How can you identify a combustion reaction? a. The products contain CO_2 and H_2

Question

How can you identify a combustion reaction? a. The products contain CO_2 and H_2 O b. There is oxygen gas present in the reactants c. There is a hydrocarbon (molecule containing C and H) in the reactants d. There is a release of heat e. All of the above What is the difference between an empirical formula and a molecular formula? a. The empirical formula always has an atom with no subscript b. The molecular formula always has at least 4 atoms in it c. The empirical formula is the lowest whole number ratio of the elements present d. None of the above How many atoms are in one mole of CH_3 OH? a. 6 b. 6.0 times 10^23 c. 12.0 times 10^23 d. 3.6 times 10^24 e. 3 A synthesis reaction always: a. ends up with one product b. starts off as one product c. switches out one element from a compound d. has oxygen in the reactants How many atoms are within one molecule of C_3 H_8? a. 2 b. 7 c. 11 d. 24 According to the law of conservation of mass, the total mass of the reactants is: a. always more than the total mass of the products b. always less than the total mass of the products c. sometimes more and sometimes less than the total mass of the products d. always equal to the total mass of the products Which one of the samples contains the most atoms? a. 1 mol of CO_2 b. 1 mol of UF_6 c. 1 mol of CH_3 COCH_3 d. 1 mol of He e. same A decomposition reaction can be compared to: a. two dancing couples switching partners b. eight couples doing a square dance c. a dancing couple breaking up d. two single people joining for a dance Which one of the samples contains the most molecules? a. 1 mol of CO_2 b. 1 mol of UF_6 c. 1 mol of CH_3 COCH_3 d. 1 mol of He e. same Combustion reactions always: a. use only one reactant b. form only one product c. involve an element an ionic compound d. require oxygen gas

Explanation / Answer

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

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