Answer:
B)
Explanation:
Dalton was the first scientist to propose an atomic model. He said that each element is composed of extremely small particles called atoms, which are indivisible, atoms of a given element are identical, and atoms of different elements have different properties.
With the advance of the studies, it was proven that elements are composed of small particles, atoms and that the atoms of each element are identical, and have different properties from atoms of different elements.
But, now we know that the atom can be divisible: it's formed by electrons, protons, and neutrons. So only postulate <em>ii</em> is no longer considered valid.
Answer:
Al
Step-by-step explanation:
The overall reaction is
4Al + 3O₂ ⟶ 2Al₂O₃
The Al atoms lose three electrons each to form Al³⁺ ions:
4Al ⟶ 4Al³⁺ +12e⁻
The O₂ molecules gain those 12 electrons each to form O²⁻ ions.
3O₂ + 12e⁻ ⟶ 6O²⁻
The Al³⁺ and O²⁻ ions combine to form Al₂O₃.
4Al³⁺ + 6O²⁻ ⟶ 2Al₂O₃.
Answer:
8.65 atm
Explanation:
Using ideal law equation;
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (Latm/molK)
T = temperature (K)
According to the information given in this question;
V = 18.0 L
n = 6.20 moles
R = 0.0821 Latm/molK
T = 33°C = 33 + 273 = 306K
P = ?
Using PV = nRT
P × 18 = 6.20 × 0.0821 × 306
18P = 155.76
P = 155.76/18
P = 8.65 atm
Answer:
Duke Ellington's (1941) number 1 hit song, he wrote with Billy Strayhorn was 'Take the A train'.
Explanation: