1) 2 mol of Al; 3 mol of S
2) 1 mol Na; 1 mol N; 3 mol O
3) 1 mol Ba; 2 mol O; 2 mol H
Answer:
At temperatures greater than 756 °C this reaction is spontaneous under standard conditions.
Explanation:
Let's consider the following reaction.
C(s) + H₂O(g) ⇄ CO(g) + H₂(g)
The reaction is spontaneous when the standard Gibbs free energy ΔG° < 0. ΔG° is related to the standard enthalpy of the reaction (ΔH°) and the standard entropy of the reaction (ΔS°) through the following expression.
ΔG° = ΔH° - T.ΔS°
If ΔG° < 0
ΔH° - T.ΔS° < 0
ΔH° < T.ΔS°
T > ΔH°/ΔS° = (131.3 × 10³ J/mol)/(127.6 J/K.mol) = 1029 K
The temperature in Celsius is:
°C = K - 273.15 = 1029 - 273.15 = 756 °C
<span>The mixture of pepper and water is a suspension because of the particles, You see, a suspension is a mixture in which particles can see and easily separated by setting or filtration. Unlike a solution, a suspension does not have the same properties throughout it contains visible particles that are larger than the particles in solutions or colloids </span>
Answer:
D.
Explanation:
In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.
Oxygen has a total number of eight (8) electrons and as such the
is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon that has a total number of ten (10) electrons.
Hence,
contains the same number of electrons as an atom of neon.
Answer:
Sodium and Magnesium
Explanation:
The elements in Groups 1 and 2 get more reactive as you go down the group.
This means that Sodium is more reactive than lithium and Magnesium is more reactive than beryllium.
On the periodic table, as you go down the group, the reactivity of an element increases. Especially with metals in group 1 and 2. Now Lithium is a metal of group 1, followed by Sodium, while Beryllium is a metal in group 2, followed by magnesium. That's how I picked the answers