anonymous
  • anonymous
What is always true of a combustion reaction? Oxygen gas must be one of the reactants Carbon monoxide will be produced The reaction absorbs energy One reactant must contain chlorine
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
can some please answerthis thanks
anonymous
  • anonymous
@iambatman @myininaya
anonymous
  • anonymous
@dan815 @vera_ewing

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anonymous
  • anonymous
@zepdrix @Haseeb96
anonymous
  • anonymous
The reactants of a combustion reaction are a fuel oxygen gas. When the fuel is organic the products are carbon dioxide and water. The reaction releases heat (energy).
anonymous
  • anonymous
@peachpi what would choice be
Photon336
  • Photon336
Carbon monoxide is the result of incomplete combustion, a combustion reaction where there's a lack of oxygen
Photon336
  • Photon336
Oxygen gas must be one of the reactants for this reaction to happen.
anonymous
  • anonymous
can you do this ? @photon336 Which answer best completes the sentence below? An example of a physical property is _____, while an example of a chemical property is _____. mass, volume color, boiling point density, reactivity flammability, length
Photon336
  • Photon336
The way I understand it is that a Chemical property is one at the molecular level where the bonds are broken and formed to result in a new compound or substance, and its identity is changed. I believe density and reactivity are the best choices. reactivity is just as it implies, how something will react, that's definitely a chemical property,
anonymous
  • anonymous
okay what about this If the reaction of 3.50 moles of lithium with excess hydrofluoric acid was able to produce 1.32 mol H2, what is the precent yield of the reaction? Unbalanced equation: Li + HF yields LiF + H2 75.4% 37.7% 18.9% 13.3%
anonymous
  • anonymous
@Photon336
Photon336
  • Photon336
Do you know how to balance the equation?
anonymous
  • anonymous
alittle but but would the answer b the second choice ?
Photon336
  • Photon336
Let's first balance it \[2Li + 2Hf --> 2LIF +H2\]
Photon336
  • Photon336
Count the number of atoms on both sides, you see in the unbalanced you have 2 atoms of hydrogen on one side and one atom on the other so you multiply by two.
anonymous
  • anonymous
Li + HF yields LiF + H2
anonymous
  • anonymous
=2 Li + 2 HF = 2 LiF + H2
anonymous
  • anonymous
@Photon336
Photon336
  • Photon336
We know that HF is in excess so to do the calculation we need to use the limiting reagent the one that runs out in our case that's lithium. The molar ratio is 2:1 so we should theoretically get 3.50 li x (H2/2Li) = 1.75 mol of H2 from the equation. What we actually get is 1.32 So it's what you get form experiment over stiochiometry 1.32/1.75
Photon336
  • Photon336
And that's 75.4%
Photon336
  • Photon336
Does this make sense how I got it, you always have to balance your equation before you do any calculation
anonymous
  • anonymous
yes
anonymous
  • anonymous
okay what about this u know the answr? Which of the following is a double replacement reaction? K2S + CoCl2 yields 2KCl + CoS Ca + 2H2O yields Ca(OH)2 + H2 CaO + H2O yields Ca(OH)2 2KClO3 yields 2KCl + 3O2
anonymous
  • anonymous
@Photon336
Photon336
  • Photon336
Here's what happens in a double replacement reaction: AB + CD ---> AC + BD see what happened?
anonymous
  • anonymous
ya so it would b c
Photon336
  • Photon336
2KClO3 ---> 2KCL + 3O2 this is a decomposition reaction general formula: A----> B + C CaO + HOH ----> Ca(OH)2 this isn't double replacement either.
anonymous
  • anonymous
so d would be the answer?
anonymous
  • anonymous
@Photon336
Photon336
  • Photon336
K2S + CoCl2 ---> 2KCl + CoS that's your double replacement reaction. Potassium K reacts with Cl and Co reacts with sulfur. Follows the formula I showed you earlier.
Photon336
  • Photon336
Can you see why it's a?
anonymous
  • anonymous
yes
vera_ewing
  • vera_ewing
@Photon336 Can you please help me with my question?

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