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Write the molecular formula of glycine, an amino acid present in proteins.
What is the difference between inorganic compounds and organic compounds?
The following table gives the number of electrons, protons, and neutrons in atoms or ions of four elements, identified only as A, B, C, and D. Write the isotopic symbol for each element.
Define, with two examples, the following terms: (a) alkali metals, (b) alkaline earth metal, (c) halogens, and (d) noble gases.
Explain with appropriate illustriation the concept of Resonance stabilization of propan-2-one
(a) If each sphere represents 1.0 x 10^-3 mol of ion, will the equivalence point have been reached when all of B has been added to A?(b) What is the molarity of B?(c) What additional volume (mL) of
Find appropriate ligands (aromatic with two Nitrogen functionalgroups) to bind Fe (NO) 2(CO)2in the form of Dintrosyle Ironcomplexes.
How many kcal are needed to change 5.00 g of water at 25.0 degrees celsius to steam at 100.0 degrees celsius? the molar heat of vaporization is 9.71 kcal/mol.
A calorimeter containing 150 g of water at 23.0 degrees celsius and the temperature of the calorimeter rose to 35.60 degrees celsius. what would be the heat capacity of the calorimeter?
Adding heat to tap water causes the dissolved oxygen to leave. Which of the two equations below represents a chemical reaction, and which does not?
Write a net ionic equation for each of these two reactions. What ion replaces the Ca2+(aq) and Mg2+(aq) ions in the water?
Write a net ionic equation for the precipitation reaction, if any, that occurs when aqueous solutions of the following ionic compounds are mixed.
Write a balanced equation for each of the following double-displacement reactions. Include states: Aqueous solutions of chromium (III) iodide and sodium hydroxide react to give aqueous sodium iodide.
Which of the following is evidence for a chemical reaction? Heating purple iodine crystals produces a purple gas. Dropping sodium metal into water produces fizzing.
What is the empirical formula? If the molar mass of the chlorine oxide is 356.7 g/mol, what is the molecular formula of the compound?
Some calcium supplements contain calcium citrate, Ca3(C6H5O7)2, and others contain calcium carbonate, CaCO3. Which compound has the higher mass percent of calcium?
If you have 44.6 g of carbon tetrachloride, how many atoms of chlorine do you have? How many grams of sulfur hexafluoride would you need to have 5.25 x 1024 fluorine atoms?
Write at least three of them. How many moles of Al atoms are needed to combine with 0.565 mol of O atoms to make aluminum oxide, Al2O3?
How to balance the chemical equation of aluminum and hydrochloric acid?
Calculate the molar mass for each of the following: calcium sulfide, CaS. For element X, 59.8 g corresponds to 2.6 moles. What is the atomic mass of the element?
Calculate the number of particles in each of the following: 0.125 mole zinc atoms, Zn 0.125mole zn/ 1 mole x 65.39 zn = 8.17375 or 81.74 g zinc.
How many years are there in 1 mole of seconds? Use conversion factors, and show which units cancel. 6.022 x 10^23 sec x 1 min/60 sec/ 1 hr/60 min/1 day/24 hr/1 yr/365 days = 6.022 x 10 ^23 sec 1.004
Calculate the change in enthalpy when 52.0 g of solid chromium at 25 degrees celcius and 1 atm pressure is oxidized. (delta h for Cr2O3(s) is -1135 kJ/mol.)
A room contains 3.9 x 10^4 grams of argon. If air has a density of 1.7 g/L and is 0.255% argon by mass, what is the size of the room?
A solution is made by dissolving 25.5 grams of glucose (C6H12O6) in 398 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m? Show a