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Ib Chemistry Question Bank 78


11) This question is simply testing our ability to know about the acidity or basicity of sodium carbonate. Litmus paper is used to test substances of at various pHs. Red litmus paper turns blue in base, while blue litmus paper turns red in acid. If red litmus paper is added to an acid, it remains red, and if blue litmus paper is added to a base, it remains blue.




ib chemistry question bank 78



I mentioned something about this in our previous question. What kind of metals form green precipitates? Normally chromium, iron, and nickel form green precipitates. What do they have in common? Complex ions containing transition metals are usually colored, and then similar ions from non-transition metals (like sulfur) are not. What does that mean for our question? That suggests that the partly filled d-orbitals (which are characteristic of transition metals) should be involved in generating the color in some way. Answer choice C is going to be our best choice here. Nickel is a transition metal, and we said the reason for the color of the solutions is the unfilled d-orbitals. It does not have to do with charge.


We had to go back to the passage to find Equation 1, but do we need any additional information to find the equilibrium constant? We should know the equilibrium constant for a general reaction, so we should be able to apply that to Equation 1. That makes this a standalone question. What do we know about equilibrium constants for reactions?


First and foremost, we want to know about what occurred in the reaction in the question stem before we make observations about the infrared spectrum of the reaction mixture. This is as simple as knowing what occurred in this reaction. The aldehyde (our CHO) is replaced with a primary alcohol (CH2OH). The single OH group is present in both the reactants and products. Our OCH3 is also present in both the reactants and products. Our answer should include something about the aldehyde group being replaced with a primary alcohol.


38) We were told different properties of elements and bonds in the passage. This question focuses sulfur hexafluoride, and we have to describe its bonding and electrical conductivity. That means we can use the information given in the passage, likely about covalent and ionic compounds.


The difference between our alpha and beta-D-glucoronides is going to be the side on which the -OR group is found. In the compound shown here in our question stem, the C-1 -OR group is on the same side of the pyranose ring as the carboxyl group. In alpha-D-glucuronide, the C-1 -OR is on the opposite side. So, our difference comes at the C-1 carbon.


60) We had a reaction take place at 300 Kelvin, and the question is asking us to write out the net reaction. To answer this question, we need to see the figure in the passage to see what reaction actually took place.


65) In the passage we were shown reaction 1 that produced fatty acid salts. This question wants us to pick the formula that represents the general structure of the fatty acid salts produced in the reaction. We have to know the general formula of a fatty acid, and then the general formula for fatty acid salts that were produced in Reaction 1. We can use the reaction in the passage as a reference point, but the answer here is going to come from external knowledge.


(0.010 M + 0.020 M) / 2 = 0.015 M Na+(aq). You might be looking at the question stem and this calculated answer and wondering about units. To find the molar concentration, we divide the number of moles of a substance by the volume of the solution. We are already given molar concentrations, so we simply find the relative amount contributed by both. We have the proper units.


We answered an objective question here, so we can actually compare all of our answers at once here. Answer choice B is the only answer choice that contains Compound 2, and does not contain Compound 1.


78) Experiment 2 involved electrolysis cells, and we want to know what is taking place at the cathode. To answer this question, we need to know how electrolytic cells work. Electrical energy is used to drive a nonspontaneous redox reaction. The oxidation half reaction occurs at the anode, and the reduction half reaction takes place at the cathode. Electrons flow from the positive anode to negative cathode.


Look at pressure and temperature. This reaction takes place at STP, meaning 1 mole of a gas will occupy a volume of 22.4L. Pay attention to every aspect of the question and what each number could potentially mean.


93) All of the 4 molecules in the question stem look like they have similar formulas, but only one is liquid at room temperature. We have to explain why water is an outlier, while the other three are gases.


The pH at the equivalence point will be the same as the pH of the sodium benzoate and water formed. The question stem mentions that benzoic acid is a weak acid. And we know NaOH is a strong base. How do we know that?


We need to break down the compound one step at a time. Aluminum has a charge of +3. Every fluorine has a charge of -1. So, we have a central aluminum, surrounded by 6 ligands. The molecular geometry and electron geometry is going to be octahedral because of the 6 electron-dense areas according to VSEPR theory. So main takeaway here? Know your content! This question can be answered in a matter of seconds because we know VSEPR theory.


118) This question just boils down to reading the phase diagram carefully. Our phase diagram of water has two variables on its axes, pressure and temperature. As these conditions vary, so do the phases of water. The phases vary from solid, to liquid, or vapor based on the variation in pressure and temperature.


Applicants can waive the English Language Proficiency requirement if they upload transcripts to the application portal showing they successfully completed at least four full-time semesters within a four-year time frame from time of application and maintained at least a B average at a college or university in the United States or a country from an approved list. For questions regarding English Language Proficiency waivers, please email Soha Acosta.


ASU will use your ALEKS assessment score and your major math requirements to identify the appropriate math course for your math skills and academic goals. If you have any questions, please connect with your academic advisor.


Arizona State University requires an ALEKS Placement, Preparation and Learning (ALEKS PPL) Assessment to determine readiness for mathematics courses. ALEKS PPL is a web-based program that uses artificial intelligence to map a student's strengths and weaknesses. The Placement Assessment is up to 30 questions and generally takes 60-90 minutes to complete. After the Placement Assessment, an individualized Prep and Learning Module is available for students to refresh their knowledge on forgotten topics. Students then have the opportunity to reassess and improve their placement. ALEKS consists of three parts:


ALEKS PPL is an online, adaptive system that covers a broad spectrum of mathematics topics. The length of the Placement Assessment will vary, but can be up to 30 questions. You will see some, but not all, of the math you have learned in high school. It is a Placement Assessment, not a preview of math courses at Arizona State University. It is designed to identify if you are prepared for a particular course. After you take your first Placement Assessment, you will have the opportunity to review and master additional topics to reassess and improve your placement.


If you are having technical issues, such as trouble downloading the lockdown browser, pages freezing or staying frozen on one page for an extended amount of time, pages crashing, etc., please call ALEKS technical support at (800) 258-2374, or you can submit a ticket with them here: _placement. General support questions can be asked at placement.math@asu.edu


If you have questions about your placement assessment scores and the courses you should take for your degree program, contact your academic advisor in your major. Your advising contact information is located in My ASU.


NWEA's MAP Growth Test covers four main areas: reading, language use, math, and, for some grades, general sciences. The test uses a variety of question types, such as multiple choice, fill in the blank, and drag and drop answers. Each section contains between 40-53 questions. This variation is due to the test's adaptive nature, as well as the specific section the student is being tested with.


The following table presents the number of questions on each of the MAP sections: Reading, Language Usage, Math, and Science. There is a difference in the number of questions between the MAP for primary grades (K-2) and the MAP for more advanced grades (2+). The exact number of questions varies according to the student's performance on the test.


Scores for the NWEA MAP are reported using the RIT scale (Rasch unIT). The RIT scale is an equal-interval scale, like a ruler with inches. The RIT scores are stable and cover all ages, and can be used to measure progress and academic growth from year to year. A student's RIT score indicates the level of questions that he or she is expected to answer correctly about 50% of the time.Since the MAP test is taken on a computer, once the child finishes the test the scores are available. Read more about how the MAP test is scored and how to interpret your child's progress on our MAP Scores page.


TestPrep-Online offers MAP sample questions for Kindergarten, 2nd grade, 3rd grade, 4th grade, 5th grade, 6th grade, 7th grade, and 8th grade. Start practicing today!


Chemistry of Heterocyclic Compounds publishes articles, letters to the Editor, reviews, and minireviews on the synthesis, structure, reactivity, and biological activity of heterocyclic compounds including natural products. The journal covers investigations in heterocyclic chemistry taking place in scientific centers of all over the world.Chemistry of Heterocyclic Compounds is a translation of the peer-reviewed journal Khimiya Geterotsiklicheskikh Soedinenii.More information is available at the editor's website via the following link:


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