Chemistry

Observation when separating iron filings, sand and salt
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Matter is anything that has mass andO energyO volumeO gravityO plasma
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suppose a student starts with 2.3621 g of a sand mixture and separates the components into 1.3012 g of n a c l , 0.5560 g of s i o 2 , and 0.4503 g of c a c o 3 . based on the amount of recovered s i o 2 , what is the percent of s i o 2 in the starting mixture?
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2 KCIO3 = 2 KCI + 3 O2If 12.0 grams of potassium chlorate decompose, how many grams of potassium chloride will beproduced? Round your answer to the nearest hundredths.
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the electron configruration of an atom in the ground state is 2-4 the total number if occupied principal energey levels im this atom is
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Is the disaccharide made from a glucose linked to a fructose?
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The giant crushers lifted the boulders and quickly _________ them into a uniform gray powder.
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Multiple choice question
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If a 3.0g sample of ground water contains 1.1 x 10^-5g of arsenic(As), what is the concentration of As in ppm?
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The rate constant for this firstorder reaction is 0.0340 s1 at 400 C.AproductsAfter how many seconds will 17.2% of the reactant remain?=
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Molar mass of Cu(NO)2 = .
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Select all the correct answers.Some chemical reactions absorb energy rather than release it. Which of these phenomena are caused by chemical reactions that absorb energy?A) Plants use sunlight and atmospheric gases make food.B) A person activates a cold pack by hitting it against a surface.C) A rechargeable battery is plugged in to charge.D) Heat is used to separate a compound into its elements.PLEASE BE ACCURATE!! Thank you so much!!:)
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A 0.5191-g sample of an unknown monoprotic acid is dissolved in water and titrated with standardized potassium hydroxide. The equivalence point in the titration is reached after the addition of 29.69 mL of 0.1453 M potassium hydroxide to the sample of the unknown acid. Calculate the molar mass of the acid.? g/mol
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which of the following correctly describes the reaction? responses the decomposition of n2o5 is a zero-order reaction. the decomposition of n 2 o 5 is a zero-order reaction. the decomposition of n2o5 is a first-order reaction. the decomposition of n 2 o 5 is a first-order reaction. the decomposition of n2o5 is a second-order reaction. the decomposition of n 2 o 5 is a second-order reaction. the overall reaction order is 3.
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What is the atom number for He
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a compound with a molar mass of about 42 g/mol contains 85.7% carbon and 14.3% hydrogen by mass. what are the empirical and molecular formulas for this compound?
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if an excess of reducing agent is added, how many moles of diphenylmethanol can be produced from one mole of benzophenone?
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What is the temp range of Hanna pH temp probe?
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What term describes the electrolyte capacity of pyridine, which partially dissociates in water? C5H5NWeak electrolyteNon-electrolyte Strong electrolyte
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Which formula is the mathematical representation of Charless law? Responses V1/T1 = V2/T2 P1/T1 = P2/T2
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Compare and contrast Mechanical weathering and Chemical weathering.Mechanical weathering:1.2.Chemical weathering:1.2.Both:1.2.Thank you!
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Give the two conversion factors you can construct using each pair of units. a. meters and kilometers b. liters and microliters c. seconds and milliseconds.
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Describe 3 ways students dispose of garbage at your school
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The Question:A 1.80 x 104 mg block of metal has the following dimensions: 0.5839 inches by 0.531 inches, by 0.4981 inches. Determine the density of the block in g/cm3 using the following exact conversions: 2.54 cm = 1 in; 1000 mg = 1 g.Use the list of metals below and their respective densities to determine the metal's identity.Given:Titanium= 4.54 g/cm3Zinc= 7.13 g/cm3Tin = 7.31 g/cm3Nickel = 8.9 g/cm3I urgently need help with this
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