Which of the following has the highest iodine content?  Which of the following has the lowest melting point?

Q: A chemist mixes 8.0 g of carbon tetrachloride with 25. g of thiophene and 85. g of…

A: Introduction: Mass percent is the amount of elements with respect to their mass present in the given…

Q: a) Identify the following as element (atomic or molecular), compound or mixture. b) Explain your…

A: An atom of a element is composed of a single nucleus with a unique number of protons surrounded by…

Q: Chlorine has seven electrons in its valence shell. It accepts an electron to complete its octet and…

A: The chloride ion acts as an electrolyte and is present in all bodily fluids. It helps in the…

Q: An ion has 15 protons, 16 neutrons, and 18 electrons. The symbol for the ion is 31P3+. 31P3-.…

A: An atomic number of an element is identified by the number of protons present in its atoms. The…

Q: Which of the following substances will have the greatest lattice energy? MgS NaF MgO CaO

A: Lattice energy can be defined as the energy required to convert one mole of an ionic solid into…

Q: Which of the following items are pure elements—that is, made up of only one type of atom? Check all…

A: Our Earth is a planet that has abundant minerals. These minerals were formed as a result of the…

Q: Which of these atoms has an oxidation number of 2-? O Sulfur O Chlorine O Aluminum O Neon O Silicon…

A: Oxidation State/number And Valency Valency is defined as the number of electrons present in…

Q: What us the formula for pH? note [H+} is hydrogen ion concentration and [K+] is potassium ion…

A: Introduction pH is a measuring scale which is used to determine acidity or basicity of a solution.…

Q: The atomic number of potassium (K) is 19 and the mass number is 39. How many neutrons does potassium…

A: Atomic number is defined as the number of protons in the nucleus of an atom . Mass number is defined…

Q: Which of the following is/are true regarding salts? O they are an ionic compound O they are…

A: Salts are ionic compound, molecules ,electrolytes and dissociate in the presence of water.

Q: Which elements in each pair is more metallic? Silicon or aluminum

A: Introduction: A pure substance that can't be separated by compound methods, comprising of molecules…

Q: Which of the following levels in the shell model of an atom can hold up to two electrons?   A. The…

A: The model of the shell is partially similar to the model of the atomic shell that defines the…

Q: Given: 2KI +Pb(NO3)2 --> PbI2 + 2KNO3.  How many grams of lead (II) iodide are produced if 0.250…

A: 2KI +Pb(NO3)2 --> PbI2 + 2KNO3 Thus, 2moles of KI with 1mole of Pb(NO3)2 gives 1 mole of PbI2…

Q: Which of the following is NOT TRUE about water? It has a high specific heat. O Ice floats in liquid…

A: Water is the most abundant compound that is present on Earth’s surface(71%). In nature, it can exist…

Q: Atoms of the same element that differ only in the number of neutrons are known as

A: Always the number of protons is same in atoms of the same element. Number of neutrons may vary for…

Q: Which hydrogen atom(s) in the following molecule is acidic? (That is, which hydrogen atom(s) will…

A: Answer - option - 3only

Q: How many total atoms would be in one formula unit of (NH4)3PO4? 20, 4, 18, 16

A: Ammonium phosphate fertilizes lawns that are deficient in nitrogen and phosphates. Ammonium…

Q: Which of the following happens in all chemical reactions (involving molecules) in all living…

A: Energy can be in any forms. Energy  has the ability to work. It can be converted into any forms.

Q: What factors can make a compound called as a salt? Specifywhich of the following compounds are…

A: An ionic compound made up of cation from the base wheras an anion from the acid are the factors that…

Q: Which statement best explains why alcohols have a higher boiling point than Alcohols have weaker…

A: Alcohols are polar molecules and alkanes are non-polar molecules. Alcohols and alkanes both are…

Q: If penguinium (element number 119) is ever discovered, what will its electrom configuration be?* O…

A: Introduction A Pure Substance Made Up Entirely Of Atoms With The Same Number Of Protons In Their…

Q: Which do you think has a higher boiling point, pentane or neopentane (2,2-dimethylpropane)? Why?

A: The boiling point is the temperature at which the pressure of the liquid changes to the state of the…

Q: At room temperature, substance 1 is a gas while substance 2 is a liquid. Which of the following is…

A: A state of matter is defined as one of the distinct forms that various phases of matter take on. The…

Q: Magnesium has an atomic number of 12 and an atomic mass of 24. Which of the following statements is…

A: Magnesium is a chemical element with the symbol Mg and atomic number 12.

Q: 46

A: Ions are the species that are marked with some kind of charge. The charge can be either a positive…

Q: Which equation represents a chemical reaction that obeys the law of conservation of matter? O…

A: Mass cannot be produced nor be destroyed, it can be converted So the reaction in which equal number…

Q: Arrange the elements Na, Si, and S in the order of (a) decreasing atomic radius. (h) increasing…

A: Atomic radius: It is half the distance between nuclei of two atoms of the same element when the…

Q: When copper and sulfur react, two products are possible: copper(I) sulfide, Cu2S, and copper(II)…

A: For copper(I) sulfide 2Cu(+1) + S(-2) gives Cu2S Copper(II) sulfide Cu(+2) + S(-2) gives CuS These…

Q: The following items are ions: O Na+, NO2, H+ O CO2, K+, Ca+ Na+, H+, K+ СО2, Н20, NO2

A: The human body contains many ions such as sodium, potassium, calcium, chloride ions.  They are…

Q: Trans-oleic acid (18:1,D9) has a melting temperature of (44.5C) and cis-oleic acid (18:1,D9) has a…

A: Oleic acid is an 18 carbon long mono-unsaturated fatty acid which bears double bond at carbon number…

Q: Ibuprofen, widely used as a pain reliever, has limited solubility in water, less than 1 mg>mL.…

A: Ibuprofen is a drug that is used as a pain reliever. The structure of Ibuprofen is given as follows:

Q: 1.1 Which of the following statements is true for the chemical depicted below?…

A: A hydrocarbon chain is an organic compound made up solely of carbon and hydrogen atoms linked…

Q: (i) MnO is basic whereas Mn207 is acidic in nature. Why? (ii) Transition metals form alloys. Why?…

A: Chemical compounds are the important basis of life. The compounds that are obtained from living…

Q: In H2O how many hydrogen (h) atoms are present

A: Answer- 2 atoms. In H2O 2 hydrogen atoms are present.

Q: Which of the following plays the greatest role in chemical bonding number of protons in the valence…

A: chemical bonding is the interaction between two or more ions or atoms or molecules.  When the two…

Q: Ethyl mercaptan is an odorous substance added to natural gas to make leaks easily detectable. A…

A: Given: Ethyl mercaptan is an odorous substance added to natural gas to make leaks easily detectable.…

Q: Which are the Trace Elements: Less than 0.01% of Total Atoms in the Body?

A: On Earth, 92 elements are found in their native state. Only 11 of these elements are present in…

Q: Which of the following terms describes when weak forces are broken, drastically changing the shape…

A: Proteins are biomacromolecules which play very important role in maintaining most of the cell…

Q: Iodine has 37 known isotopes.  Therefore, the atomic mass has a range of 108-144 amu. Which of the…

A: Iodine is a trace element that is naturally present in some foods, added to others, and available as…

Q: The freezing point of water is 0.00°C at 1 atmosphere. A student dissolves 10.56 grams of aluminum…

A: molality = weight of solute*1000/gram molecular weight of solute* weight of solvent in g =…

Q: Lemon juice has a pH around 2.5. Milk has a pH around 6.5-7. Which of the following statements about…

A: A universal indicator is a mixture of different indicators or dyes which has many different colors…

Q: FREE RESIDUAL CHLORINE IS 1. Chloramide compounds 2. hypochlorous or chloric acid 3. haloform…

A: Introduction :- The quantity of chlorine that remains in the water after a given period or contact…

Q: Which of the following neutral atoms contains six (6) Valence electrons Nitrogen, atomic number 7…

A: valance electrons  are the nuber of electrons present on the outtermost orbital .  these electrons…

Q: :OH KMNO4

A: Potassium permanganate (KMnO4) is a very strong oxidant which is able to react with many functional…

Q: The triple point of an element is at 75 torr and 125°C. This means that liquid is more dense than…

A: Various biochemical and physiological processes occurs in the cells resulting in various activities…

Q: Which of the following is a hydroxide ion?     H3O +     H +     H2O -     OH -

A: Hydrogen is defined as the chemical element, having the symbol H. It has the atomic number 1. The…

Q: How many protons, electrons, and neutrons are present in the following ? Magnesium cation (Mg2+),…

A: Atomic number (Z) is the total number of protons that is present in an atom. Mass number (A) is the…

Q: 11

A: Ans- B

Q: In 5H2O how many hydrogen (H) atoms are present

A: Hydrogen atom is chemical atom which has atomic mass and number as 1. It has a single proton In it's…

Q: find the viscosity of the following using perry's table 2-312, 2-318 8th edition Air at 30°C 89%…

A: Viscosity is caused by friction within a fluid. It is the result of intermolecular forces between…