Master Chemistry with Fun Quizzes & Brain Teasers!

Additional evidence of an exothermic reaction issound
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If a piece of aluminum has a heat capacity of 314 j/c, how much will its temperature rise when it absorbs 8,291 j of heat?
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The elephant toothpaste reaction and the reaction of sugar and sulfuric acid are examples of
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This is the chemical formula for cassiterite (tin ore):sno2a geochemist has determined by measurements that there are 3.316 moles of tin in a sample of cassiterite. how many moles of oxygen are in the sample?be sure your answer has the correct number of significant digits.
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The parents are heterozygous; their offsprings phenotype are 25% Black 50% speckled & 25% white: What was the phenotype of the two parents
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Jeremiah is conducting an investigation about the water cycle. He is given the following materials:a lampa glass jar that contains waterplastic wrapDescribe how Jeremiah can arrange these materials to create a model that shows the processes by which water is cycled from a lake into the atmosphere and back to the lake. Be sure to identify what each material represents in the model.Input Field 1 of 1Skip to input field
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A chemical reaction produced 125mL of CO2. What was the mass of the gas produced?
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If you have 500 ml of a 0.10 m solution of the acid, what mass of the corresponding sodium salt of the conjugate base do you need to make the buffer with a ph of 2.08 (assuming no change in volume)
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Ammonia burns in oxygen according to the following equation:4nh3 + 3o2 2n2 + 6h2ohow many moles of nitrogen gas are generated by the complete reaction of 8.56 moles of ammonia?
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The hydroxyl end groups of a sample (2. 00 g) of linear poly(ethylene oxide) were acetylated by reaction with an excess of acetic anhydride (2. 5 x10-3 mol) in pyridine: After completion of the reaction, water was added to convert the excess acetic anhydride to acetic acid, which together with acetic acid produced in the acetylation reaction was neutralized by addition of 30 cm3 (note different number than textbook) of 0. 100 mol/dm3 solution of sodium hydroxide. Calculate the number average molar mass for the sample of poly(ethylene oxide) given that each molecule has two hydroxyl end groups. Poly(ethylene oxide):
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It is the basic element of drawing that helps us illustrate the realistic view of an object *linealphabet of linesdrawinglay-out
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Silver reacts with hydrogen sulphide gas, and oxygen according to the reaction: 4Ag(s) + 2H2S(g) + O2(g) 2Ag2S(s)+ 2H2O(g) How many grams of silver sulphide are formed when 1. 90 g of silver reacts with 0. 280 g of hydrogen sulphide and 0. 160 g of oxygen?
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A decomposition of hydrogen peroxide into water and oxygen gas is an exothermic reaction. If the temperature is initially 28 C, what would you expect to see happen to the final temperature? Explain what is happening in terms of energy of the system and the surroundings.
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Based on the equation and the enthalpies of formation shown, what is the AH of the reaction? A.-5335.8 B.-2815.8 C. -580.7 D.580.7
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If 66. 38 g of potassium chloride reacts with fluorine and produces potassium fluoride and chlorine how many moles of chlorine can you get?
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Suppose you are a farmer trying to produce a high yield of corn to sell for themanufacturing of ethanol, the main ingredient in flex fuels (e85). in order to producea large corn crop, you need to purchase a fertlizer that is high in nitrogen. given thechoice of two fertlizers, ammonium sulfate or ammonium phosphate, which onewould you choose to yield the largest amount of corn? explain your answer. hint:determine the percent of nitrogen in each fertilizer.
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What is the mass in grams are in 3. 45 x 10E24 atoms of carbon
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A series of lines in the spectrum of neutral Li atoms rise from transitions between 1s2 2p1 2P1s 2 2p 12 and 1s2nd1 2D1s 2 nd 12 D and occur at 610. 36 nm, 460. 29 nm, and 413. 23 nm. The d orbitals are hydrogenic. It is known that the transition from the 2P 2 P to the 2S 2 S term (which arises from the ground-state configuration 1s22s1)1s 2 2s 1 ) occurs at 670. 78 nm. Calculate the ionization energy of the ground-state atom
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How many grams are in a sample of 7.9 moles of zinc?
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Bailey got sick and heard that he should gargle salt water to help his throat. He adds 25g of salt(NaCl) to a cup with 250mL of water(H2O). What is the concentration of this salt water in mol/L? Sodium has atomic mass 22. 99g/mol and chlorine has atomic mass 35. 45g/mol
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Calculate the ph of the resulting solution when 85 mL of 0. 3 M nitric acid is mixed with 75 mL of 0. 2 magnesium hydroxide
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Calculate the energy of rogue wave of this amplitude. 15 meters
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A scientist in the city design a plan that will help produce the impact of future droughts that may occur in the area. Wich of the following would most likely be apart of the scientist plan
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Name the following compounds:a. C2H4 or H2C=CH2b. CsH6 or CH3CH=CH2C. C4H8 or H2C=CHCH2CH3d. CaHs or CH3CH2=CH2CH3e. CsH1o or CHaCH2CH2CH=CH2
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