Which of the following used to be more precious than gold or silver, due to difficulties in refining it?   a. Iron b. Copper c. Aluminum d. Zinc e. Tin

Q: Determination of ash content is part of the proximate analysis in food laboratories which provides a…

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Q: Metals are both malleable and reactive. Which statement correctly describes these two properties of…

A: a element is said to be metal if it easily donates electron, its ionization energy is low .

Q: Which of the following is not a property of metals? They are good conductors of electricity. A They…

A: The question is to identify which of the of given properties is not a property of metal -

Q: A baby's spoon with a surface area of 6.25 cm² is plated with silver from AgNO3 using a current 2 A…

A: Given : Surface are of spoon = 6.25 cm2  Current = 2 A And time = 2 hr 25 min = 145 mins…

Q: If sucrose costs $1.20 per pound, and a bottle contains 2.00 kg, how much would you pay for a case…

A: we know that, kg and pound are related ro each other as;2.205 pounds=1 kilogram1 pound=12.205*1…

Q: How do metals react in a period?

A: Metals having tendency to loose electrons, and the tendency of an element to lose electrons…

Q: Predict the sign of ΔS for

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Q: c. FeS(s) + 2HCI(aq) → H2S(g) + FeCl2(aq) Soth (b) and (c) a. 2Sb(s) + 31g) b. 2H9O(s) → 2Hg(l) +…

A: Decomposition reaction are the reactions in which the reactant breakdown to form two or more…

Q: Use the standard entropy data to determine the change in entropy for each of the reactions listed (…

A: Since you have posted question with multiple sub-parts, we are entitled to answer the first 3 only.…

Q: An ore is analyzed for the manganese (Mn) content by converting the Mn to Mn3O4 and weighing it. If…

A: % of  Mn2O3   =   4.73 %  %  of  Mn        =   3.29 %

Q: O+Cl, (g) = PCI, (g)

A: Dear student I have given answer to your question in the image format.

Q: What is the characteristic that distinguishes metals from one another?

A: The characteristics that distinguishes metals from one another is  malleability, ductility,…

Q: Which common inexpensive metal was more valuable than gold in the nineteenth century?

A: Solution:       Aluminum is considered as the third most abundant element in the earth crust after…

Q: Use the information and models to answer the following questiön. A group of students are trying to…

A: Electrical conductive material are those which can transfer charge from one end to other end.

Q: In a pure sample of blue vitriol the Copper content is 25.45%. Calculate the new percentage of…

A: Given :  Copper content in blue vitriol = 25.45 %  Blue vitriol is CuSO4.5H2O while on oven drying…

Q: a) FeCl3 (aq) b) CuSO4(aq) c) NiCl2(aq) O a) 10 F b) 2 F c) 12 F O a) 3 F b) 1 F c) 2 F O a) 3 F b)…

A: The questions based on Faraday's first law of electrolysis.   it states that mass of an element…

Q: Unknown D: In a clean and dry crucible with cover, weighing 25.234 g some of the unknown hydrate…

A: Given: Unknown hydrate CaCl2.nH2O Weight of clean, dry crucible cover =25.234 g Mass after placing…

Q: b,PO, wi (aq) (s) (g)

A: Given compound is Rb3PO4 . Chemical name of  Rb3PO4  is Trirubidium phosphate .

Q: Which option provides the best evidence of a chemical change? O A. A solid is not visible after it…

A: The change which is brought about by the difference in the physical appearance of the species in…

Q: neutralization, the products are   A. sodium chloride   B. salt and water   C. a nonmetal…

A: Neutralization reaction It is a reaction between an acid and a base

Q: When we say that lead is a denser metal than aluminum, are we talking about anextensive or intensive…

A: Intensive Property • does not depend on the amount of the substance. • even if you change the amount…

Q: A sample of stainless steel contains 10.5% chromium by mass. What mass of chromium, in grams, is…

A: Given information,             Stainless steel sample contains 10.5% chromium by mass.…

Q: Part A Measure and record the masses of all the metal strips you set out in front of the test tubes.

A: 1. molar mass of Magnesium is24.305 g/mol. 2. Zinc mass number of 65.39 g/mol. 3. Copper atomic mass…

Q: What is an element? A. Oxygen and nitrogen joined together. B. A piece of pure nickel C. A water…

A: The question is based on the concepts of general chemistry. it talks about elements which is purest…

Q: The relative error calculated for the analysis of Zn alloy was -4.1%. Assuming that the sample is…

A: The relative error is the ratio of absolute error to the measurement being taken multiplied by 100.…

Q: 22) An 85.5-g sample of Hg in a barometer 23) A 0.251-g Ti metal heart valve 24) A 10.0-g sample of…

A: 22) Given: Mass of Hg = 85.5 g Atomic mass of Hg = 200.59 g/mol.

Q: A 67.2 gg sample of a gold and palladium alloy contains 3.55×1023 atomsatoms . A) What is the mass…

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Q: A student places 1.520 grams of copper wire along with excess sulfur into a crucible (and cover),…

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Q: Complete this sentence  THe electrical conductivity of a sample will       when the size of the…

A: When a Voltage is applied to the electrode dipped intoan electrolytic solution , ions of the…

Q: 21. In the below figure, what does 'a' representa? a Limestone, Siles, Alumina etc. Grinding (a)…

A: 21. C

Q: 4. Zn(s) + Ni2(aq) Zn*(aq) + Nics) 5. Pb(s) + Sn*2(aq) Pb*2(aq) + Sn(s) 6. Al(s) / Al*3(aq) //…

A: Since you have posted multiple questions, we will solve first one for you. To get remaining parts…

Q: 16. What is 20.0 °C in K and "F? A: 293.2; 68.0

A: The temperature 20.00C is to be converted to other scales of temperature.

Q: certain alloy with a density of 11.5 g/cm3 contains 55% iron by mass. a) How many pg of iron would…

A: Density is defined as the mass per unit volume. It is represented by rho . Its relation is as…

Q: Mass of watch glass and evaporating dish:67.511 g   Mass of watch glass, evaporating dish, and Mg…

A: We can calculate mass of Mg,Cl, product by calculating mass before and after the reaction.

Q: What do metals and nonmetals have in common? A both have high melting and boiling points B both are…

A: Metals are those elements which donate electrons. Non metals are those elements which accept…

Q: 26,000 nanoliters = ? dekaliters %3D 26.9 = ? 62 = ? %3D

A: The properties of matter are mainly two types. These are extensive properties and intensive…

Q: How can a blacksmith help teach metals and non metals

A: A blacksmith is a metalsmith who creates objects from wrought iron or steel by forging the metal . A…

Q: Mass of watch glass, filter., and CaCO3 13.57 g Mass of watch glass and filter Mass of CaC03 12.43 g…

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Q: { Al/Pb Zn/Mg Al/Mg Fe/Pb Al/Fe Fe/Mg Al/Sn Fe/Sn Zn/Fe Pb/Sn Zn/Sn Pb/Mg Zn/Pb Sn/Mg

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Q: Explain why are some metals found in their elemental states in nature? Give some examples? Why are…

A: The substance that shows the luster on freshly cutting, polishing, and has the thermal, electrical…

Q: d) NH, e) H,S f) SiF,

A: According to the question, we need to draw the electron dot structure of the compounds.  A Lewis…

Q: is stone a matter? why?

A: Matter: It is a substance that occupies space and has a certain mass. For example, if you consider a…

Q: is heated with 1.80 gof bromine. All the bromine is used upj and 2.07 g of magnesium bromide is the…

A: Massof magnesium remains unreacted = 6.856g

Q: sodium is not kept in  a  petrol  b  k oil  c  n hexane d  water

A:

Q: A sample of metal weighing 1.4 g is combined with oxygen; the metal oxide weighs 33.5 g. The mass…

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Q: १ १कजाdपior oप्टवox পeवcमन्No s o ০Xवीरटठ न० No Cmd fes+ छि गबबेपव्टd क० Fe2t . Conmpee व्ल bवकee…

A: The given redox reaction is: NO+Fe3+→NO3-+Fe2+

Q: What states of matters do metals typically exist

A: Metal:Metals are situated on the left-hand side of the periodic table. The metals are…

Q: SiO2 (s)+ C(s)Si(s) + CO(9) a. SIO2(s) C(s)- Si(s) + |CO() > b. Liquid silicon tetrachloride is…

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Q: 8. A 2.856-g sample of limestone was analyzed for Fe, Ca, and

A: A 2.856-g sample of limestone was analyzed for Fe, Ca, and Mg.