Step-by-step explanation:
Density = mass/volume
1. Work out the density of ethanol and benzene
Ethanol - mass = 3.9 g and volume = 5 mL
Density = mass/volume =3.9/5=0.78g/mL
Benzene - mass=4.4g and volume = 5 mL
Density = mass/volume = 4.4/5=0.88g/mL
So Benzene is more dense
2. Density=mass/volume=25/7-2=5g/mL
The reason why the volume of the object is 7mL - 2mL is because the amount of displaced water is the volume of the object
3. For the Bohr Model, google the image of it.
Protons are positive charged
Neutrons are neutral
Electrons are negative charged
4. Main difference is the location of the electron in the atom.
Bohr Model : electrons orbits the nucleus in fixed paths
Electron cloud model: only the electron's probable location is determined