Acake is made by mixing ingredients and placing the material in an oven for baking. what type of reaction is involved?

select an answer

exothermic


caloric


joule


endothermic

an inert electrode is made up of non reactive metals like platinum

an inert is electrode is required in one of the half cells or both the cells if there is no solid conducting metal in either half reaction. or we can say that if in any half reaction neither product nor reactant is in solid phase.

from the given equations it is clear that

a) in first cell we have cu and ag in solid phase in either side

b) in second reaction the iron is in aqueous phase on both the side of reactant and product

so for reduction of iron or in cathodic half cell we need inert electrode [which does not participate in reaction]

hence answer is

c) in third reaction zn and sn are in solid phase in either side

d) in fourth reaction al and ni are in solid phase in either side

we can relate the hydroelectric power with sun one the basis of hydrologic cycle.

the solar energy obtained from sun heats up water on earth (oceans) and evaporates it. this water condense into clouds. the clouds precipitate out water in the form of rain or snow. this snow remains on mountains and thus solar energy is responsible for the potential energy of water on mountains which is then converted to kinetic energy and this is used as hydroelectric power.

the water present on mountains in rivers or as snow reach back to oceans and this is how the cycle completes known as hdrologic cycle.

answer:

a) 21.

explanation:

a mole consists of 6.022 x 10²³ units, these units could be atoms making up an element or molecules making up a compound.

nitrogen gas is a compound - n₂ gas and its made of n₂ gas molecules.

1 mol of n₂ is made of 6.022 x 10²³ nitrogen molecules.

the sample contains 6.0 x 10²⁴ atoms of n, however nitrogen gas is made of n₂ molecules, 2 n atoms make up one nitrogen gas molecule. therefore the number of nitrogen molecules are half the number of n atoms in the sample

number of nitrogen molecules - n₂ - 6.0 x 10²⁴ / 2 = 3.0 x 10²⁴ n₂ molecules

6.022 x 10²³ molecules of n₂ make up 1 mol

then 3.0 x 10²⁴ molecules of n₂ make up -( 1 / 6.022 x 10²³ ) x 3.0 x 10²⁴

number of n₂ moles - 5.0 mol

there are 5.0 moles of n₂ in the sample