Note: Above question is incomplete. Complete question is
<span>What type of chemical reaction is so3(g) + h2o(l) → h2so4(aq)
a) Neutralization
b) Decomposition
c) Combination
d) Single displacement reaction
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Solution:
In current context, following things may be noted
1) Neutralization reactions: In neutralization reactions, acid and base combine to form salt and water.
b) Decomposition reaction: R</span><span>eaction in which a single substance broken down two or more smaller substances is refereed as decomposition reaction. Decomposition reactions are characterized be present of single molecule on reactant side.
c) Combination reaction: In a recombination reaction</span><span> two or more molecules combine to form a single product.
d) Single displacement reaction: R</span><span>eaction in which an element within a compound is displaced by a another element is referred as single displacement reaction.
Above reaction satisfies the criteria of combination reaction, hence correct answer is option C, combination. </span>
The dissolution<span> of </span>calcium chloride<span> in </span>water<span>. </span>CaCl2(s<span>)--> </span>Ca^2+ (aq) +2 Cl^-1<span> (</span>aq<span>). A) </span>Use<span> the </span>data<span> from</span>appendix C<span>. and </span>below<span> to </span>determine Delta H<span> of </span>formation<span> in </span>kj/mol<span> for this </span>process<span> (</span>deltaH(Ca^2+(aq)=-542.8 kj/mol<span>).</span>
To determine the number of formula units in a sample of a compound you need to divide the number of grams by the formula mass. The formula mass of NaCl is 23 g/mol + 35.5 g/mol = 58.5 g/mol, and the number of grams of the sample is 0.14 mg * 1 g/ 1000 mg = 0.00014 g. Then the answer is 0.00014 g / 58.5 g = 2.30 * 10^ -6, which rounded to two significant figures is 2.4 * 10^ -6. So<span> the answer is 2.4 * 10^-6 or 0.0000024</span>
the mass of ice taken = 10 g
the mass of water = 250 g
initial temperature of water = 20 C
the final temperature of water = 16. 8 C
specific heat of water = 4.18 J/g*K
the heat absorbed by ice to melt = heat loss by water
heat loss by water = mass X specific heat of water X change in temperature
heat loss by water = 250 X 4.18 X (20-16.8) = 3344 Joules
heat gained by ice = 3344 J
heat gained by ice = enthalpy of fusion X moles of ice
moles of ice = mass / molar mass = 10 / 18 = 0.56 moles
enthalpy of fusion = 3344 / 0.56 = 5971.43 J / mole
A. because a chemical change is something that's changing
