Answer:
0.0697 moles
Explanation:
We are being asked 4.2 x 10^22 atoms of aluminium to moles the following should be used for conversion.
Fraction of 1 mole Al over six point zero two two times ten to twenty third power atom Al.
that is 1 mole = 6.022 x10^23 atom
? = 4.2 x 10^22 atom
by cross multiplication
(1 mole x 4.2 x 10^22)/ 6.022 x 10^23 = 0.0697 moles
Actually, I strongly believe it is a switch.
Answer:
1,69 x10²⁴
Explanation:
Answered it in the comments! ^^
Answer:
Las siguientes son reacciones químicas;
combustión de leña
oxidación del hierro
descomposición del agua en hidrógeno y oxígeno
Explanation:
Una reacción química da como resultado la formación de una (s) sustancia (s) nueva (s), mientras que un cambio físico no conduce a la formación de una sustancia nueva.
Las siguientes son reacciones químicas;
combustión de leña: la combustión de madera implica la oxidación del carbono según la reacción; C (s) + O2 (g) -------> CO2 (g)
oxidación del hierro: La oxidación del hierro conduce a la formación de óxidos de hierro. Como; 2Fe (s) + O2 (g) ----> 2FeO (s)
descomposición del agua en hidrógeno y oxígeno: esta es una reacción química en la que el agua se descompone de la siguiente manera; 2H2O (l) -----> 2H2 (g) + O2 (g)
Todos estos procesos enumerados anteriormente conducen a la formación de nuevas sustancias, por lo tanto, son reacciones químicas.
Convection currents in air
Explanation:
The convection currents in air tends to blow out winds towards the water at night.
Convection is a mode of heat transfer commonly found in fluids.
It involves the movement of the particles due to differences in temperature and density of the air.
- The land and water heats at different rate.
- The land absorbs and loses heat quickly because it is a good conductor of heat.
- At night, the shore area is cold.
- The air around is very dense and close to the surface.
- This air mass moves towards the surface of the ocean.
- The ocean has high specific heat capacity and takes a long time to heat and cool.
- At night, as it is loosing heat, the air around warms up and rises shifting land ward.
- This movement of cold and dense air from land and the attendant movement of warm air to the land sets up convection currents in the air.
learn more:
Heat transfer in the sun brainly.com/question/1140127
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