daily life. And with the advances of today’s technologies‚ we are able to produce bigger amount of food as compare to the older days. However‚ food production companies have taken the technology advantages to produce a massive amount of food by adding too much antibiotics and chemicals that could eventually affect the health of the consumers. Taking from the film called "Food Inc.”‚ it has shown
Premium Nutrition Food
?Chemical Medications or Natural Healing Many times when people get sick they go to the doctor to be diagnosed‚ then they make their way to the pharmacy to pick up the prescriptions the doctors say you need to cure the problem. What if the prescription is wrong? But is there a better solution? Natural healing is much better than any chemical medication the doctor prescribes to you because they are natural and more effective. Many prescriptions are easy to overdose on‚ and usually end in death
Premium Alternative medicine Medicine