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Matt did an experiment to study the solubility of two substances. He poured 100 mL of water at 20 °C into each of two beakers labeled A and B. He put 50 g of Substance A in the beaker labeled A and 5
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The gas in the piston is being heated, and the piston has moved upward. The observation will be summarized in a row of the incomplete table below. Row : 1, 2, 3, 4 Name:Boyle's law, Charles’s law,
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Radical chlorination of ethylcyclopropane produces all possible monochlorinated products. how many constitutional isomers are formed?
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A specimen of copper having a rectangular cross section 15.2 mm × 19.1 mm (0.60 in. × 0.75 in.) is pulled in tension with 44,500 n (10,000 lbf) force, producing only elastic deformation. calculate t
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Write a hypothesis for part 1 of the lab,which is about the effect on an object being carried by a car,when the car experiences a sudden impact. ise the format of "if... then... because..." and be sur
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Write a paragraph explaining IN DETAIL how plants make their own food. Remember to write in complete sentences and explain your thoughts in detail.
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The ph of gastric juice in the stomach of a certain individual is 1.00. after a few aspirin tablets have been swallowed, the concentration of acetylsalicylic acid in the stomach is 0.400 m. calculate
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Projectile proton with a speed of 1000 m/s collides elastically with a target proton initially at rest. the two protons then move along perpendicular paths, with the projectile path at 38° from the o
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For trial 1 of an equilibrium reaction, 4 ml of 0.0007 mol/l fe(no3)3 is combined with 1 ml of 0.0004 mol/l kscn and 4 ml of 0.65 mol/l hno3. the solvent for the metal and ligand solutions is 0.65 mol
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Consider a lead-tin alloy that has the composition 20wt% pb – 80wt% sn. the temperature is 180°c. (i) what (mass) fraction of the alloy is in the phase, and what fraction is in the phase? (
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G [reftech] a refrigerator operates at steady state with a coefficient of performance of 4.5 and a power input of 0.8 kw. energy is rejected from the refrigerator to the surroundings at 20 oc by heat
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Chlorine gas reacts with fluorine gas to form chlorine trifluoride. cl2(g)+3f2(g)→2clf3(g) a 1.90 l reaction vessel, initially at 298 k, contains chlorine gas at a partial pressure of 337 mmhg and f
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A thin circular sheet of glass of diameter 7 meters is rubbed with a cloth on one surface, and becomes charged uniformly. a chloride ion (a chlorine atom which has gained one extra electron) passes ne
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A factory at a low elevation ships bags of popcorn to cities at high elevations. Why does the factory manager need to monitor the amount of air in each bag? Too few molecules can cause the bag to coll
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Worth 20 pt plz answerwhy are the oldest parts of the ocean floor no older than about 200 million years old
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The half-life of Zn-71 is 2.4 minutes. if one had 100.0 grams at the beginning, how many grams would be left after 7.2 minutes has elapsed?
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BasedonReferenceTableJ,whichtworeactants react spontaneously? (1) Mg(s) + ZnCl2(aq) (3) Pb(s) + ZnCl2(aq) (2) Cu(s) + FeSO4(aq) (4) Co(s) + NaCl(aq)
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Which evidence recorded at seismic stations following an earthquake supports the inference that Earth’s interior changes from solid rock to molten iron and nickel at the mantle-core boundary?
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Explain how copper replace hydrogen in this reaction although copper comes after hydrogen in chemical activity series ( by chemical equations) Cu + 4HNO₃ ⇒ Cu(NO₃)₂ + 2NO₂ + 2H₂O It's an o
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Is used in many home smoke alarms. if 10% of the americium in a smoke detector decays in 180 years, what is the half-life of this isotope?
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25cm^3 of a solution of X2O5 of concentration 0.100 mol/dm^3 is reduced by sulphur dioxide to a lower oxidation state. To reoxidise X to its original oxidation number required 50cm^3 of 0.02 mol/dm^3
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Human blood has a molar concentration of solutes of 0.30 m. what is the osmotic pressure of blood at 25°c? (r = 0.08206 l • atm/k • mol)
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Which concept describes the formation of four equivalent, single, covalent bonds by carbon in its compounds that resembles methane, ch4?
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Which atom in the ground state has the same electron configuration as a calcium ion in the ground state
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This unit discusses in detail the role of catalysts to lower the activation energy of reactions. The term catalyst appears in nonscientific discussions to refer to something that provokes or speeds si
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Chemistry please help I'm confused I don't understand how fe2+ ionic radius is less than ca2+. How is Fe2+ a smaller ion when it clearly has more electrons than ca2+ as shown in periodic table.
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Which of the following statements is true about the decomposition of a simple binary compound? The product could be an ionic or a molecular compound. The products are predictable. The reactants are t
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A 1 kg block of copper is hammered into a thin sheet. The length of the cooper sheet is 30 cm. What is the mass of the copper sheet
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Differentiate between various qualities of reagents including ordinary,analar and industrial quality reagents.
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Calculate the final temperature of a gas if 25.0 l of the gas at 25 degrees c and 1.00 atm is compressed into a volume of 2.50 l at a pressure of 5.0 atm. you must show all work to receive credit.
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Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in which n=2 to an orbital in which n=7. express the wavelength in nanometers to t
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Look at the resistor illustrated in the figure above.based on your knowledge of the resistor color code, what are the resistance value and tolerance of this resistor?A. 1.5k B. 2.7k
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Which of the following statements best describe how enzymes differ from ordinary chemical catalysts? A) Enzymes are inorganic in nature. B) Enzymes catalyze select chemical reactions. C) Enzymes bind
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When methanol is dissolved in water a non conducting solution results. when acetic acid dissolves in water, the solution is weakly conducting and acidic in nature. describe what happens upon dissoluti
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What mass of calcium can be produced by this process if a current of 6700 a is applied for 39 h ? assume that the electrolytic cell is 73 % efficient.what is the minimum voltage needed to cause the el
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It is required to make 14 grams of certain chemical compound called z. this is made from compounds w, x, and y in the ratio of 2:1:3. the compound y is itself made from w and x. to make 6 grams of y r
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An alpha particle (which is a helium nucleus, q=+2e, m=6.64×10−27kg) is emitted in a radioactive decay with ke = 5.63 mev .
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A 30.62 gram sample of chromium is heated in the presence of excess oxygen. a metal oxide is formed with a mass of 44.75 g. determine the empirical formula of the metal oxide.
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how can one convert 4.95×1022 atoms of zinc into grams?Many students experience difficulties in converting the atoms into grams. It is possible to convert the number of atoms into grams. This tutoria
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Niobium is an element whose density is 8.55 g/cm3 and atomic weight is 93. It crystallizes in body-body-centered structure. With this information, calculate the atomic radius of niobium atom.The quest
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When the following equation is balanced, the coefficient in front of HCl is: Ba(s) + HCl(aq)→BaCl2(aq) + H2(g) Question 4 options: 6 1 3 2
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Quartzite and marble can look very similar. Why do you think artists carve sculptures out of marble more often then quartzite?
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A watershed, or drainage basin, is a region of land where rain or snow drains downhill into a body of water, such as a river, lake, sea, ocean or wetland. The water in drainage basins is most likely u
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PLEASE HELP 22 POINTS How does heat differ from temperature? Temperature is the measure of heat. Temperature and heat are the same thing. Temperature measures thermal energy, and heat is the flow of t
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NEED HELP PLEASE I AM GOING TO FAIL A chemical reaction has an increase in entropy and a decrease in enthalpy. What is known about the spontaneity of the reaction? spontaneous at high temperatures, no
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Two ideal gases have the same mass density and the same absolute pressure. one of the gases is helium (he), and its temperature is 181 k. the other gas is neon (ne). what is the temperature of the neo
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The boiling point of an aqueous solution is 102.30 °c. what is the freezing point? constants can be found here.
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If you know the half-life of a radioactive isotope that occurs in an igneous rock, what must you measure to determine the age of the rock?
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How long would it take to obtain a carbon concentration of 0.75 wt% at a position 0.5 mm below the surface if the heat treatment were conducted at 725 ∘c ?
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For these expressions, energies are expressed in electron volts (ev) per na+–cl– pair, and r is the distance in nanometers (nm). the net energy en is just the sum of the preceding two expressions.
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