Question and answer
Methane, CH4, burns in oxygen gas to form water and carbon dioxide. What is the correct balanced chemical equation for this reaction? A. CH4 + O ? H2O + CO2 B. CH4 + 4O ? 2H2O + CO2 C. CH4 + O2
? H2O + CO2 D. CH4 + 2O2 ? 2H2O + CO2
D. CH4 + 2O2 ? 2H2O + CO2
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Original conversation
User: Methane, CH4, burns in oxygen gas to form water and carbon dioxide. What is the correct balanced chemical equation for this reaction? A. CH4 + O ? H2O + CO2 B. CH4 + 4O ? 2H2O + CO2 C. CH4 + O2 ? H2O + CO2 D. CH4 + 2O2 ? 2H2O + CO2

Weegy: D. CH4 + 2O2 ? 2H2O + CO2
cha97mw|Points 1097|

User: How many atoms are present in 3 moles of chromium? A. 6.02 x 1023 atoms B. 1.80 x 1023 atoms C. 1.80 x 1024 atoms D. 52.0 atoms

Weegy: C. 1.80 x 1024 atoms
Fanboy|Points 2031|

User: How many grams of CO2 are in 2.1 mol of the compound? A. 21.0 g B. 44.0 g C. 66.0 g D. 92.4 g

Weegy: 1 mole CO2 = 44.0096 grams CO2 (molar mass of CO2) Therefore, 2.1 mol CO2 x (44.0096 grams CO2/1 mole CO2) = 92.4 grams CO2 - > D
dcjones73075|Points 0|

User: An industrial process makes calcium oxide by decomposing calcium carbonate. Which of the following is NOT needed to calculate the mass of calcium oxide that can be produced from 4.7 kg of calcium carbonate? A. the balanced chemical equation B. molar masses of the reactants C. molar masses of the product D. the volume of the unknown mass

Weegy: D. the volume of the unknown mass
Expert answered|hernandezv86|Points 26|

User: The coefficients in a balanced chemical equation always can express the ratio of A. moles of reactants and products. B. volume of reactants and products. C. atoms of reactants and products. D. mass of reactants and products.

Weegy: The answer is A. moles of reactants and products.
Expert answered|hernandezv86|Points 26|

User: When magnesium carbonate, MgCO2, reacts with nitric acid, HNO3, it forms magnesium nitrate, Mg(NO3)2, and carbonic acid, H2CO3. Carbonic acid then breaks down into water and carbon dioxide. Which two types of reactions take place in this process? A. synthesis and decomposition B. single-replacement and combustion C. double-replacement and decomposition D. double-replacement and combustion

Weegy: C. double-replacement and decomposition
Expert answered|hernandezv86|Points 26|

User: Which of the following is NOT always true about a synthesis reaction? A. One product is formed. B. There is only one reactant. C. The general formula is A + B ? C. D. A reactant might be a compound, or it might be an element.

Weegy: B. There is only one reactant.
Expert answered|hernandezv86|Points 26|

User: In a chemical reaction, an iron atom became the ion Fe2+. What happened to the iron atom? A. It lost electrons and was oxidized. B. It lost electrons and was reduced. C. It gained electrons and was oxidized. D. It gained electrons and was reduced.

Weegy: A. It lost electrons and was oxidized
Expert answered|hernandezv86|Points 26|

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Asked 7/2/2012 12:22:13 PM
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When magnesium carbonate, MgCO2, reacts with nitric acid, HNO3, it forms magnesium nitrate, Mg(NO3)2, and carbonic acid, H2CO3. Carbonic acid then breaks down into water and carbon dioxide. Which two types of reactions take place in this process? A. synthesis and decomposition B. single-replacement and combustion C. double-replacement and decomposition D. double-replacement and combustion
Weegy: C. double-replacement and decomposition User: For the chemical reaction C2H6 + 137 kJ ? C2H4 + H2, the chemical energy of the A. reactant is greater than the chemical energy of the products. B. products is greater than the chemical energy of the reactant. C. reactant and the chemical energy of the products are equal. D. reaction is conserved. Weegy: B. [ products is greater than the chemical energy of the reactant. moles = mass / molar mass moles HBr = 186 g / 80.908 g/mol = 2.3 moles TRUE C2H6 + 137 kJ - - -> C2H4 + H2 You can see that the energy (137 kJ) is on the reactant side of the equation. So you have to put energy into the reaction to to form the prodicts. Therefore the products must have a higher energy then the reactants = B ] (More)
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Expert Answered
Asked 7/2/2012 12:53:37 PM
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For the chemical reaction C2H6 + 137 kJ ? C2H4 + H2, the chemical energy of the A. reactant is greater than the chemical energy of the products. B. products is greater than the chemical energy of the reactant. C. reactant and the chemical energy of the products are equal. D. reaction is conserved.
Weegy: B rasing temp is equivalent to adding heat and by La Chat rnx shifts to right User: For the chemical reaction C2H6 + 137 kJ ? C2H4 + H2, the chemical energy of the A. reactant is greater than the chemical energy of the products. B. products is greater than the chemical energy of the reactant. C. reactant and the chemical energy of the products are equal. D. reaction is conserved. Weegy: D. reaction is conserved. (More)
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Expert Answered
Asked 7/2/2012 1:26:21 PM
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