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Isotopes of elements are atoms of the same element that vary in the: 1,number of electrons associated with the nucleus. 2,number of neutrons in the nucleus. 3,number of atoms in a molecule. 4,number of protons in the nucleus.
how many metric tons of oxygetn are combined in a sample of pitchblende that contains 2.3 t of
A concentrated solution of compound A in the same solvent was diluted from an initial volume of 2.00 ml to a final volume of 25.00 mL and then had an absorbance of 0.733. What is the concentration of A in the concentrated solution
Assume the total heat capacity of the air C air=30 J/K. Describe what's the likely ice will ne after the system reaches equilibrium. b) Estimate theliekly final temperature after reaching equilibrium
Calculate the molarity of an aqueous NaOH solution if 30.10ml of .500M H2SO4 is required to reach the end point when titrated against 10.00mL of NaOH solution.
What is the minimum frequency of light necessary to emit electrons from sodium via the photoelectric effect? What is the wavelength of this light?
Consider all the valence electron pairs of the central atom-both those that are shared in covalent bonds, called bonding pairs, and those that are unshared, called non-bonding pairs or unshared pairs.
The intial temp of the water is 19.0C and the final temp of the system is 25.1C. The heat loss to calorimeter is negligible. What is the mass of the water?
aluminum metal dissolved in hydrochloric acid as follows2als 6hclaq rarr 2alcl3aq 3h2ga. what is the minimum volume
burned in a bomb calorimeter, the temperature of the calorimeter (including its contents) rose by 4.701 °C. What is the heat capacity (calorimeter constant) of the calorimeter?
When the following equation is balanced using the smallest possible integers, what is the exponent of N2O in the reaction quotient expression?
A 739 mL gas sample at STP is compressed to a volume of 244 mL, and the temperature is increased to 24 ?C. What is the new pressure of the gas in Pa?
a volume of 60.0 ml of aqueous potassium hydroxide koh was titrated against a standard solution of sulfuric acid
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