Chemistry Questions and Answers
Aluminum reacts with oxygen in the following chemical reaction: Al + O2 → Al2O3. How many moles of Al2O3 are formed from the reaction of 6.38 mol O2 and 9.15 mol of Al?
Write the symbol for a cation and an anion that are isoelectronic with Krypton. Is it possible for a cation to be isoelectronic with an anion from the same period? Explain.
Vanadium (V) oxide is used as catalyst in the reaction below.2 SO2 (g) + O2 (g) ---> 2 SO3 (g) Explain how Vanadium (V) oxide is able to reduce activation energy and to increase the rate of the reaction.
. How is the completeness of separation of the benzoic acid from sodium chloride known with the addition of AgNO3 solution? the experiment was about crystallization. this question is based on the test for the completeness of the separation: i dissolved a small amount of the crystals which is formed from benzoic acid, in 1 ml hot distilled water in a test tube and added 1 drop of 1% AgNO3.
Suppose you want to make 100 grams of water. How much hydrogen and Oxygen would you need to make 100 grams of water with nothing left over. Explain.
Why is nitrogen monoxide, NO, formed in a car engine? Explain briefly why the presence of nitrogen oxides in air is polluting?
What is the concentration of a solution that has a volume of 2.5 L and contains 660 grams of calcium phosphate?
What is the purpose of Chromatography? objective,what is the purpose doing lab experiment for Chromatography?
What does the red glow indicate in the following experiment: A student heated a mixture of iron filings & sulfur strongly. He saw a red glow spread through the mixture as the reaction continued. At the end of the experiment a black solid had been formed.
Methanamide, HCONH2, is a planar molecule. All the bond angles in the molecule are approximately 120 degree.The C-N bond length measured is about half way between that typical for C-N single bonds and C=N double bonds.
An alloy contains copper and zinc. Some of the zinc has become oxidized to zinc oxide. What is the result of adding an excess of dilute sulfuric acid to the alloy? 1. A blue solution and a white solid remains. 2. A colorless solution and a pink / brown solid remains. 3. The alloy dissolves completely to give a blue solution. 4. The alloy dissolves completely to give a colorless solution.
Determine the empirical formula of an oxide of silicon from the following: Mass of crucible = 18.20 g, mass of crucible + silicon = 18.48 g and mass of crucible + oxide of silicon = 18.80 g.
What color is CuCrO4 (or what it decomposes into) as a precipitate when aqueous potassium chromate and aqueous copper sulfate are reacted?
Given 4K(s) + O2(g) ---> 2K2O(s), how many grams of K2O(s) can be produced if 3.91 grams of K(s) are allowed to react with 1.60 grams of O2(g)?
What is the concentration of a solution with a volume of 9 mL that contains 2 grams of iron (III) hydroxide?
Convert the following word equation into a balanced symbol equation: Copper(2) carbonate + hydrochloric acid---> copper chloride + water + carbon dioxide
Calculate the concentration of each ion in the following solutions:0.15 M (NH4)2SO4(aq)? when 30.0 grams of CaBr2(s) are dissolved in 150.mL of solution? when 200 mL of 0.120 M NaCl(aq) are added to 300 mL of 0.100 M Na2SO4(aq)?
What is the formula for converting grams to atoms or atoms to grams? How many atoms are in 878g of fluorine?
When zinc sulfide is heated in the presence of oxygen the following reaction occurs: ZnS + O2 → ZnO + SO2. If 1.72 mol of ZnS is heated in the presence of 3.04 mol of O2, which reactant will be the limiting reactant?
What is the concentration of hydrogen ions in 0.05 mole/dm^3 sulfuric acid? A) 0.025 g/dm^3 B) 0.05 g/dm^3 C) 0.10 g/dm^3 D) 2.0 g/dm^3
What's the Noble Gas & Electron configuration of the element Palladium? I'm doing a powerpoint on this element. I did the electron configuration but I'm not sure if is right: 1s2 , 2s2, 2p6, 3s2, 3p6, 4s2, 4d10, 4p6, 5s2, 5d8 And I need the noble gas configuration.
A 0.0560-g sample of acetic acid is added to enough water to make 50.00 mL of solution. How do you calculate [H], [CH3COO-], [CH3COOH] and the pH? The pH is at equilibrium and Ka for acetic acid is 1.8x10^-5
A sodium chloride IV fluid contains 154 mEq of Na+ per liter of solution. If a patient receives exactly 500 mL of the IV, how many moles of Na are given?
A compound contains 20.1% hydrogen and 79.9% carbon by mass. Calculate the empirical formula for this compound.
Explain why ionic compounds are formed when a metal bonds with a nonmetal, but covalent compounds are formed when two nonmetals bond.
My teacher asked me to write a theory and discussion about an acid base titration. The procedure is: pipette 10 ml of NaOH solution (0.152 N) and transfer it to a cynical flask, add 2 drops of methyl red indicator (yellow colors). I used 15.2 ml of HCl and the solution color changed to purple.
A Nitrogen and Oxygen compound contains 4.2 g of Nitrogen and 12 g of Oxygen. Find the empirical formula. If the molar mass is 756 g per mol, what is the molecular formula?
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