Answer:
CaCO3 + 2HCL -> CO2 +H2O + CaCl2
Explanation:
When balancing an equation, it is important to first ensure that the chemical formulas in the equation are correct. In the above equation, the first modification required is for CaCl to be corrected to CaCl2. This is because the calcium ion has a charge of 2+ which has to be balanced by 2 chloride ions, each of charge 1-
Next, the overall atoms of the equations should be balanced. The number of atoms of each element on the side of reactants should be equal to their number on the side of the products. In this case, the number of HCL molecules should be 2.
Before balancing equation:
Reactants: Ca: 1, C: 1, O: 3, H: 1, Cl: 1
Products: Ca: 1, C: 1, O: 3, H: 2, Cl: 1
After balancing equation:
Reactants: Ca: 1, C: 1, O: 3, H: 2, Cl: 2
Products: Ca: 1, C: 1, O: 3, H: 2, Cl: 2
Answer:
33.21% is the right answer.
Explanation:
0.04720 L * 0.02240 mol / L = 1.0573*10-3
mol Fe+2 = 1.0573* 10-3 mol = 5.2864*10-3
mass of Fe= 5.2864 * 10-3 = 0.29522g
% of Fe in sample = 0.29522 g Fe / 0.8890 g of sample * 100 = 33.21%
The number of moles of MnO4– added to the solution is 0.00106 mol. The moles of Fe2+ in the sample is 0.00530 mol. The grams of iron in the sample is 0.296 g and the percentage of iron in the sample is 33.33%.
The titration reaction between Fe2+ and MnO4– in acid solution is as follows: 5Fe2+ + MnO4– + 8H+ → 5Fe3+ + Mn2+ + 4H2O. Firstly, we can calculate the number of moles of MnO4– added to the solution using the formula volume X molarity. That is 0.0472 L X 0.02240 M = 0.00106 mol MnO4–. According to the balanced redox reaction, one mole of MnO4– reacts with five moles of Fe2+. Therefore, the moles of Fe2+ in the sample is 0.00106 mol MnO4– X 5 = 0.00530 mol Fe2+.
Next, we calculate the grams of iron in the sample. The molarmass of iron is approximately 55.85 g/mol, thus the grams of iron in the sample are 0.00530 mol Fe2+ X 55.85 g/mol = 0.296 g Fe2+. Finally, we find the percentage of iron in the sample by mass = (mass of iron in the sample / total mass of the sample) X 100%. Therefore, the percentage is (0.296 g / 0.8890 g) X 100% = 33.33%.
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Silver and gold are two elements which have properties similar to copper. These common properties include sheen, malleability, ductility, and their ability to conduct heat and electricity, attributable to their similar atomic structures.
Two elements that have properties similar to copper, which is a metal, include silver (Ag) and gold (Au). All these elements fit into the same category - metals, that demonstrate certain characteristics:
These properties stem from their similar atomic structures, placed in the same group on the periodic table.
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Water is considered a universal solvent due to its polar nature, which enables it to dissolve ionic compounds and polar molecules. This is because water's charged particles form hydrogen bonds with surrounding water molecules, creating hydration shells that keep the solute particles dispersed. This unique property allows water to dissolve a variety of substances.
Water is considered a universalsolvent because of its polar nature. Being polar, water has slight positive and negative charges, making it capable of dissolving ionic compounds and polar molecules. These charged particles form hydrogen bonds with water molecules, forming hydration shells that keep the solute particles separated or dispersed in the water. This ability of water to dissolve a wide range of substances makes it a universal solvent.
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b)liquid
c)solid
d)gas
Answer:
The correct, chemically balanced equation for photosynthesis is: b. 6CO2+12H2O+radiant energy -> C6H12O6+ 6H2O+6O2
Explanation:
Photosynthesis is the synthesis of a compound which is more complex than CO2, O2 and H2O. It requires the presence of radiation/sunlight. Therefore, c, d, and e are incorrect. C6H12O6 is produced in the photosynthesis, not decomposed. O2 is generated in the photosynthesis. Analyzing both a and b, the only chemically balanced equation is b. The option a has an excess of carbon that is not reflected on the right side of the equation.