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noname [10]
3 years ago
7

What the answer cause I dont get it

Chemistry
2 answers:
ArbitrLikvidat [17]3 years ago
5 0
Hi,
the answer should be the last one, ‘neither accurate nor precise’.
The values are quite different from one another and not close to the actual value.

Hope this helps! If my answer was not clear enough or you’d like further explanation please let me know. Also, English is not my first language, so I’m sorry for any mistake.
Artemon [7]3 years ago
4 0

the answer is D that is the only one that makes sense. plz tell me if wrong

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Number 14? Please :)
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i believe the answer is because asphalt conducts heat better

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3 years ago
Complete the acid-base reaction between butyric acid HC4H7O2 and potassium hydroxide KOH.
Lilit [14]

An acid-base reaction or a neutralization reaction is a <u>chemical reaction that occurs between an acid and a base producing a salt and water</u>. The acids and bases can be strong or weak depending on their degree of ionization in water.

Butyric acid is a weak acid and in water it is ionized in the following way, loosing a proton (H+):

HC4H7O2 (aq) ⇆ H+ (aq) + C4H7O2- (aq)

On the other hand, potassium hydroxide is a strong base, so it will be completely ionized in water:

KOH(aq) → K+(aq) + OH-(aq)

Then the <u>net acid-base reaction</u> between butyric acid and KOH is:

HC4H7O2 (aq) + OH- (aq) ⇆ H2O + C4H7O2- (aq)

It is valid to consider only the OH- produced from the ionization of KOH in water since, as mentioned, this molecule is completely ionized. Also, we do not include the K + in the net equation since it is a spectator ion, it does not undergo chemical changes.

6 0
4 years ago
Evidence that best supports the theory of biological evolution was obtained from the
Alisiya [41]
The homologous structures and the analogous structures of different species.
6 0
3 years ago
Changes of state are a result of a change in the______of the matter.
jasenka [17]

Answer: -

Kinetic energy.

Explanation: -

Solids have the least kinetic energy and the highest intermolecular force of attraction among the three states of matter.

When heat energy is supplied to the solid, the kinetic energy of the solid particles increases. At some point, the kinetic energy becomes comparable to the intermolecular force of attraction. At that point solids change into liquids.

When further heat energy is given, at certain point the kinetic energy becomes far greater than the intermolecular forces of attraction. At that point it becomes gas.

4 0
4 years ago
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yuradex [85]

Answer:

12 liters of oxygen are released from the decomposition of the peroxide.

Explanation:

The hydrogen peroxide is decomposed by this reaction:

2 H₂O₂ (l) → 2 H₂O (l) + O₂ (g)

Molar mass H₂O₂ = 34 g/m

Moles of peroxide: 36.5 g / 34 g/m = 1.07 moles

Ratio is 2:1, so 2 moles of peroxide will be decomposed in 1 mol of oxygen (exactly the half)

1.07 moles of peroxide will be decomposed in the half of moles, 0.54 moles

Let's apply the Ideal Gases law Equation to solve the volume

1 atm . V = 0.54 mol . 0.082 .273K

V = (0.54 mol . 0.082 .273K) / 1 atm → 12L

8 0
3 years ago
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