Master Chemistry with Fun Quizzes & Brain Teasers!

The density of an unknown element in the gaseous state is 1.60 g at 300 K and 1 atm. Which of the following could be the element?a. Heb. Nec. Ard.O2e. Cl2
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which of the pairs of compounds below is most likely to form a solution when mixed? view available hint(s)for part a which of the pairs of compounds below is most likely to form a solution when mixed? heptane (c7h16) and acetonitrile (h3ccn) water and ammonia (nh3) sodium chloride (nacl) and pentane (c5h12) ammonia (nh3) and isooctane (c8h18)
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How do the lengths of day contrast for the summer solstice and winter solstice?
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The Moon and stars seem to move from _____________________________ to __________________________________ across the night sky.
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How do the lengths of daylight hours and nighttime hours everywhere on Earthcompare on an equinox
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Why the southern hemisphere experiences summer when the northern hemisphere experiences winter.
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what is the molarity of a solution that contains 14.92 grams magnesium oxide (MgO) in 365ml of solution? a. 1.01 molar solution b. 1.52 molar solution c. 11.2 molar solution d. 87.2 molar solution
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can magnetism create an electric flow(a simple yes or no)
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in some communities forest are cleared through burning in the deforested and is used for farming which of these is negative consequences of this practice
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How do erosion and deposition work together to form sand dunes?O Waves cause erosion along coastlines and deposit sand away from the shore,Erosion occurs as surface water carries sediment and the sediment is deposited near oceans and lakesO Glaciers cause erosion through the movement of large chunks of ice, which are deposited and form depressionsErosion occurs through deflation, and sand that was picked up is deposited against an obstruction
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Which of these is an Arrhenius base?A.LiOHB.NH3C.H2PO4-D.CH3COOH
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How many grams of beryllium phosphate are produced when 38 grams of beryllium oxide reacts with iron (III) phosphate? Show your work.3BeO + 2FePO Be(PO) + FeO
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What is the % of each element in Al2(CrO4)3
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Ascientist is measuring the pressure that is exerted by each of the following gases in the atmosphere: carbon dioxide, oxygen,and nitrogen. Which term most likely describes what she is measuring?final pressureatmospheric pressurecombined pressurepartial pressure
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Find the specific heat of an unknown material with an initial temperature of 20C, when 5000 Joules are applied to a 50 gram sample and the final temperature is 70C
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Which statement best describes the formation of a solution?A large amount of solute is dissolved in a smaller amount of solvent.A small amount of solute is dissolved in a larger amount of solvent.A small amount of solvent is dissolved in a larger amount of solute.A large amount of solvent is dissolved in a larger amount of solute.
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1- What do greenhouse gases do in our atmosphere? a. They absorb radiation given off by the Earth b They block harmful radiation from reaching the Earth c .They keep all the air within the Earth d .They make the Earth cooler
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Calculate the pH of a 0.0150 M HNO3 solution. Assume HNO3dissociates completely in water.pH =
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Suppose you need to heat food. What wave type from the electromagnetic spectrum could you use?
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Which element has atoms that can bond to each other in rings and networks?
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List, in order, the types of light in the electromagnetic spectrum from largest wavelength to smallest wavelength.What is white light?
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The tendency of an object to resist a change. A. Inertia B. FrictionC. Law of conservation of motivationD. Force
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The figure is a square. Its diagonals meet to form four rightangles. What is the approximate value of x?O 2.8 unitsO 3.3 unitsO 4.0 unitsO 5.7 units
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How many ml of solution are needed to make a 5.78 M solution with 2.98 moles of CaO?
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