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An 8.65-g sample of an unknown group 2a metal hydroxide is dissolved in 85.0 ml of water. an acid-base indicator is added and the resulting solution is titrated with 2.50 m hcl(aq) solution. the indicator changes color signaling that the equivalence point has been reached after 56.9 ml of the hydrochloric acid solution has been added.

Answer; The molar mass of metal hydroxide = 121.66 g/ mole The formula is Sr(OH)2 Explanation; M(OH)2 + 2 HCl = MCl2 + 2 H2O   Moles of the acid = 2.5 x 56.9 / 1000 = 0.14225   Therefore; moles of hydroxide at the eq point = 0.0711 moles …

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If 63.8 grams of aluminum metal (Al) react with 72.3 grams of sulfur (S) in a synthesis reaction, how many grams of the excess reactant will be left over when the reaction is complete? Be sure to write out the balanced equation for this reaction and to show all of your work.

The balanced chemical reaction would be: 16Al + 3S8 = 8Al2S3 We need to determine which reactants are the limiting and the excess. To determine this, we use the initial amounts of the reactants given above. We need to convert them into units of moles and use the balanced reaction …

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Describe two ways he could change the metal physically and two ways he could change the metal chemically to try to identify it.

Answered by answersmine AT 22/10/2019 – 03:18 AM Physical change is a change that occurs in a substance that does not change the identity of the substance. It does not alter the chemical structure of the molecules ehile chemical change involves the breaking of the bonds in the substance forming …

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You have two pieces of wire that allow electrons to pass through them when they arfe connected to each other. if you insert cable betwee the wires, electrons will flow easily. the metal cable is?

You have two pieces of wire that allow electrons to pass through them when they arfe connected to each other. if you insert cable betwee the wires, electrons will flow easily. the metal cable is?

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A recipe for candy requires that the liquid ingredients be stirred constantly until the liquid reaches a temperature of 140°C. What type of spoon – wood or metal – will prevent burns to a person’s hand while stirring the hot liquid? Explain your choice.

Sample Response: A wooden spoon will prevent the person’s hand from burning because wood is an insulator. An insulator slows the transfer of thermal energy so that very little thermal energy from the hot liquid will transfer to the person’s hand.  include: -A wooden spoon will prevent the person’s hand from …

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In order to observe a ______ property of a substance, the substance must interact with another substance , such as when gasoline burns or when sodium metal reacts with water

This problem is to apply Roult’s Law. Roult’s Law states that the vapor pressure, p, of a solution of a non-volatile solute is equal to the vapor pressure of the pure solvent, Po solv, times the mole fraction of the solvent, Xsolv p = Xsolv * Po sol X solv …

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Silver tarnishes as silver metal reacts with hydrogen sulfide, H2S, in the air. In this reaction, dark silver sulfide, Au2S, covers the surface of silver. When silver is polished, this coating of silver sulfide can be removed from the surface. This makes the silver shiny again. Enter the coefficients that balance the tarnishing reaction equation. (Type 1 for no coefficient.)Ag(s) + H2S(g) → Ag2S(s) + H2(g)

Explanation : In the net ionic equations, we are not include the spectator ions in the equations. Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides. (a) The given balanced ionic equation is, …

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How many milliliters of sodium metal, with a density of 0.97 g/mL, would be needed to produce 34.5 grams of sodium hydroxide in the single replacement reaction below? Unbalanced equation: Na + H2O —> NaOH + H2

The balanced chemical reaction is as shown below,                  N₂ + 3H₂  –> 2NH₃ The equation shows that every 3 moles of hydrogen, H2, there would be 2 moles of ammonia, NH3, that is going to be formed. Using this concept, we solve …

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A metal sample is heated and placed into the water in a calorimeter at room temperature. Which statement best describes how the calorimeter can be used to determine the specific heat capacity of the metal sample? Energy transfers to the metal from the water and calorimeter until they are all at room temperature. Energy transfers from the metal to the water and calorimeter until they are all at room temperature. Energy transfers to the metal from the water and calorimeter until they all reach a single temperature. Energy transfers from the metal to the water and calorimeter until they all reach a single temperature.

This problem is to apply Roult’s Law. Roult’s Law states that the vapor pressure, p, of a solution of a non-volatile solute is equal to the vapor pressure of the pure solvent, Po solv, times the mole fraction of the solvent, Xsolv p = Xsolv * Po sol X solv …

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Zinc and magnesium metal each reacts with hydrochloric acid to make chloride salts of the respective metals, and hydrogen gas. a 11.20-g mixture of zinc and magnesium produces 0.6854 g of hydrogen gas upon being mixed with an excess of hydrochloric acid. determine the percent magnesium by mass in the original mixture.

The balanced chemical reaction is as shown below,                  N₂ + 3H₂  –> 2NH₃ The equation shows that every 3 moles of hydrogen, H2, there would be 2 moles of ammonia, NH3, that is going to be formed. Using this concept, we solve …

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A record label surveyed 150 random visitors to its website to discover whether they prefer metal, rock, hip-hop, or jazz. The survey showed that 27 visitors preferred metal, 78 preferred rock, 21 voted for hip-hop, and 24 liked jazz. If the company estimates sales of 6,000 copies a week at its online store, how many will likely be from the rock genre? 1,040 3,000 3,120 4,200

A record label surveyed 150 random visitors to its website to discover whether they prefer metal, rock, hip-hop, or jazz. The survey showed that 27 visitors preferred metal, 78 preferred rock, 21 voted for hip-hop, and 24 liked jazz. If the company estimates sales of 6,000 copies a week at …

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Find the area of the metal sheet below that is requires to make this square – shaped traffic sign. 5x – 3.

Answer:  The correct option is (C). 10 = square root of the quantity of x minus 8 all squared plus y minus 9 all squared Step-by-step explanation:  Given that the segment AB has point A located at (8, 9). The distance from A to B is 10 units. We are …

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Elecrical wiring is commonly composed of metal covered in plastic ir rubber coating which of these materials is an insulator and which is a conductor

The equation for how temperature changes the resistance R is:  R=R₀(1+α(T-T₀)), where R₀ is the resistance at T₀=20°C, T is the temperature for which we want to calculate the resistance and α is the temperature coefficient for resistance.  The resistance of the copper wire increases by 18% or by 0.18, so the …

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A metal smith pours 3.00 kg of lead shot at 99oc into 1.00 kg of water at 25oc in an isolated container. what is the final temperature of the mixture?

The equation for how temperature changes the resistance R is:  R=R₀(1+α(T-T₀)), where R₀ is the resistance at T₀=20°C, T is the temperature for which we want to calculate the resistance and α is the temperature coefficient for resistance.  The resistance of the copper wire increases by 18% or by 0.18, so the …

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Aluminum metal reacts with iron(ii) sulfide to form aluminum sulfide and iron metal. what is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients?

Explanation : In the net ionic equations, we are not include the spectator ions in the equations. Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides. (a) The given balanced ionic equation is, …

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I PLEASE HELP! How many liters of a 2.25 molar hydrobromic acid (HBr) solution would be needed to react completely with 100.0 grams of calcium metal? Ca (s) + 2HBr (aq) CaBr2 (aq) + H2 (g)

The balanced chemical reaction is as shown below,                  N₂ + 3H₂  –> 2NH₃ The equation shows that every 3 moles of hydrogen, H2, there would be 2 moles of ammonia, NH3, that is going to be formed. Using this concept, we solve …

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Describe one chemical property of Group 1 metals that results from the atoms of each metal having only one valence electron.

The balanced chemical reaction is as shown below,                  N₂ + 3H₂  –> 2NH₃ The equation shows that every 3 moles of hydrogen, H2, there would be 2 moles of ammonia, NH3, that is going to be formed. Using this concept, we solve …

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Determine the identity of a cube of metal that measures 1.5 cm on each side and has a mass of 35.45 g

Explanation: For 1: protons plus neutrons. Atomic mass is the sum of number of neutrons and protons present in an element. Hence, the correct answer is atomic number Atomic number is defined as the number of protons or electrons present in an element. Hence, the correct answer is atomic number. …

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Three students measured the height of a lab table, each using a different meter stick. One student reported a height of 98 cm, another reported a height of 99 cm, and the last student reported a height of 70 cm. The most likely explanation for the difference in the reported heights is that one A. student improperly read the meter stick. B. meter stick was metal and the other meter stick was wood. C. student viewed the meter stick from a different angle. D. meter stick was constructed with nonstandard cm marks.

Pampas and Patagonia The Pampas are prolific South American marshes that comprise more than 750,000 km2 and combine the Argentine territories of Buenos Aires, La Pampa, Santa Fe, Entre Ríos and Cordoba. The vast fields are a common region, suspended only by the low Ventana and Tandil hills, near Bahia …

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Single-replacement reactions A. Consists of two reactants producing two products B. Involve a single product C. Occur when any metal can replace any other metal D. Are restricted to metals

The answer  the main ruleA  —– BA is the reactants  and B the products of a reactionthe number of atome of the elements of A must be equal to the number of atome of the elements of Bin our caseto balance the equationa0 KI + a1 Pb(NO3)2 → a2 PbI2 …

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Daniel is adding a metal border to a company’s lawn to stop the grass growth. The length of the lawn is 42 yards and the width is 27 yards. How much metal border will Daniel need?

Answer: Length is : Step-by-step explanation: The width of the rectangular playground is given as = x+3 The area of the playground is given as = We have to find the length. The area of the rectangle is given as : So, length can be found as : => Solving …

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What was the history of the heavy metal?

Chronological thinking is at the heart of historical reasoning.  Students should be able to distinguish between past, present, and future time.  Students should be able to identify how events take place over time.  Students should be able to use chronology in writing their own histories.  Students should be able to …

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