163482-635 Essays - Chemical Elements, Reducing Agents, Free Essays

163482-635 Essays - Chemical Elements, Reducing Agents, Free Essays 163482-635 Nam e Ali Alkhaja Grade 8(s ) MYP Science Title: Periodic table Key concept: Change Related concepts: Form, change function Global contexts: Scientific and technical innovation Topic : Reactivity series of metals Statement of inquiry: Knowledge - challenging discoveries evolve the periodic table's form to enhance its function of showing trends in the physical and chemical properties of elements. Inquiry questions: Factual : What do atoms look like? Conceptual : How do atoms can be structured? Debatable: What are the limits of scientific understanding in building periodic table? Mr.Nithin MYP Assessment Criteria Criterion B : Inquiring and designing Criterion C : Processing and evaluating Writing a lab report about " Reactivity of metals with water HCl" Due date is on Tuesday 1/Dec/2015 late submission will get zero mark Theory: The Reactivity Series of Metals is an arrangement of the metals in order of their reactivity starting with the most reactive metal at the top and ending with the least reactive metal at the bottom. The reactivity of a metal is determined by its ability to do a chemical reaction. Some metals are strongly reactive with water or HCl like potassium; some metals are weakly reactive such as copper. The reactivity series of metals was deduced by performing several experiments in the lab which enabled scientists to arrange metals according to their reactivity with HCl and water. The reaction of metals with HCl can be described in chemical formula: Metal + HCl Metal Chloride (salt) + Hydrogen e.g. Mg + 2HCl MgCl 2 + H 2 The reaction of metals with water can be described in chemical formula: Metal + water Metal Hydroxide + Hydrogen e.g. 2K + 2H 2 O 2KOH + H 2 The Hydrogen gas is flammable . A lighted wooden splint or lighter makes a popping sound in a test tube of hydrogen. Aims : In this investigation you will be able to: Draw reactivity series for different metals Test for hydrogen gas. Explain the reaction between metals and acid. Explain the reaction between metals and water. Compare the reactivity series for both metals with water and metals with acid. Describe the chemical reaction of metals with HCl and water. Materials 10 test tubes Test tube rack Thermometer 25 mL HCl (0.5 M) [ 5 mL for each test tube] 25 mL distilled water [ 5 mL for each test tube] Stopwatch Same size d pieces of metals ( Magnesium "Mg" , Calcium "Ca" , Aluminum "Al", Zinc "Zn" , Copper "Cu") Procedure : Follow the safety rules in the chemistry lab. Gather the following metals: metals ( Magnesium "Mg" , Calcium "Ca" , Aluminum "Al", Zinc "Zn" , Copper "Cu" ) Measure the acid's temperature (T i ) by using thermometer before you drop the metal into it. Remove thermometer then drop the metal into the test tube and start the stopwatch for 2 min. then observe and write your notes about the reaction.(e.g. number of bubbles, change the color, the metal disappears, smell .etc). [Hint: some reactions are instant you have to measure the final temperature directly no need to wait two minutes] U se thermometer to record the highest temperature (T f ) for each reaction . Record your measurements and observations in a suitable table. Repeat the same steps for each metal. Repeat the same steps (1 to 7) by using water. Record your measurements in another table. Work with your partner. Note as many changes as you can and discuss what you think is causing them. Communicate scientific information effectively using scientific language correctly. Present all the information appropriately using symbolic and/or visual representation accurately according to the chosen application . D escribe a problem or question to be tested by a scientific investigation O utline and explain a testable hypothesis using correct scientific reasoning D escribe how to manipulate the variables, and describe how sufficient, relevant data will be collected Design a logical, complete and safe method in which he or she selects appropriate materials and equipment. D iscuss the validity of the method based on the outcome of a scientific investigation D escribe improvements or extensions to the method that would benefit the scientific investigation . Part 1 : Introduction Problem statement: Which metals have a higher

Characters names in the Scarlet Letter essays

Characters names in the Scarlet Letter essays I believe that the characters names in The Scarlet Letter reveal the characters traits a great deal. The characters of Roger Chillingworth, Arthur Dimmesdale, and Pearl are the most dominant. Their names portray adjectives that are displayed as part of the characters personality. Roger Chillingworth is kind of a shady character in the novel. The chilling part of his name is displayed through his trickery towards Dimmesdale and how he is deceiving throughout the story. The uneven shoulders would be a scary trait that would relate back to chillingas well. The way he is described is scary enough and his name just adds to it. The name of Arthur Dimmesdale is another one. He is a handsome, unmarried pastor of Hesters church. Usually pastors are glorious people who always have a kind of light around them. However, Arthur is hiding something so his light is dimmed. Hes committed adultery and the more he tries to cover it up or confess his guilt, the more his followers begin to like him. It causes a lot of pain and guilt inside of him therefore representing the dimness of his character. The final and most prominent one is that of Pearl. Pearls are very rare jewels. The little girl in the novel is a rare child. She is the product of sin and yet she seems to be so beautiful. Everyone in the town talks about how shes so pretty but that shes the devil child. The names Nathaniel Hawthorne gave to the characters in the book I believe were directly related to how they acted. He wanted another clue to help get his point across to the reader. The characters personality reflect their names. ...