Chemistry concepts and calculations
117302 questions • Page 2002 / 2347
When liquid is heated and evaporated, some of the heating goes towards working (
When liquid is heated and evaporated, some of the heating goes towards working (since the specific volume changes), while the remainder goes towards increasing the internal energy…
When looking for candidates you often want to have people with direct experience
When looking for candidates you often want to have people with direct experience with the technologies and platforms you are using today. However, that may not always be a possibi…
When magnesium metal is added to a beaker of HCl (aq), a gas is produced. a) Kno
When magnesium metal is added to a beaker of HCl (aq), a gas is produced. a) Knowing that magnesium is oxidized and that hydrogen is reduced, write the balanced equation for the r…
When magnesium metal is added to a beaker of HCl (aq), a gas is produced. a) Kno
When magnesium metal is added to a beaker of HCl (aq), a gas is produced. a) Knowing that magnesium is oxidized and that hydrogen is reduced, write the balanced equation for the r…
When magnesium metal is added to a beaker of HCl (aq), a gas is produced. a) Kno
When magnesium metal is added to a beaker of HCl (aq), a gas is produced. a) Knowing that magnesium is oxidized and that hydrogen is reduced, write the balanced equation for the r…
When mailing or chatting with people, it had crossed my mind, what if, for simpl
When mailing or chatting with people, it had crossed my mind, what if, for simple communication, someone would use an older encryption method (i.e., ENIGMA), to encrypt their mess…
When making a geologic map and cross-section, a legend should always be included
When making a geologic map and cross-section, a legend should always be included so that readers know the name/rock type and relative age of each unit included on the map. When ma…
When making a geologic map and cross-section, a legend should always be included
When making a geologic map and cross-section, a legend should always be included so that readers know the name/rock type and relative age of each unit included on the map. When ma…
When making comparative absorbance measurements would it bebetter to select a wa
When making comparative absorbance measurements would it bebetter to select a wavelength corresponding to the peak of anabsorption band, the side of a band, or a valley between tw…
When making small amounts of solutions, it is often convenient to tare or weigh
When making small amounts of solutions, it is often convenient to tare or weigh an empty tube, add a “pinch” of solid reagent, re-weigh the tube, and calculate the volume of solve…
When making the sucrose solution in Part A you measure the correct amount of suc
When making the sucrose solution in Part A you measure the correct amount of sucrose on the scale. However, some of the sucrose was spilled on the balance and not into the beaker.…
When making the sucrose solution in Part A you measure the correct amount of suc
When making the sucrose solution in Part A you measure the correct amount of sucrose on the scale. However, some of the sucrose was spilled on the balance and not into the beaker.…
When making the sucrose solution in Part A you measure the correct amount of suc
When making the sucrose solution in Part A you measure the correct amount of sucrose on the scale. However, some of the sucrose was spilled on the balance and not into the beaker.…
When making very large dilutions (over 1000X), it is common for one to make an i
When making very large dilutions (over 1000X), it is common for one to make an intermediate dilution, then to prepare the final dilution from the intermediate. To conserve reagent…
When managing an open source project (using a service like GitHub) how would one
When managing an open source project (using a service like GitHub) how would one respond to the following: Somebody has kindly submitted a patch to add a new feature or address a …
When many atoms combine to form ionic compounds the reaction is highly exothermi
When many atoms combine to form ionic compounds the reaction is highly exothermic. Where is most of this energy coming from? The energy released when the ions combine to form the …
When measured with a F^- ion-selective electrode with a Nernstian response at 25
When measured with a F^- ion-selective electrode with a Nernstian response at 25 degree C, the potential due to F^- in unfluoridated groundwater in a nearby city was 40.7 mV more …
When measuring chemicals, you use a balance that can read to the nearest 0.1 gra
When measuring chemicals, you use a balance that can read to the nearest 0.1 gram. A procedure says to measure a 5.0 gram increment of a salt. Which of the following could be the …
When measuring the flask, some water spilled. This caused the volume of the flas
When measuring the flask, some water spilled. This caused the volume of the flask to be recorded as 8.5 mL too low Too low. Volume and mol are directly related. As V decreases, n …
When measuring the volumes of Fe(NO3)3 and NaSCN solutions in this experiment, t
When measuring the volumes of Fe(NO3)3 and NaSCN solutions in this experiment, the student mistakenly used a graduated cylinder instead of volumtetric pipets, After collecting all…
When measuring the volumes of Fe(NO3)3 and NaSCN solutions in this experiment, t
When measuring the volumes of Fe(NO3)3 and NaSCN solutions in this experiment, the student mistakenly used a graduated cylinder instead of volumtetric pipets, After collecting all…
When metal A is placed in a solution of metal ions B2+, a reaction occurs betwee
When metal A is placed in a solution of metal ions B2+, a reaction occurs between A and B2+, and metal ions A2+ appear in the solution. When metal B is placed in acid solution, ga…
When metal A is placed in a solution of metal ions B2+, a reaction occurs betwee
When metal A is placed in a solution of metal ions B2+, a reaction occurs between A and B2+, and metal ions A2+ appear in the solution. When metal B is placed in acid solution, ga…
When methane (CH4) burns, it reacts with oxygen gas to produce carbon dioxide an
When methane (CH4) burns, it reacts with oxygen gas to produce carbon dioxide and water. The unbalanced equation for this reaction is CH4(g) + 02(g) rightarrow C02(g) + H20(g) Thi…
When methane (CH4) burns, it reacts with oxygen gas to produce carbon dioxide an
When methane (CH4) burns, it reacts with oxygen gas to produce carbon dioxide and water. The unbalanced equation for this reaction is CH4(g)+O2(g)CO2(g)+H2O(g) This type of reacti…
When methane is burned with oxygen, the products are carbon dioxide and water. I
When methane is burned with oxygen, the products are carbon dioxide and water. If you produce 18 grams of water from 8 grams of methane and 32 grams of oxygen, how many grams of c…
When methane is burned with oxygen, the products are carbon dioxide and water. I
When methane is burned with oxygen, the products are carbon dioxide and water. If you produce 18 grams of water from 8 grams of methane and 32 grams of oxygen, how many grams of c…
When methanol, CH3OH, is burned in the presence of oxygen gas, O2, a large amoun
When methanol, CH3OH, is burned in the presence of oxygen gas, O2, a large amount of heat energy is released, as shown in the combustion reaction below. The amount of energy relea…
When microorganisms reproduce, they release waste products that may change the p
When microorganisms reproduce, they release waste products that may change the pH and prevent further reproduction. Therefore, culture media for growing microorganisms are usually…
When might you recommend a client use the Egg Beaters/Egg substitute product (fo
When might you recommend a client use the Egg Beaters/Egg substitute product (for what reason)? Whenwould use of Egg Beaters/Egg substitute product not be recommended? 1. Lo…
When mixed, aqueous solutions of aluminum nitrate, Al(NO 3 ) 3 , and ammonium ca
When mixed, aqueous solutions of aluminum nitrate, Al(NO3)3, and ammonium carbonate, (NH4)2CO3, will form a precipitate of aluminum carbonate, Al2(CO3)3. The balanced equation is:…
When mixed, solutions of copper(II) nitrate, Cu(NO 3 ) 2 , and sodium phosphate,
When mixed, solutions of copper(II) nitrate, Cu(NO3)2, and sodium phosphate, Na3PO4, will form a precipitate of copper phosphate, Cu3(PO4)2. The balanced equation is: 3Cu(NO3)2(aq…
When modelling an object with children it\'s common to include the children via
When modelling an object with children it's common to include the children via composition, as a member of the parent class. Sometimes however the children need to tell the parent…
When molten zinc chloride (ZnCl 2 ) is electrolyzed, zinc is deposited at the ca
When molten zinc chloride (ZnCl2) is electrolyzed, zinc is deposited at the cathode. Calculate the amount of zinc produced if a current of 12.2 A is passed through the electrolyti…
When monitoring the reaction by TLC you see that the most benzaldehyde starting
When monitoring the reaction by TLC you see that the most benzaldehyde starting material has an Rf of 0.25. What should you do? A. Use a greater amount of Ethyl Acetate in relatio…
When monitoring the reaction by TLC you see that the most benzaldehyde starting
When monitoring the reaction by TLC you see that the most benzaldehyde starting material has an Rf of 0.25. What should you do? A. Use a greater amount of Ethyl Acetate in relatio…
When more reactants are added into a reaction system at equilibrium how does the
When more reactants are added into a reaction system at equilibrium how does the system react to compensate for the stress that is applied? A chemical reaction where 3 moles of ga…
When most metallic elements are heated in the presence of oxygen, they undergo a
When most metallic elements are heated in the presence of oxygen, they undergo a combustion reaction producing a metal oxide as the product. In an experiment of this type, a pure …
When most people think of \"chemistry\", they think of complicated equations, ab
When most people think of "chemistry", they think of complicated equations, abstract concepts, reactions that don't matter in real life, etc. While many may think that chemistry d…
When naming molecular compounds from structural formula Do I name the more metal
When naming molecular compounds from structural formula Do I name the more metallic non metal first, so where does hydrogen come, do I assume it goes first since it gives up an el…
When naming molecular compounds from structural formula Do I name the more metal
When naming molecular compounds from structural formula Do I name the more metallic non metal first, so where does hydrogen come, do I assume it goes first since it gives up an el…
When nitric acid and potassium iodide react, they do so in accordance with 8 HNO
When nitric acid and potassium iodide react, they do so in accordance with 8 HNO_3(aq) + 6 KI (aq) rightarrow 2 NO(g) + 3 I_2(s) + 4 H_2O(l) + 6 KNO_3(aq) when 450.0 mL of 0.375 M…
When nitrogen dioxide (NO2) from car exhaust combines with water in the air, it
When nitrogen dioxide (NO2) from car exhaust combines with water in the air, it forms nitric acid (HNO3), which causes acid rain, and nitrogen oxide; 3NO2(g)+H20(l)-->2HNO3(aq)…
When nitrogen dioxide (NO2) from car exhaust combines with water in the air, it
When nitrogen dioxide (NO2) from car exhaust combines with water in the air, it forms nitric acid (HNO3), which causes acid rain, and nitrogen oxide. 3NO2(g)+H2O(l)2HNO3(aq)+NO(g)…
When nitroglycerine (227.1 g/mol) explodes, N2, CO2, H2O, and O2 gases are relea
When nitroglycerine (227.1 g/mol) explodes, N2, CO2, H2O, and O2 gases are released initially. Assume that the gases from the explosion cool to standard conditions without reactin…
When of an alloy at 100.0 oc is dropped into 100.0 g of water at 25.0 oC, the fi
When of an alloy at 100.0 oc is dropped into 100.0 g of water at 25.0 oC, the final temperature is 37.0 °C. What is the specific heat of the alloy? Data for Water 4.184 J g 1 °C-1…
When one mole of (NH_4)_2 HPO_4 (s) dissolves in water the number of moles of io
When one mole of (NH_4)_2 HPO_4 (s) dissolves in water the number of moles of ions present is closest to which value? Which compound is most soluble in water? Which gas is least s…
When one molecule of propane, C 3 H 8 , burns in a gas grill, it combines with f
When one molecule of propane, C3H8, burns in a gas grill, it combines with five oxygen molecules to form three CO2 molecules and four H2O molecules. Select the statement below tha…
When one molecule of propane, C 3 H 8 , burns in a gas grill, it combines with f
When one molecule of propane, C3H8, burns in a gas grill, it combines with five oxygen molecules to form three CO2 molecules and four H2O molecules. Select the statement below tha…
When one of the two 1s electrons in helium is placed in the 2s orbital, two diff
When one of the two 1s electrons in helium is placed in the 2s orbital, two different electronic states are obtained. One is the singlet state, in which the two electrons are indi…
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