Chemistry Homework Assistance

QuestionAI's chemistry problem solver is a middle school chemistry tutoring tool that summarises key chemical reactions and equations in real-time, featuring a robust learning system to empower even those with a weak foundation in chemistry.

You needn't fret over the elemental properties of the periodic table anymore. Here, you can effortlessly access chemical reactions and reaction principles corresponding to each element. Deductive reasoning from microscopic phenomena to discern the original structure of molecules and atoms is a research technique we staunchly champion.

4. There is water inside your water bottle identify the solid. __

6 This question is about cycloalkenes. Cycloalkenes are ring-shaped hydrocarbon molecules containing a double carbon-carbon bond. Cycloalkenes react in a similar way to alkenes. Describe a test for the double carbon-carbon bond in cycloalkene molecule Give the result of the test. __ fairness __ __

Answer at least two questions from this section.See page 1 for full instructions. 1. To determine the concentration of ethanoic acid in a sample of vinegar, 25.0cm^3 of the vinegar were diluted to 250cm^3 and then the diluted vinegar was titrated with a previously standardised solution which contained 1.20 g of sodium hydroxide in 500cm^3 of solution. On average, 18.75cm^3 of the diluted vinegar were required to neutralise 25.0cm^3 of this sodium hydroxide solution. The equation for the titration reaction is: (a) Describe in detail the procedures involved in measuring a 25.0cm^3 sample of the vinegar and diluting it using deionised water to exactly 250cm^3 (15) (b) Name a suitable indicator for this titration.- Phenolohthal ein What colour change is observed at the end point? pink to clear (c) Calculate (i) the number of moles of sodium hydroxide in each 25.0cm^3 portion, (ii) the number of moles of ethanoic acid per cm^3 of diluted vinegar. (d) Find the concentration of ethanoic acid in the original vinegar (i) in terms of moles per litre, (ii) as a percentage (w/v) (e) Starting with a primary standard solution made from anhydrous sodium carbonate, what two titrations are required to standardise a sodium hydroxide solution? (9) (12 c

A if I so B C 3. I f fo-" a) What non-renewable resource is a mixture of hydrocarbons? Enteranswer b) Which of these molecules could be found in this resource? Select all correct answers A B C D

1. The element phosphorus (P, Group 5A) is located to the right of the element magne member in the same period in the periodic table. Which statement is TRUE? A. Magnesium has a larger atomic number. B. Phosphorus has a larger atomic mass but has the same number of Energy levels. C. Magnesium &phosphorus have the same number of valence electrons. D. Magnesium &phosphorus are isotopes. 2. Elements in group 2A are all called alkaline earth metals.. What is most similar a metals? A. How many protons and neutrons do they have? B. How many valence electrons do they have? C. How many total electrons do they have? D. Which period are they most often found in? his is how zirconium appears in the periodic table. Rounded the average atomic mass to the nearest whole numb number/atomic mass, how many electrons are in an atom of A. 40 B. 51