Answer:
75 inches
Explanation:
A student builds a model of her own bedroom
The scale of the model is 1:25
In the scale model the bed of the student is 3 inches long
Therefore the length of the student's actual bed can be calculated as follows
= 3 × 25
= 75 inches
Hence, the student's actual bed is 75 inches long
Answer:
1027.62 g
Explanation:
For :-
Mass of = 296.1 g
Molar mass of = 27.66 g/mol
The formula for the calculation of moles is shown below:
Thus,
From the balanced reaction:-
1 mole of react with 3 moles of oxygen
Thus,
10.705 mole of react with 3*10.705 moles of oxygen
Moles of oxygen = 32.115 moles
Molar mass of oxygen gas = 31.998 g/mol
<u>Mass = Moles * Molar mass = 32.115 * 31.998 g = 1027.62 g</u>
Answer:
B. binds to the tryptophan repressor when the repressor is bound to tryptophan.
Explanation:
Bacterial genes are commonly composed of operons that are activated or deactivated depends on the needed. If the bacteria need, for example, an amino acid such as tryptophan for synthesizing proteins. An activator "turns on" the transcription that the operon has and produces the amino acid.
On the other hand, if the bacteria have a high presence of tryptophan amino acid, a repressor binds to the tryptophan operator and avoids the amino acid transcription, in consequence, constrain the tryptophan production.
Chemical reaction: 2PCl₃ + O₂ → 2POCl₃.
m(PCl₃) = 194 g.
n(PCl₃) = m(PCl₃) ÷ M(PCl₃).
n(PCl₃) = 194 g ÷ 137,33 g/mol.
n(PCl₃) = 1,412 mol.
From chemical reaction: n(PCl₃) : n(POCl₃) = 1 : 1.
n(POCl₃) = 1,412 mol.
V(POCl₃) = n(POCl₃) · Vm.
V(POCl₃) = 1,412 mol · 22,4 mol/dm³.
V(POCl₃) = 31,64 dm³ at normal pressure and temperature.
Answer:
mixture is created when two or more different substances are physically combined and can be separated back into its original substances. A chemical reaction occurs when two or more substances are combined to form a new substance and cannot be separated back into its original substances.