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Genrish500 [490]
3 years ago
13

Magnesium hydroxide is slightly soluble in water (Ksp = 1.8 x 10-11). NaOH is added to a solution of Mg(NO3)2 until a precipitat

e forms and persists. The solution is then heated and the precipitate dissolves. What can you conclude from these observations?
A. dissolution of Mg(NO3)2 is endothermic
B.dissolution of Mg(NO3)2 is exothermic
C. dissolution of Mg(OH)2 is endothermic
D. dissolution of Mg(OH)2 is exothermic
Engineering
1 answer:
Anastaziya [24]3 years ago
8 0

Answer:

Explanation:

When NaOH is added to a solution of Mg(NO3)2 , a precipitate forms which will be Mg(OH)2 . When temperature of the solution is raised , Mg(OH)2 gets dissolved.

According to Le Chatelier principle , reaction tends to proceed towards the balance point when , the effect of external change in temperature or pressure etc is reduced.

Addition of heat , promotes dissolution. It is possible only when  the process of dissolution is endothermic. Additional dissolution on heating helps in reducing the temperature because , process of dissolution is endothermic.

Dissolution of Mg(OH)₂ is endothermic.

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Answer:

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Explanation:

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A growing trend in urban design is the concept of a rooftop garden. If every building in a city were to install a rooftop garden
vlabodo [156]

Answer:The Urban heat island temperature will be REDUCED.

Two Impacts of Rooftop gardens

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Explanation: Rooftop gardens are gardens made on top of the roofs of buildings, it is a Green initiative aimed at helping to improve the overall Environment.

Rooftop gardens have several significant benefits which includes

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5 0
3 years ago
A house is losing heat at a rate of 1700 kJ/h per °C temperature difference between the indoor and the outdoor temperatures. Exp
Furkat [3]

Answer:

1700kJ/h.K

944.4kJ/h.R

944.4kJ/h.°F

Explanation:

Conversions for different temperature units are below:

1K = 1°C + 273K

1R = T(K) * 1.8

= (1°C + 273) * 1.8

1°F = (1°C * 1.8) + 32

Q/delta T = 1700kJ/h.°C

T (K) = 1700kJ/h.°C

= 1700kJ/K

T (R) = 1700kJ/h.°C

= 1700kJ/h.°C * 1°C/1.8R

= 944.4kJ/h.R

T (°F) = 1700kJ/h.°C

= 1700kJ/h.°C * 1°C/1.8°F

= 944.4kJ/h.°F

Note that arithmetic operations like subtraction and addition of values do not change or affect the value of a change in temperature (delta T) hence, the arithmetic operations are not reflected in the conversion. Illustration: 5°C - 3°C

= 2°C

(273+5) - (273+3)

= 2 K

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AveGali [126]

The current IDS is greater than 0 since the VGS has induced an inversion layer and the transistor is operating in the saturation region.

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