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 + CO2Weegy:
D. CH4 + 2O2 ? 2H2O + CO2 Auto answered|Score 1|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 atomsWeegy:
C. 1.80 x 1024 atomsAuto answered|Score .6|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)
2.1 mol CO2 x (44.0096 grams CO2/1 mole CO2) = 92.4 grams CO2 - > DAuto answered|Score 1|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 massWeegy:
D. the volume of the unknown massExpert 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 combustionWeegy:
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 oxidizedExpert answered|hernandezv86|Points 26|
All Categories|No Subcategories|Expert answered|Rating 1| 7/2/2012 12:22:13 PM