CHEMISTRY HIGH SCHOOL

When wood is burned, energy is released in the forms of heat and light. Describe the reaction, and explain why this change does not violate the law of conservation of energy. Use the terms combustion, exothermic, and chemical energy.

Answers

Answer 1

Answer:

Burning wood would be a sort of combustion (spontaneous), which is a biochemical process that occurs involving chemical energies.

It's indeed exothermic, which means it generates heat because it happens. Whenever the hardwood is burnt, charcoal decomposes and then becomes responsible for the formation and creates a new particle.
Because the carbons aren't generated but just redistributed or shuffled, this doesn't contradict the principle or the concept of conserving energy.

Thus the above approach is appropriate.

Learn more about combustion here:

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Answer 2

Answer: Burning wood is a form of spontaneous combustion, a type of chemical reaction occurring with chemical energy. It is exothermic, meaning it releases heat when it occurs.When wood is burned, carbon breaks down (which creates the crackling sound you hear) and creates a new material. Since the carbons are not being created and only rearranged, this does not violate the law of conservation of energy.

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Which of these laboratory techniques is best to separate from a liquid to recover the liquid

Answers

It depends on what you are separating from the liquid. If it is a solid you can just filter it or put it in a centrifuge. If it is a dissolved solvent you might need to use something like chromatography. I am not very sure though. I hope this helps. Let me know if anything is unclear.

The volume of 6.00M HCl needed to make 319 ml of 6.80M HCl

Answers

Answer : The volume of 6.00 M HCl needed are, 361.5 ml

Solution :

According to the neutralization law,

$M_1V_1=M_2V_2$

where,

$M_1$ = molarity of HCl solution = 6.00 M

$V_1$ = volume of HCl solution = ?

$M_2$ = molarity of another HCl solution = 6.80 M

$V_2$ = volume of another HCl solution = 319 ml

Now put all the given values in the above law, we get the volume of HCl solution.

$(6.00M)* V_1=(6.80M)* (319ml)$

$V_1=361.5ml$

Therefore, the volume of 6.00 M HCl needed are, 361.5 ml

The mole number of the solute after dilution is constant. So the mole number of 319 ml of 6.80 M HCl is 6.80*319*10^(-3)=2.17 mol. So the volume of 6.00 M HCl needed is 2.17/6.00=0.362 L=362 ml.

Which value from his calculation most strongly affects the number of significant figures in the answer?

Answers

well, the value that would most affect it is the one with the least sig figs

that would be the one that had the least precise way of measurement

When are ionic bonds formed?

Answers

The Ionic bond occurs with formation of ions, which are by electrostatic attraction. Occurs between metal, which has a tendency to lose electrons, and a non-metal, which tends to receive electrons. An example of this type of link is sodium chloride (NaCl)

Na⁺ and Cl⁻

hope this helps!

The empirical formula for a compound is CH2. If n is a whole number, which shows a correct relationship between the molecular formula and the empirical formula? a) empirical formula mass / molecular mass = n B) molecular mass = element mass / empirical formula mass ´ 100 c) subscript of H in empirical formula = 2 subscript of H in molecular formula D) subscript of C in molecular formula = n subscript of C in empirical formula

Answers

An empirical formula is the "reduced" version of a molecular formula. For example, CH3 is the empirical formula for C2H6, C3H9, C4H12, and so forth. The difference in subscripts between an empirical formula and molecular formula is given by the constant n. If n is a whole number, this means the numerator is the molecular formula. So the answer is D. subscript of C in molecular formula = n subscript of C in empirical formula. This can be rewritten as:

n = subscript of C in molecular formula/subscript of C in empirical formula

Answer:

Explanation:

Find a mole of 0.0960 g of H2SO4

Answers

Molar mass H₂SO₄ = 98.079 g/mol

1 mol -------- 98.079 g
? mole ------ 0.0960 g

moles = 0.0960 * 1 / 98.079

= 0.0960 / 98.079

= 9.788 x 10⁻⁴ moles

hope this helps!

Final answer:

The number of moles of 0.0960 grams of H2SO4 can be calculated using the formula: mole = mass / molecular weight. Given that the molecular weight of H2SO4 is 98.08 g/mol, we find that 0.0960 grams of H2SO4 is approximately 0.000978 moles.

Explanation:

The question is asking us to find a mole of 0.0960 g of H2SO4. In order to solve it, we need to know the molecular weight of H2SO4 (Sulfuric acid), which is approximately 98.08 g/mol.

This means that 1 mole of H2SO4 has a mass of 98.08 grams. We would now like to find out how many moles correspond to 0.0960 grams.

We use the equation: mole = mass / molecular weight, thus: mole = 0.0960 g / 98.08 g/mol = 0.000978 moles.

Therefore, 0.0960 grams of H2SO4 corresponds to approximately 0.000978 moles.

Learn more about Mole Calculation here:

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