Master Chemistry with Fun Quizzes & Brain Teasers!

A blacksmith making a tool heats 525 grams of steel to 1230C. After hammering the steel, she places it into a bucket of water to cool it. Whenshe removes the steel from the water, it's at 50C. How much heat does the steel release if its specific heat capacity is 0.486 Joules/gram degreeCelslus?A. 301,000 JoulesB. 12,800 JoulesC. 1,270 joulesD. 241 JoulesE. 4.62 joules
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6) Find the pH of the following solutions:a) 0.00010 M HClO4 b) 2.35 x 10-3 M HIc) 4.678 x 10-5 M HNO3 d) 0.0000877 M HCl e) 0.00020 M HFf) 0.0000061 M H3O+g) 4.3 x 10-3 M NaOH (This is a base! Remember you will be finding pOH first!)h) 6.7 x 10-9 M KOH (This is a base! Remember you will be finding pOH first!)i) 0.00044 M HClj) C
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A sample of SO2 gas occupies 45.6 L at 373 K and 3.45 atm. This sample contains how many moles of oxygen atoms?
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4Fe +302 + 2Fe2O3 How many grams of Fe2O3 will be produced from 10.0 g of Fe and 7.00 g of O2?
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The process of fermentation involves chemical reactions that convert solid glucose (C6H12O6) into aqueous ethanol and carbon dioxide gas. Write the balanced chemical equation
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please help me. especially with figuring out c
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Which best describes a force?a vector with magnitude and directiona vector with speed and strengtha vector with direction onlya vector with strength onlyMark this and retumSave and ExitNextSubmit
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Why would scientists use a control sample that is known to be from aspecific species in an eDNA surveillance for that species?A. So they can have a negative control against samplesB. So they can cut sample DNA into fragmentsC. So they can amplify the DNA in small samplesD. So they can identify samples that contain the target DNA
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Calculate the number of moles of Li3PO4 in 2.2 L of a 0.60 M Li3PO4 solution.
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Consider the following half reactions and their standard reduction potential values to answer the following questions.Cu2+ (aq) + e- Cu+ (aq)E = 0.15 VBr2 (l) + 2e- 2Br- (aq) E = 1.08 Vi) State which reaction occurs at the anode and which at the cathode. [2 marks]ii) Write the overall cell reaction. [2 marks]iii) Calculate the value of Ecell. [2 marks]iv) Calculate the value G [2 marks]v) What is the value of Kc at 25C?
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state two importance of soil air to plants
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what are the IUPAC names of the following compounds?a,manganesse dioxedb,mercurous chloridec,ferric nitrated,titanium tetrachloridee,cupric bromide
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Why would a laptop, a car, a cellphone, and a watch all contain chemical energy?
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calculate the percent solute of 1.4g of NaCl in 46.6g of saline solution
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why natural fas is not used as a bottled gas or as a motor fuel?
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A Na2CO3 standard solution is prepared by transferring 2.4817 g of primarystandard-grade sodium carbonate (fw = 106 g/mol) to a 250-ml volumetric flask.Dissolving the sample in - 100 mL distilled water and diluted to the mark. A 25.0mL aliquot is taken and titrated with 42.65 mL of HCl, calculate theconcentration of the HCl solution?
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Coal is burned in the atmosphere to release energy. Which gas is needed for burning to take place?
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When wave-particle duality was applied to the electron, it explained why the energy of the electron is quantized because: a. The electron is a standing wave that can only have an integer number of wavelengths b. An electron can only exhibit specific velocities c. The electron must have a specific mass d. An electron will emit and absorb light quanta
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An aqueous solution contains 0.30 M potassium fluoride. One liter of this solution could be converted into a buffer by the addition of:_______. (Assume that the volume remains constant as each substance is added.) A. 0.15 mol NaOH B. 0.30 mol HNO3 C. 0.29 mol HFD. 0.29 mol KBrE. 0.15 mol HNO3
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How do you draw structural formulas 2,4-dimethylhexane; 4-methyl-2-pentene; 4-chloro-7-methyl-2-nonyne
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if the force is 200N and 5m/2 whats the pressure
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When 177. g of alanine (C3H7NO2) are dissolved in 800.0 g of a certain mystery liquid X, the freezing point of the solution is 5.9 C lower than the freezing point of pure X. On the other hand, when 177.0 g of potassium bromide are dissolved in the same mass of X, the freezing point of the solution is 7.2 C lower than the freezing point of pure X. Calculate the van't Hoff factor for potassium bromide in X. Be sure your answer has a unit symbol, if necessary, and is rounded to the correct number of significant digits.
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Big question for physicists out there:How can we be sure dark matter actually exists in our universe?
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the _ is responsible for absorbing the most uv radiation
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