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Virty [35]
3 years ago
12

a boy on a skateboard is pushed down the sidewalk by a friend. The skateboard rolls for a while but eventuallycomestoasto. Whatf

orceiscausingtheskateboardtostoprolling?
Chemistry
2 answers:
Mariulka [41]3 years ago
7 0
The Cause Of The Stop to The Skateboard's Rolling Is Friction.
azamat3 years ago
4 0
Friction between the sidewalk and the wheels of the skateboard

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Se hace reaccionar 4,00 g de aluminio y 42,00 g de bromo, según la reacción: Al(s)+Br2(l)⟶AlBr3(s) Calcular las moles de AlBr3(s
NeX [460]

Answer:

0.145 moles de AlBr3.

Explanation:

¡Hola!

En este caso, al considerar la reacción química dada:

Al(s)+Br2(l)⟶AlBr3(s)

Es claro que primero debemos balancearla como se muestra a continuación:

2Al(s)+3Br2(l)⟶2AlBr3(s)

Así, calculamos las moles del producto AlBr3 por medio de las masas de ambos reactivos, con el fin de decidir el resultado correcto:

n_{AlBr_3}^{por\ Al}=4.00gAl*\frac{1molAl}{27gAl} *\frac{2molAlBr_3}{2molAl}=0.145mol AlBr_3\\\\n_{AlBr_3}^{por\ Br_2}=42.00gr*\frac{1molr}{160g Br_2} *\frac{2molAlBr_3}{3molBr_2}=0.175mol AlBr_3

Así, inferimos que el valor correcto es 0.145 moles de AlBr3, dado que viene del reactivo límite que es el aluminio.

¡Saludos!

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2 years ago
A sample taken from a layer of mica in a canyon has 2.10 grams of potassium-40. A test reveals it to be 2.6 billion years old. H
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there are three fundamental particles of atom

which are :

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Particle Symbol

electron =》e-

proton =》p+

neutron =》n°

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