Answer:
Egg is heterogeneous.
Ranch Dressing is heterogeneous
Windex is homogeneous.
Answer:
D. 9.0x10²³ atoms
Explanation:
First we use <em>Avogadro's number</em> to <u>calculate how many molecules of Si₂H₆ are there in 0.75 mol</u>:
- 0.75 mol * 6.023x10²³ molecules/mol = 4.52x10²³ molecules
There are 2 Si atoms in one Si₂H₆ molecule, that means that in 4.52x10²³ Si₂H₆ molecules there will be:
- 2 * 4.52x10²³ = 9.03x10²³ Si atoms
Thus the answer is option D.
Answer:
a) 1:1
Explanation:
By the ideal gas law:
PV = nRT
Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is temperature.
Both ballons are at the same conditions, so the gases have the same temperature and pressure. The number of moles is the mass(m) divided by the molar mass (Mr). The molar masses are:
Mr(Ne) = 20 g/mol
Mr(Ar) = 40 g/mol
Calling 1 for Ne, and 2 for Ar:
P1*V1 = (m1/20)*R*T1
m1 = 20P1V1/RT1
P2*V2 = (m2/40)*R*T2
m2 = 40P2V2/RT2
V1 = 2V2
m1/m2 = (20P1V1/RT1)/(40P21V2/RT2)
P1 = P2, T1 =T2 so they can be canceled, such as the R:
m1/m2 = 20V1/40V2
m1/m2 = 20*2V2/40V2
m1/m2 = 40V2/40V2
m1/m2 = 1/1
m1:m2 = 1:1
Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances