Master Chemistry with Fun Quizzes & Brain Teasers!

When 150. g zinc sulfide are burned in excess oxygen, 68.5 g of zinc oxide are actually produced, along with sulfur dioxide. Determine the percent yield of zinc oxide after finding the theoretical production of zinc oxide. **Show the balanced equation before you begin.**
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Describe Thomsons and Millikans contributions to atomic theory.
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What is the mass in grams of 2.5 moles of Al?
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What is the mass in grams of 8 moles of Cu?
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How many moles are found in 10.5 g of Pb?
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Which of the following symbols represents a chlorine ion with a stable arrangement of eight valence electrons?
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Joebert had a rectangular cup and filled it with water. He measured the water's mass and volume. Then he got a density of 1.25g/ml. If the accepted density of water is 1 g/ml, what was the percent error of his measurement?someone can help me please?
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Write a balanced equation for the complete oxidation reaction that occurs when ethane burns in air
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Which of the following statements describes a difference between a chemical change and a physical change in a substance
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Which refers to the measure of the amount of water vapor in the air?
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Use the following Information to answer question 10.DDT is a pesticide that farmers used to spray on their crops to ward off insects.Unfortunately, once DDT is released into the environment, it does not breakdown. Because of this, DDT can spread as shown in the example below,CropInsectBird->Falcon10. In this example, as the DDT passes along up the food chain, the concentration ofDDT would:a gradually decreaseb. gradually increasec. remain the samed. decrease then increase
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You are performing an experiment and produce an unidentified compound. You know it is composed of carbon, hydrogen, and oxygen but you do not know how many of each are present. You determine its relative formula mass is 59 g/mol. What is its molecular formula? A. C2H3O2 B. C4H3O4 C. CH12O2 D. C3H4O
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pless answer thisss!!
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What is the density of water if you have 50.0 grams of water and a volume of 50.0 millimeters
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I need help, plz and thank you.
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True or False: The isotope with the greatestabundance contributes to the atomic massreported on the periodic table more thanthe isotope of lower abundance.
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what is the concept of the doppler effect?
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What causes the change within every twenty four hours from day to night on Earth?A)Earth's rotation on its axisthe tilt of Earth on its axisTarth's revolution around the sunthe distance from Larth to the SunTamashenomena on the top of the sun that appear as dark spots comparPlease answer
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I've asked before and gotten spammed hopefully I won't get spammed this time please help me with this someone. pls help anyonw
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the product of 173.06 times 0.21 should be reported as what using proper number of sig figs?
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Define the term coordinate covalent bond and give an example. please help, thank you :)
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A skittish squirrel is climbing vertically on a tree. Itsmotion is shown on the following graph of verticalposition y vs. time t.65+32+1t(s)23456789What is the instantaneous speed of the squirrel at timet=2 s?
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How is calculating a weighted averagedifferent than calculating a non-weightedaverage (like a mean average)?
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Nerve Impulses ____.A. start at the dendrite.B. are electrical signals.C. can travel backwards and forwards.D. are only found in the autonomic nervous system.
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