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3 years ago

Give maximum 3 examples each for exothermic and endothermic reaction.

Chemistry

1 answer:

diamong [38]3 years ago

3 0

Explanation:

Exothermic reactions are those reactions in which heat is released.

Reactants→products+heat

For example, formation of ammonia from nitrogen and hydrogen is an exothermic reaction.

N2(g)+3H2(g)→2NH3(g)+92.2kJ

Endothermic reactions are those reactions in which heat is absorbed.

Reactants+heat→products

For example, dissociation of ammonia into nitrogen and hydrogen is an endothermic reaction.

2NH3 (g)+92.2kJ→

N2(g)+3H2(g)

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An aqueous solution 10 g of an optically pure substance diluted to 500ml with water and placed in a polarimeter tube 20 cm long.

Gennadij [26K]

Explanation:

Formula to calculate specific rotation is as follows.

Specific rotation ( $[\alpha]$ ) = $\frac{\alpha}{c} \times l$

where, $\alpha$ = observed rotation

c = concentration in g/ml

l = path length in dm

It is given that,

$\alpha = -6.16^{o}$

c = $\frac{10 g}{500 ml}$ = 0.02 g/ml

l = 20 cm = 2 dm (as 1 dm = 10 cm)

Therefore, calculate the specific rotation as follows.

Specific rotation ( $[\alpha]$ ) = $\frac{\alpha}{c} \times l$

= $\frac{-6.16^{o}}{0.02 g/ml} \times 2 dm$

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3 years ago

The movement of molecules across a membrane from an area of high concentration to one of low concentration is best described as:

mestny [16]

Answer:

Difussion

Explanation:

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This movement of particles will be modified according to the length or area of the pipe and the concentration of solute. The greater the difference in solute concentration along the tube, the greater the diffusion

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3 years ago

Give endothermic examples

RUDIKE [14]

Answer:

Melting ice cubes.

Melting solid salts.

Evaporating liquid water.

Explanation:

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3 years ago