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3 years ago

Are plant cells affected when water is scarce

1 answer:

5 0

Water is vital to the existence of plant life. Not only do plants use it to keep their cells from drying out, but they need water to move nutrients and raw materials throughout their systems to areas where photosynthesis and seed production take place. When water stress occurs, whether caused by drought or root impairment, many invisible processes are affected.

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Standard heats of formation for reactants and products in the reaction below are provided. 2 HA(aq) + MX2(aq) → MA2(aq) + 2 HX(l

Ira Lisetskai [31]

Answer : The standard enthalpy of reaction is, -318.618 kJ

Explanation :

Enthalpy change : It is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. It is represented as $\Delta H^o$

The equation used to calculate enthalpy change is of a reaction is:

$\Delta H^o_{rxn}=\sum [n\times \Delta H^o_f(product)]-\sum [n\times \Delta H^o_f(reactant)]$

The equilibrium reaction follows:

$2HA(aq)+MX_2(aq)\rightleftharpoons MA_2(aq)+2HX(l)$

The equation for the enthalpy change of the above reaction is:

$\Delta H^o_{rxn}=[(n_{(MA_2)}\times \Delta H^o_f_{(MA_2)})+(n_{(HX)}\times \Delta H^o_f_{(HX)})]-[(n_{(HA)}\times \Delta H^o_f_{(HA)})+(n_{(MX_2)}\times \Delta H^o_f_{(MX_2)})]$

We are given:

$\Delta H^o_f_{(HA(aq))}=-357.05kJ/mol\\\Delta H^o_f_{(MX_2(aq))}=69.602kJ/mol\\\Delta H^o_f_{(MA_2(aq))}=-63.958kJ/mol\\\Delta H^o_f_{(HX(l))}=-449.579kJ/mol$

Putting values in above equation, we get:

$\Delta H^o_{rxn}=[(1\times -63.958)+(2\times -449.579)]-[(2\times -357.05)+(1\times 69.602)]=-318.618kJ$

Thus, the standard enthalpy of reaction is, -318.618 kJ

6 0

3 years ago

What type of chemical reaction is this CHA + 0,CO, + H2O

likoan [24]

Combustion reaction

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3 years ago

hi friends my brain is mentally challenged so therefore i need someone to help with my science hw bc it’s 4 in the morning and i

Viefleur [7K]

Answer:

12. 2 protons and 2 neutrons

13. decreased by 2

14. Energy

15. None

16. I believe is also none

17. None

Sorry but its about 3: 52 am and a bit sleepy.

Hope these are good answers for you!

Explanation:

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The SI unit of time is the second, which is defined as 9,192,631,770 cycles of radiation associated with a certain emission proc

Vanyuwa [196]

To calculate the wavelength of this radiation if the SI unit of time is the second, which is defined as 9,192,631,770 cycles of radiation associated with a certain emission process in the cesium atom, the wavelength is one cycle of radiation, and therefore the wavelength is 1/9192631770

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An animal is an example of a/an- A: tissue B:cell type C:organ D:organism

kvv77 [185]

Answer:

Explanation:

organism

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