id stringlengths 3 7 | question stringlengths 18 1.71k | answer stringlengths 1 879 | answer_type stringclasses 11
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|---|---|---|---|---|---|
1991583 | What is the volume occupied by 12.9 g of argon gas at a pressure of 1.30 atm and a temperature of 318 K? | 6.48 L | Float | Biology-Chemistry | Senior High School |
1535292 | Zinc and magnesium metal each reacts with hydrochloric acid to make chloride salts of the respective metals, and hydrogen gas. A 11.30-g mixture of zinc and magnesium produces 0.5810 g of hydrogen gas upon being mixed with an excess of hydrochloric acid.
Determine the percent magnesium by mass in the original mixture.... | 39.51 % | Percentage | Biology-Chemistry | Senior High School |
1939005 | What is the solubility product expression for Tb{eq}_3{/eq}(PO{eq}_4{/eq}){eq}_4{/eq}? | Ksp = [Tb^4+]^3[PO4^3-]^4 | Expression | Biology-Chemistry | Senior High School |
1149371 | What is the correct name of #Si_3O_5#? | trisilicon pentoxide | String | Biology-Chemistry | Senior High School |
1617767 | A volume of 25.0 mL of 0.100 M {eq}CH_3CO_2H
{/eq} is titrated with 0.100 M NaOH. What is the pH after the addition of 12.5 mL of NaOH? {eq}(K_a \text{ for } CH_3CO_2H = 1.8 \times 10^{-5})
{/eq} | 4.7 | Float | Biology-Chemistry | University |
817715 | Kinetic data for the decomposition of {eq}Cl_2O_2{/eq} to {eq}ClO
{/eq} are summarized in the following table.
{eq}Cl_2O_2(g) \rightarrow 2 ClO(g) {/eq}
Determine the value of the first-order rate constant.
{eq}\begin{array}{c|c|c}
\hline
\text{Time}, \mu s& \left [Cl_2O_2 \right ], \text{M} \\
\hline
0& 6.60... | 8.71e-4 us^-1 | Float | Biology-Chemistry | University |
127279 | What is the molar solubility of magnesium fluoride in a solution that is #"0.1 M"# sodium fluoride? | 6.4 * 10^(-7)"mol/L" | Float | Biology-Chemistry | Senior High School |
278058 | What kind of cells are in the primary bronchi? | Ciliated columnar or cuboidal cells interspersed with goblet cells | List | Biology-Chemistry | Senior High School |
742051 | A gaseous oxide contains {eq}30.4\%
{/eq} of nitrogen, one molecule of which contains one nitrogen atom. Find the density of the oxide relative to oxygen gas. | 1.437 | Float | Biology-Chemistry | Senior High School |
860456 | What isotope decays, by beta emission to give {eq}\displaystyle \rm _{54}Xe^{131}
{/eq}. | I-131 | String | Biology-Chemistry | Senior High School |
2048712 | Which of the following statements is true?
A) Cardiac muscle cells have many nuclei.
B) Smooth muscle cells have T tubules.
C) Striated muscle cells are long and cylindrical with many nuclei.
D) Cardiac muscle cells are found in the heart and large blood vessels. | C | Multiple Choice | Biology-Chemistry | Senior High School |
326010 | The reaction,
{eq}\displaystyle MnO_2(s) + 4 HCl(aq) \longrightarrow MnCl_2(aq) + Cl_2(g) + H_2O(l)
{/eq} was being studied. {eq}12.2 \ g
{/eq} of {eq}MnO_2
{/eq} were reacted with {eq}70.0 \ ml
{/eq} of {eq}2.50 \ M \ HCl
{/eq} solution. The chlorine produced was collected in a vessel. The pressure measured ... | 1.29 L | Float | Biology-Chemistry | Senior High School |
2090641 | A student performed a titration experiment, but analyzing the concentration of a solution of phosphoric acid ({eq}H_3PO_4
{/eq}). The concentration of the {eq}NaOH
{/eq} used in this experiment was standardized at 0.2672 M. Based on the data collected below, what was the concentration of the acid?
$$\begin{matrix}... | 0.1299 M | Float | Biology-Chemistry | Senior High School |
16690 | Assuming ideal gas behavior, what is the pressure (in atm) exerted by 1.57 moles of {eq}Cl_2(g)
{/eq} confined to a volume of 1.50 L at 273 K? | 23.46 atm | Float | Biology-Chemistry | Senior High School |
1384202 | What mass of {eq}\rm H_2
{/eq} gas would be formed when {eq}\rm 2.45\ g\ Zn
{/eq} reacts with excess acetic acid?
{eq}\rm Zn (s) + 2 HC_2H_3O_2 (aq) \to H_2 (g) + Zn (C_2H_3O_2)_2(aq)
{/eq}. | 0.074 g | Float | Biology-Chemistry | Senior High School |
1629015 | Calculate the grams of {eq}SO_2
{/eq} gas present at STP in a 5.9 L container. | 16.64 g | Float | Biology-Chemistry | Senior High School |
68055 | Determine the molar solubility of {eq}MnS
{/eq} in a solution containing 0.0350 M {eq}Na_2S
{/eq}. ({eq}K_{sp}
{/eq} of {eq}MnS = 2.50 \times 10^{-10}
{/eq}) | 7.14e-9 mol/L | Float | Biology-Chemistry | Senior High School |
327586 | If 5.50 L of water vapor at 50.2 degrees C and 0.121 atm reacts with an excess of iron to produce iron(III)oxide and hydrogen gas, how many grams of iron(III) oxide will be produced? | 1.32 g | Float | Biology-Chemistry | Senior High School |
1677485 | What neuron is found in the peripheral nervous system? | Sensory neurons and motor neurons | List | Biology-Chemistry | Senior High School |
764106 | Consider the following reaction: {eq}2A(g) \leftrightharpoons B(g); K_p = 7.36 \times 10^{-5}
{/eq} at 500 K. If a sample of {eq}A(g)
{/eq} at 2.80 atm is heated to 500 K, what is the pressure of {eq}B(g)
{/eq} at equilibrium? | 5.77e-4 atm | Float | Biology-Chemistry | University |
1800109 | What is the density of nitrogen gas at 90.5 kPa and 43.0 °C? | 0.965 g/L | Float | Biology-Chemistry | Senior High School |
505353 | Tired of studying thermo, you come up with the idea of becoming rich by manufacturing diamond from graphite. To do this process at 25 C requires increasing the pressure until graphite and diamond are in equilibrium. The following data are available at 25 C: {eq}\Delta
{/eq}Gm(25 C, 1 atm) = Gm, diamond-Gm, graphite = ... | 15004 bar | Integer | Biology-Chemistry | University |
1698090 | What is the maximum mass of H2O that can be produced by combining 76.9 g of each reactant? 4NH3+5O2-->4NO+6H2O | 51.9 g | Float | Biology-Chemistry | Senior High School |
1066832 | Fill in the gap using the keywords below, not all keywords are used.
ADP, G3P, ATP, NADH, Pyruvate, GTP, Glucose, Mesmerized, Metabolized, Oxidized, Reduced
Glycolysis occurs when glucose molecules use two {eq}\text{_____}
{/eq} to convert it into two {eq}\text{_____}
{/eq} molecules that are {eq}\text{_____}
{/eq... | ATP
G3P
Oxidized
NADH | List | Biology-Chemistry | Senior High School |
250388 | Which letter represents the activated complex?
1. A
2. B
3. F
4. G | B | Multiple Choice | Biology-Chemistry | Senior High School |
173607 | Write an equation for the redox reaction that occurs between nitrous acid and potassium iodide. | 2KI + 4HNO2 -> I2 + 2NO + 2KNO2 + 2H2O | Expression | Biology-Chemistry | Senior High School |
1724222 | How would you identify the acid, base, conjugate acid and conjugate base in the following reaction:
HCN + SO4^(2-) --> HSO4^(-) + CN^(-)? | Acid: HCN, Conjugate base: CN-, Base: SO4^(2-), Conjugate acid: HSO4^(-) | List | Biology-Chemistry | Senior High School |
1051504 | What is the equilibrium {eq}\rm{Ba}^{2+}
{/eq} concentration when {eq}2.40\ \rm{L}
{/eq} of a {eq}0.156\ \rm{M}
{/eq} barium nitrate solution are mixed with {eq}2.19\ \rm{L}
{/eq} of a {eq}0.323\ \rm{M}
{/eq} potassium sulfate solution? | 0.081 M | Float | Biology-Chemistry | Senior High School |
821090 | If you are given a bottle that contains 45.0 mL of 0.345 M potassium sulfate solution, what mass in grams of potassium sulfate is present in this bottle? | 2.71 g | Float | Biology-Chemistry | Senior High School |
1858959 | When the equation for the following reaction in basic solution is balanced, what is the sum of the coefficients?
{eq}MnO_2 + HO_2^{1-} \rightarrow MnO_4^{1-}
{/eq}
A. 11
B. 31
C. 14
D. 9 | A | Multiple Choice | Biology-Chemistry | Senior High School |
509321 | Determine the amount of heat in kj, released when 45.0g ethanol vapor at its boiling point of 78.3 C is condensed and cooled to -45.5 C . The enthalpy of vaporation is 841 J g the specific heat of liquid ethanol is 2.44 J g C. | 51.4 kJ | Float | Biology-Chemistry | Senior High School |
1527606 | What step(s) of cellular respiration can occur without oxygen? | glycolysis | List | Biology-Chemistry | Senior High School |
1091618 | For the reaction {eq}3O_2(g) \longrightarrow 2O_3(g){/eq} the value of {eq}K_c{/eq} is {eq}1.7* 10^{-56}{/eq} at {eq}25 ^o C{/eq}.
If the equilibrium concentration of {eq}O_2{/eq} in air at {eq}25 ^o C{/eq} is {eq}8 \times 10^{-3} M{/eq}, what is the equilibrium concentration of {eq}O_3{/eq}? | 9.33e-32 M | Float | Biology-Chemistry | Senior High School |
147498 | How do insulin and glucagon function in the body?
a) Both act as sensors to provide information to the pancreas about blood glucose levels.
b) Both act as stimulators to induce changes in cells to either take up glucose from the blood or move glucose into the blood.
c) Both act as regulators to synthesize or breakdo... | b | Multiple Choice | Biology-Chemistry | Senior High School |
1542023 | At a certain temperature the vapor pressure of pure acetyl bromide (CH_3COBr) is measured to be 4B6. torr Suppose a solution is prepared by mixing 76.9 g of acetyl bromide and 119. g of hepriane (C_7H_16).
Calculate the partial pressure of acetyl bromide vapor above this solution.
Round your answer to 3 significant d... | 167 torr | Integer | Biology-Chemistry | University |
2053757 | How many moles are in 30.0 grams of {eq}N_2
{/eq}? | 0.938 moles | Float | Biology-Chemistry | Senior High School |
1979996 | The current scientific definition of standard temp and pressure (STP) is: 0 degrees C and 1.00 bar pressure of a gas, using ideal gas law calculate the volume in L occupied by 1 mol of an ideal gas under these condition( to three significant figures). | 22.7 L | Float | Biology-Chemistry | Senior High School |
1686774 | Calculate the pH of the solution that results from each of the following mixtures:
150.0 mL of 0.24 M HF with 225.0 mL of 0.31 M NaF
Express your answer using two decimal places. | 3.49 | Float | Biology-Chemistry | University |
1699010 | What is the concentration of carbon dioxide in g/m{eq}^3
{/eq} if the concentration is 392 ppm in air at 100 KPa and 18 degrees Celsius? | 392 g/m^3 | Float | Biology-Chemistry | University |
1849800 | A chemistry student weighs out 0.0222 g of sulfurous acid into a 250 mL volumetric flask and dilutes it to the mark with distilled water. He plans to titrate the acid with 0.0600 M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the final equivalence point. | 9.02 mL NaOH | Float | Biology-Chemistry | Senior High School |
824832 | In the laboratory, a coffee cup calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid or to measure the energy of a solution phase reaction. A student heats 67.47 grams of magnesium to {eq}7.81 ^{\circ} C{/eq}9 and then drops it into a cup containing 77.67 grams of... | 1.44 J/g°C | Float | Biology-Chemistry | Senior High School |
1138623 | A buffer solution that is 0.371 M in {eq}HCN
{/eq} and 0.371 M in {eq}NaCN
{/eq} has a pH of 9.40. Addition of which of the following would increase the capacity of the buffer for added {eq}H_3O^+
{/eq}? (Select all that apply.)
a. both {eq}HCN
{/eq} and {eq}NaCN
{/eq}
b. {eq}NaCN
{/eq}
c. {eq}HCN
{/eq}
d. p... | b | Multiple Choice | Biology-Chemistry | University |
46147 | What is the density of water in grams per millimetre as it is put down in chemistry? | 1.0e-3 g/mm^3 | Float | Biology-Chemistry | Senior High School |
307607 | What is the double replacement reaction for {eq}\rm NaBr + Hg(NO_3)
{/eq}? | 2NaBr(aq) + Hg(NO_3)_2(aq) -> 2NaNO_3(aq) + HgBr_2(s) | Expression | Biology-Chemistry | Senior High School |
1024593 | A solution of HClO is mixed and found to have a pH of 4.53. Find what the initial concentration of HClO was for this solution. Ka = {eq}3.00 \times 10^{-8}
{/eq} for HClO. | 0.0291 M | Float | Biology-Chemistry | Senior High School |
213673 | Determine the pH of a 0.240 M solution of benzoic acid. | 2.41 | Float | Biology-Chemistry | Senior High School |
1321387 | Consider the following reaction:
{eq}2 NO(g) + Br_2(g) \leftrightharpoons 2 NOBr(g)
{/eq}
At a specific temperature, the equilibrium concentrations were determined to be {eq}[NO] = 0.082 \mathit{M}, [Br_2] = 0.069 \mathit{M},
{/eq} and {eq}[NOBr] = 0.190 \mathit{M}
{/eq}.
What is the value of the equilibrium cons... | 78 | Integer | Biology-Chemistry | Senior High School |
780884 | What mass contains {eq}5.84
{/eq} moles of titanium (Ti)? | 280 g Ti | Integer | Biology-Chemistry | Senior High School |
1652955 | What is the equation for freezing point? | ΔTf = Kf . m | Expression | Biology-Chemistry | Senior High School |
1706912 | Write the molecular orbital electronic configuration for {eq}\begin{bmatrix} F_2 \end{bmatrix}^{2+}
{/eq}. | {eq}\sigma {\left( {1s} \right)^2}{\sigma ^*}{\left( {1s} \right)^2}\sigma {\left( {2s} \right)^2}{\sigma ^*}{\left( {2s} \right)^2}\sigma {\left( {2{p_z}} \right)^2}\pi {\left( {2{p_x}} \right)^2}\pi {\left( {2{p_y}} \right)^2}{\pi ^*}{\left( {2{p_x}} \right)^1}{\pi ^*}{\left( {2{p_y}} \right)^1}{/eq} | Expression | Biology-Chemistry | University |
1683534 | You prepare a buffer by combining {eq}50 \ mL
{/eq} of a {eq}0.1 \ M
{/eq} stock solution of disodium phosphate with {eq}50 \ mL
{/eq} of a {eq}0.1 \ M
{/eq} stock solution of trisodium phosphate. How many millilitres of {eq}1 \ M \ NaOH
{/eq} can you add to your {eq}100 \ mL
{/eq} of buffer before it is {... | 4.09 mL | Float | Biology-Chemistry | University |
1617619 | Most of the lymphocytes are found in the _____, where they play a number of important roles in immunity. | lymphatic tissues | String | Biology-Chemistry | Senior High School |
1736271 | What is the maximum possible concentration of {eq}\rm
Ni^{2+}
{/eq} ion in water at {eq}\rm
25 ^\circ C
{/eq} that is saturated with 0.10 M {eq}\rm
H_2S
{/eq} and maintained at pH 3.0 with HCl? | 3.0 M | Float | Biology-Chemistry | University |
689046 | Calculate the mass, in grams, of 0.52 moles of potassium. | 20. g | Float | Biology-Chemistry | Senior High School |
554818 | Calculate the pOH of an aqueous solution with [H{eq}^+
{/eq}] = 1.5 x 10{eq}^{-13}
{/eq} M at 25 degrees Celsius. | 1.2 | Float | Biology-Chemistry | Senior High School |
1725132 | At 1405 K, {eq}K_c
{/eq} for the reaction, {eq}2 H_2S (g) \rightleftharpoons 2 H_2 (g) + S_2 (g)
{/eq}, is 0.00023.
Calculate value of {eq}K_c
{/eq} for following equation: {eq}H_2 (g) + \frac{1}{2} S_2 (g) \rightleftharpoons H_2S (g)
{/eq} | 65.94 | Float | Biology-Chemistry | Senior High School |
1845921 | How do you find the frequency of a recessive allele? | square root of the proportion of individuals displaying the recessive trait | Expression | Biology-Chemistry | Senior High School |
1578229 | What volume will a 32 g sample of butane gas {eq}C_4H_{10}
{/eq} g occupy at a temperature of 45 degrees Celsius and a pressure of 728 mm Hg? | 15.0 L | Float | Biology-Chemistry | Senior High School |
70775 | A 1.95-mg sample of dioctyl phthalate {eq}(C_{24}H_{38}O_4)
{/eq}, a plasticizer, is dissolved in {eq}H_2O
{/eq} to give 640 mL of solution. What is the concentration of dioctyl phthalate in parts per billion (ppb)? | 3.05e+3 ppb | Float | Biology-Chemistry | Senior High School |
2017677 | In some aquatic ecosystems, nitrate ({eq}NO_3^-
{/eq}) is converted to nitrite ({eq}NO_2^-
{/eq}), which then decomposes to nitrogen and water. As an example of this second reaction, consider the decomposition of ammonium nitrite:
{eq}NH_4NO_2(aq) \rightarrow N_2(g) + 2H_2O(l)
{/eq}
What would be the change in pre... | 9.88 atm | Float | Biology-Chemistry | Senior High School |
1969204 | What is the electron dot diagram for zinc? | Zn: | String | Biology-Chemistry | Senior High School |
885717 | Rank the following in order of decreasing acid strength.
a. HCl
b. HClO
c. HNO{eq}_2
{/eq}
d. HCN | HCl > HNO2 > HOCl > HCN | List | Biology-Chemistry | Senior High School |
1102006 | A crude oil burned in electrical generating plants contains about {eq}1.2\%
{/eq} sulfur by mass. When the oil burns, the sulfur forms sulfur dioxide gas: {eq}\rm S (s) + O_2 (g) \to SO_2 (g)
{/eq}. How many liters of {eq}\rm SO_2\ (d=2.60\ g/L)
{/eq} are produced when {eq}\rm 1.00 \times 10^{4}\ kg
{/eq} of oil bu... | 92164 L | Integer | Biology-Chemistry | Senior High School |
2108378 | Here's a hypothesis for the duckweed experiment: “if duckweed is grown at pH 5, then it will grow at the same rate as when grown at pH 7, or normal pH, because it can tolerate mildly acidic environments.” Which elements should be controlled variables for this experiment? Check all that apply. environmental pH timing of... | B, C, D, E, F | Multiple Choice | Biology-Chemistry | Senior High School |
1056385 | Write a net ionic equation to show that acetylsalicylic acid (aspirin), hc9h7o4, behaves as a brønsted-lowry acid in water. | HC₉H₇O₄(aq) + H₂O(l) → C₉H₇O₄⁻(aq) + H₃O⁺(aq) | Expression | Biology-Chemistry | Senior High School |
1518020 | Calculate the percent ionization of nitrous acid in a solution that is 0.253 M in nitrous acid ({eq}HNO_2
{/eq}) and 0.111 M in potassium nitrite ({eq}KNO_2
{/eq}). The acid dissociation constant of nitrous acid is {eq}4.50 \times 10^{-4}
{/eq}. | 4.03% | Percentage | Biology-Chemistry | University |
989885 | The change in energy for the following reaction is referred to as the _____ for fluorine.
{eq}F(g) + e^- \to F^-(g)
{/eq} | Electron gain enthalpy | String | Biology-Chemistry | Senior High School |
607387 | Which of the following statements is always TRUE? Justify your answer.
a. Exothermic reactions have lower activation energies than endothermic reactions.
b. The rate for a reaction depends on the concentrations of all the reactants.
c. The rate of a catalyzed reaction is independent of the concentration of the catal... | d | Multiple Choice | Biology-Chemistry | Senior High School |
1918489 | Calculate the grams of oxygen which would be involved in heating 5 g of potassium trioxochlorate (V). | 1.96 g | Float | Biology-Chemistry | Senior High School |
905433 | Calculates the work done (in joules) when {eq}42.8 \, \mathrm{g}
{/eq} of tin dissolves in excess acid at {eq}1.10 \, \mathrm{atm}
{/eq} and {eq}23 \, ^{\circ}C
{/eq}. Assume ideal gas behavior. | -887.17 Joules | Float | Biology-Chemistry | Senior High School |
658922 | A whole onion root tip has a total of 100 cells. Of these 100 cells, 58 are in interphase, 17 are in prophase, 11 are in metaphase, 5 are in anaphase, and 9 are in telophase. If a cell undergoes mitosis in 10 hours, how long does the average growing onion cell spend in anaphase? | 1.2 hours | Float | Biology-Chemistry | Senior High School |
246371 | If 4.25 moles of water were produced, how many grams of {eq}C_2H_2
{/eq} reacted?
{eq}C_2H_2 + O_2 \to CO_2 + H_2O
{/eq} (unbalanced) | 111 g | Float | Biology-Chemistry | Senior High School |
1984352 | What causes mRNA translation to stop? | UAA, UAG, UGA | List | Biology-Chemistry | Senior High School |
572544 | In which of the following pairs of ionic compounds are both members of the pair soluble in water?
a. {eq}AgNO_3
{/eq} and {eq}AgCl
{/eq}
b. {eq}LiOH
{/eq} and {eq}Li_2SO_4
{/eq}
c. {eq}PbSO_4
{/eq} and {eq}BaCO_3
{/eq}
d. {eq}NH_4I
{/eq} and {eq}Sn_3(PO_4)_2
{/eq} | b | Multiple Choice | Biology-Chemistry | Senior High School |
290643 | What is the pH of a solution of 1.0 x {eq}10^{-10}
{/eq} NaOH?
a) 4
b) 7
c) 8
d) -4
e) 14 | a | Multiple Choice | Biology-Chemistry | Senior High School |
1105428 | Suppose the Ka values for the hypothetical acids HX, HY, and HZ are 9.5 x 10{eq}^{5}
{/eq}, 7.6 x 10{eq}^{4}
{/eq}, and 1.2 x 10{eq}^{-2}
{/eq}, respectively. Assuming that 'A' is a cation that produces a slightly soluble salt with all three acids, which of the following salts would have its solubility most affected... | (a) | Multiple Choice | Biology-Chemistry | Senior High School |
878884 | Describe how you would separate the metal ions in a solution containing silver ion, copper(II) ion, and nickel(II) ion, using the sulfide scheme of qualitative analysis. | 1. Add hydrochloric acid (HCl) to precipitate silver ions as silver chloride (AgCl). Decant the solution to remove the AgCl precipitate.
2. To the remaining solution, add 0.3M HCl and then hydrogen sulfide (H2S). This precipitates copper(II) ions as copper(II) sulfide (CuS) while nickel(II) ions remain in solution.
3. ... | List | Biology-Chemistry | University |
1700457 | 1.92 g sample of hydrogen peroxide solution generates 37.8 mL O{eq}_2
{/eq} at 759 torr and 35{eq}^{o}
{/eq} C. What is the percent strength of the peroxide solution? How would you solve this problem and which equations would you use? | 5.31% | Percentage | Biology-Chemistry | Senior High School |
628548 | What chemical in the catabolism of glucose enters the mitochondria? | Pyruvate | String | Biology-Chemistry | Senior High School |
1312480 | A solution of magnesium nitrate is 0.311 M. Calculate the concentration of the solution in milligrams magnesium nitrate per 10.0 mL of solution. Molar Mass of the compound is 148.31 grams per mol. | 461 mg/10 mL | Integer | Biology-Chemistry | Senior High School |
454635 | Assuming the density of the wine to be 1.0 g/ml, what is the caloric content due to the alcohol (ethanol) in a 6-oz glass of wine (177 ml)? | 119.3 kcal | Float | Biology-Chemistry | Senior High School |
561548 | A solution was prepared by dissolving 100 mg of protein X in 100 ml of water.
Molecular weight of protein X is 15,000 Da; Avogadro’s number = 6.022x 1023.
Calculate the molarity(M) of the resulting solution? | 67µM | Integer | Biology-Chemistry | Senior High School |
1701727 | The rate constant for this first-order reaction is 0.550 s{eq}^{-1}
{/eq} at 400 {eq}^{\circ}
{/eq}C.
A {eq}\rightarrow
{/eq} products
How long (in seconds) would it take for the concentration of A to decrease from 0.720 M to 0.240 M? | 2s | Integer | Biology-Chemistry | Senior High School |
869289 | Jack and Jill are thinking about starting a family and they come to you with a question about a rare recessive genetic disease called Alpers Syndrome. Alpers causes progressive neurodegeneration in infants and children and is usually lethal within the first 10 years of life. Jack's grandfather had a brother die of Alpe... | 0.0000156 | Float | Biology-Chemistry | University |
625524 | If a segment of DNA is 5'-CATT AC-3', the complementary DNA strand is
(a) 3'-CATTAC-5'
(b) 3'-GTAATG-5'
(c) 5'-CATTAC-3'
(d) 5'-GTAATG-3'
(e) 5'-CATTAC-5' | b | Multiple Choice | Biology-Chemistry | Senior High School |
1938702 | How would you determine the percent yield for the reaction between 15.8g of NH3 and excess oxygen to produce 21.8g of NO gas and water? | 78% | Percentage | Biology-Chemistry | Senior High School |
840994 | Write a balanced equation to synthesize iron (III) acetylacetonate. | Fe(OH)3 + 3 C5H8O2 → Fe(C5H7O2)3 + 3 H2O | Expression | Biology-Chemistry | Senior High School |
253380 | For the complete redox reaction given below, break down each reaction into its half-reactions (oxidation and reduction).
{eq}2Cs + Br_2 \to 2CsBr
{/eq} | {
\rm oxidation: 2Cs \to 2Cs^+ + 2e^- \\
reduction: Br_2 + 2e^- \to 2Br^-
} | List | Biology-Chemistry | Senior High School |
2080285 | If you were to trace retinitis pigmentosa (RP) through your family tree based on relatives who had been diagnosed and those who hadn't, what tool might you use? | A Pedigree | String | Biology-Chemistry | Senior High School |
1927928 | The octane rating of gasoline is a relationship of the burning efficiency of the given gasoline mixture to the burning efficiency of octane (C8H18). Like most hydrocarbons, octane reacts with oxygen gas to produce carbon dioxide and water. The unbalanced equation for this reaction is | C₈H₁₈(l) + 12.5 O₂(g) ⇒ 8 CO₂(g) + 9 H₂O(l) | Expression | Biology-Chemistry | Senior High School |
889718 | What is the electron configuration of the #"As"^(3-)"# ion? | [Ar]3d^104s^24p^6 | String | Biology-Chemistry | Senior High School |
451027 | A saturated solution of #PbBr_2# is prepared by dissolving the solid salt in water. The concentration of #Pb_2^+# in solution is found to be 0.0115 M. What is the Ksp for #PbBr_2#? | 6.1e-6 | Float | Biology-Chemistry | Senior High School |
1918469 | If you wanted to replicate DNA artificially in large quantities, how would you go about it? | PCR | String | Biology-Chemistry | Senior High School |
706112 | What is the heat in kilojoules needed to vaporize 9.00 kg of water at 100°C? | 20316kJ | Integer | Biology-Chemistry | Senior High School |
1792565 | How would you write the equation for this reaction: excess potassium hydroxide solution is added to a solution of potassium dihydrogen phosphate? | KOH(aq) + KH_2PO_4(aq) rightleftharpoons K_2HPO_4(aq) + H_2O(l) | Expression | Biology-Chemistry | Senior High School |
698336 | Chlorine has two isotopes with mass numbers 35 and 37. Calculate the relative abundance of the two isotopes accounting for the normal atomic mass of 35.5. | 73%, 27% | Percentage | Biology-Chemistry | Senior High School |
1328365 | Write the product for {eq}\displaystyle \rm ammonium \ sulfate (aq)
{/eq} and {eq}\displaystyle \rm calcium \ hydroxide (aq)
{/eq}. | 2NH₄OH(aq) + CaSO₄(s) | Expression | Biology-Chemistry | Senior High School |
720994 | What mass of iron (III) chlorate is needed to precipitate all the chromate ions from 234 mL of a 0.100 M lithium chromate solution? | 4.78 g | Float | Biology-Chemistry | Senior High School |
1754959 | The metal lead crystallizes in a face centered cubic unit cell. When X-rays with λ = 0.8302 A{eq}^o
{/eq} are used, the second-order Bragg reflection from a set of parallel planes in a(n) lead crystal is observed at an angle θ = 9.653 . If the spacing between these planes corresponds to the unit cell length (d = a), c... | 4.951 A | Float | Biology-Chemistry | University |
138724 | Please hurry 40 points
What is the primary distinguishing factor between anaerobic and aerobic respiration?
Anaerobic respiration uses fermentation whereas aerobic respiration uses glycolysis, the Krebs cycle, and the electron transport chain.
Aerobic respiration gives off carbon dioxide whereas anaerobic respira... | C | Multiple Choice | Biology-Chemistry | Senior High School |
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