Chemistry

Help pleaseee!!!Please explain how evaporation condensation and precipitation are involved in the water cycle
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Unknown compound Q is spotted on a TLC plate that is then developed in dichloromethane. The solvent front is measured at 5.2 cm and the distance traveled by compound Q is measured at 3.4 cm. A sample of aspirin is spotted on a TLC plate that is then developed in dichloromethane. The solvent front is measured at 4.15 cm and the distance traveled by aspirin is measured at 2.70 cm. What can be determined about the identity of compound Q in light of this data
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Select the correct answer.Which of these is always equal to the molar mass of any element?OAits atomic numberB.its atomic weightOC.its atomic formulaOD.its atomic structure
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hi, if your looking for extra points (50+) and br ainiest here is ur chance, answer this question correctly plz
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If I began this reaction with 1.7g of O2 , how much water would I make
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Please help me thanks
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Observa los dibujos cada uno representa una sustancia. Cada bolita representa un simboliza un tomo de un elemento.
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If more reactants are used in a chemical reaction, more products will beproduced. This is because *1 pointMore reactants have more atoms to react to form more productsMore reactants take up the same volumeToo many products can slow down the reactionMore reactants cause the reaction to heat up
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For the reaction 2h2+o2>h20, how many grams of water are produced from 70 grams of hydrogen
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Help please! its cell functions
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2NO+2CO N 2 +2CO 2 There are 3.0 g of NO and 3.0 g of CO reacting . What is the limiting reactant ?
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Tris is a molecule that can be used to prepare buffers for biochemical experiments. It exists in two forms: Tris (a base) and TrisH (an acid). The MW of Tris base is 121.14 g/mol; the MW of TrisH is 157.6 g/mol (the extra weight is due to the Cl- counterion that is present in the acid). The Ka of the acid is 8.32 X 10-9. Assume that you have TrisH in solid form (a powder), unlimited 1M HCl, unlimited 1 M NaOH and an unlimited supply of distilled water. How would you prepare 1 L of a 0.02 M Tris Buffer, pH
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True or false: All molecules or atoms in a substance have the same amount of kinetic energy at a given temperature?
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Which hypothesis is directly tested in an experiment?a. One specific confounding variable hypothesis.b. All of the confounding variables hypotheses.c. The research hypothesis.d. both b and c
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How many grams of air are required to complete the combustion of 120 g of phosphorous to diphosphorous pentoxide, assuming the air to be 23% oxygen by mass?
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milk milk milk........
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2. What is forensic odontology ? Why is this area helpful for investigators?
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Find the mass of 3.27 x 10^23 molecules of H2SO4. Use 3 significant digitsand put the units.
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1. why do the elements within a group of the periodic table have similar chemical properties?
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Please Help Me. Thank You!!!Molten aluminium is formed at the ____________ electrode where positive Al3+ ions are reduced to aluminium ions. The liquid aluminium runs to the bottom of the cell, where it is tapped off.
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Which of the following do scientists use to form a hypothesis?A.A question and observationsB.A conclusion and dataC.A conclusion and a theoryD.A question and opinions
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What is matter? Write any two properties of matter?
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