Chemistry

what does dry ashing mean
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Calcule el volumen de disolucin de LiOH a 3.5 M, necesario para neutralizar una disolucin de 25 ml de H2SO3 cuya densidad es de 1.03 g/ml y su riqueza del 60%. (60 PTS.) Alguien puede ayudarme con esto porfabor
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A balloon originally has 0.100 moles of helium and has a volume of 0.500 L. If 0.590 grams of He are added to the balloon, what will the new volume be, in L? (Assume temperature and pressure do not change.)
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What are the two types of bonding we have studied?a. Metallic and covalentb. Covalent and ionicc. lonic and metallicd. Molecular and metallic
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1. The electron arrangement ions X and Y2 are 2, 8, and 2, 8, 8 respectively.Write the electronic arrangement of the elements X and Y. (2 mks)Write the formula of the compound that would be formed between X and Y.amk)
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How many moles are present when there are 1.00 * 10 to the 26 power
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A chemistry student is given 3.00 L of a clear aqueous solution at 17 C . He is told an unknown amount of a certain compound X is dissolved in the solution. The student allows the solution to cool to 17 C . The solution remains clear. He then evaporates all of the water under vacuum. A precipitate remains. The student washes, dries and weighs the precipitate. It weighs 0.15 kg . Using the above information can you calculate the solubility, X, in water at 17 C.
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what is the electronic structure of an atom with a proton number 11 and mass number 23
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Which statement is completely accurate? O Atoms of the same element always have different numbers of neutrons. O Atoms of the same element can have neutrons but exist without protons. O Atoms of the same element always have different atomic weights. O Atoms of the same element can have different numbers of neutrons.
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a solution is prepared by dissolving 55g of CaCl2 into 300g of water. if the Kf of water is -1.86 c/m, shat is the freezing point depression of the solution
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The mass of this atom is:u. 3 mass unitsb. 4 mass unitsc. 6 mass unitsd. 7 mass unitse. 11 mass units
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PLEASE HELP!A piece of metal is heated to a temperature of 50.0C and then placed in a calorimeter containing 50.0 g of water at 27.0C. The water temperature increases to 35.0C. How many joules of heat were transferred from the metal to the water? (Cwater = 4.18J/gC)
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Which statement describes how echolocation and ultrasound imaging are the same?A. They both use the absorption of sound waves.B. They both use the diffraction of sound waves.C. They both use the reflection of sound waves.D. They both use the transmission of sound waves.
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Answer correctly and dont bother coming to this question if you have the wrong answer.
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What does the little 2 in 2CO2 mean?
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WILL MARK BRAINLIEST!!Need help plsss
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How many milliliters of 0.20 M NaOH must be added to 75 mL of 0.050 M HCl to make a neutral solution?
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The daily dose for aspirin recommended by doctors is 81 mg/ day to reduce heart disease. a) In a week how many milligrams are administered? b) Convert the "weekly "milligrams to grams.
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Raw milk is stored at a dairy farm in a refrigerated cylindrical vat 6.50 feet wide and 12.5 feet high. If the vat contains 3.3 10 ft of milk, how many kg of milk does the vat contain, given that raw milk has a density of 1030 kg/m3?
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Can someone please answer this?
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People don't want to live in a warming world so maybe do less things that emit greenhouse gasses.
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What is the value that is MEASURED in a lab?
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qestions do you have about plate tectonics
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The acceleration of a baseball after it is hit by a bat depends on the mass of the ball and the net force on the ball. This example best illustrates which law? aNewton's law of universal gravitation. bNewton's first law of motion. cNewton's third law of motion. dNewton's second law of motion.
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