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3 years ago

Methods used to separate heterogeneous mixtures include the following: check all that apply. *

Chemistry

1 answer:

RUDIKE [14]3 years ago

3 0

Answer:

Filtration, Sifting and Decanting

Explanation:

Heterogenous mixtures can be seperated by filtration and sifting (Also known as sieving). Sifting is the process of parting a mixture using a sieve. Sifting is used to separate solid mixtures that contain molecules of varying sizes. Filtration is the process of separating a liquid from an insoluble solid. A common example is using a funnel and a coffee filiter to seperate the liquide from the insoluable solid. Although there are many other methods for filtration. You can also separate mixtures by decantation. Decantation is the process of separating a liquid from a solid/liquid by removing the liquid layer at the top from the layer of solid/liquid below.

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Explain how humans get muscle cramps

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Answer:

because of accumulation of lactic acid due to anaerobic respiration

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2 years ago

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t-Butyl alcohol (TBA) is an important octane enhancer that is used to replace lead additives in gasoline [Ind. Eng. Chem. Res.,

Andrew [12]

Complete Question:

t-Butyl alcohol (TBA) is an important octane enhancer that is used to replace lead additives in gasoline [Ind. Eng. Chem. Res., 27, 2224 (1988)]. TBA was produced by the liquid-phase hydration (W) of isobutene (I) over an Amberlyst-15 catalyst. The system is normally a multiphase mixture of hydrocarbon, water, and solid catalysts. However, the use of cosolvents or excess TBA can achieve reasonable miscibility. The reaction mechanism is believed to be

I + S ⇄ I*S

W + S ⇄ W*S

W*S + I*S ⇄ TBA * S * S

TBA * S ⇄ TBA + S

Derive a rate law assuming:

(a) The surface reaction is rate limiting

(b) The adsorption of isobutene is limiting

(c) The reaction follows Eley-rideal Kinetics

I*S+W ⇄ TBA * S

and surface reaction is limiting

(d) Isobutene (I) and water (W) are adsorbed on different sites

I + S₁ ⇄ I*S₁

W + S₂ ⇄ W*S₂

TBA is not on the surface, and the surface reaction is rate-limiting

$[Ans: r'_{TBA}=-r'_1=\frac{k[C_1C_w-C_{TBA/K_C}]}{(1+K_WC_W)(1+K_1C_1)} ]$

(e) What generalizations can you make by comparing rate laws derived from part (a) through (d)?

Answer and explanation:

The mechanism for the production of t-butyl alcohol is as follows:

the reaction and rate law for the adsorption of isobutene over the amberlyst-15 is as follows:

I + S ⇄ I * S $-r_{ADI} = k_I(C_1C_v-\frac{C_{I.S}}{K_I} )$

where $C_V$ is the concentration of vacant site

$K_I$ is the equilibrium constant of the adsorption

$k_I$ is the rate constant for forward

$C_I,C_{I.S}$ are concentration of isobutene and site filled with isobutene

The reaction and rate law for the adsorption of water (W) over the amberlyst-15 catalyst catalyst is as follows

W + S ⇄ W.S $-r_{ADW} = k_W(C_WC_V-\frac{C_{W.S}}{K_W} )$

The reaction and rate law for the surface reaction on the catalyst is as follows

W.S + I.S ⇄ TBA . S + Sn $-r_s = k_s(C_{W.S}C_{I.S}-\frac{C_{TBA.S}C_V}{K_s} )$

The reaction and rate law for the desorption of TBA from catalyst is as follows

TBA . S ⇄ TBA + S $-r_{D TBA} = k_{DTBA}(C_{TBA.S}-\frac{C_{TBA}C_V}{K_{DTBA}} )$

the attached image below gives the remaining steps

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3 years ago

A person's heartbeat is 89 beats per minute. If his/her heart beats 3.1e9 times in a lifetime, how long (in whole years) does th

andrezito [222]

I think the answer is 82.5

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3 years ago

Semimetals is a term which refers to what

zvonat [6]

Answer:

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3 years ago

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How many atoms of oxygen are present in the reactants<br> 6CO2+6H2O=C6H12O6+6O2

cricket20 [7]

Answer:

3.6132 * 10^24 atoms/molecules of 02

Explanation:

When we look at the balanced chemical equation, we can see that there are 6 moles of O2.

In order to convert from moles to formula units (atoms and molecules),

you need to multiply by avogadro's number.

6 moles * $6.022*10^{23}$ /1 mol = 3.6132 * 10^24 atoms/molecules of 02