An unknown substance has a density of 2.5g/ml. Is this a physical or chemical property? How do you know?
1 point
Density is a chemical property because every substance has a unique density that we
can use to identify it.
Density is a physical property because we can find it for a substance without
changing the identity of the substance.
O Density is a chemical property because all chemicals have a density.
O Density is a physical property because we can measure it.

more info ? ? i don't understand what the question is

explanation:

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

the answer for sodium is 0.186

the answer for rubidium is 0.251

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.