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The time required for one-half of the atoms of a radioactive nuclei sample to decay is called the ________ of the nuclei.
The type of nuclear reaction shown below is _____________ which can be recognized by the fact that it has 2 reactant and 2 products.
The nuclear symbol of the missing material is: ______________
27Al13 + ? -> 30P15 + 1n0
Explain what happens to the atomic number of a nucleus when positron emission occurs
The standard enthalpy of formation of the metallocene bis(benzene)chromium was measured in a calorimeter. It was found for the reaction Cr(C6H6)2(s) → Cr(s) + 2 C6H6(g)
An 18.0-g sample of magnesium is completely burned in the presence of air to form magnesium oxide. What is the mass of the magnesium oxide obtained?
the pH of a neutral solution is 7.83. What is the value of Kw at that temperature?
What mass of oxygen gas is required in order to release 6670 kJ of heat to the surroundings by the following reaction
Estimate the age of a bottled wine that has a tritium, 3^H, content 65.% that of freshly bottled wine. Tritium decays by beta decay and has a half life of 12.3 yr.
solution has a transmittance of 0.309 in a 1.00 cm cell at 520 nm. Calculate the molar absorptivity of the solution.
What is the lead ion concentration in a saturated lead(II)chloride solution made by adding solid PbCl2
A 100.0-L flask contains a mixture of NO2 gas and CO gas. If the concentration of NO2 is 5.5 × 105 ppm, and the total pressure is 790 torr, what is the partial pressure of CO in the flask?
Ammonia can be made by reacting calcium cyanamide (CaCN2) with water as shown: CaCN2 + 3 H2O => CaCO3 + 2 NH3. How many grams of water are required to react with 212.9 g of calcium cyanamide
Al(OH)4-(aq) → AlO2-(aq) + 2 H2O(l) What is the oxidizing agent? What is the reducing agent? What is the substance being oxidized?
Two vessels are labeled A and B. Vessel A contains NH3 gas at 73 degrees C and vessel B contains Ne gas at the same temperature. If the average kinetic energy of NH3 is 7.1 10-21 J/molecule at 70 degrees C.
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