Exams & Certification

what is the boiling and freezing point of water on Kelvin scale The Correct Answer and Explanation is: Answer: Explanation:The Kelvin scale, developed by Lord Kelvin, is an absolute temperature scale used primarily in scientific calculations. This scale begins at absolute zero, the point where molecular motion theoretically ceases. It aligns with the Celsius scale […]

The Hope diamond weighs 45.52 carats. If a carat equals 2.00 x 10^2 mg, what is the weight of the Hope diamond in pounds? The Correct Answer and Explanation is: Correct Answer: The weight of the Hope Diamond in pounds is approximately 0.0200 lb. Explanation (without using the word “we”): To convert the weight of

Answer the following questions for these salts: Co(OCl)2, Ba(NO3)2, and NH4Br. [a] Write an acid-base reaction for each of the salts listed above in which the salt is the product in the neutralization reaction. [b] Using the equations in part a, identify the chemicals as: strong acids (SA), strong bases (SB), weak acids (WA), and

Write the balanced molecular equation for the neutralization reaction between HI and Ba(OH)2 in aqueous solution. Include physical states. The Correct Answer and Explanation is: Balanced Molecular Equation: 2HI(aq)+Ba(OH)2(aq)→BaI2(aq)+2H2O(l)2HI(aq) + Ba(OH)_2(aq) \rightarrow BaI_2(aq) + 2H_2O(l)2HI(aq)+Ba(OH)2​(aq)→BaI2​(aq)+2H2​O(l) Explanation (300 words, without using the word “we”): The reaction between hydroiodic acid (HI) and barium hydroxide Ba(OH)2\text{Ba(OH)}_2Ba(OH)2​ represents a

Write the balanced molecular equation for the neutralization reaction between HI and Ba(OH)2 in aqueous solution. Include physical states. Molecular equation: 2HI(aq) + Ba(OH)2(aq) → BaI2(aq) + 2H2O(l) The Correct Answer and Explanation is: Balanced Molecular Equation:2HI(aq) + Ba(OH)₂(aq) → BaI₂(aq) + 2H₂O(l) Explanation: A neutralization reaction occurs when an acid reacts with a base

Aqueous solution (by mass) of urea has boiling point. The boiling point ofglucose in watar :- ‘?oint noint of water is) (1)(2)(3)(4) The Correct Answer and Explanation is: The correct answer is 373.47 K. Explanation: The boiling point elevation of a solution depends on the number of dissolved particles, which is determined by the van’t

A solution of urea in water has a boiling point of 100.128 *C. Calculate the freezing point of the same solution: Given Kb and K: for water are 0.512 ‘C/m and 1.86 “C/m respectively: Answer: T; =-0.465 % The Correct Answer and Explanation is:1 To determine the freezing point of the urea solution, begin by

+3 What is the charge on manganese (Mn) in the compound MnO2 The Correct Answer and Explanation is: The charge on manganese (Mn) in the compound manganese(IV) oxide (MnO₂) is +4. To determine the oxidation state of manganese in MnO₂, the oxidation states of oxygen must be considered first. Oxygen typically has an oxidation state

16 P 16 N Sulfur 1s² 2s² 2p? 3s² 3p? The Correct Answer and Explanation is: Sulfur has an atomic number of 16, meaning it possesses 16 protons. The number of neutrons varies based on the isotope, but the most common form, sulfur-32, contains 16 neutrons. The electron configuration is structured according to energy levels

Write the chemical formula for washing soda how may it be obtained from baking soda name and industry news of washing soda other than washing clothes The Correct Answer and Explanation is: Chemical Formula of Washing Soda:Washing soda has the chemical formula Na₂CO₃·10H₂O, which stands for sodium carbonate decahydrate. Preparation from Baking Soda:Washing soda can