Give TWO (2) purposes of the small hole that some ballpoint pens have in their main body.

Q: Aqueous 50.5 % (w/w) sodium hydroxide has a density of 1.53 g cm–3. Calculate the concentration of…

A: We have to calculate the concentration in given unit.

Q: 6. О H3C + H20

A:

Q: How many grams of Pb(NO,)2 (331.2 g/mol )are needed to prepare 300 ppm (w/v) of Ph (207.2 gmol) in…

A: Given information, Molar mass of Pb(NO3)2 = 331.2 g/mol Volume of solution = 1 L = 1000 mL ppm…

Q: 1. Explain what the functions of the clay triangle and wire gauze are for an apparatus? (In 2…

A: Function of clay traingle = A clay traingle is used to hold the dishes and crucibles when they are…

Q: Calculate the selubility df CusCN in OilM Na S2Q> 2:3x107

A: Given [Na2S2O3(aq)] = 0.1 M  From mass balance, [S2O32-(aq)] = 0.1 M

Q: If a 250 mL glass of water contained 5.00 ppb, what mass of lead is in the glass of water? Assume…

A: The ppb is the form of concentration which can be represented as; ppb=Mass of solute (in g)Mass of…

Q: what chemical equation produce when 5 mL of concentrated hydrochloric acid and 3 drops of 2%…

A:

Q: What mass (in grams) of Mg(N03)2 is present in 145 mL of a 0.150 M solution of Mg(NO3)2 (At wt Mg…

A: Since, Moles of Mg(NO3)2  Present = molarity of solution X Volume of solution in L Molarity of…

Q: Calculate the empirical formula for each over-the-counterpain reliever(a) acetaminophen (Tylenol):…

A: (a) For calculation of the Empirical formula of acetaminophen (Tylenol) Element  % Composition…

Q: -what is the Definition of surfactant ?  2- The role of surfactant in nanomaterial ?

A: Surfactants are compounds that lower the surface tension between two liquids, between a gas and a…

Q: The Ksp value for calcium sulfate [CaSO4] is 2.40 X 10*5 and a professor made 1825 mL of a CaSO4(29)…

A: Ca+² = 0.375 M + ( 6.39 × 10-⁵ M ) Ca+² = 0.375063 M   The new Concentration (Molarity) of Ca+² =…

Q: What is the Oxygen saturation in water with a salinity of 10,000 mg/L at 15 °C ? Use water density…

A: given : salinity = 10000 mg/L at 15°C density of water = 1000 kg/m3 degree of saturation = dissolved…

Q: (a) What is "Calcination" in Refractories? What is its purpose during the manufacture of…

A: Calcination is basically a purification process. It is the process of heating a solid at high…

Q: (a) Calculatethe concentration of mercury: (i)in g/L (microgram per liter), and (ii) in mol/L.(b)If…

A: a) Part per billion (ppb) concentration defines the microgram of solute dissolved in 1 L solvent. 1…

Q: A concentration of carbon monoxide of 4000  ppm  (0.400 %  by mass) in air is lethal in about half…

A: Given: Volume of car = 2.9 m3. Since 1 m3 = 1000 L Hence volume of car in L = 2900 L

Q: Explain in detail. 1a)Does the production of biofuels disrupt global biodiversity   b)Explain…

A: Biofuel production can affect wild and agricultural biodiversity in some positive ways, for…

Q: The molar concentration of 290 ppm of Cs+ (132.91 g/mol) in a solution that has a specific gravity…

A: Given: Concentration of Cs+ in ppm = 290 ppm And specific gravity of solution is 1.08. Since density…

Q: This section in a Safety Data Sheet contains information on the persistence and degradability of the…

A: Ecological information

Q: 2- Why does sodium chloride make distilled water more electrically

A: We are authorised to solve only one question at a time. Please post rest of the questions…

Q: The temperature of your water was 22.4 degrees Celsius. The volume of hydrogen collected was 30.2…

A:

Q: 4) Does it matter if the coin is heads or tails? Why or why not?

A: Surface tension is the inclination of liquid surfaces to contract into the smallest possible surface…

Q: The molar concentration of 290 ppm of Cs+ (132.91 g/mol) in a solution that has a specific gravity…

A: given molar concentration = 290 ppm =290 mg/L = 290*10-3 g/L

Q: Which of the following is FALSE regarding water treatment?   Settling of floc during sedimentation…

A: Water is a compound that contains an oxygen directly bonded to two hydrogen atoms with the formula…

Q: 7HN CI

A: The reaction given is,

Q: 1. What is the mass concentration of water vapor (g H2O per m3 of air) in a liquid-water doud at a…

A: Given,

Q: Believe it or not, there is gold dissolved in the Earth’s ocean! The concentration can run as high…

A: We have to calculate mass of gold.

Q: You are asked to compound one-hundred 2.5 mL syringes of 2.5% testosterone cream. What quantity of…

A: Since there is confusion of the given volume. I am not clear weather it is 2.5 ml or 102.5 ml so I…

Q: A bubble of air escaping from a diver's mask rises from a depth of 155 ft to the surface where the…

A: Given the depth of water from the surface, h = 155 ft * 30.48 cm1 ft*1 m100 cm= 47.244 m The volume…

Q: There are three different ways in which salting' can take place. What is salting and why, though it…

A: Salting : Salting is a food preservation technique in which the food is surrounded in salt and left…

Q: How would you prepare 1.5 L of approximately 0.1 M KMnO4?

A: Given: Volume of KMnO4 = 1.5 L Concentration of KMnO4 = 0.1 M Molar mass of KMnO4 = 158.034 g/mol

Q: What is the full form of ppm ? For what purpose it is used.

A: The term ppm can be described as the types of the mass related units that would be used to determine…

Q: The water sample from the polluted estuary (number 4), was then subjected to a series of…

A: Many problems in analytical chemistry begin with the need to identify what is present in a sample.…

Q: Cite 3-5 possible applications of determining the melting point of a substance. Explain briefly.

A: In addition to that, melting point is often used to predict the partition behavior of a chemical…

Q: In the Hoffman apparatus, the solution conducts electricity and water is decomposed to hydrogen at…

A: The Hoffman apparatus is used for the electrolysis of water. For electrolysis the water should be…

Q: A river pollutant is found to have a concentration of 0.0031 % m/v. If the density of the river…

A: Given  %(m/v) = 0.0031 %  density of solution = 1.183 gram/mL  Concentration of the pollutant in ppm…

Q: OH OH OH CrO3 / H* 1 2 3. 4

A: CrO3 is an oxidizing agent and will oxidize primary alcohol to aldehyde and secondary alcohol to a…

Q: Is molecules A and B identical? Is molecules C and D identical? What structural feature accounts for…

A: The compounds having the identical number of atoms in their chemical formula but having different…

Q: Scenario 2: Marissa is an extremely curious sixth grader. During a snow day she looked out her…

A: Given : A paragraph is given. To find : Possible testable question that Marisa can ask from the…

Q: The Ottawa Charter is increasingly used to guide the development of health promotion activities in…

A: The very first  international conference on health promotion was held on Ottawa on 1st November,…

Q: what chemical equation produce when 5 mL of concentrated hydrochloric acid and 3 drops of 2%…

A: Normally Vanaspati is prepared from vegetable or seed oil by the hydrogenation process. It is…

Q: What is the method of analysis for the chemical pollutants of soil pollution?

A: The most common soil pollutants are heavy metals such as Lead (Pb), Mercury(Hg), Arsenic(As) ,…

Q: 10a

A: Buffer solution range is pH =  ( pKa + 1 to pKa -1 ) and good buffer solution at pKa = pH  Buffer…

Q: Write the dissociation equation and the Ksp expression for Ca3(PO42(s).

A: The Ksp expression is written from the dissociation reaction of any compound.

Q: Is it acceptable to recycle the containers of hazardous chemicals? Why or why not? Explain your…

A: Yes , it is  acceptable to recycle the containers of hazardous chemicals. The residue within empty…

Q: How does the concept of “representativeness” relate to proper sampling and analysis of environmental…

A: The term 'Representativeness' when used related to testing, means that a small sample that was…

Q: What is Donnan's theory? What is its importance in biophysical chemistry?

A: Here we have to explain Donnan's theory and its importance in bio physical chemistry.

Q: It measures the amount of water used to produce the goods and to provide services. Water quality…

A: We have to select the correct option which measures the amount  of water used to produce the goods…

Q: Believe it or not, there is gold dissolved in the Earth's oceans! The concentration can run as high…

A: Answer:- this question is answered by using the simple concept of calculation of mass using the…