Datasets:
Tasks:
Text Generation
Modalities:
Text
Formats:
json
Languages:
English
Size:
10K - 100K
Tags:
chemistry
License:
id stringlengths 10 10 | messages listlengths 2 2 | metadata dict |
|---|---|---|
bsc_006271 | [
{
"role": "user",
"content": "A 6.4 g sample of copper is produced by heating copper(II) oxide with hydrogen gas according to the equation: CuO + H₂ → Cu + H₂O. Given the molar masses Cu = 63.5 g/mol and CuO = 79.5 g/mol, calculate the mass of copper(II) oxide that reacted."
},
{
"role": "assistant"... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_002421 | [
{
"role": "user",
"content": "For the reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g), the equilibrium constant Kc is 0.50. In an equilibrium mixture, the concentrations are [N₂] = 0.10 M and [H₂] = 0.20 M. Calculate the equilibrium concentration of NH₃ in mol/L."
},
{
"role": "assistant",
"content": "<think>... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_000357 | [
{
"role": "user",
"content": "A 7.8 g mixture of methane (CH₄) and ethane (C₂H₆) is completely burned in excess oxygen. The carbon dioxide produced is collected at STP and occupies 11.2 L. Calculate the mass of methane in the original mixture. (Molar masses: CH₄ = 16 g/mol, C₂H₆ = 30 g/mol; molar volume at ... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_008875 | [
{
"role": "user",
"content": "When 5.6 g of ethene (C₂H₄) is completely burned in excess oxygen, what volume of carbon dioxide gas is produced at STP? (Molar mass of C₂H₄ = 28 g/mol; molar volume at STP = 22.4 L/mol; balanced equation: C₂H₄ + 3O₂ → 2CO₂ + 2H₂O)"
},
{
"role": "assistant",
"conten... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_002805 | [
{
"role": "user",
"content": "The combustion of methane follows the equation: CH₄ + 2O₂ → CO₂ + 2H₂O. When 11.2 L of methane is completely burned at STP, what mass of carbon dioxide is produced? (Molar masses: C = 12, O = 16, H = 1; molar volume at STP = 22.4 L/mol)"
},
{
"role": "assistant",
"c... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_012410 | [
{
"role": "user",
"content": "The combustion of ethanol (C₂H₅OH) can be represented by the unbalanced equation: C₂H₅OH + O₂ → CO₂ + H₂O. Balance this equation. If 2.00 moles of ethanol are completely burned, calculate the mass of water produced. Molar mass of H₂O = 18.0 g/mol."
},
{
"role": "assista... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_004033 | [
{
"role": "user",
"content": "What mass of sodium hydroxide (NaOH, molar mass = 40 g/mol) is required to completely neutralize 250 mL of a 0.2 mol/L sulfuric acid (H₂SO₄) solution, given the reaction: H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O?"
},
{
"role": "assistant",
"content": "<think>\nWe need to find ... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_005937 | [
{
"role": "user",
"content": "A 5.0 g sample of ethanol (C₂H₅OH, molar mass = 46 g/mol) is completely combusted to heat 200 g of water from 20 °C to 65 °C. Given the specific heat capacity of water is 4.18 J/(g·°C), calculate the enthalpy of combustion of ethanol in kJ/mol."
},
{
"role": "assistant"... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_012235 | [
{
"role": "user",
"content": "If 28 g of nitrogen gas (N₂) is reacted with excess hydrogen gas (H₂) according to the equation N₂ + 3H₂ → 2NH₃, and all the ammonia produced is dissolved in 200 cm³ of water, what is the concentration of the ammonia solution in mol/dm³? (Molar masses: N₂ = 28 g/mol, NH₃ = 17 g... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_000279 | [
{
"role": "user",
"content": "Ethanol (C₂H₅OH) burns in excess oxygen according to the equation C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O. Using the atomic masses C = 12, H = 1, O = 16, calculate the mass of carbon dioxide produced when 3.0 g of ethanol is completely burned."
},
{
"role": "assistant",
"content... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_000082 | [
{
"role": "user",
"content": "When 20.0 g of sodium hydroxide (NaOH) is reacted with 25.0 g of hydrochloric acid (HCl) according to the equation NaOH + HCl → NaCl + H₂O, calculate the mass of sodium chloride (NaCl) produced. Molar masses: NaOH = 40 g/mol, HCl = 36.5 g/mol, NaCl = 58.5 g/mol."
},
{
"... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_011225 | [
{
"role": "user",
"content": "A 50.0 mL solution of sulfuric acid (H₂SO₄) with a concentration of 0.20 mol/L is completely neutralized by 40.0 mL of sodium hydroxide (NaOH) solution. Calculate the molar concentration of the sodium hydroxide solution."
},
{
"role": "assistant",
"content": "<think... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_007354 | [
{
"role": "user",
"content": "When 50.0 mL of 0.100 M NaCl solution is mixed with excess silver nitrate, a precipitate of silver chloride forms. Calculate the mass of silver chloride precipitate formed. (Molar mass of AgCl = 143.5 g/mol)"
},
{
"role": "assistant",
"content": "<think>\nWe need to... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_001467 | [
{
"role": "user",
"content": "The specific heat capacity of water is 4.18 J/g°C. The enthalpy of combustion of ethanol is -1367 kJ/mol, and its molar mass is 46 g/mol. Calculate the mass of ethanol, in grams, required to heat 200 g of water from 20°C to 80°C, assuming all the heat released from combustion i... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_007113 | [
{
"role": "user",
"content": "A student pours 200 g of water at 80 °C into a calorimeter containing 300 g of water at 20 °C. Assuming no heat is lost to the surroundings and the specific heat capacity of water is 4.18 J/g·°C, calculate the final equilibrium temperature of the mixture."
},
{
"role": ... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_010230 | [
{
"role": "user",
"content": "A solution is prepared by dissolving 5.85 g of NaCl in water and diluting to a total volume of 250 mL. If 50.0 mL of this solution is treated with excess silver nitrate solution, what mass of silver chloride precipitate is formed? (Molar masses: NaCl = 58.5 g/mol, AgCl = 143.5 ... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_010887 | [
{
"role": "user",
"content": "When 6.5 g of zinc (Zn) is added to 50 mL of 1.0 M sulfuric acid (H₂SO₄), the reaction Zn + H₂SO₄ → ZnSO₄ + H₂ occurs. Given the molar masses: Zn = 65.4 g/mol, H₂SO₄ = 98.1 g/mol, ZnSO₄ = 161.4 g/mol, H₂ = 2.0 g/mol, what mass of hydrogen gas is produced?"
},
{
"role": ... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_011188 | [
{
"role": "user",
"content": "A solution is prepared by diluting 10.0 mL of 0.50 M hydrochloric acid (HCl) to a total volume of 250 mL. Assuming complete dissociation of HCl, what is the pH of the resulting solution? (You may use log 2 ≈ 0.30.)"
},
{
"role": "assistant",
"content": "<think>\nWe ... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_005291 | [
{
"role": "user",
"content": "Zinc reacts with excess hydrochloric acid according to the equation Zn + 2HCl → ZnCl₂ + H₂. A sample of zinc is reacted, and the hydrogen gas produced is collected over water at 25°C. The total pressure of the gas mixture is 101.3 kPa, and the volume collected is 245 mL. The va... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_005163 | [
{
"role": "user",
"content": "A student mixes 50.0 cm³ of 1.00 mol/dm³ hydrochloric acid (HCl) with 50.0 cm³ of 1.00 mol/dm³ sodium hydroxide (NaOH) in a simple calorimeter. The temperature of the mixture rises from 25.0 °C to 31.8 °C. Assuming the density of both solutions is 1.00 g/cm³ and the specific he... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_003068 | [
{
"role": "user",
"content": "A solution is prepared by dissolving 25.0 g of sodium sulfate (Na₂SO₄) in water, and another solution contains 30.0 g of barium chloride (BaCl₂) dissolved in water. The two solutions are mixed, resulting in a double displacement reaction that forms a white precipitate of barium... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_008425 | [
{
"role": "user",
"content": "Calculate the mass of carbon dioxide produced when 8.0 g of methane (CH4) is completely burned in excess oxygen. (Molar mass of CH4 = 16 g/mol, molar mass of CO2 = 44 g/mol)"
},
{
"role": "assistant",
"content": "<think>\nWe need to find the mass of CO₂ produced whe... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_010167 | [
{
"role": "user",
"content": "A 50.0 g sample of water (specific heat capacity = 4.18 J/g·°C) is heated from 22.0°C to 88.5°C using a burner. If the same amount of heat released by burning ethanol (enthalpy of combustion = −1367 kJ/mol) is completely transferred to the water, calculate the mass of ethanol b... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_006659 | [
{
"role": "user",
"content": "How many grams of oxygen are needed to completely burn 3.2 g of methane (CH₄)? The molar mass of CH₄ is 16 g/mol and the molar mass of O₂ is 32 g/mol."
},
{
"role": "assistant",
"content": "<think>\nWe need to find the mass of oxygen required to completely burn 3.2 ... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_012302 | [
{
"role": "user",
"content": "A student dissolves 5.85 g of sodium chloride (NaCl, molar mass = 58.5 g/mol) in 100 g of water. The temperature of the water drops from 25.0 °C to 23.5 °C. Assuming the specific heat capacity of the solution is 4.18 J/(g·°C) and no heat is lost to the surroundings, calculate t... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_012343 | [
{
"role": "user",
"content": "A 25.0 cm³ sample of a 0.20 mol/dm³ hydrogen peroxide (H₂O₂) solution is decomposed completely using manganese(IV) oxide as a catalyst. Calculate the volume of oxygen gas produced at room temperature and pressure (RTP), given that the molar volume of a gas at RTP is 24.0 dm³/mo... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_007203 | [
{
"role": "user",
"content": "A 25.0 cm³ sample of 0.200 mol/dm³ hydrochloric acid is exactly neutralized by 50.0 cm³ of a sodium hydroxide solution. Calculate the mass of sodium hydroxide dissolved in the 50.0 cm³ of solution. (Molar mass of NaOH = 40.0 g/mol)"
},
{
"role": "assistant",
"conten... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_000959 | [
{
"role": "user",
"content": "When 4.6 g of ethanol (C₂H₅OH, molar mass = 46 g/mol) is completely burned, the heat released is used to warm 200.0 g of water. Given that the combustion of ethanol releases 1367 kJ of energy per mole, calculate the temperature increase of the water. (Specific heat capacity of ... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_000799 | [
{
"role": "user",
"content": "How much heat is released when 13.5 g of aluminum is completely reacted with excess iron(III) oxide according to the equation: 2Al + Fe₂O₃ → Al₂O₃ + 2Fe? The molar mass of aluminum is 27.0 g/mol, and the enthalpy change for the reaction is ΔH = −852 kJ per 2 moles of aluminum r... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_009708 | [
{
"role": "user",
"content": "The combustion of methanol can be represented by the equation: 2CH₃OH + 3O₂ → 2CO₂ + 4H₂O. The enthalpy of combustion of methanol is -726 kJ/mol. When a certain amount of methanol is burned, 14.4 kJ of heat is released. Calculate: (a) the mass of methanol burned (molar mass of ... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_007447 | [
{
"role": "user",
"content": "2.4 g of magnesium is heated in a stream of chlorine gas until all the magnesium reacts to form magnesium chloride. The resulting magnesium chloride is dissolved in water, and an excess of silver nitrate solution is added, causing a precipitation reaction. Calculate the mass of... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_005210 | [
{
"role": "user",
"content": "A sample of potassium chlorate (KClO₃) is heated until it decomposes completely according to the equation: 2KClO₃ → 2KCl + 3O₂. If 6.72 L of oxygen gas is collected at STP, what mass of KClO₃ was decomposed? (Molar mass of KClO₃ = 122.5 g/mol; molar volume of a gas at STP = 22.... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_001552 | [
{
"role": "user",
"content": "A solution is prepared by diluting 50.0 cm³ of 2.0 mol/dm³ sulfuric acid (H₂SO₄) with distilled water. What volume of water, in cm³, must be added so that the final concentration of the acid becomes 0.50 mol/dm³? Assume the volumes are additive."
},
{
"role": "assistant... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_000580 | [
{
"role": "user",
"content": "When 10.0 g of calcium carbonate (CaCO₃) is heated strongly, it decomposes into calcium oxide (CaO) and carbon dioxide (CO₂). Calculate the volume of CO₂ gas produced at STP. (Molar mass of CaCO₃ = 100 g mol⁻¹; molar volume of a gas at STP = 22.4 L mol⁻¹)"
},
{
"role": ... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_008674 | [
{
"role": "user",
"content": "When 6.5 g of zinc is added to 100.0 mL of 2.0 M hydrochloric acid, what volume of hydrogen gas is produced at STP? (Molar masses: Zn = 65.4 g/mol, H = 1.0, Cl = 35.5; molar volume at STP = 22.4 L/mol)"
},
{
"role": "assistant",
"content": "<think>\nWe have the reac... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_006508 | [
{
"role": "user",
"content": "A 50.0 g sample of water at 20.0 °C is heated until its temperature reaches 80.0 °C. Given that the specific heat capacity of water is 4.18 J/(g·°C) and the molar mass of water is 18.0 g/mol, calculate the total amount of heat absorbed by the water in joules."
},
{
"rol... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_006421 | [
{
"role": "user",
"content": "The standard enthalpy of formation of ethanol (C₂H₅OH) is −277.7 kJ/mol, and the standard enthalpy of formation of liquid water is −285.8 kJ/mol. When 4.6 g of ethanol is completely burned in excess oxygen, the products are carbon dioxide gas and liquid water. Given that the st... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_011960 | [
{
"role": "user",
"content": "How much volume (in mL) of 0.5 M NaOH solution (molar mass of NaOH = 40 g/mol) is required to completely neutralize 25 mL of 0.4 M H₂SO₄ solution?"
},
{
"role": "assistant",
"content": "<think>\nWe need to find the volume of 0.5 M NaOH required to neutralize 25 mL o... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_009724 | [
{
"role": "user",
"content": "Methane burns in excess oxygen according to the equation CH₄ + 2O₂ → CO₂ + 2H₂O. When a certain volume of methane is burned, 240 cm³ of carbon dioxide is produced at room temperature and pressure (RTP), where the molar volume is 24 dm³/mol. Calculate (a) the volume of methane u... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_003925 | [
{
"role": "user",
"content": "25.0 cm³ of a 0.10 mol/dm³ sodium hydroxide solution is exactly neutralized by 20.0 cm³ of a hydrochloric acid solution. Calculate the concentration of the hydrochloric acid in mol/dm³. (Na = 23, O = 16, H = 1, Cl = 35.5)"
},
{
"role": "assistant",
"content": "<thin... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_006529 | [
{
"role": "user",
"content": "When 12.0 g of magnesium is heated with 8.0 g of oxygen gas, the maximum possible mass of magnesium oxide (MgO) is produced. Given that the molar masses are Mg = 24 g/mol, O = 16 g/mol, and MgO = 40 g/mol, calculate the mass of magnesium oxide formed."
},
{
"role": "ass... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_000182 | [
{
"role": "user",
"content": "The Haber process synthesizes ammonia according to the equation: N₂ + 3H₂ → 2NH₃. If a factory starts with 28.0 kg of nitrogen gas (N₂, molar mass = 28.0 g/mol) and an excess of hydrogen gas, what volume of ammonia gas (NH₃) is produced at standard temperature and pressure (STP... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_002802 | [
{
"role": "user",
"content": "The bond dissociation energies are: H–H = 436 kJ/mol, Br–Br = 193 kJ/mol, H–Br = 366 kJ/mol. Calculate the enthalpy change (ΔH) for the reaction: H₂(g) + Br₂(g) → 2HBr(g)."
},
{
"role": "assistant",
"content": "<think>\nTo calculate the enthalpy change using bond di... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_012499 | [
{
"role": "user",
"content": "What mass of water (specific heat capacity 4.18 J/g·°C) can be heated from 25.0 °C to 45.0 °C by the combustion of 4.6 g of ethanol (C₂H₅OH), given that the molar mass of ethanol is 46 g/mol and its enthalpy of combustion is −1367 kJ/mol? Assume all the heat released is absorbe... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_001971 | [
{
"role": "user",
"content": "When zinc reacts with dilute sulfuric acid, hydrogen gas is produced according to the equation: Zn + H₂SO₄ → ZnSO₄ + H₂. Calculate the volume of hydrogen gas measured at STP that is produced when 6.5 g of zinc reacts completely. (Molar mass of Zn = 65.4 g/mol; molar volume of a... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_003707 | [
{
"role": "user",
"content": "Using the bond energies (H–H: 436 kJ/mol, O=O: 498 kJ/mol, H–O: 463 kJ/mol), calculate the enthalpy change (in kJ) for the reaction: 2H₂ + O₂ → 2H₂O."
},
{
"role": "assistant",
"content": "<think>\nWe need to calculate the enthalpy change using bond energies.\n\nThe... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_002928 | [
{
"role": "user",
"content": "When 50.0 mL of 1.00 M HCl(aq) is mixed with 50.0 mL of 1.00 M NaOH(aq) in a coffee-cup calorimeter, the temperature increases from 22.0°C to 28.9°C. The density of the resulting solution is 1.00 g/mL, and its specific heat capacity is 4.18 J/(g·°C). Assuming no heat loss, calc... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_002226 | [
{
"role": "user",
"content": "A 6.8 g sample of hydrogen peroxide (H₂O₂) decomposes completely according to the equation: 2H₂O₂ → 2H₂O + O₂. Using the molar masses H = 1, O = 16, and the molar gas volume at STP = 22.4 dm³/mol, calculate the volume of oxygen gas produced at STP."
},
{
"role": "assist... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_010562 | [
{
"role": "user",
"content": "The combustion of methane is represented by the equation: CH₄ + 2O₂ → CO₂ + 2H₂O. The enthalpy of combustion of methane is -890 kJ/mol. Given that the molar mass of methane is 16.0 g/mol, calculate the energy released when 4.0 g of methane is completely burned."
},
{
"r... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_009754 | [
{
"role": "user",
"content": "A 100 g copper block heated to 100 °C is placed into 200 g of water at 20 °C in a perfectly insulated container. Given that the specific heat capacity of copper is 0.385 J/(g·°C) and the specific heat capacity of water is 4.18 J/(g·°C), calculate the final equilibrium temperatu... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_004507 | [
{
"role": "user",
"content": "How much heat is released when 11.2 g of iron reacts with excess chlorine gas to form iron(III) chloride, given that the enthalpy change for the reaction 2Fe(s) + 3Cl₂(g) → 2FeCl₃(s) is ΔH = −799 kJ? (Molar mass of Fe = 56 g/mol)"
},
{
"role": "assistant",
"content"... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_010716 | [
{
"role": "user",
"content": "A student burned 0.46 g of ethanol (C₂H₅OH, molar mass 46 g/mol) in a calorimeter to heat 200 g of water. The temperature of the water rose from 20.0 °C to 45.0 °C. Assuming no heat loss and using the specific heat capacity of water as 4.18 J/(g·°C), calculate the enthalpy of c... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_007566 | [
{
"role": "user",
"content": "A sample of hydrogen gas (H₂) reacts completely with oxygen gas (O₂) according to the equation: 2H₂ + O₂ → 2H₂O. The molar mass of H₂ is 2 g/mol, and the molar volume of a gas at STP is 22.4 L/mol. If 4.0 g of H₂ is used, what volume of O₂ at STP is required for the reaction?"
... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_007055 | [
{
"role": "user",
"content": "When 9.2 g of ethanol (C₂H₅OH) is completely combusted in excess oxygen, what volume of carbon dioxide is produced at STP? (Molar mass of ethanol = 46 g/mol, molar volume at STP = 22.4 L/mol)"
},
{
"role": "assistant",
"content": "<think>\nFirst, I need to write the... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_006340 | [
{
"role": "user",
"content": "When 6.5 g of zinc (Zn, molar mass = 65 g/mol) is added to excess hydrochloric acid, the reaction Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g) occurs. Given that the enthalpy change for this reaction is −153.9 kJ per mole of Zn, calculate the amount of heat released when 6.5 g of zinc ... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_006149 | [
{
"role": "user",
"content": "A 2.5 g sample of sodium hydroxide (NaOH) is dissolved in water. What volume of 0.5 M hydrochloric acid (HCl) is required to completely neutralize this sodium hydroxide? (Molar mass of Na = 23 g/mol, O = 16 g/mol, H = 1 g/mol)"
},
{
"role": "assistant",
"content": "... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_003344 | [
{
"role": "user",
"content": "A 25.0 mL sample of 0.2 M NaOH solution is exactly neutralized by 20.0 mL of an HCl solution. Calculate the molar concentration of the HCl solution. (Reaction: NaOH + HCl → NaCl + H₂O)"
},
{
"role": "assistant",
"content": "<think>\nThis is a straightforward acid-ba... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_001421 | [
{
"role": "user",
"content": "Ethanol (C₂H₅OH) undergoes complete combustion according to the equation: C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O. Using atomic masses H = 1, C = 12, O = 16, and a molar gas volume of 24 dm³ at room temperature, calculate the mass and the volume at room temperature of carbon dioxide produce... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_003862 | [
{
"role": "user",
"content": "Calculate the energy released when 10.0 g of liquid ethanol (C₂H₅OH) is completely burned in excess oxygen, given that the combustion reaction is: C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l) with an enthalpy change of –1367 kJ/mol, and the molar mass of ethanol is 46.0 g/mol."
},
... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_007638 | [
{
"role": "user",
"content": "A student needs to prepare 250 mL of a 0.40 M potassium nitrate (KNO₃) solution. Calculate the mass of potassium nitrate required. (Molar mass of KNO₃ = 101 g/mol)"
},
{
"role": "assistant",
"content": "<think>\nThis is a straightforward solution preparation problem... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_006101 | [
{
"role": "user",
"content": "What volume (in mL) of 0.50 M HCl solution is required to completely neutralize 25.0 mL of 0.20 M NaOH solution?"
},
{
"role": "assistant",
"content": "<think>\nThis is a straightforward acid-base neutralization problem.\n\nThe reaction is:\nHCl + NaOH → NaCl + H₂O\... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_008245 | [
{
"role": "user",
"content": "A solution contains 5.9 g of silver nitrate (AgNO3, molar mass = 170 g/mol) and another solution contains 2.34 g of sodium chloride (NaCl, molar mass = 58.5 g/mol). When these solutions are mixed, the following reaction occurs: AgNO3 + NaCl -> AgCl + NaNO3. Given that the molar... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_007684 | [
{
"role": "user",
"content": "When 2.4 g of magnesium reacts completely with excess hydrochloric acid, hydrogen gas is produced. Calculate the volume of hydrogen gas measured at room temperature and pressure (RTP), where the molar volume is 24 dm³/mol. (Molar mass of Mg = 24 g/mol)"
},
{
"role": "as... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_003334 | [
{
"role": "user",
"content": "A 25.0 cm³ volume of 0.20 M sodium hydroxide solution is completely neutralized by sulfuric acid. What mass of sulfuric acid is consumed? (Molar masses: NaOH = 40.0 g/mol, H₂SO₄ = 98.1 g/mol)"
},
{
"role": "assistant",
"content": "<think>\nWe are given: \"A 25.0 cm³... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_000353 | [
{
"role": "user",
"content": "When 1.0 g of ethanol is completely burned, the heat released is used to warm 200 g of water. The molar mass of ethanol is 46 g/mol, and the combustion of 1 mole of ethanol releases 1367 kJ of energy. The specific heat capacity of water is 4.18 J/(g·°C). Calculate the increase ... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_009990 | [
{
"role": "user",
"content": "In the reaction 2H₂ + O₂ → 2H₂O, how many grams of water are produced when 11.2 L of hydrogen gas is burned at STP? (Molar volume at STP = 22.4 L/mol, Molar mass of H₂O = 18 g/mol)"
},
{
"role": "assistant",
"content": "<think>\nLet me solve this step-by-step.\n\nGi... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_004978 | [
{
"role": "user",
"content": "In a reaction, ethanol and ethanoic acid react according to the equation: C₂H₅OH + CH₃COOH → CH₃COOC₂H₅ + H₂O. If 4.6 g of ethanol and 6.0 g of ethanoic acid are mixed, calculate the maximum mass of ethyl acetate produced. (Molar masses: C₂H₅OH = 46, CH₃COOH = 60, CH₃COOC₂H₅ = ... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_008422 | [
{
"role": "user",
"content": "When 4.60 g of ethanol (C₂H₅OH, molar mass = 46.0 g/mol) is completely burned, it releases 1367 kJ of energy per mole of ethanol. The specific heat capacity of water is 4.18 J/(g·°C). If the heat released from burning 4.60 g of ethanol is used to heat 500.0 g of water (assuming... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_012578 | [
{
"role": "user",
"content": "When 5.4 g of calcium chloride (CaCl₂, molar mass = 111 g/mol) is dissolved in 100 cm³ of water, the temperature of the solution rises from 22.0 °C to 37.4 °C. Assuming the density of water is 1.0 g/cm³ and the specific heat capacity of the solution is 4.2 J/(g·°C), calculate t... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
bsc_004540 | [
{
"role": "user",
"content": "When 50.0 mL of 0.200 M BaCl₂ solution is mixed with 75.0 mL of 0.150 M Na₂SO₄ solution, a white precipitate of barium sulfate (BaSO₄) forms. Given the molar masses: Ba = 137.3 g/mol, S = 32.1 g/mol, O = 16.0 g/mol, Na = 23.0 g/mol, Cl = 35.5 g/mol. (a) Write the balanced chemi... | {
"topic": "Basic School Chemistry",
"generation_model": "Ling-3.0-Flash"
} |
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The preview version provides access to one of the subtopics, Basic School Chemistry
Info
Difficulty: easy-medium.
Size: 12,601 rows.
Generation Model: Ling-3.0-Flash (Both questions and answers were compiled using Ling-3.0-Flash).
Data Structure
| Field | Type | Description |
|---|---|---|
id |
string | Stable sample identifier. |
messages |
list | Conversation with user prompt and assistant response. |
metadata |
object | Generation metadata, including topic, and generation_model. |
The entire dataset has undergone high-quality semantic deduplication. Of the 30k regular questions, only 12.6k of the clean ones remained.
A dataset with the full scope of planned topics will be released soon.
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