Chemistry

what volume of 0.0500 m sodium hydroxide should be added to 250 ml of 0.100 m hcooh to obtain a solution with a ph of 4.50
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how many calcium ions can bind to one edta molecule. in other words, what is the mole ratio? group of answer choices 2 : 1 1 : 2 1 : 1 1 : 3
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Q5. How many atoms of ions are there in 363g of Iron fillings? (Atomic weight of Iron is 55.85 a.m.u) 1.6.71x104 atoms 2. 3.911024 atoms 3. 0.31x1024 atoms 4. 23.71x104 atoms
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the mixing of which pair of reactants will result in a precipitation reaction?23)a)k2so4(aq) hg2(no3)2(aq)b)hcl(aq) ca(oh)2(aq)c)csi(aq) naoh(aq)d)nano3(aq) nh4cl(aq)
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Once alchol is in the bloodstrram it will reach the brain I'm a few
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All atoms of the same element have exactly the same what?
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a mineral contains 675 parent atoms and 225 daughter atoms. if the half life for the radioactive element is 40 million years, how old is the rock?
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a 100.0 ml sample of 0.18 m hclo4 is titrated with 0.27 m lioh. the equivalence points is reached after 66.67 ml of lioh have been added. determine the ph of the solution at the equivalence point.
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if the percent of solute in an aqueous solution is 5%, what is the percentage of water in that solution?
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how many moles of o2 will be released if a liter of blood containing 45 g of hemoglobin is transferred from 60 torr, ph 7.6 to 20 torr, ph 7.2? hemoglobin has a molecular weight of 68,000.
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a certain reaction has an activation energy of 34.34 kj/mol. 34.34 kj / mol. at what kelvin temperature will the reaction proceed 3.00 3.00 times faster than it did at 357 k?
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The acid should be handled with great care why?
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presented with two tubes: one tube with a buffered solution + acid and one tube with water + acid, how will you know which tube has the buffer and which tube does not have the buffer?
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why does the procedure use a graduated cylinder and not simply have you put 2 ml of solution directly into the test tube?
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the decomposition of a generic diatomic element in its standard state is represented by the equation
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what is the force magnitude (in nn) between a positive sodium ion and a negative chloride ion in an ionic nacl crystal if the are 0.5 nm apart?
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which statement is true a-in a reaction, oxidation can occur independently of reduction b-a redox reaction involves either the transfer of an electron or a change in oxidation state of an element c-if any of the reactants or products in a reaction contain oxygen the reaction is a redox reaction d- the reducing agent reduces another substance and is itself oxidized
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a pure titanium cube has an edge length 2.77 in. how many titanium atoms does i contain? titanium does have a density of 4.50 g/cm^3
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a solution of cacl2 cacl 2 in water forms a mixture that is 31.5% 31.5 % calcium chloride by mass. if the total mass of the mixture is 195.4 g, 195.4 g, what masses of cacl2 cacl 2 and water were used?
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calculate the number of vacancies per m^3 for gold at 900 c. the energy for vacancy formation is 0.86 ev/atom
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please can someone help me out with this? i need it very quickly need answer in 4 hours pls help
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when 0.2 moles of hydrofluoric acid are added to 100 ml of water, the resulting solution has a ph equal to 4. what is the percent dissociation of hf?
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1.2.Grams of solute3.4.0600150140130120110100908070605040302010NH37Solubility CurveKCI3FONXNHCO0 10 20 30 40 50KCINaciCe2(SO4)360 70 80 90 100Temperature (C)How many grams of ammonium chloride (NH4Cl) is dissolved at 50C?Which compound is least soluble in water at 10C?How many grams of KNO3 can be dissolved at 50C?Are the following solutions unsaturated, saturated, or supersaturated?a.45g of NaNO3 in 100 g of water at 30C.b. 60g of KClO3 in 100 g of water at 60C.5. How many grams of NaNO3 are required to saturate 100 grams of water at75C?6. At what temperature would 25g of potassium chlorate (KClO3) dissolve?7. 89 g NaNO3 is prepared at 30C.
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a mixture of three gases has a total pressure of 1,380 mmhg at 298 k. the mixture is analyzed and is found to contain 1.27 mol co2, 3.04 mol co, and 1.50 mol ar. what is the partial pressure of ar? multiple choice 0.258 atm 301 mmhg 356 mmhg 5,345 mmhg 8,020 mmhg
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