A river boat can travel at 20km per hour in still water. The boat travels 30km upstream against the current then turns around and travels the same distance back with the current. IF the total trip took 7.5 hours‚ what is the speed of the current? Solve this question algebraically. Let x = speed of current Upstream speed=20+x Downstream speed=20-x =) 30/20-x + 30/20+x = 7/5 =) (20-x)(20+x) = 400-x^2 =) 30(20-x)+30(20+x)=7.5(400-x^2) =) 600-30x+600+30x=3000-7.5x^2 =) 7.5x^2 = 3000-1200
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Chemical Reaction is a process that involves rearrangement of the molecular or ionic structure of a substance‚ as opposed to a change in physical form or a nuclear reaction. Reactant is a substance participating in a chemical reaction‚ especially a directly reacting substance present at the initiation of the reaction. A word equation is an equation where only the words of the products and reactants are given. It is used to describe chemical reactions using words. A skeletal equation is a chemical
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Tonsilloliths or tonsil stones are small groups of calcerous substances at the back of the mouth. These stones are specifically found on the tonsillar crypts of the tonsils. They are white small bumps in the throat; sometimes white-yellowish in color. The tonsil stones appear harmless‚ except that they can in your social life because they can really make your breath smell bad. Thus‚ you would want to remove tonsil stones using effective treatments. In treating tonsil stones‚ you actually have many
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74. b) Select one example of a physical change from your table‚ and explain why it has a physical change. Step number one where “A coarse screen made of metal bars filters large particles and trash‚ such as bottles and cans.” This would be considered a physical change because there is no chemical process taking place. As well you are able to see a physical change in the water due to trash and debris being filtered out by nothing more then a screen. This screen is doing nothing more other then
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Lab chemisty 03/27/2011 Five unlabeled bottles Set 1: A) colorless B) colorless C) blue D) blue E) colorless A: Ba(NO3)2 B: AgNO3 C: CuSO4 D) CuCl2 E) KCl Description how to identify solution: _ We have two blue solution which are CuSO4 and CuCl2 or C and D‚ according to chemical reaction experiment‚ C didn’t have any reaction with other solution like B and D beside A‚ so if we look at the solubility
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Kassidy Caviness- Thames Lab Partner: Dena Jackson Reaction lab “I certify that this lab report is my own work‚ except for properly referenced and cited information. I have adhered to all guidelines published in the student handbook on Academic Integrity‚ as well as all guidelines published for this class in the Syllabus and Academic Integrity Handouts.” Purpose- The purpose of this lab was to display to us a variety of different reactions using an eclectic of things in the chemistry lab: including
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Qualitative Observations of Double Displacement Reactions Lab Table 1.0 Qualitative Observation of Products Formed |Balanced Chemical Equations |Qualitative Observations | |BaCl2 (aq) + 2NaOH (aq)( BaOH2(aq) + 2NaCl(s) |An aqueous solution formed | | |Precipitate
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Examples of synthesis reactions: 1. Metal + oxygen → metal oxide EX. 2Mg(s) + O2(g) → 2MgO(s) 2. Nonmetal + oxygen → nonmetallic oxide EX. C(s) + O2(g) → CO2(g) 3. Metal oxide + water → metallic hydroxide EX. MgO(s) + H2O(l) → Mg(OH)2(s) 4. Nonmetallic oxide + water → acid EX. CO2(g) + H2O(l) → ; H2CO3(aq) 5. Metal + nonmetal → salt EX. 2 Na(s) + Cl2(g) → 2NaCl(s) 6. A few nonmetals combine with each other. EX. 2P(s) + 3Cl2(g) →
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Calcium Calcium is present in fly ash in multiple modes of occurrence‚ primarily lime‚ anhydrite‚ calcite and within the glassy matrix. It is the most largely released cation (Kim et al.‚ 2003). In the present column experiment‚ leached concentration of calcium was recorded as 50 ppm at 10th day of experiment. At 20th day of experiment‚ calcium concentration in leachate was found as 120 ppm. While at 30th day of experiment‚ calcium concentration in leachate was 280 ppm and at 45th day it was 450
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INTRODUCTION The lab introduced the relationship between reactants and products‚ and sought to discover which ratio of an acid and base reaction produced the most amount of carbon dioxide gas (CO2) without leaving leftover reactants. 5 varying amounts of bases were added to a constant amount of acid (10 ml) to better understand which ratio was the most efficient. RESULTS Data collected from the lab suggests that the ratio of acid to base that produced the most carbon dioxide gas (CO2) was 1:0.5
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