Answer:
Explanation:
The consulate temperature of phenol water is 659 C
Volume of 3M solution: x
Moles in 3M solution: 3x
C = n/V
1,8 = 3x/0,05dm³
0,09 = 3x
x = 0,03dm³
A student need 0,03dm³ 3M HCl and 0,02dm³ of water.
Answer:
C) 0, +5
Explanation:
P + H2O + HNO3 -> H3PO4 + NO
We consider all compounds that contain phosphorus in the equation
A substance that has no charge has a zero oxidation state
Hence at the reactant, phosphorus has an oxidation state of 0
Let us consider H3PO4 at the product side
Oxidation state of
H =+1×3=+3
O=-2×4=-8
P = ?
H3PO4 is a neutral compound and has 0 oxidation state
The sum of the individual oxidation states of each atoms in H3PO4 is equal to 0
Hence,
+3 + P + (-8) = 0
3+P-8=0
P=-3+8=+5
Hence the oxidation state of phosphorus in H3PO4 is +5
Therefore, the oxidation state of P in the reaction changed from
0 to +5
Phosphorus is said to have undergone oxidation
I think it'd because of (4), the reactivity of gold atoms, or rather, it's unreactivity. Gold, unlike most metals, doesn't form an oxide layer when exposed to air (Which is why it's so valued in jewellery, the metal will never tarnish, only stay gold forever). This makes it weaker, and so it can be formed in to thinner sheets.
However, (3), the nature of bonds between gold atoms also allows for the metal to be flattened, as metallic bonds aren't amazingly strong, and allow for metals to bend. This is what makes pure metals so weak, and why we use alloys.
Answer:
Zinc, hydrochloric acid
Explanation:
A metal plus an acid equals a salt plus water