Answer:
The air pressure on the inner side of the can balances that on the outside of the can.
Explanation:
Indeed the air pressure might crush a properly-sealed air-tight can during the descent. The reason is that the air pressure on the outside of the can exceeds that on the inside. The force that pushes the wall inwards exceeds the force that pushes the wall outwards. It's the pressure difference that crushes the can. However, that's not exactly the case for the "empty soft-drink can" here.
The question states that the can is already "empty." Therefore, it is quite reasonable to assume that the can was already opened. In other words, the can would no longer be air-tight. Air particles could freely enter and leave the can. As a result, when the can is brought down a mountain, air enters the can. As long as the can stays open, there would be enough air particles on the inside to balances the pressure. A pressure difference will not build up. That ensures that the can stays intact.
Answer:
b) +2 and +3.
Explanation:
Hello,
In this case, given the molecular formulas:
And:
We can relate the subscripts with the oxidation states by knowing that they are crossed when the compound is formed, for that reason, we notice that oxygen oxidation state should be -2 for both cases and the oxidation state of X in the first formula must be +2 since both X and O has one as their subscript as they were simplified:
Moreover, for the second case the oxidation state of X should be +3 in order to obtain 3 as the subscript of oxygen:
Thus, answer is b)+2 and +3
Best regards.
Answer: g
Explanation:
0.92g/mL • 237mL/1cup - the mL cancel out leaving just grams
Answer: B.) 0.827
Explanation:
Given the following :
Equilibrium constant (k) = 0.75
Forward rate constant = 0.62 mol/L/s
Backward rate constant =?
The equilibrium constant denited as 'k' is the proportion of the forward rate constant and the reverse rate constant.
Mathematically,
K = [forward rate constant / Reverse rate constant]
k = 0.75 ; forward rate constant = 0. 62mol/L/s
0.75 = [ 0.62mol/L/s ÷ reverse rate constant]
Reverse rate constant * 0.75 = 0.62mol/L/s
Reverse rate constant = (0.62mol/L/s ÷ 0.75)
Reverse rate constant = 0.8266mol/L/s
Reverse rate constant = 0.827mol / L/s
Answer:
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced chemical equation for combustion of propane will be :