chemistry questions and answers

All rights reserved. a. (pKa of HA = 5.0). On adding a concentrated solution of potassium hydroxide, the volume further diminished to 15 ml of the residual gas being pure oxygen. Download the past questions now Current Affairs. What are isotopes and how do they relate to atomic number and mass number? A coolant widely used in automotive engines is 38.70% carbon, 9.75% hydrogen, and 51.56% oxygen. 22) A compound was found to contain nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. Before entering the furnace, the air is preheated from 32 o F to 575 o F. At what rate (Btu/h) must heat be transferred to the air if the feed rate of p... Why are intermolecular forces generally much weaker than bonding forces? What is the concentration of hydronium ions in the solution? You conduct an experiment that requires the creation of an ammonia solution. If 93 J of heat are added to a pure gold coin with a mass of 12 g, what is its temperature change? (The half life of radium-226 is 1.6 \times 10^3 years). Answer: 10 electrons. If you check the last 2 year’s papers of SSC CGL any other competitive exams, you will find that many questions from Science & Technology are asked. How many water molecules can hydrogen bond to methanol? Based on the empirical formula, oxygen is what percent of this compound? 44) Which material is used in display devices, such as digital watches? 42) M is the molecular weight of KMnO4. The relationship between the coefficients of the components of a balanced chemical is referred to as the: a) tracheotomy b) symmetry c) stoichiometry d) numerology e ) cosmology. Chemistry Part 1 Online Quiz - Following quiz provides Multiple Choice Questions (MCQs) related to Chemistry. Using a single reagent, how could you distinguish between the following pairs of substances contained in separate test tubes? (b) Give one or more examples of how chemistry has affected another science. Study the information in the table below and answer the questions that follow: Elemen t Atomic radius (nm) Ionic radius (nm) W 0.114 0.195 X 0.072 0.136 Y 0.133 0.216 Z 0.099 0.181 (a)Would these … What is the percentage of sodium oxide and potassium oxide in feldspar? Organic Chemistry Interview Questions & Answers Organic chemistry involves a scientific approach to structure, applications of the organic molecules and compounds. Which of the following samples contains more molecules? Define the term chemistry and state the main branches of this subject. All volumes have been reduced to N.T.P. Write a balanced equation showing how this can occur. Here you can learn chemistry general knowledge with collection of 150 important chemistry based gk questions. What is accuracy, precision, and specificity in relation to analytical chemistry? Sodium reacts with oxygen to form sodium oxide and has the following balanced chemical equation: 4 N a + O 2 2 N a 2 O . MnO_4^1 (aq) + 8H^{1+} (aq) + 5e^1, Write a net equation for the spontaneous redox reaction. Calculate the calories needed to raise the temperature of 20.0 g of ice to water, from 0.00 C to 55 C. For water, the heat of fusion is 79.7 cal/g, the heat of vaporization is 510. cal/g, and... Molecular masses can be determined through electroplating. Answer: Azimuthal quantum number. Chapter 02. Which one is it? d. Since fire was discovered. What is the hydronium ion concentration of a solution with a pH of 0.17? Chemistry is called the "central science" because [{Blank}]. Write the chemical equations for an atom of I-138 undergoing beta- decay and producing a beta particle. Write a net equation for the spontaneous redox reaction. Give the chemical equation for this reaction. The rate law for a reaction involving only A and B is 1st order in A and 4th order in B, respectively. Give some examples. (a) 2.16 g (b) 2.48 g (c) 2.32 g (d) 2.64 g When 36.0 grams of H2O reacts in the following reaction, how many grams of NH3 are produced? One of these postulates turned out to be not entirely correct. Find helpful Chemistry questions and answers on Chegg.com. 5 at 298 K. Calculate the hydrolysis constant of ammonium chloride and pH of 0.04 M ammonium chloride solution. How it works with aniline as example? How is chemistry connected to everyday life? 67) Where lies the biggest deposit of gold? What is the hydroxide ion concentration of this solution? How will we know when we reach the endpoint of the titration? Which situation would help speed up a chemical reaction? If you have thoroughly studied Chemistry till the 10th standard, you can observe a notable difference in the chapters. Why do you think it is important to have a basic understanding of chemistry in your study of Anatomy and Physiology and in turn, your study of Exercise Science? Extraction and Uses of Metals. Answer: D. 20) Which element can easily form chains? Answer: 4.14 g. 15) What kind of thermometer is used to determine the depression of freezing point? A. trigonal pyramidal B. trigonal planar C. linear D. tetrahedral, Chemistry studies all of the following except: A. relations in groups B. properties of a substance C. composition and structure of a substance D. reactions of a substance. Write a net equation for the spontaneous redox reaction. The HCO3- ion is an effective buffer in both acidic and basic solutions. a) 1.92 x 105 atm b) 17.2 atm c) 0.333 atm d) 253 atm e) 2.53 atm, Write the chemical formulas for the products of the following neutralization reaction: HBr + Mg(OH)2. Chapter 03. What products are formed when an acid reacts with a base? When heating, why should you heat the evaporating dish gently and intermittently? What standard are we using in this week's experiment? 1.00 g of this compound was dissolved in water to form a 100.0 mL solution. What are some quotes about socialism in An Inspector Calls? c. Since the atom was discovered. 52) Which drug is present in cola drinks? How many moles of F e S O 4 ( N H 4 ) 2 S O 4 6 H 2 O are in 2.45 g? Answer: Stirring of molten metal with green wood. You are here: Home 1 / Latest Articles 2 / Science & Education 3 / Top 22 Chemistry Interview Questions & Answers. Give two examples of how chemistry is applied to our everyday lives. Try our fun chemistry quiz and see what you really know about topics such as organic chemistry, atoms, reactions, acids and bases. While studying for this quiz, you realize that you still have 50 g of lukewarm coffee at 40 degrees C left in a paper cup. Write a net equation for the spontaneous redox reaction. Answer: D. 63) Which elements impact corrosion resistance to steel? Mention the ten (10) applications of Kohlrausch's law of independent ionic mobility. Top Ten Questions: Chemistry. You will read the same thing but can expect to find new concepts and scientific facts. If 38.5 mL of lead (II) nitrate solution reacts completely with excess sodium iodide to yield 0.0628 g of precipitate, what is the molarity of lead (II) in the original solution? Acids have a pH level below 7. The initial state of this air is 38 psia and 64F. ... 02 Atoms, Isotopes and Nuclear Chemistry . Which method will be the most helpful? Calculate molarity of the solution containing 14 g of KOH (MW = 56,1 g/mol) in 100 mL of the solution. 60) Which element in the radioactive form is used for determining the age of artifacts, relics, bones, etc. This A Level Chemistry revision page provides access to all the A Level Chemistry past papers for AQA, OCR and Edexcel as well as worksheets. Answer: Same mass number but a different atomic number. When measuring the unknown sample, is it necessary to take exactly 0.5 g of the compound? 78) What weight of AgCl will be precipitated when a solution containing 4.77 g … How many grams of lead (II) nitrate must be dissolved in 1.00 L of water to produce a solution that is 0.300 M? All other trademarks and copyrights are the property of their respective owners. 1) When a beam of white rays is dispersed by a prism which colour will be refracted to a larger extent? Each guest is served one large slice of chocolate cake, a hamburger, French fries, and some oranges. How much work, in Btu, must be tra... What is the molarity of glacial acetic acid? Chemistry Questions and Answers Test your understanding with practice problems and step-by-step solutions. 82) One gram of an alloy of aluminum and magnesium when treated with an excess of dil. Explain how you know and what this means. A. enzyme B. nucleus C. isotope D. compound. Chemistry Past Questions Exam Type: All JAMB WAEC NECO Others Exam year: All 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 … If a graduated cylinder wasn't correctly calibrated, how would it affect the results of a measurement? Give the net ionic equation for each test. 94) In the analysis of 0.500 g sample of feldspar, a mixture of chlorides of sodium and potassium is obtained which weighs 0.1180g. The formula of the compound is When is the absorption spectrum of an electron generated? There is a 1:1 molar ratio between MgF2 and Mg2+, but there is a 1:2 molar ratio between MF2 and F-. 100) Which catalyst used in the manufacture of Sulfuric acid? A solution of perchloric acid has a concentration of 3.13 x 10-4 mol/L.