Answer:
215 mL of silver nitrate are needed.
Explanation:
Let's think the reaction:
Na₂CrO₄(aq) + 2AgNO₃(aq) → Ag₂CrO₄ (s) ↓ + 2NaNO₃(aq)
First of all, we determine the moles of chromate we have available.
Molarity = mol / volume(L)
We convert volume to L → 75mL . 1L / 1000mL = 0.075 L
Molarity . volume(L) = moles → 2.50 M . 0.075L = 0.1875 moles
Ratio is 1:2. For 1 mol of chromate I need the double of moles of nitrate.
So, for 0.1875 moles of chromate I would need (0.1875 . 2) = 0.375 moles of nitrate. Let's determine volume of solution
Molarity = mol/ volume(L) → volume (L) = mol / Molarity
volume (L) = 0.375mol / 1.74M → 0.215L
We convert the value to mL → 0.215L . 1000mL/ 1L = 215 mL
Well the tempeatrue of any liquid is reduced the thermal motins
Every element has different amount of protons and the atomic number is how much protons there are.
Answer:
true
Explanation:
I'm not sure why cause I dont know how to explain but it's TRUE
Answer:
Ionic bonding: C
Covalent bonding: B
Metallic bonding: D
Pauli exclusion principle: A
Explanation:
All the electrons in 1 atom are characterized by a series of 4 numbers, known as quantum numbers. These numbers (n, l, ml, ms) describe the state of each electron (in which level, sublevel, orbital it is and its spin). For 2 electrons to coexist in the same atom they must differ in at least of these numbers. If they occupy the same level, sublevel and orbital, then they must have different (and opposite) spins. This is known as Pauli exclusion principle.
Also, to gain stability atoms can gain, lose or share electrons. In doing so they form bonds. There are 3 kinds of bonds:
- Ionic bonding: these are formed between metals and nonmetals. Metals tend to lose electrons and form cations (positive ions) and nonmetals tend to gain electrons and form anions (negative ions). Cations and anions attract each other due to <em>electrostatic forces</em> between <em>oppositely charged ions</em>.
- Covalent bonding: these are formed between nonmetals, which share pairs of electrons so as to reach the <em>electron configuration</em> of the closest noble gas (the most stable electron configuration).
- Metallic bonding: valence electrons are loose in metals, so they move together as a "sea of electrons", acting as <em>"glue"</em> of the remaining positive <em>cores</em> (electrons that are negative charges serve to attract the positive charges of the cores).
