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1. Calcium carbonate and sand mixture with weight of 4 grams is reacted with excees of HCl results in the production of carbon dioxide then find out the percent of calcium carbonate in the original mixture?
2. observe and answer if an unknown compound is noticed to melt at the temperature of 111 degree Celsius with a gas evolution and solidify it, this compound doesn't melt until it reaches at 155 degree Celsius temperature then explain at what time melting of this compound takes place again?
A mixture of table salt and ice is used to chill the contents of hand-operated ice-cream makers. What is the melting point of a mixture of 2.00 lb of NaCl and 12.00 pounds of ice if exactly half of the ice melts?
What is the wavelength of light having a frequency of 5.4 x 10^13 Hz? What is the frequency (in Hz) oflight having a wavelength of 8.26 x10^2 nm?
how many grams of copper hydroxide can be prepared from 2.7 g of copper(II)nitrate and excess sodium hydroxide?
THF followed by basic peroxide and then acid. Give thpse three products; use arrows demonstrating electron movement to show details of the reactions, including the peroxide cleavage of the B-C bond.
Calculate the pH for an aqueous solution of acetic acid that contains 2.15x10^-3M hydronium ion.
She found that 0.3127 g of Na2CO3 was needed to completely react with 25.00 mL of the HCl solution. What is the concentration of the HCl solution in M (mol/L)
Explain this theary and how the shapes of simple molecules and polyatomic ions can be worked out using it. you will need to illustrate your account with a number of diagrams, in particular showing the difference typical shapes of simple molecules ..
When 0.549 moles of a certain gas fill a balloon the volume is 75 mL. If enough of the same gas is added to the balloon until 1.44 moles of gas are present, what is the new volume of the balloon?
Why do you think the enthalpy of activation, H ‡ , for a syn-periplanar elimination is higher than that for an anti-periplanar elimination
232.5 ml of 0.0384 M aqueous manganese(III) oxide solution reacts with 1.058 g of solid octahedral sulfur (S8) and the water to give sulfurous acid and a manganese(II) oxide precipitate. You may assume no volume changes in the reaction from soluti..
Balance the following equation in basic solution. indicate which reactant becomes oxidized during the reaction, which reactant becomes reduced
Air contains nitrogen, oxygen, argon, and trace gases. if the partial pressure of nitrogen is 587 mm Hg, Oxygen is 158 mm Hg, argon is 7 mm Hg, and trace gas pressure is negligible, what is the atmospheric pressure?
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