QUESTION 7 A radioactive isotope, Z-109, has a half-life of 62.3 years. How many years (y) will it take for the sample to decay so that 35% remains of the original act Express your answer to 3 significant figures and include the unit in your answer.

Q: 4. You prepare several dilutions of an unknown compound. You measure the absorbance of each solution…

A: According to Beer-Lambert Law: where A = Absorbance, b = path length and c = concentration The…

Q: Deduce A.) 160 B. 85 C.) 25 D.) 134 the code Лимвет for CH₂ FCF

A: In 1929, Midgley and Henne created a naming system for halocarbons containing carbon, hydrogen,…

Q: The radius of a strontium atom is 215 pm. How many strontium atoms would have to be laid side by…

A: Given that Radius of strontium atom = 215 pm . Since we know that Diameter = 2 × Radius =2 × 215 pm…

Q: onstruct the expression for Kc for the llowing reaction. 2 Ag(s) + Zn*(aq) =2 Ag*(aq) + Zn(s) 1 Drag…

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Q: 6. Give a clear description of how you would separate the following mixtures: a. Sugar from water b.…

A: a) We have to separate Sugar from water  : The easiest way to separate a mixture of sugar and water…

Q: 1. Compare objects with high kinetic energy to objects with low kinetic energy. How are different? *…

A: The amount of translational kinetic energy  that an object has depends upon two variables: the mass…

Q: Use the References to access important values if needed for this question. 1A 8A H 2A 3A 4A SA 6A 7A…

A: Two species are iso electronic when they have same number of electron  thus have electronic…

Q: N SnO2 + 4Na+ + 4e- Sn+2Na₂O -> Sn+xNa* + xe− + NaxSn M

A: I will be attaching screenshots of the solutions I have derived using Mathcad software to clearly…

Q: Consider the table. ITITE Metal Tm (K) AHfus (kJ/mol) Tp (K) AHvap (kJ/mol) Li 454 2.99 1615 134.7…

A: We have given that For K ∆Hfus = 2.33 kJ/mole = 2330 J/mole                       Tm = 336 K   ∆Hvap…

Q: ** Directions Match the items in column A with those in column B. Write the letter of each correct…

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Q: Potentially Useful Information Spectrochemical Series: | < Br < SCN' < Cl° < NO3¯< F° < OH° < C2O4²¯…

A: Applying concept of co-ordination number of 16e- complexes.

Q: Use the References to access important values if needed for this question. [References] 1 pts M) 1A…

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

Q: lead + oxygen → ……………………………...……oxide

A: Lead + Oxygen → ______________________oxide

Q: COMPLETE THIS TABLE AND WRITE THEIR CHEMICAL REACTIONS   Group III Cations Confirmatory Reagent…

A: In this question, we have to find out the correct answer of given problem by the help of the…

Q: Use the following five equations to answer the following questions: i. H2O(s)⟶H2O(l) ii.…

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Q: How does this chemical reaction causes the fireworks to operate. 6KNO3 + C7H4O + 2S -------->…

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Q: II II IV V II O IV O V оооо о

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Q: tBu 111 Br NaH

A: An elimination reaction is a type of chemical reaction where several atoms either in pairs or groups…

Q: The radius of a strontium atom is 215 pm. How many strontium atoms would have to be laid side by…

A: Diameter = 2 X Radius

Q: 1A 8A H 2A 3A 4A SA 6A 7A He BC NO F Ne Li Be Na Mg 38 4B 5B 6B 78 r88 - 1B 28 Ai si P S CI Ar K Ca…

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Q: Explain the concept of analytical chemistry regarding soil pollution

A: Interpretation -  To explain the concept of analytical chemistry regarding soil pollution -…

Q: aG ӘР av ле T T

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Q: By dissolving .... ...in water, colored solutions are formed a- NiCl, and FeCl3 b- NaCl and COCI, c-…

A: Given statement is :  By dissolving ...............in water, colored solutions are frmed.  a). NiCl2…

Q: Write balanced complete ionic equation for CaS(aq) +CdCl2 (aq) → CdS(s) + CaCl (aq). Express your…

A: In net Ionic reaction no of ions should be equal in both side reactant and product

Q: A 10.61 gram sample of a certain hydrate of copper (II) sulfate, is heated until all the water is…

A: The question is best on experimental technique of determination of molecular formula of the hydrate.…

Q: Which sample has the largest volume  densitites are aluminum 2.7 g.cm-3 and copper 9.0g.cm-3 (A)…

A: Formula: Density= mass/volume Volume= mass/density Given data: density of aluminium=2.7 g/cm³ ,…

Q: Use the References to access important values if needed for this question. 1A 8A H 2A 3A 4A 6A 7A He…

A:

Q: Calculate the amount of material remaining for each of the following substances. 5.25 g Rn-222 (t ½…

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Q: in ha ion hes andand reductien potental -1.25 V. An engineer proposes using this hafeaction at the…

A: Answer

Q: Disintegrate or decay mean that radioactive elements disappear as they emit radiation and are…

A: The given statement is true

Q: what is the physical stare of Fe? physical appearance of Fe? what is the color of Fe?

A: Fe is symbol of iron. It is a transition metal. It shows two stable variable valency - ferrous…

Q: 3. +¹C 3 n + 103Lr 1. 4. 35Cl + p 17 4 20 α + 5. 235Cm + In → 96 91 + 8 n + Zr

A: Balancing a nuclear reaction involves making sure that the total number of protons and neutrons…

Q: 4. Li (s) + Cr2(SO4)3 (aq) > 5. Mg (s) + FESO (aq)> Al (s) + NISO (aq)> 6.

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Q: Part B: Observations: Oaklardium fogged up in the water. Plum Springum fogged up the water brown…

A: Rv(s) (aq) + OK (NO3)2 (aq) ----&gt;  Rv (NO3)2 (aq) + OK (s)Ionic equation -Rv(s)  + OK2+ (aq) +…

Q: The element titanium is now being used as a structuralmaterial for bone and joint replacement…

A: Titanium belongs to group four. It is solid metal at room temperature with an electronic…

Q: Where is the 2.303 coming from ?

A: To find: the purpose of the value 2.303

Q: CrO, но H,0* .CI OH CI 1. DMSO, 2. Et,Cl

A: Given reactions are oxidation reaction of primary alcohols.

Q: If pKa = 2.96 then Ka

A: Given: The value of pKa is 2.96 Ka is the acid dissociation constant

Q: The technique of mass spectrometry cannot... O be used in conjunction with an HPLC. be used in the…

A: Mass spectroscopy is an analytical technique used to measure the mass (m) to charge (z) ratio (m/z)…

Q: A chemical engineer is studying the two reactions shown in the table below. In each case, she fills…

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Q: Which statement about detecting temperature is TRUE?   Nociceptors detect small changes in…

A: Incorrect options are : 1.)    Nociceptors detect small changes in temperature.    Reason :it…

Q: Potentially Useful Information Spectrochemical Series: | < Br < SCN° < Cl` < NO3¯ < F < OH¨ <…

A: Colors of solution (visible to eye) Color (absorbed by compound) Red  Blue-green Orange  Blue…

Q: A student is given an unknown metal “M” which reacts with iron and copper, but not with magnesium.…

A: To find metal M which reacts with Fe and Cu but doesn't with Mg: