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An element has 25 protons in its nucleus.
(a) Is the element a metal, a nonmetal, or a metalloid?
(b) On the basis of the average atomic mass, write the symbol for the element's most abundant isotope.
(c) How many neutrons are in the isotope you described in part (b)?
(d) How many electrons are in atoms of this element?
(e) How many times heavier than 12C is the average atom of this element?
Write the molecular equation, complete ionic equation and net ionic equation for the following reactions:
what minimum requirement is needed to obtain reproducible results with a single beam spectrophotometer
the specific heat of an unknown metal is found to be 0.233 j kg. The law of dulong and petit predicts a molar heat capacity of J/K mol. Use this law to estimate the molar mass of the element.
A gaseous fuel mixture stored at 744mmHg and 298 K contains only methane and propane. When 13.0L of this fuel mixture is burned, it produces 769kJ of heat. What is the mole fraction of methane in the mixture?
determine the total amount of heat absorbed by 100.0 grams of water at its boiling point 100 celsuis to chang from
Write out the balanced chemical equation that occurs when silver tarnishes in the presence of hydrogen sulfide ( a gas produced in food decay) and oxygen. Water is a by-product. Into which class of reactions does this reaction belong
Would a solution that has a molarity of 0.990 M KNO3 and a density of 0.988 g/mL be considered unsaturated, saturated, or supersaturated?
A helium-filled weather balloon has a volume of 2.4 × 102 L at 99 kPa pressure and a temperature of 0°C. What is the mass of the helium in the balloon?
Following the equation for the combustion of 2C3H6O+8O2----->6CO2+6H2O+853.6 kcal. How much heat will be given off if 0.48 mol of acetone is burned completely?
What volume of a 1.0 M KI solution must be added to 100.0 mL of a solution that is 0.15M in Pb2+ ion to precipitate all the lead ion. What mass of PbI2 should precipitate
A n experiment to extract an acidic and neutral compound from an unknown compound. The compound is dissolved in diethyl ether and transferred to a separatory funnel. The NaOH (aq) is then added to the separatory funnel and the salt of the acid is dra..
A solution is prepared by mixing 50.0 mL of 0.29 M Pb(NO3)2 with 50.0 mL of 1.9 M KCl. Calculate the concentrations of Pb2+ and Cl. at equilibrium. Ksp for PbCl2(s) is 1.6 x10-5.
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