Master Chemistry with Fun Quizzes & Brain Teasers!

A rigid 11.7 L sealed vessel containing 3.3 mol O2(g), 1.6 mol CH4(g) and 2.3 mol of He(g)has an internal temperature of 78oC.a. Calculate the partial pressure of each gas.b. What is the total pressure in the vessel?c. Find the mole fraction of each gas in the vessel.d. A lab technician ignites the mist in the flask and the methane gas combusts in oxygento form carbon dioxide and water. Find the mole fraction of each gas in the mixtureafter the reaction.
1 Answer
Write the symbol and electron configuration for each ion and name the noble gas with the same configuration.a. nitrideb. oxidec. sulfided. bromide
1 Answer
If chemical signals in the cytoplasm control the progression of a cell to the M phase of the cell cycle, then fusion of a cell in G1 with a cell in early M phase would most likely result in the ___condensation of chromatin in preparation of nuclear division in both cells.
1 Answer
Na+1 and S-2 what ionic formula is this
1 Answer
What is the frequency of a wave that has a wavelength of 10.5x10-10O-18OOO3.5 102.85714286 107-436.9573 100.105AS
1 Answer
what is relative abundance isotopes
1 Answer
the movements of ions or molecules across a semi-permanent membrane via active transport is biologically critical. please explain the principle of active transport. then, please provide three specific and detailed examples that involve active transport at three different levels of analysis in living organisms. in each example, please be specific as to what substances are moving, from where and to where they are moving, and the biological function that is being served by this process.
1 Answer
Which of the following transitions of a single electron would require the absorption of a photon of light with the shortest wavelength? O n-1ton-4 On-2 ton=4 On-3 to n 2 On 5ton 1 On-3 to n 5
1 Answer
Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 J of heat? Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 J of heat? 25.0 g Ag, CAg = 0.235 J/gC 50.0 g Al, CAl = 0.903 J/gC 50.0 g Cu, CCu = 0.385 J/gC 25.0 g Au, CAu = 0.128 J/gC 25.0 g granite, Cgranite = 0.79 J/gC
1 Answer
A liquid solution that contains a nonvolatile solute has a higher boiling point than the solvent alone. Select one: True False
1 Answer
Calculate the molarity of each solution.A) 38.2 g of KCl in 0.945 L of solutionExpress your answer using three significant figures.B) 64.3 g of C2H6O in 3.8 L of solutionExpress your answer using two significant figures.C) 36.2 mg of KI in 106 mL of solutionExpress your answer using three significant figures.
1 Answer
when lead combines with hydrogen to form lead (iv) hydride, pbh4 (aka plumbane) 9 is being oxidized and is the oxidizing agent
1 Answer
structure of quartzeach Si atom is in a tetrahedron surrounded by four O atoms and each O atom is a bridge connecting the corners of two tetrahedrons.
1 Answer
The molecule 2-butene is able to undergo a process called cis-trans isomerization, where the molecule switches from being a cis-alkene to a trans-alkene. This transformation can be induced by light. H H3C light XX C: ___H3C CH3 ____H CH3 What is the hybridization of the two central carbon atoms in 2-butene? O sp O sp2 O sp3 The isomerization requires breaking the a bond. Use the table of bond energies to determine the approximate amount of energy (in joules) required to break the C-C a bond in 2-butene, both per mole and per molecule.E= J/mol E = J/moleculeWhat is the wavelength of light that would be required to perform the cis-trans isomerization of one molecule of 2-butene? = nm nm Which region of the electromagnetic spectrum is this wavelength of light within? O visible O ultaviolet O X-ray O infrared
1 Answer
Imagine that the reaction in model 1 starts with 100 molecules of A and zero molecules of B. explain why the concentration of substance A will never reach zero.
1 Answer
in a set of experiments on a hypothetical one-electron atom, you measure the wavelengths of the photons emitted from transitions ending in the ground level (nn
1 Answer
Two students determine the percentage of lead in a sample as a laboratory exercise. The true percentage is 22.52%. The students results for three determinations are as follows: (1) 22.52, 22.48, 22.54 (2) 22.64, 22.58, 22.62 Calculate the average percentage for each set of data and state which set is the more accurate based on the average
1 Answer
Which of the following is an observation of a chemical property?Ozinc reacts with hydrochloric acidOO water boils at 100C.Osand paper is roughly textureddensity of wood is 0.51 g/cm
1 Answer
Which of the following characteristics was NOT included in Dmitri Mendeleev's periodic table?O distribution of elements determined by electron configurationO heavier elements placed in rows closer to the bottom of the tableO elements arranged by increasing atomic massO elements placed in columns based on chemical properties
1 Answer
when circuit town electronics sets its televisions at three price levels of $699, $899, and $1,099, it is most likely using .
1 Answer
The Lewis structure for PF3 shows that the central phosphorus atom has _______ nonbonding and ________ bonding electron pairs. Answer a. 3, 1 b. 1, 3 c. 3, 3 d. 1, 2 e. 2, 2
1 Answer
ali folled a ball down the hill the praph on the next page shows the kietic and potential energy of moving ball
1 Answer
Arrange the following electron carriers in the electron transport chain, based on their standard reduction potentials.Cytochrome a3 (Fe3+) + e- Cytochrome a3 (Fe2+) Eo (volts) = 0.35Ubiquinone + 2H+ + 2e- Ubiquinone H2 Eo (volts) = 0.10Cytochrome a (Fe3+) + e- Cytochrome a (Fe2+) Eo (volts) = 0.29Cytochrome c (Fe3+) + e- Cytochrome c (Fe2+) Eo (volts) = 0.25 ubiquinone - cytochrome c- cytochrome a- cytochrome a3cytochrome a3 - cytochrome a - cytochrome c - ubiquinoneubiquinone - cytochrome a - cytochrome a3 - cytochrome ccytochrome c - ubiquinone - cytochrome a - cytochrome a3The binding of a positive allosteric regulator molecule will
1 Answer
a valid lewis structure of cannot be drawn without violating the octet rule. group of answer choices nf3 so42- pf3 sbf3 if3
1 Answer