id stringlengths 4 7 | question stringlengths 25 892 | answer stringlengths 1 742 | answer_type stringclasses 10
values | category stringclasses 1
value | difficulty stringclasses 2
values |
|---|---|---|---|---|---|
1772555 | The reaction, {eq}2NO + Cl_22NOCl {/eq}, has an activation energy of {eq}18.7 \ kJ mol^ {-1} {/eq}. At {eq}27 ^{\circ}C,k= 20.7 L^2mol^{-2}s^{-1}. {/eq}
Find the temperature (in K) at which the rate constant will be {eq}11.4 \ L^2mol^{-2}s^{-1} {/eq}? Round your answer to 3 significant figures and in Kelvin. | 278K | Integer | Biology-Chemistry | University |
1512934 | Write the symbol for the ion with a 3+ charge, 28 electrons, and a mass number of 69. | ^{69}_{31}Ga^{3+} | String | Biology-Chemistry | Senior High School |
1559405 | Which of these compounds contain elements that do not follow the octet rule? explain. **? | Hydrogen and helium do not follow the octet rule, as they follow the duet rule. Boron in BF3 is another example. | List | Biology-Chemistry | Senior High School |
435833 | Is animal photosynthesis possible? | yes | Boolean | Biology-Chemistry | Senior High School |
380567 | Predict the ideal values for the bond angles about the highlighted carbon atom: CH{eq}_3
{/eq}C{eq}\underline{C}
{/eq}CH{eq}_2
{/eq}COOH. | 180 degrees | Integer | Biology-Chemistry | Senior High School |
1682945 | At a certain temperature, the pH of a neutral solution is 7.77. What is the value of K{eq}_w
{/eq} at that temperature? | 2.88e-16 | Float | Biology-Chemistry | Senior High School |
973650 | What mass of water is produced from the complete combustion of 1.8 moles of methane? | 35.2 g | Float | Biology-Chemistry | Senior High School |
1814511 | A certain stem cell produces red blood cells, platelets, and some other kinds of vascular tissue. what kind of stem cell is it? | Multipotent stem cells | String | Biology-Chemistry | Senior High School |
1235361 | What is the cobalt (II) ion concentration in a solution prepared by mixing 449 mL of 0.380 M cobalt (II) nitrate with 441 mL of 0.219 M sodium hydroxide? The {eq}K_{sp}
{/eq} of cobalt (II) hydroxide is {eq}1.3 \times 10^{-15}
{/eq} | 0.138M | Float | Biology-Chemistry | University |
1160500 | How many molecules are in 5.3 moles of glucose? | 3.2e+24 glucose molecules | Float | Biology-Chemistry | Senior High School |
1441079 | At what initial concentration would a solution of acetic acid {eq}(Ka = 1.8 \times 10^{-5})
{/eq} be 2% ionized? | 0.045 M | Float | Biology-Chemistry | Senior High School |
127285 | If 80g {eq}KNO_3
{/eq} is mixed with 100g water at 30 degrees C how much will not dissolve? | 34.2 g | Float | Biology-Chemistry | Senior High School |
965164 | What type of solvent could be used to dissolve an oil stain? | A nonpolar solvent such as hexane or carbon tetrachloride | List | Biology-Chemistry | Senior High School |
829588 | The most probable mechanism of reactivity for the solvolysis of 2-chloro-norbornane is | A | Multiple Choice | Biology-Chemistry | University |
1926258 | What is the boiling point for a 3 molal #"CaCl"_2# aqueous solution? #K_b = 0.512^@ "C/m"#. | 102.396 $^oC$ | Float | Biology-Chemistry | Senior High School |
465272 | Indicate the hybridization of the central atom for the species:
{eq}\displaystyle \rm BrF_3
{/eq} | sp^3d | String | Biology-Chemistry | Senior High School |
660934 | Calculate the mass, in grams, of 4.0 moles of {eq}O_2
{/eq}. | 128 g | Integer | Biology-Chemistry | Senior High School |
958898 | What is the ratio of the concentration of sodium acetate to the concentration of acetic acid at ph 5.75? | 9.77 | Float | Biology-Chemistry | University |
816577 | If #"1500 g"# of water was heated by the combustion of #"1 g"# of sucrose to go from #25.0^@ "C"# to #28.3^@ "C"#, what is the enthalpy of combustion in #"kJ/mol"#? | -7080 kJ/mol | Integer | Biology-Chemistry | Senior High School |
1174512 | Give the condensed electron configuration for {eq}U
{/eq}, using the appropriate noble-gas core abbreviation. | [Rn]5f^3 6d^1 7s^2 | String | Biology-Chemistry | University |
1615970 | Given the reaction :
{eq}AB \rightarrow A + B
{/eq}
If the initial concentration of AB is 0.250 M, and the reaction mixture initially contains no products, what are the concentrations of A and B after 75s, {eq}k = 5.6 \times 10^{-2}
{/eq} | 0.09M | Float | Biology-Chemistry | Senior High School |
1105617 | In a liquid mixture 3 moles of component A is mixed with 2 moles of component B. The activity coefficient of component A is 0.75. For a temp at 365 K, determine the chemical potential of A in the mixture. The chemical potential of component A in its pure state is 48.5 KJ/mol. | 46.076 kJ | Float | Biology-Chemistry | University |
1532439 | An organism is described as {eq}\displaystyle 2 n = 26
{/eq}. How many chromatids per chromosome are in one meiotic cell during Telophase 1? | 2 | Integer | Biology-Chemistry | Senior High School |
1620062 | Excess {eq}NH_3(aq)
{/eq} is added to {eq}H_3PO_4(aq)
{/eq}. Does a reaction occur? If so, write the balanced net ionic equation. If a reaction is not expected to occur, explain why not. | Yes, a reaction occurs. The balanced net ionic equation is: 3NH3 (aq) + H3PO4 (aq) <=> 3NH4+ (aq) + PO4^3- (aq) | Expression | Biology-Chemistry | Senior High School |
391226 | What ions are formed when {eq}H_2SO_4
{/eq} dissolves in water? | HSO4-, SO42-, and H3O+ | List | Biology-Chemistry | Senior High School |
474857 | What is the volume occupied by {eq}12.3\ g
{/eq} or Argon gas at a pressure of {eq}\rm 1.17\ atm
{/eq} and a temperature of {eq}\rm 455\ K
{/eq}? | 9.82 L | Float | Biology-Chemistry | Senior High School |
1937035 | In order to produce {eq}\rm
Hg_2Br_2
{/eq}, the following procedure is carried out. A 30.0 mL sample of aqueous {eq}\rm
0.300\ M\ Hg_2(NO_3)_2
{/eq} is mixed with 25.0 mL of an aqueous 0.500 M NaBr solution. What is the maximum mass of {eq}\rm
Hg_2Br_2
{/eq} that could be produced from this reaction?
Balanced re... | 3.51 g | Float | Biology-Chemistry | Senior High School |
1619147 | How many milliliters of carbon dioxide gas at STP are produced from the decomposition of 5.25g of ferric carbonate?
Fe2(CO3)3(s) --> Fe2O3(s)+3CO2(g) | 1210 mL | Integer | Biology-Chemistry | Senior High School |
1588414 | Calculate the mass of {eq}NH_4Cl
{/eq} that must be added to 56 mL of a 0.932 M solution of {eq}NH_3
{/eq} to obtain a buffer with a pH of 9.1. | 3.985g | Float | Biology-Chemistry | University |
1594806 | Comment on the relative ease of breaking the R-X bond in acid, aryl, and alkyl halides. | acid > alkyl halides > aryl halides | List | Biology-Chemistry | University |
406042 | If you have 3.0 moles of an ideal gas at a pressure of 4.6 atm and a volume of 6.0 L, what is the temperature? | 112 K | Integer | Biology-Chemistry | Senior High School |
740381 | Determine the entropy of formation,{eq}\Delta_{\text{f}}S
{/eq}, of the compound, {eq}\text{Fe}_{2}\text{(SO}_{4})_{3}
{/eq}. Assume {eq}25^\circ \text{C}
{/eq}. | -1,143.0 J/mol ⋅ K | Float | Biology-Chemistry | University |
1001403 | What is the reaction between sulfur dioxide, #"SO"_2#, and potassium dichromate, #"K"_2 "Cr"_2"O"_7# ? | 3SO2 + K2Cr2O7 + H2SO4 -> K2SO4 + Cr2(SO4)3 + H2O | Expression | Biology-Chemistry | Senior High School |
488649 | The 3rd order neurons in the auditory pathway are located in the _____ at the junction of the pons and medulla. | superior olivary nuclei | String | Biology-Chemistry | University |
1898203 | A 4.50-mol sample of HI is placed in a 1.00-L vessel at 460 C, and the reaction system is allowed to come to equilibrium. The HI partially decomposes, forming 0.343 mol H2 and 0.343 mol I2 at equilibrium. What is the equilibrium constant Kc for the following reaction at 460 C? 1/2 H2(g) + 1/2 I2(g) -->HI(g) | 11.12 | Float | Biology-Chemistry | Senior High School |
815650 | What is the mass of 5.00 moles of {eq}Pb(CH_3COO)_2?
{/eq} | 1625 g | Integer | Biology-Chemistry | Senior High School |
1492350 | A student performed the iodata analysis and found that it took {eq}\displaystyle \rm 7.80 \ mL
{/eq} of {eq}\displaystyle \rm 0.02 \ M \ Na_2S_2O_3
{/eq} to titrate {eq}\displaystyle \rm 4.00 \ mL
{/eq} of saturated copper iodate.
Find {eq}\displaystyle \rm K_{\psi}
{/eq} value of copper iodate? | 2.37e-4 | Float | Biology-Chemistry | University |
1612389 | Water in the Bow River contains a relatively high amount of dissolved limestone. {eq}CaCO_{3}(aq)
{/eq}, a weak base. This is an indication that the bedrock of the Bow River:
a) donates a small amount of protons to the water
b) has a low buffering capacity
c) donates a large amount of protons to the water
d) has a... | d | Multiple Choice | Biology-Chemistry | Senior High School |
442557 | A {eq}0.3146 g{/eq} sample of a mixture of {eq}NaCl(s){/eq} and {eq}KBr(s){/eq} was dissolved in water. The resulting solution required {eq}50.30 ml{/eq} of {eq}0.08765 M AgNO3(aq){/eq} to precipitate the {eq}Cl(aq){/eq} and {eq}Br(aq){/eq} as {eq}AgCl(s){/eq} and {eq}AgBr(s){/eq}. Calculate the mass percentage of {eq}... | 64.625% | Percentage | Biology-Chemistry | Senior High School |
1855807 | A metal crystallizes with a body-centered cubic unit cell. The radius of the metal atom is 105 pm. Calculate the edge length of the unit cell. Give your answer numerically and in terms of pm. | 242 pm | Integer | Biology-Chemistry | Senior High School |
1073431 | How is the electron configuration of chromium different? | [Ar]3d^5 4s^1 | String | Biology-Chemistry | Senior High School |
1107398 | What is the electron pair geometry for an ammonia molecule, #NH_3#? | AX_3E | String | Biology-Chemistry | Senior High School |
1856937 | What is an example of orbital hybridization? | Methane (CH4) | String | Biology-Chemistry | Senior High School |
2002409 | How many grams of {eq}CaH_2
{/eq} are needed to generate 146 L of {eq}H_2
{/eq} gas if the pressure of {eq}H_2
{/eq} is 826 torr at 22{eq}^\circ
{/eq}C? | 138 g CaH2 | Float | Biology-Chemistry | Senior High School |
1764500 | A {eq}\rm 132\ g
{/eq} sample of nonvolatile compound was dissolved in {eq}4.30
{/eq} mol of cyclohexane {eq}\rm (P ^\circ = 100\ mm\ Hg)
{/eq}. The vapor pressure of the solution was determined to be {eq}\rm 85.00\ mm\ Hg
{/eq}. What is the molar mass of the component? | 173.95 g/mol | Float | Biology-Chemistry | Senior High School |
456267 | Write the reaction when {eq}NaOH
{/eq} is added to an acetic acid/acetate buffer system. | CH_3COOH(aq) + OH^-(aq) ⇌ CH_3COO^-(aq) + H_2O(l) | Expression | Biology-Chemistry | Senior High School |
714000 | Do heavy metal compounds contain metallic salts? | Yes | Boolean | Biology-Chemistry | Senior High School |
1525010 | What pressure (in kPa) will 2 g of argon exert when placed in a 500 mL cylinder at 18 degrees Celsius? | 242 kPa | Float | Biology-Chemistry | Senior High School |
1557195 | In the reaction shown here, 4.05 L of {eq}O_2
{/eq} were formed at P = 753 mmHg and T = 308 K. $$2Ag_2O_{(s)} \to 4Ag_{(s)} + O_{2(g)}
$$ How many grams of {eq}Ag_2O
{/eq} decomposed? Express the mass to three significant figures and include the appropriate units. | 73.7 grams | Float | Biology-Chemistry | Senior High School |
1850599 | Write balanced net ionic equation for the third stage of dissociation of the triprotic acid, {eq}\rm{H}_3PO_4
{/eq}. | HPO4^2-(aq)⇌H+(aq)+PO4^3-(aq) | Expression | Biology-Chemistry | Senior High School |
341477 | What metals are a collection of seventeen chemical elements in the periodic table, specifically the fifteen lanthanoids, plus scandium and yttrium? | The lanthanides | String | Biology-Chemistry | Senior High School |
379224 | A 400 mL sample of krypton is held at STP. What volume does the gas occupy when the pressure is tripled and the temperature is doubled? | 268 mL | Integer | Biology-Chemistry | Senior High School |
90608 | What volume of #O_2#, measured 82.1°C and 713 mm Hg, will be produced by the decomposition of 5.71 g of #KClO_3#? | 2.18 L | Float | Biology-Chemistry | Senior High School |
439669 | If 224 grams of {eq}CO
{/eq} reacts with 400 grams of {eq}Fe_2O_3
{/eq}, how many grams of {eq}CO_2
{/eq} can be produced?
{eq}Fe_2O_3 + 3CO \to 2Fe + 3CO_2
{/eq} | 331 g | Integer | Biology-Chemistry | Senior High School |
1940503 | What is the maximum number of electrons (in an atom) that can have both quantum numbers: n = 4 and m_l = 1? Explain your answer. | 6 | Integer | Biology-Chemistry | Senior High School |
1919806 | What volumes of the solutions would be required to form 1.00 mol of Na{eq}_2
{/eq}HPO{eq}_4
{/eq}? | V = 1.00 mol / M | Expression | Biology-Chemistry | Senior High School |
324419 | A combustion analysis of a 0.503 g sample of an unknown hydrocarbon yields 1.53 g CO{eq}_2
{/eq} and 0.756 g H{eq}_2
{/eq}O. What is the empirical formula of the sample? | C5H12 | String | Biology-Chemistry | Senior High School |
155903 | Calcium carbonate, {eq}CaCO_3
{/eq}, decomposes upon heating to calcium oxide and carbon dioxide. What mass of solid calcium carbonate is required to produce 2.40 liters of carbon dioxide measured at Standard Temperature and Pressure (STP)?
(A) 10.7 g
(B) 21.4 g
(C) 50.0 g
(D) 100. g | A | Multiple Choice | Biology-Chemistry | Senior High School |
420887 | Determine the geometry of the given species.
{eq}{{\text{O}}_{3}}
{/eq} | bent | String | Biology-Chemistry | Senior High School |
60521 | At a certain temperature, the solubility of strontium arsenate, {eq}\rm Sr_3(AsO_4)_2{/eq}, is 0.0590 g/L. What is the K{eq}_{sp}{/eq} of this salt at this temperature? | 1.66e-18 | Float | Biology-Chemistry | Senior High School |
2028735 | What volume of 4.5 M Acetic Acid is needed to neutralize 567.4 g sodium carbonate? | 2.37 L | Float | Biology-Chemistry | Senior High School |
1359898 | A non-hydrolyzable GTP analog can be used to prevent translation. What will be the FIRST step of translation affected by a non-hydrolyzable GTP analog?
a. The amino acid will not be attached to the tRNA.
b. The first amino acid-tRNA complex will not be able to bind the start codon and the ribosomal complex will not j... | b | Multiple Choice | Biology-Chemistry | University |
1628297 | Calculate the pOH of an aqueous solution with {eq}\left [ OH^- \right ] = 9.4 \times 10^{-13}
{/eq} M. | 12.02 | Float | Biology-Chemistry | Senior High School |
1505604 | Write the equilibrium constant expression for the given reaction in terms of activity, simplifying where appropriate.
{eq}2HNO_{2}(g)+3Cl_{2}(g)\rightleftharpoons 2NCl_{3}(g)+H_{2}(g)+2O_{2}(g)
{/eq} | Kc=[NCl3]^2[H2][O2]^2/[HNO2]^2[Cl2]^3 | Expression | Biology-Chemistry | University |
846948 | What should be the pH of a solution that contains 5.0 mL of 0.1 M acetic acid, 5.0 mL of 0.1 M sodium acetate, and 40.0 mL of {eq}H_2O
{/eq}? | 4.74 | Float | Biology-Chemistry | Senior High School |
2107763 | The reaction is second order. The initial concentration of A is 9.578 M and its half-life is 138 sec. How long will it take for the concentration of A to drop to 1/9 of its initial value? Answer in units of s | 1109 s | Integer | Biology-Chemistry | Senior High School |
1477247 | The mass of one Avogadro number of helium atom is? | 4.0026 g | Float | Biology-Chemistry | Senior High School |
1248432 | A weak monoprotic acid, HA dissociates by 1.698 % and has a pH of 3.73. Calculate the Ka value for the acid HA. Record your answer in scientific notation to 3 sig figs. | 3.22e-6 | Float | Biology-Chemistry | Senior High School |
140129 | Figure out the hybridization scheme for the central atom of {eq}\ XeO_2 \
{/eq}? | sp3 | String | Biology-Chemistry | Senior High School |
167504 | What is the concentration of {eq}OI^-
{/eq} in equilibrium with {eq}H_3O^+
{/eq} = 0.045 mol/L and {eq}HO^-
{/eq} = 0.527 mol/L? | 2.34e-10 M | Float | Biology-Chemistry | Senior High School |
1334629 | Do genetic mutations decrease diversity? | No | Boolean | Biology-Chemistry | Senior High School |
792588 | The manufacture of aluminum includes the production of cryolite (Na_3AlF_6) from the following reaction:
6HF + 3NaAlO_2 -->Na_3AlF_6 +3H_2O + Al_2O_3
How much NaAlO_2 (sodium aluminate) is required to produce 4.80 kg of Na_3AlF_6?
........kg | 5.6215 kg | Float | Biology-Chemistry | Senior High School |
344448 | Determine the oxidation state of the metal species in the complex.
({eq}CO(NH_3)_5Cl) Cl
{/eq}) | +2 | Integer | Biology-Chemistry | Senior High School |
1783 | What two systems are interfaced by the adrenal medulla? | Sympathetic nervous system and endocrine system | List | Biology-Chemistry | Senior High School |
1226737 | Use the following balanced net ionic equation to determine the volume of 6.0 M {eq}HNO_3
{/eq} needed to react completely with 5.00 g of copper.
{eq}8H^+(aq) + 2NO_3^-(aq) + 3Cu(s) \rightarrow 2NO(g) + 4H_2O(l) + 3Cu^{2+}(aq)
{/eq} | 35 mL | Integer | Biology-Chemistry | Senior High School |
1241890 | Complete combustion of {eq}7.00\ g
{/eq} of a hydrocarbon produced {eq}21.4\ g
{/eq} of {eq}\rm CO_2
{/eq} and {eq}10.2\ g
{/eq} of {eq}\rm H_2O
{/eq}. What is the empirical formula for the hydrocarbon? | C3H7 | String | Biology-Chemistry | Senior High School |
1611685 | A balloon holds 27.8 kg of helium. What is the volume of the balloon if the pressure is 0.97 atm and the temperature is 24{eq}^{o}
{/eq} C? | 1.747e5 L | Float | Biology-Chemistry | Senior High School |
1069616 | If 4 percent of a population carries a mutant allele a at a locus determined by a single gene (A/a) and if that mutant allele a in the homozygous state is lethal before birth, what is the frequency q of allele a in the population's gene pool? | 0.02 | Float | Biology-Chemistry | Senior High School |
1613870 | What is the pH of a solution that results from adding 0.059 mol Sr(OH)2 (s) to 1.57 L of a buffer comprised of 0.21 M HF and 0.21 M NaF? | 3.43 | Float | Biology-Chemistry | University |
213192 | The table below contains kinetics data for the reaction below at 1000 K:
{eq}2 NO_{(g)} + Cl_{2(g)} \rightarrow 2 NOCl_{(g)}
{/eq}
Experiment
Initial [NO] (M)
Initial [Cl2 ] (M)
Initial rate (M/s)
1
0.20
0.10
0.63
2
0.20
0.30
1.92
... | 7.875 | Float | Biology-Chemistry | Senior High School |
1179694 | Which level of the taxonomy contains the largest number of different types of organisms? | Eukaryotes | String | Biology-Chemistry | Senior High School |
1494557 | You are studying a population of 365 mayflies growing exponentially and track the size of the population over a period of 3 generations. If 34 offspring are born in the first generation and 7 individuals die in the first generation, then what is the population size (rounded to the nearest whole number) at the end of yo... | 456 | Integer | Biology-Chemistry | Senior High School |
58014 | A sample of oxygen gas occupies a volume of 6.90 L at 58.0 {eq}^o
{/eq}C and 1.09 atm. If it is desired to increase the volume of the gas sample to 8.27 L, while decreasing its pressure to 0.864 atm, the temperature of the gas sample at the new volume and pressure must be _____ {eq}^o
{/eq}C. | 41.5 | Float | Biology-Chemistry | Senior High School |
2107923 | What is the numerical probability that a random given genetic mutation will be spread and be preserved in a population once it happens in an individual? | 1/(2N) | Expression | Biology-Chemistry | University |
221919 | At 25 C only 0.0240 mol of the generic salt AB3 is soluble in 1.00 L of water. What is the Ksp of the salt at 25 C? | 8.96e-6 | Float | Biology-Chemistry | Senior High School |
843696 | A beaker contains {eq}\rm 50.0\ ml
{/eq} of {eq}\rm 0.953\ M
{/eq} solution of a diprotic acid. How many grams of {eq}\rm Mg(OH)_2
{/eq} are required to neutralize this solution? | 2.76 g Mg(OH)2 | Float | Biology-Chemistry | Senior High School |
263612 | Assume that you have 20.00 mL of 0.10 M dimethylamine ({eq}pK_b = 3.230
{/eq}) in an Erlenmeyer flask that is to be titrated with 0.15 M strong acid or base. What is the initial pH prior to adding any strong acid or base? | 11.89 | Float | Biology-Chemistry | University |
2063417 | Estimate the percentages of axial and equatorial conformations present at equilibrium in bromocyclohexane. | The percentage of equatorial- bromocyclohexane is about 70% and axial- bromocyclohexane is about 30% at the equilibrium. | Percentage | Biology-Chemistry | University |
2076027 | How to identify oxidized species, reduced species, oxidizing agent and reducing agent? | 1. Assign oxidation numbers to all atoms in the reaction.
2. Oxidized species: Oxidation number increases.
3. Reduced species: Oxidation number decreases.
4. Oxidizing agent: Same as reduced species.
5. Reducing agent: Same as oxidized species. | List | Biology-Chemistry | Senior High School |
894782 | What are the quantum numbers for electrons in the #4d# orbitals? | n=4; l=2; m_l = {-2, -1, 0, 1, 2}; m_s = {+1/2, -1/2} | List | Biology-Chemistry | Senior High School |
1182729 | Balance the redox reaction occurring in acidic aqueous solution.
{eq}NO^-_3(aq) + Sn^{2+}(aq) \rightarrow Sn^{4+}(aq) + NO(g)
{/eq} | 3Sn^2+(aq) + 2NO3^- (aq) + 8H^+ (aq) → 3Sn^4+ (aq) + 2NO(g) + 4H2O(l) | Expression | Biology-Chemistry | Senior High School |
1297900 | Reaction between sulfur and oxygen is: {eq}S+O_2 = SO_2
{/eq}.
How much sulfur is in the original materials, would result in 1000 g of {eq}SO_2
{/eq}? | 500 g | Float | Biology-Chemistry | Senior High School |
2017326 | Lead crystallizes in a face-centered cubic unit cell. The radius of a lead atom is 175 pm. Determine the density of lead in g/cm{eq}^3{/eq}. | 11.345 g/cm^3 | Float | Biology-Chemistry | University |
1578945 | A beaker with {eq}1.80x10^2
{/eq} mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 7.20 mL of a 0.460 M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.740. | -0.33 | Float | Biology-Chemistry | University |
1311441 | What is the mole-mole ratio (conversion factor) for {eq}CaI_2
{/eq} (calcium iodide) to {eq}Ca_3(PO_4)_2
{/eq} (calcium phosphate) in the following reaction?
{eq}3CaI_2(aq) + 2(NH_4)_3PO_4(aq) \to Ca_3(PO_4)_2(s) + 6NH_4I(aq)
{/eq} | 3:1 | Integer | Biology-Chemistry | Senior High School |
1205280 | The concentration of ammonium ion in the solution of the salt called ferrous ammonium sulfate, formula {eq}\displaystyle
(Fe(NH_4))_2(SO_4)_3
{/eq}, is 0.360 M.
What is the concentration of sulfate ions in this solution? | 0.720 M | Float | Biology-Chemistry | Senior High School |
882756 | How many moles of atoms are in x mol of CO2 (and a few others). Let X represent 5x10 raised to the -4 power. | 1.5e-3 mol atoms | Float | Biology-Chemistry | Senior High School |
23037 | What mass of iodine contains the same number of atoms as {eq}50.0 \, \mathrm{g}
{/eq} of chlorine? | 177.7 g | Float | Biology-Chemistry | Senior High School |
1403093 | True or false? Valence bond theory is useful in understanding the shapes of molecules. | true | Boolean | Biology-Chemistry | Senior High School |
187495 | If a male was under a lot of stress (elevated SNS activity), which of the following statements would be true given what is known about the regulation of the male sexual response?
A. It would be easier for them to achieve and maintain an erection.
B. They would reach the ejaculation stage more rapidly.
C. It would be... | F | Multiple Choice | Biology-Chemistry | University |
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