Master Chemistry with Fun Quizzes & Brain Teasers!

Write isotopic symbols in the form 4X for each isotope.(a) the oxygen isotope with 8 neutrons(b) the fluorine isotope with 10 neutrons(c) the sodium isotope with 12 neutrons(d) the aluminum isotope with 14 neutrons
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How does a dynamo generate electrical energy?
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Which two families of elements are soft and silvery and have low densities? Choose two.
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can you help me with this problem? just tell me what number is it closer to.
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Why the sulphides precipitate of group IIA should be washed with distilled water and then centrifuged before addition of dilution solution of HNO3?
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Which two bonds are least similar in polarity?Select one:a. I-Br and SiClb. B-F and Cl-Fc. C-Cl and Ge-Cld. O-F and Cl-Fe. Ga-Cl and I-Br
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Earth Science, 25 points.Review the properties and uses of the unknown mineral. It is...(a) talc(b) gypsum(c) hematite(d) quartz
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which of the following are NOT correctly balanced reactions?
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A 75 mL sample of He gas is at 97C and 0.975 atm. If the sample is cooled to 29C and the pressure is increased to 1.25 atm, what will the new volume be?
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explain the differences of molecules and formula units
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Can starch and flour be used interchangeably in all cases? Explain.
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Question 18Identify the Type of Chemical Reaction: 2Ago - 2Ag + 021AnswerF) Synthesis or Combination ReactionG) Decomposition ReactionH) Single Replacement Reaction1 Double Replacement ReactionK) Combustion Reaction
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Which of the following is a valid combustion reaction?O CH4 + O2 2C + 2HOO Mg + HO MgO + HO N + 2022NOOS+0 S + HO
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333Identifying States of MatterUse the drop-down menus to complete the statements.have a definite shape and volume.do not have a definite volume or shape.have a definite volume, but the shape may change.
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What is the mass of the oxygen used during the reaction? Iron (19.43) and iron oxide (20.91).
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A retina of a human eye can detect light when radiant energy incident on it is at least 4.0 x 10^-17 J. For light of 600-nm wavelength, how many photons does the correspond to?
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HELP ME, MY LAST QUESTION WRONGWhich graph shows acceleration?Which graph shows acceleration?A graph of position (meters) versus time (seconds) has a straight line running from 0 seconds 0 meters upward.A graph of position (meters) versus time (seconds) has a concave line running from 0 seconds 0 meters upward.A graph of position (meters) versus time (seconds) has a straight line running from 0 seconds positive number of meters downward to some later time 0 meters.
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What description explains how pollen is received? The ovule at the top of the pistil receives pollen. The stigma at the top of the pistil receives pollen. The pistil at the top of the stamen receives pollen. The stamen at the top of the pistil receives pollen.
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Which group is known as the halogens?A.01B.2C.17D. 18
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1. Which of the following substances contributes most to the depletion of theozone layer?
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Explain the relationship between atomic mass and atomic number in your own words
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Question is in the image
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- Jim passes a 1.5 kg basketballof 60 N. Find the accelerationA. 40 m/sB. 40 m/sC. 90 m/sD. 0.025 m/sto his teammate with a forceof the basketball.
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A 2 kg box is moving at 5 m/s on a frictionless plane.When will it stop?A. after 1 secondB. after 10 secondC. after 20 secondsD. never
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