Answer:
B) Reactivity
Explanation:
Density, color, melting point, rigidity, fluidity, shape, size etc are all physical properties of any substance.
so, the answer is option b - reactivity.
The correct answer is 2.73.
HF is a weak acid which partially dissociates to release H+ and F-
HF → H⁺ + F⁻
Initial 0.0050 0 0
Change -x +x +x
Equilibrium 0.0050–x +x +x
Solve by using the equilibrium expression: = [H⁺] [F⁻]/ [HF]
6 .8 x 10⁻⁴= x. x / 0.0050 –x
6 .8 x 10⁻⁴= x² /0.0050
x² = 6 .8 x 10⁻⁴ x 0.0050
x² = 3.4 x 10⁻⁶
x = 3.4 x 10⁻⁶
[H⁺] = 1.84 x 10⁻³
pH = - log [H⁺] = - log (1.84 x 10⁻³)
pH = 2.73
no because the substance might be harmful
One important example of computer simulation is called molecular modeling. Scientists can use it to test or discover new drugs that might help treat diseases. This method allows scientists to predict what will happen when they introduce a molecule, such as a new medicine, into the human body.
I would go with false but idk