The reaction is incorrect. The correct reaction is: Na₂SO₄ + Hg(NO₃)₂ → HgSO₄ + 2NaNO₃. The options are:
A. Hg₂SO₄
B. Na₂SO₄
C. Na⁺
D. NO₃⁻
E. SO₄⁻²
F. Hg₂(NO₃)₂
G. NaNO₃
H. Hg⁺²
Answer:
C, D, E, H
Explanation:
The ions are formed after dissociation of the compound in the solution. When they're negatively charged, they're called anions, when they're negatively charged, they're called cations. If the ion is presented on both sides of the reaction, it is called a spectator ion.
Thus, the reaction given:
Na₂SO₄ + Hg(NO₃)₂ → HgSO₄ + 2NaNO₃
So, let's do the dissociation.
Na₂SO₄ is formed by the ions Na⁺ and SO₄⁻²;
Hg(NO₃)₂ is formed by the ions Hg⁺² and NO₃⁻;
HgSO₄ is formed by the ions Hg⁺² and SO₄⁻²;
NaNO₃ is formed by the ions Na⁺ and NO₃⁻.
Thus, the spectator ions are Na⁺, SO₄⁻², Hg⁺², and NO₃⁻.
Answer:
20.67 kcal of energy is released.
Explanation:
It is given that, an exothermic reaction releases 86.5 kJ. We need to convet kJ to calories.
Since,
1 kcal = 4.184 kJ
So,
1 kJ = 0.239 kcal
For 86.5 kJ,
86.5 kJ = (0.239 × 86.5) kcal
86.5 kJ = 20.67 kcal
So, 20.67 kcal of energy is released.
Answer:
The homologous chromosomes form fairs.
Your first step should be to analyse the compound. For example, if the compound is carbon, you know it always has a valence of four, so, if it has a formula C2H4 (ethylene) it obviously has a double bond. There are difficulties here because benzene C6H6 can be considered to have 6 1.5 C-C bonds, being aromatic.
A second step is to look at its structure. Double bonds are traditionally shorter than single bonds; triple bonds shorter still. Covalent bonds do have typical lengths, nevertheless you can still have problems.
<span>A third step is to consider reactivity. For example, if you have a C=C double bond, you can add, say, bromine to it Thus C2H4 gives C2H4Br2, and by adding two bromine atoms you know you have one double bond. Again, benzene becomes an awkward molecule, but because of this, you know benzene does not have double bonds in the traditional sense</span>
Answer: 2 atoms
Explanation: A molecular formula of the compound carbon dioxide is CO 2 . One molecule of carbon dioxide consists of 1 atom of carbon and 2 atoms of oxygen.
