12
down vote
favorite
3
Aluminium oxide is amphoteric. It is easy to see that it is a Bronsted-Lowry base through the following reaction:
Al2O3+6HCl →2AlCl3+3H2O
AlX2OX3+6HCl →2AlClX3+3HX2O
The Alumnium oxide splits and the oxygen accepts a proton, forming water.
But what about the reaction with a base? In my textbook, they say:
Al2O3+NaOH →2NaAlO2+H2O
AlX2OX3+NaOH →2NaAlOX2+HX2O
Now, the textbook claims that Aluminium oxide is an acid merely because it reacts with a base to form a salt and water, as is characteristic of a neutralization reaction.
But I'm not satisfied with this definition. I mean, acids aren't defined as 'things that neutralize bases', we have well-established definitions for them.
I tried to figure out for myself how this could be. Clearly, the Bronsted-Lowry theory cannot be applied here since the compound in question has no protons to donate. Therefore, the only alternative is the Lewis concept. I cannot see how that is applicable in this case.
The most basic definition of "acid" is that it is a proton donor (or one which accepts a lone pair)
All of this stuff is done in an aqueous medium, so we can assume that all aqueous ions and molecules are present. With this assumption (in this case, we are assuming that OH−OHX− is available to react), we get the following equation:
Al2O3+OH−⟶2AlO2−+H+
AlX2OX3+OHX−⟶2AlOX2X−+HX+
Similarly, we get:
Al2O3+6H+⟶2Al3++H2O
AlX2OX3+6HX+⟶2AlX3++HX2O
where it is acting like a proton acceptor (base).
Car B and E are speeding up, while car C is slowing down.
<h3>
What is Velocity ?</h3>
Velocity is the directional speed of a object in motion as an indication of its rate of change in position as observed from a particular frame of reference.
Step-by-step explanation :
Acceleration (a) is the rate of change of velocity with time.
It is calculated by dividing the change in velocity (Δv) with the time taken for the change to occur.
In this question , the time is 10 sec in all cases.
We can divide the velocity in km/h by 3.6 to convert to m/s
In Car A
Δv = 8.33-8.33 = 0m/s
t = 10s
a = 0 m/s² ⇒car is moving with same speed and in the same direction
Car B
Δv = 5.55-0 = 5.55
t = 10
a = 5.55 / 10 = 0.555 m/s² ⇒car is speeding up
Car C
Δv = 0 - 8.33 = -8.33 m/s
t = 10
a = - 8.33/10 = -0.833 m/s² ⇒car is slowing down
Car D
Δv = 0-0 = 0
t = 10s
a = 0/10 = 0 m/s² ⇒car is at rest
Car E
Δv = 8.33 - 5.55 = 2.78
t = 10
a = 2.78/10 = 0.278 m/s²⇒car is speeding up
Learn More about acceleration here ;
brainly.com/question/13154163
#SPJ1
Hello and good evening!
To burn... I believe it has to be 300 degrees celsius or 572 degrees Fahrenheit. What happens is it begins to release combustible gases that ignite when they contact an open flame. The gases burn, gradually raising the temperature of the wood.
I really hope this helps.
~Brooke❤️
Answer:
A. Inflation pressure of the tyres
Explanation:
In an experiment, the independent variable is the variable that the experimenter changes or manipulates in order to induce a response in another variable called Dependent variable.
In this case in which an experiment was conducted on how inflation pressure of tyre affects a vehicle's maximum speed. The tyres of three different vans were used. The tyre of the first van were set at normal pressure of 35psi, the other van tyres were set at 40psi (overinflated) and 30psi (underinflated) respectively. This means that the INFLATION PRESSURES OF THE TYRES were the variable being changed, hence, is the INDEPENDENT VARIABLE.
Answer:
Explanation:
Deforestation has an adverse affect on air by reducing the amount of oxygen and increasing the amount of carbon dioxide as well as contributing to global warming.