Answer:
the heat given off is 75 J.
Explanation:
Given;
latent heat of fusion of lead, L= 25 J/g
mass of liquid lead, m = 3.0g
The heat given off is calculated as;
H = Lm
Where;
H is the quantity of heat given off
H = 25 x 3
H = 75 J.
Therefore, the heat given off is 75 J.
Answer: The concentration of hydroxide ions at this temperature is ![7.16\times 10^{-7}](https://tex.z-dn.net/?f=7.16%5Ctimes%2010%5E%7B-7%7D)
Explanation:
When an expression is formed by taking the product of concentration of ions raised to the power of their stoichiometric coefficients in the solution of a salt is known as ionic product.
The ionic product for water is written as:
![K_w=[H^+][OH^-]](https://tex.z-dn.net/?f=K_w%3D%5BH%5E%2B%5D%5BOH%5E-%5D)
![5.13\times 10^{-13}=[H^+][OH^-]](https://tex.z-dn.net/?f=5.13%5Ctimes%2010%5E%7B-13%7D%3D%5BH%5E%2B%5D%5BOH%5E-%5D)
As ![[H^+]=[OH^-]](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%3D%5BOH%5E-%5D)
![5.13\times 10^{-13}=x^2](https://tex.z-dn.net/?f=5.13%5Ctimes%2010%5E%7B-13%7D%3Dx%5E2)
![x=7.16\times 10^{-7}](https://tex.z-dn.net/?f=x%3D7.16%5Ctimes%2010%5E%7B-7%7D)
The concentration of hydroxide ions at this temperature is ![7.16\times 10^{-7}](https://tex.z-dn.net/?f=7.16%5Ctimes%2010%5E%7B-7%7D)
Answer:
The correct answer is D Vaporizing a substance.
Probably its atomic number (proton number), because this is how they are arranged already.
Other factors are their form (metal/non-metal) etc., which determines how they react with each other and bond.
Another important factor is the number of electrons in their valent (outer) shell. This is because it tells use how the atom will react/bond with other atoms, how 'violent' that reaction will be, and whether it will bond at all (eg. nobel gases)
Line one: 4h atoms and 2o atoms on reactant and product side.
Line two: 4fe atoms 6o atoms on reactant and product side.
Line three: 2cl atoms, 2na atoms and 2br atoms on both the reactant and product side.