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Molodets [167]
3 years ago
13

What will happen if a peeled banana is put on a hotplate? Will it undergo a physical or a chemical change?

Chemistry
1 answer:
FinnZ [79.3K]3 years ago
6 0
I would say physical, because a physical change is affecting the form of a chemical substance, but not it's chemical makeup.
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If 23.7 g of Al(OH)3(s) are mixed with 29.5 g of H2SO4(s) and the reaction is run, answer the following questions:
expeople1 [14]

Aluminum hydroxide \text{Al}(\text{OH})_3 can behave as a base and neutralize sulfuric acid \text{H}_2\text{SO}_4 as in the following equation:

2\;\text{Al}(\text{OH})_3 \; (s) + 3\; \text{H}_2\text{SO}_4 \; (aq) \to \text{Al}_2(\text{SO}_4)_3 \; (aq) + 6 \; \text{H}_2\text{O} \; (l) (Balanced)


(a)

n = m/M. Thus the ratio between the number of moles of the two reactants available:

n(\text{Al}(\text{OH})_3, \text{supplied}) / n(\text{H}_2\text{SO}_4, \text{supplied})\\= [m(\text{Al}(\text{OH})_3)/ M(\text{Al}(\text{OH})_3)] / [n(\text{H}_2\text{SO}_4) / M(\text{H}_2\text{SO}_4)]\\= [23.7 / (26.98 + 3 \times(16.00 + 1.008))]/[29.5 / (2 \times 1.008 + 32.07 + 4 \times 16.00)]\\\approx 1.01

The value of this ratio required to lead to a complete reaction is derived from coefficients found in the balanced equation:

n(\text{Al}(\text{OH})_3, \text{theoretical}) / n(\text{H}_2\text{SO}_4, \text{theoretical}) = 2/3 \approx 0.667

The ratio for the complete reaction is smaller than that of the reactants available, indicating that the species represented on the numerator, \text{Al}(\text{OH})_3, is in excess while the one on the denominator, \text{H}_2\text{SO}_4, serves as the limiting reagent.


(b)

The quantity of water produced is dependent on the amount of limiting reactants available. 29.5 / (2 \times 1.008 + 32.07 + 4 \times 16.00) = 0.301 \; \text{mol} of sulfuric acid is supplied in this reaction as the limiting reagent. 6 moles of water molecules are produced for every 3 moles of sulfuric acid consumed. The reaction would thus give rise to 0.301 \; \text{mol} \times 6/3 = 0.602 \; \text{mol} of water molecules, which have a mass of 0.602 \times (2 \times 1.008 + 16.00) = 10.8 \; \text{g}.


(c)

\text{Percentage Yield}\\= \text{Actual Yield} / \text{Theoretical Yield} \times 100 \; \%\\= 2.21 / 10.8 \times 100 \; \%\\= 20.4 \; \%


(d)

The quantity of \text{Al}(\text{OH})_3, the reactant in excess, is dependent on the number of moles of this species consumed in the reaction and thus the quantity of the limiting reagent available. The consumption of every 3 moles of sulfuric acid, the limiting reagent, removes 2 moles of aluminum hydroxide \text{Al}(\text{OH})_3 from the solution. 0.301 \; \text{mol} of sulfuric acid is initially available as previously stated such that 0.301 \; \text{mol} \times 2/3 = 0.201 \; \text{mol}, or 0.201 \times (26.98 + 3 \time (16.00 + 1.008)) = 15.7 \; \text{g}, of \text{Al}(\text{OH})_3 would be eventually consumed.

23.7 - 15.7 = 8.0 \; \text{g} of \text{Al}(\text{OH})_3 would thus be in excess by the end of the reaction process.

3 0
3 years ago
1. Which liquid sample is a pure substance?
IRISSAK [1]

The whole Activity , poem and paragraph is missing in the question.

Answer:

(1) Liquid A

(2) Solid A

Explanation:

Using this part of the given poem

Substances and mixtures behave differently,

During boiling and melting most especially

Boiling point of substance is fixed while mixture is not

Substance melts completely but mixture does not

The boiling point of the Pure substance remain fixed after reaching its boiling point this is shown by Liquid A

Solid A is melting completely so Solid A is a pure substance.

6 0
3 years ago
How does the state of atoms in a neon light change when light is emitted?
Blababa [14]
The state of atoms in a neon light when light is emitted is loss of energy.
5 0
3 years ago
Read 2 more answers
What are the general properties of the elements in the first two groups on the right side of the modern periodic table?
telo118 [61]
They have free electron(s) on their outermost energy levels making them good conductors.
They have metallic bonds in their chemical structure.
They readily lose the electrons on their outermost energy levels, to bond with non-metals in ionic bonds to form chemical compounds called "salts"
7 0
3 years ago
Iron oxide reacts with aluminum to give aluminum oxide and iron. What kind of chemical reaction is this?
Dima020 [189]
FeO + Al -> AlO + Fe 

As you can see, this type of reaction would lead to be a Single Placement (or Replacement) reaction!

Hope this helps! Best wishes!
3 0
3 years ago
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