54.868% because well la la la (sorry had to be 20 characters)
Answer:
6+9=15
mass number =15
mass number = no. protons + no. of neutrons
Answer: The temperature is there to confuse you on purpose. Density changes with temp, but in these type of problems, they mean nothing
Explanation:
The formula for density is mass per unit of volume.
We dont have to do any conversions here so it boils down to division and multiplication.
Now for the second part:
Answer:
No effect will be observed since C is not included in the equilibrium expression.
Explanation:
Let's consider the following reaction.
CO₂(g) + C(graphite) ↔ 2 CO(g)
The equilibrium constant (Kc) is the product of the concentration of the products raised to their stoichiometric coefficients divided by the product of the concentration of the reactants raised to their stoichiometric coefficients.
Kc only includes gases and aqueous species (not liquids or solids).
![Kc=\frac{[CO]^{2}}{[CO_{2}]}](https://tex.z-dn.net/?f=Kc%3D%5Cfrac%7B%5BCO%5D%5E%7B2%7D%7D%7B%5BCO_%7B2%7D%5D%7D)
As we can see, C is a solid and is not included in the equilibrium expression, so adding some C would have no effect on it.
Answer:
Explanation:
An independent variable is a variable in which does not rely on how other variables. It is usually cause in an experiment. From Sara Lilia experiment, we can identify the different music genres as her independent variable.
The dependent variable here is her ability to concentrate in her study. Here, we should know that the dependent variable is often the result of the effects of the independent variable.
There is no control in the experiment. In the controlled set up, we would have put all other know factors that would make concentrations easier into consideration. It could be the environment, the arrangement of the room and a particular time of the day. None of such was stated in the experiment.
The constant variable is the variable that was held fixed throughout the experimental procedure. Here the time of study was fixed at 5minutes. What would happen to concentration if this time was shorter or much more?
