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3 years ago

A substance that can be separated into two or more substances only by a chemical change is

1 answer:

5 0

A substance that can be separated into two or more substances only by a chemical change is known as a heterogeneous mixture

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Arrange the following alkyl halides in order from most reactive to least reactive in an SN1 reaction: 2-bromo-2-methylpentane, 2

inn [45]

Answer:

2-iodo-2-methylpentane > 2-bromo-2-methylpentane > 2-chloro-2-metylpentane > 3-chloropentane.

Explanation:

At a substitution reaction by SN1, the alkyl halide must lose its halide, and then an intermediary will be formed: a carbonium, which is an alkyl group with a positive charge in the carbon. The halide lost will be formed the halide ion, which is also an intermediary of the reaction.

The reactivity depends on the stability of the intermediaries (first of the carbonium, and second of the halide ion). As more bonded with carbons is the carbonium, more stable it is. The order of stability of the halides ions is from their electronegativity: as lower is it, as stable is the ion. The order is then: I⁻ > Br⁻ > Cl⁻ > F⁻.

2-bromo-2-methylpentane, 2-chloro-2-metylpentane, and 2-iodo-2-methylpentane, will form a 3-degree intermediary, so they will be more reactive than 3-chloropentane, which form a 2-degree intermediary. So, for the order of the stability of the halide ions, the order of reactivity is:

2-iodo-2-methylpentane > 2-bromo-2-methylpentane > 2-chloro-2-metylpentane > 3-chloropentane.

4 0

3 years ago

Solid magnesium (Mg) is easier to cut than solid potassium (K). true or false?:

coldgirl [10]

False. All Group 1 metals are soft and easily cut with a knife. Magnesium is under Group 2 and it is a hard and strong metal. Hence, it is false.

6 0

2 years ago

Read 2 more answers

Nicotine, a component of tobacco, is composed of C, H, and N. A 5.250-mg sample of nicotine was combusted, producing 14.242 mg o

aev [14]

n - number of mole

M(CO2) = 12.0 +16.0*2 = 44.0 mg/mmol

M(H2O) = 2*1.0 +16.0= 18.0 mg/mmol

1) 14.242 mg of CO2*1 mmol/44.0g =0.32368 mmol CO2

0.32368 mmol CO2 has 0.32368 mmol C

2) 0.32368 mmol C*12 mg/1 mmol= 3.88418 mg C

3) 4.083 mg of H2O * 1 mmol/18 mg = 0.226833 mmol H2O

0.226833 mmol H2O has 2*0.226833 mmol H = 0.453666 mmol H

4) 0.453666 mmol H*1 mg/1mmol = 0.453666 mg H

5) Mass of N = 5.250 mg - 3.88418 mg (C) - 0.453666 mg (H)≈ 0.912 mg N

0.912 mg N * 1 mmol/14.0 mg = 0.0652 mmol N

6) n(C) : n(H) : n(N) = 0.32368 mmol C : 0.453666 mmol H : 0.0652 mmol N

0.0652 mmol N is a smallest value.

n(C) : n(H) : n(N) = (0.32368 mmol/0.0652 mmol) C : (0.453666 mmol H/0.0652 mmol) : (0.0652mmol/0.0652 mmol)N = 5 : 7 : 1

n(C) : n(H) : n(N) = 5 : 7 : 1

Empirical formula : C5H7N.

8 0

3 years ago

How many grams of magnesium oxide can be produced when 125 g Mg react with 102 g O2?

4vir4ik [10]

Balanced Equation: 2Mg + O2 ➡️ 2MgO
125 x 2= 250 102 x 2= 204
250 + 204= 454
So the answer should be 454 grams of magnesium oxide should be produced.

4 0

3 years ago

Which of the following conditions characterizes a system in a state of chemical equilibrium?

vodomira [7]

Answer:

a) Reactants are being consumed at the same rate they are being produced.

Explanation:

In a chemical reaction, chemical equilibrium is a state in which there is no change in concentration of the reactant and product. This means that as the reactants are consumed, they are also produced. Same thing with the products; immediately they are formed, they are consumed.

The option that accurately depicts a reaction at equilibrium is;

a) Reactants are being consumed at the same rate they are being produced.

7 0

3 years ago