1 Answers
Call
Talk Doctor Online in Bissoy App
If glucose is absent, but so is lactose, the lac operon will be ________.
1. activated
2. repressed
3. activated, but only partially
4. mutated
RepressedNo transcription of the lac operon occurs. cAMP levels are high because glucose levels are low, so CAP is active and will be bound to the DNA. However, the lacrepressor will also be...
1 Answers 1 views
Acid Rain is caused by the air pollutant--
carbon monooxide
carbon dioxide
sulphur dioxide
nitrogen oxide
Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. However, the most important gas which leads...
1 Answers 1 views
Determine the density of sulphur dioxide , SO2 gas in g/L at 25 deg C and 100 kPa
Molar Mass of SO2 = 64.0661 kPa = 0.00987atm= 100× 0.00987= 0.987atmT = 273+25 = 298KDensity = (64.066 × 0.987)/(0.0821×298)= 63.233/24.466= 2.58g/L
1 Answers 1 views
what product of the combustion of a hydrocarbon occurs only when the supply of oxygen is limited? a. sulfur dioxide b. nitrogen dioxide c. carbon dioxide d. carbon monoxide
c. carbon dioxide
1 Answers 1 views
What is the procedure of using animal blood to make activated charcoal using potassium carbonate?
Activated charcoal adsorbs many poisonous chemicals, drugs, and toxins, such as opium, cocaine, morphine, nicotine, salicylates, strychnine, kerosene, barbiturates, and antidepressant pills, to name but a few. It helps to...
1 Answers 1 views
Silicon dioxide with the chemical formula SiO<sub>2. </sub>how many moles of silicon dioxide are there in 25<sup>-3</sup>g of silicon dioxide
Molar mass of SiO2 = 60.08 g / mol .Moles of SiO2 = mass of SiO2 / molar mass of SiO2 ..............= 25-3g / 60.08 g / mol.
1 Answers 1 views
equivalent weights of sulphur dioxide oxygen are mixed in an empty container at 25 deg celsius. the fraction of the total pressure extended by oxygen at the same temperature is
x v SO2-------gt;SO2 64 22.4 v=0.35X x v O2--------gt;O2 32 22.4 v= 0.7x 2/3 (66.6666 %) is the part of O2
1 Answers 1 views
The percentage composition of a compound is 79.9% copper and 20.1% sulphur. The mass of a sample of the compound is 160.0 g. What are the masses of the copper and sulphur in the sample?
m = mcompound * W m(Cu) = 160 g * 0.799 = 127.84 g M(S) = 160 g * 0.201 = 32.16 g.
1 Answers 1 views
how many atoms of oxygen are there in three molecules of sulphur dioxide?
Solution:sulphur dioxide = SO2There is one atom of sulfur (S) and two atoms of oxygen (O) in one molecule of sulfur dioxide (SO2).Hence,there is 3×1 = 3 atoms of sulfur...
1 Answers 1 views
The heat of combustion of sulphur in excess air to produce sulphur(iv)oxide is -297KJmol^-1. Calculate the heat change if 6.4g of sulphur is completely burned in excess air.(S=32)
While combustion of 1 mol of sulfur 297kJ/mol is released.From a given mass we found actual number of moles: n=m/M.n=6.4/32=0.2 (moles).∆H=0.2×(-297)=-59.4 (kJ/mol).
1 Answers 1 views