Answer:
b. 16 protons, 18 neutrons, and 18 electrons
Explanation:
Things to be remembered
Negative charge on any ionic species indicates gained the electrons
Positive charge on any ionic species indicates lost the electrons
A sulfur atom has 16 protons, 18 neutrons, and 16 electrons, A sulfide ion has a 2– charge which indicates that sulphur has gained two electron from any other atom, ion or species!
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Answer:
[Ne] 3s² 3d³
Explanation:
According to aufbau's principle of filling electronic orbitals, the sublevels with lower energies are filled up before those with higher energies.
One important to know about this principle is that sublevels do not fill in numerical order.
The order of filling is;
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f e.tc
From the given choices the wrong one is;
[Ne] 3s² 3d³
3p fills up before 3d;
Answer:
4. 393.3 kJ/mol.
Explanation:
1. H2O(ℓ) → H2(g) + 1/2O2
∆H = 285.8 kJ/mol.
2. CH4(g) + 2O2(g) → CO2(g) + 2H2O(ℓ)
∆H = −890.0 kJ/mol.
3. CH4(g) → Cgraphite(s) + 2H2(g)
∆H = 74.9 kJ/mol.
Flipping and then multiplying Equation 1. by 2,
2H2(g) + O2 → 2 H2O(ℓ)
∆H = -571.6 kJ/mol.
Note: ∆H sign changes.
CO2(g) + 2 H2O(ℓ) → CH4(g) + 2O2(g)
∆H = 890.0 kJ/mol.
Adding all the equations and enthalpies together,
2H2(g) + O2 → 2H2O(ℓ)
CO2(g) + 2H2O(ℓ) → CH4(g) + O2(g)
CH4(g) → Cgraphite(s) + 2H2(g)
= CO2(g) → Cgraphite(s) + O2(g)
= (-571.6 + 890.0 + 74.9)
= 393.3 kJ/mol.
Answer:
The solution is 4.93 molal
Explanation:
We assume that solution is aqueous.
We need to apply the colligative property of elevation of boiling point:
ΔT = Kb . m . i
ΔT = Boiling T° of solution - Boiling T° of pure solvent
110.1°C - 100°C = 10.1°C
Kb = 0.512 °C/m
m = molality → unknown
i = Van't Hoff factor (numbers of ions dissolved)
We assume 100 % dissociation: CoCl₃ → Co³⁺ + 3Cl⁻ i = 4
We have 1 mol of Co³⁺ + 3 moles of chlorides
We replace data → 10.1°C = 0.512°C/m . m . 4
10.1°C / (0.512 m/°C . 4) = m → 4.93
Answer:
No, since DNA is quite fragile and the methods used in this experiment tend to break it apart. Scientists, therefore use special chemicals and procedures to protect DNA. For example, they add chemicals to control the acidity of the solution. Scientists use other chemicals to cut DNA apart very precisely to look at one part at a time. This process can take several days to several weeks
Explanation:
Is the DNA in any cell in the human body the same? Explain your answer.
Yes, in a multicellular organism (such as a human or a strawberry), all cells contain the same DNA. However, multicellular organisms have many different types of cells. For example, humans have liver cells, muscle cells, skin cells, brain cells, and the list goes on. It is not the DNA that makes each cell different but rather the way it is regulated by the cell. The combinations of genes that are turned on and off are what determine the shape of the specific cell along with its specific function.