30 70 60 50 40 30 20 10 0 0 1 2 3 4 Time (Days) 6 7 8 9 How long is the half-life of the isotope shown in the graph? How many half-lives have passed after 8 days? After 6 days, what percentage of the isotope sample is left? How much of the original sample would be left after 6 half-lives? Using the isotope from the graph, determine how long it would take a sample of 600 g to decay to 75 g. If scientists determined a 4 g sample of this isotope was 20 days old, how much was in the original amount?

Q: decomposition of N2O5 to NO2 and O2 is first order with respect to the reactant N2O5 and first order…

A: Given -> Order of reaction =first order  Rate constant (k) = 6.82 × 10-3 s-1  Initial moles of…

Q: Draw the skeletal ("line") structure of 2-chloro-6-methyloctane.

A: Given is, 2-chloro-6-methyl Octane  Asking is , skeletal or line structure of Given molecule?

Q: The following question refers to a 2.0-liter buffered solution created from 0.31 M NH3 (Kb = 1.8…

A:

Q: A certain substance X melts at a temperature of -3.3 °C. But if a 350. g sample of X is prepared…

A:

Q: Consider 2.00 L of an ideal gas in a sealed container (no gas particles can enter or leave) at 20.0…

A:

Q: A bomb calorimetry experiment was performed on a sample of the liquid. A 1.1537 g sample of…

A:

Q: Balance/complete (2+1 marks each) the following chemical equations, and identify the type of…

A:

Q: How much energy is evolved during the formation of 4.5 moles of Fe, according to the reaction below?…

A:

Q: Question #: 7 What is the change in heat when 0.327 g of carbon reacts with oxygen to form carbon…

A:

Q: signment/takeCovalentActivity.do...@ %D0 [Review Topica] [References] Use the References to access…

A:

Q: Calculating the pH of a weak acid solution The acid dissociation constant K of boric acid (H₂BO3) is…

A: “Since you have asked multiple question, i will solve the first question for you. If you want any…

Q: Calculate the pH of a solution that contains the following analytical concentrations: a. 0.0400 M in…

A: (a) 0.0400 M NaH2PO4 ka1 = 7.11 x 10-3  ka2 = 6.32 x 10-8    (b) 0.0300 M NaH2AsO4 0.0500 M Na2HAsO4…

Q: Calculate the pH of a solution containing a mixture of 0.20 M HCl and 0.20 M HClO2 (Ka (HClO2) = 1.2…

A: pH is defined as the negative logarithm of H+ ion concentration.  pH = - log [H+]

Q: 8. Quantum-mechanical oscillator. Describe Figure 2.: (a) Describe what is plotted on the x-axis and…

A: The system shown above is simple harmonic oscillator, here we calculate the quantised energy by…

Q: How many moles of water are there in 1.0 L at standard pressure and temperature? How many molecules…

A: Given -> Volume (V) = 1.0 L Standard temperature= 0°C = 273K  Standard pressure= 1 atm

Q: 2) For each of the following pairs of compounds, name one absorption band that can be used to…

A:

Q: Mercury and oxygen react to form mercury(II) oxide, like this: 2 Hg()+O₂(g)-2 HgO(s) At a certain…

A: According to the question, The reaction is as follows, 2Hgl + O2g → 2HgOs The mass of all species…

Q: be An unknown gas at 67.1 °C and 1.10 atm has a molar mass of 44.10 g/mol. Assuming ideal behavior,…

A:

Q: The decomposition of N2O5 to NO2 and O2 is first order with respect to the reactant N2O5 and first…

A: It is given that the decomposition of N2O5 to NO2 and O2 is first order with respect to the reactant…

Q: Calculate the amount of heat needed to melt 127. g of solid acetic acid (HCH3CO₂) and bring it to a…

A: Mass of acetic acid = 127 g Number of moles = Mass /Molar mass  Molar mass of acetic acid =…

Q: What is the pH of a solution of 0.100M HCN mixed with 0.150M NaCN?  Assume the total volume is…

A: Given :-  Concentration of HCN = 0.100M  Concentration of NaCN = 0.150 M are mixed and volume get…

Q: What is the pH of a 0.258M solution of NaIO3?   (i am needing correct significant digits for my…

A: the pH of a 0.258M solution of NaIO3 is 7.09

Q: What is the predicted product of the reaction shown? بلے میں o O O O CI CI ||| gove ol IV

A: Acid chloride reacts with sodium salt of a carboxylic acid to form acetic anhydride and sodium…

Q: Determine the pOH of each solution. (a) [H3O+] = 1.2 × 10-8 M (b) [H3O+] = 5.5 × 10-² M (c) [H3O+] =…

A: pH is equal to negative logarithmic of hydrogen ion concentration

Q: Which of the following unit cells represents body-centered cubic packing? (A) (B) (A) (B) (C) none…

A: In body centered cubic packing, the atoms are present at all the 8 corners of the cube and one atom…

Q: The enthalpy of combustion of benzoic acid (C6H5COOH) is commonly used as the standard for…

A:

Q: ОН ОН Draw the molecule on the canvas by choosing buttons from the Tools (for bonds and charges),…

A: Pinacol-pinacolone rearrangement: 1,2-diols in the presence of acid gives a carbocation, then…

Q: For the reaction 2H₂S(g) = 2H₂(g) + S₂(g), K₂8.9x10² at 725 K. What will happen when 0.20 mol of…

A: The reaction quotient for the given reaction is Q =[H2]2 [S2][H2S]2. According to Le chateliar's…

Q: Draw the major product of the aldol addition reaction between two of these ketones with the…

A: In this question, we have to draw the major product of the aldol addition reaction of the given…

Q: The salt NaCl which 100% dissociates is... O a. neutral O b. acidic O c. basic O d. not enough…

A: An acidic solution has higher concentration of hydrogen ions (H+) than hydroxide ions (OH-). An…

Q: Gaseous ethane (CH,CH,) reacts with gaseous oxygen gas (0₂) to produce gaseous carbon dioxide (CO,)…

A:

Q: A gas mixture contains 8.00 g of Ne gas, 9.50 g of Cl2 gas, and 5.35 g of CO gas. If the total…

A:

Q: 4. What weight of KCI and H₂O are needed to make 520 g. of 15 % solution.

A:

Q: Predicting the qualitative acid-base properties of salts Consider the following data on some weak…

A:

Q: Given the following atoms: A) CI Answer the following: Largest radius [Select] Lowest first…

A: The chemical elements are arranged in rows and columns on what is known as the periodic table, or…

Q: مراد الله 3/2 Sho он OH ok (all c from the orig) => x= Please show the synthesis for the two above…

A:

Q: if you have the dissolution of Mg(NO3)2 will adding the following cause the salt to dissolve or…

A: A question based on solutions. A salt Mg(NO3)2 is prescribed for which the dissolution or…

Q: Consider the hypothetical reaction A+B+ 2C 2D + 3E where the rate law is Rate = - Δ[Α] At =k[A][B]²…

A:

Q: Consider the reaction: 2Al(s) + 6HCl(aq) → 2AICI3(aq) + 3H₂(g) If a sample of 4.0 moles of Al is…

A:

Q: Write the systematic name of each organic molecule: structure CI C name 0 0 X 5

A:

Q: The rate of a certain reaction is given by the following rate law: rate=k [N₂] ³ [03] Use this…

A:

Q: Draw a Lewis Structure and determine the (theoretical) smallest F-S-F bond angle in SF4-

A:

Q: 16. Which of the following is the most reactive to nucleophilic addition reaction? A. B. OCH 0₂N H…

A: A nucleophilic addition reaction is a chemical addition reaction in which a nucleophile forms a…

Q: Nitric acid is added to a sample of zinc. Based on the following information, what is the…

A: Initial mass of Zn = 9.50 g Final mass of Zn = 3.23 g  Mass of Zn reacted = 9.50 - 3.23  = 6.27 g

Q: Propose a suitable synthetic route to carry out the following transformations

A: The above reaction is the conversion of carbonyl group into -CH2 which can be done by reduction.

Q: The activation energy (E) for the reaction 2N₂O(g) 2N₂(g) + O₂(g) ΔΗ is 240.0 kJ mol kJ mol 0x10 -…

A:

Q: Write the systematic name of each organic molecule: structure CH₂ CH₂-CH₂-CH₂-CH-CH-CH-CH₂ 8-3 CH₂…

A:

Q: Interconverting Ka and pka Complete the following table, which lists information about the measured…

A: There are several theories to define acid and Base.  Here we are required to complete the table to…

Q: The following reaction is exothermic in the forward direction Ni (s) + 4 CO (g) → Ni(CO)4 (g) In…

A: Given that, a reaction is Ni (s) + 4CO (g) ↔ Ni(CO)4 (g). The given reaction is an exothermic…

Q: What is the pH of a solution made by mixing 0.500M C5H5N and 0.450M C5H5NHCl? for its answer, I am…

A: