It's 2) a positively-charged nucleus is surrounded by mostly empty space (aka Rutherford's Model).
Most of the atom's mass is inside the nucleus (which contains protons [+] and neutrons [0 charge]), while the electrons [-] "float" around the nucleus like clouds. This is why it's said that the atom is 'mostly empty space'.
The color, shape, volume, mass, etc.
Answer:
K(79°C) = 1.906 E7 s-1
Explanation:
Arrhenius eq:
∴ A = 5.0 E9 s-1
∴ Ea = 16.3 KJ/mol
∴ R = 8.314 E-3 KJ/K.mol
∴ T = 79°C ≅ 352 K ⇒ K = ?
⇒ K(79°C) = (5.0 E9 s-1)e∧[ - (16.3KJ/mol)/(8.314 E-3 KJ/K.mol)(352 K)]
⇒ K(79°C) = (5.0 E9 s-1)e∧(- 5.5697)
⇒ K(79°C) = (5.0 E9 s-1)*(3.811 E-3)
⇒ K(79°C) = 1.906 E7 s-1
Answer:
144.08 g of H₂O
Explanation:
The balance chemical equation for the synthesis of water is as follow;
2 H₂ + O₂ → 2 H₂O
Step 1: <u>Find out moles of H₂O produced as;</u>
According to balance chemical equation,
1 mole of O₂ produced = 2 moles of H₂O
So,
4 moles of O₂ will produce = X moles of H₂O
Solving for X,
X = 4 mol × 2 mol / 1 mol
X = 8 moles of H₂O
Step 2: <u>Calculate Mass of H₂O as;</u>
Mass = Moles × M.Mass
Mass = 8 mol × 18.01 g/mol
Mass = 144.08 g of H₂O
Answer:
Explanation:
The solid consists of positive and negative ions, so it is an ionic solid.
Ionic solids are brittle, usually water-soluble, and poor thermal conductors as solids. Thus, the correct answer is 
.
(A) is wrong. It describes a covalent solid, which is soft and always a poor conductor.
(B) is wrong. It describes a covalent solid, which is also low-melting.
(D) is wrong. It describes a metal, and a metal does not contain negative ions.
