Master Chemistry with Fun Quizzes & Brain Teasers!

Given the reaction that occurs in an electrochemical cell:Zn(s) + CuSO4(aq) ZnSO4(aq) + Cu(s)During this reaction, the oxidation number of Cu changes fromA)0 to +2B)0 to 2C)+2 to 0D)2 to 0
2 Answers
Given the balanced equation representing a reaction:Fe2O3 + 2Al Al2O3 + 2FeDuring this reaction, the oxidation number of Al changes fromA)+3 to 0 as electrons are transferredB)+3 to 0 as protons are transferredC)0 to +3 as electrons are transferredD)0 to +3 as protons are transferred
1 Answer
What is one common reaction to all hydrocarbons?
1 Answer
3 examples of electrochemical cell
1 Answer
What is the purpose of the arrow in a chemical equation?O A.It indicates the direction in which the reaction occurs..It separates the elements from the compounds.O C.It indicates the direction of increase in the number of molecules.D.It indicates the direction of heat movement in a reaction.ResetNext
1 Answer
What is the freezing point of a solution of 210.0 g of glycerol, formula C3H8O3, dissolved in 350. g of water? Careful. First get molar mass and use molar mass to determine molality concentration. Then use freeze pt. depression formula to determine the change in freezing pt. Then determine the new freeze point. The freezing point depression constant for water is Kf= -1.86 oCelcius/molal. Report your answer rounded to 1 decimal point and do not include units.
2 Answers
The solubility of a gas in water is 0.66 g/L at 15 kPa of pressure. What is the solubility when the pressure is increased to 40.0 kPa?
1 Answer
At midday (12pm, Noon), what is happening in the leaf of a plant? A) Cellular RespirationB) PhotosynthesisC) Mainly photosynthesis and some cellular respirationD) None of the above
2 Answers
If you pour 9.0 g of sodium chloride into water to produce 240 mL of solution, what will the molarity be?
1 Answer
0.00056 kg = in metric conversion
2 Answers
If oxygen, which has an electronegativity of 3.5, bonds with hydrogen, whichhas an electronegativity of 2.1, the bond between the two atoms will be classified as a polar BLANKbond.
1 Answer
How many grams of calcium carbonate must be decomposed to produce 5.00 L of carbon dioxide at 901 mmHg and 0'C?
1 Answer
Which of these was not proposed by john dalton in 1805? A. All matter is made of atoms.B. Adams are made of protons, neutrons and electrons.C. During chemical reactions, atoms rearrange themselves.D. The atoms of a particular element are all identical.
1 Answer
Combustion of hydrocarbons such as undecane (C_11H_24) produces carbon dioxide, a "greenhouse gas." Greenhouse gases in the Earth's atmosphere can trap the Sun's heat, raising the average temperature of the Earth. For this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.1. Write a balanced chemical equation, including physical state symbols, for the combustion of liquid undecane into gaseous carbon dioxide and gaseous water.2. Suppose 0.260 kg of undecane are burned in air at a pressure of exactly 1 atm and a temperature of 13.0C. Calculate the volume of carbon dioxide gas that is produced. Be sure your answer has the correct number of significant digits.
1 Answer
There are certain trends with which you should become very familar (recognizing these trends will save you time!) This part of the question is dedicated to that task.a) Whenever you see 9 or a multiple of 9 in the integration ratio, which group should you first consider for being responsible for that signal. b) Whenever you see a quartet and triplet on a spectrum, which group should you first consider for being responsible for those signals? c) Whenever you see septet and a doublet on a spectrum, which group should you first consider for being responsible for those signals? d) Whenever you see 6 or a multiple of 6 in the integration ratio, which group should you first consider for being responsible for that signal e) Whenever you see 3 as the actual number of protons for a given signal, which group should you first consider for being responsible for that signal
1 Answer
True or False questions Please answer the following questions1. Water is released from plants & animalsFalse2.Water contains 2 atoms or oxygen3.Water is found in plants but not in meats4.Water can dissolve many substances
1 Answer
Given the equation for a system at equilibrium:N2(g) + 3H2(g) 2NH3(g) + energyIf only the concentration of N2(g) is increased, the concentration of1. NH3(g) increases2. NH3(g) remains the same3. H2(g) increases4. H2(g) remains the same
1 Answer
What is kinetic energy (KE)A. energy an object has because of its positionB. energy an object has because of its heightC. energy an object has because of its directionD. energy an object has because it is moving
2 Answers
How long does it take light from the sun to reach Earth?8 minutes 20 secondsit's instant7 years 20 daysabout an hour
2 Answers
In Universe L, recently discovered by an intrepid team of chemists who also happen to have studied interdimensional travel, quantum mechanics works just as it does in our universe, except that there are six d orbitals instead of the usual number we observe here. Use these facts to write the ground-state electron configurations of the fifth and sixth elements in the first transition series in Universe L. Note: you may use to stand for the electron configuration of the noble gas at the end of the row before the first transition series. fifth transition metal: sixth transition metal:
1 Answer
Earth revolving around the sun, you walking down the street, and molecules moving in space all haveA. Potential energyB. Kinetic energy
1 Answer
A sample of grape juice has a hydroxide ion concentration of 1.4 10-10 M. Which of these equations will you use to find the hydronium ion concentration?
1 Answer
Which step is this ?prophase I, Anaphase I, prophase II, Anaphase II
2 Answers
2 SO + O 2 SO + energy This reaction would be considered
1 Answer