Chlorine, Cl , is located in period 3, group 17 of the periodic table, and has an atomic number equal to 17 . This tells you that a neutral chlorine atom will have a total of 17 electrons surrounding its nucleus. Now, notice that the first energy level doesn't not contain a p-subshell,
Answer:
B.
Explanation:
Because when a pistol is fired, chemical changes happen to light the gunpowder or whatever substance to create the noise or effect.
Answer:
D. Al(s) + O₂(g) → Al₂O₃(s)
Explanation:
Aluminum is a solid metal, so it is written as Al(s).
Oxygen is a diatomic gas, so we write this compound as O₂(g).
Aluminum oxide has the formula Al₂O₃ because in oxides the oxidation number of oxygen atom is -2 and for aluminum, the oxidation number is 3. Thus, we write this compound as Al₂O₃(s).
Now, we have to found the chemical equation in which the reactants (left side) are Al(s) and O₂(g) while the product (right side) is Al₂O₃(s). From the options, we can see that the correct is (D):
Al(s) + O₂(g) → Al₂O₃(s)
Answer:
4.4 × 10⁴ g/mol
Explanation:
The osmotic pressure (π) is a colligative property that can be calculated using the following expression.
π = M × R × T
where,
M: molarity
R: ideal gas constant
T: absolute temperature (27°C + 273.15 = 300 K)
Let's use it to find the molarity of the protein.
M = π / R × T
M = 0.053 atm / (0.082 atm.L/mol.K) × 300 K
M = 2.2 × 10⁻³ M
The molarity of the protein is:
M = mass of the protein / molar mass of the protein × liters of solution
molar mass of the protein = mass of the protein / M × liters of solution
molar mass of the protein = 22 g / 2.2 × 10⁻³ mol/L × 0.226 L
molar mass of the protein = 4.4 × 10⁴ g/mol