Cambridge international examinations cambridge ordinary level. It is important because if we take the molar mass of any substance, then it has 6. For example, the molecular formula of phosphorusv oxide is p4o10, whereas its empirical formula is p2o5. The mole the mole and concentration of solutions bbc bitesize. The 2nd booklet will be questions extracted from previous exam papers n5, standard. In other words, 1 mole of vo3 gains 3 moles of electrons its oxidation number would decrease by 3 units. The ideal gas law states that pv nkt, where p is the absolute pressure of a gas, v is the volume it occupies, n is the number of atoms and molecules in the gas, and t is its absolute temperature. The aim of the booklet is to help students to practise their skills in the areas of formulae, equations and simple mole equations. Heres how you would calculate the amount of grams you need.
You start with the formula from page 3 of the data booklet n cv. Understanding molarity and how to calculate it easily. Ua008883 workbook for gce students moles, formulae and equations edexcel advanced gce in chemistry 9080 edexcel advanced gce in chemistry nuffield 9086 issue 3 october 2004 1 structure of the atom the atom is composed of electrons, neutrons and protons. Solution w is sulfuric acid of unknown concentration. Data booklet scientific calculator, ruler instructions tt use black ink or ballpoint pen. You are to answer all questions in all parts of this examination according to the directions provided in the examination booklet. Some questions may require the use of the 2011 edition reference tables for physical setting chemistry. Convert all given masses of reactants or products to moles.
Pv nrt, where n is number of moles and r is the universal gas constant, r 8. Common calculations chemistry lab resources for chm 1xx. Work out the moles of the known substance using concentration molesvolume 2. Turn to the last page and fold it along the perforations.
Given enough information, one can use stoichiometry to calculate masses, moles, and percents within a chemical equation. Burn a known mass of magnesium and from this calculate the number of moles of mg. The mass, number of moles, concentration or volume of a substance can be calculated easily if you learn two formula triangles. Fill in the boxes at the top of this page with your name, t centre number and candidate number. If we know the mass or moles of one substance, we can use this to work out either the theoretical. Calculate the number of moles present in 500cm3 of nacl of. The amount of substance is measured in units of moles. So if we wanted to make 100 molecules of carbon dioxide. You have to remember the relative mass of, and the electric charge on. Give the formula of each cobaltcontaining species formed. Calculate the number of moles and the mass of the solute in each of the following solutions. Within the booklet are a range of different activities for students to work through to help them remember the content.
Number of moles of dna in 2 picogram given weight mol wt 2 x 1012 1. Working out the moles of the unknown substance using the molar ratio in the reaction equation 3. Section b answer all of the questions below in the space provided on pages 16 to 20 of this booklet. Aqa 19 gcse chemistry science quantitative chemistry. Convert between the amount of substance in moles and the number of atoms, molecules or formula units. Im in week 2 of college chemistry and i am completely lost on how to work out one of my chapter problems.
The mole is the amount of substance in grams that has the same number of particles as there are atoms in 12 grams of carbon12. Mole is the mass of the substance expressed in grams. Calculating molar concentrations from the mass of solute. Quantitative units of concentration introductory chemistry 1st. The maximum mark for this examination paper is 90 marks.
A balanced equation tells us the number of moles of each reactant. Calculate the concentration of the following solutions in mol l1. A student does an experiment to find the formula of zinc oxide. The aim of the booklet is to help students to practise their skills in the areas of formulae, equations and.
The booklet gives examples for students to work through to help build their confidence. Use that knowledge to answer all questions in this examination. The table below gives the concentration of some ions in the sample. Write given numbers of moles of each reactant or product above formula.
Information tt the total mark for this paper is 80. Work out the concentration of the unknown substance using concentration molesvolumes example. An engaging lesson presentation 80 slides and associated worksheets that uses a combination of exam questions, quick tasks and quiz competitions to help the students to assess their understanding of the topics found within topic 3 quantitative chemistry of the aqa gcse chemistry specification specification point c4. The two types of concentration used commonly are moldm3 and gdm3. Base your answer to the following question on the information below and on your knowledge of chemistry.
Jun 12, 20 ii calculate the number of moles of silver ions in the 10. Relative atomic mass is the average mass of one atom. Some questions may require the use of the 2011 edition reference tables for physical settingchemistry. Mole calculations formula mass and mole calculations. Mole and equations alevel chemistry revision notes. The constant k is called the boltzmann constant in honor of austrian physicist ludwig boltzmann 18441906 and has the value k 1. A mole is a unit to count the number of atoms, ions or molecules. Molarity, m moles solute per liter solution n moles. The mole mol is the amount of a substance that contains the same number of particles as atoms in exactly 12 grams of carbon12. Write the coefficient of each substance in equation below the formula represents moles reacted or produced 6. This number of particles atoms or molecules or ions per mole is called avogadros number and is numerically equal to 6. How do we work out the number of moles of a compound. It covers everything the students need to know about the calculations topic, including.
This is a revision booklet aimed at the new 2016 science gcse. C3 revising booklet quantitative chemistry triple higher. Physical setting chemistry wednesday, june 20, 2018 9. Centre number candidate number edexcel gce chemistry. The empirical formula of a compound is the simplest form of the ration of the atoms of different elements in it. It is the measure of the amount of substance that you have. Using moles to balance equations given masses for the following equation. Aug 06, 2016 the easiest way to calculate mass is probably through the density formula which is that density rho massvolume.
Mole fraction fraction of the substance in the mixture expressed in terms of mol is called its mol fraction x e. C3 revising booklet quantitative chemistry combined higher. The booklet gives examples for students to work through. We simply add up the mass numbers of the atoms in their formulas. Calculating a quantity in moles from a number of particles the calculation notes n the quantity in moles n the number of particles l avogadros constant, 6. A separate answer sheet for part a and part b1 has been provided to you. Explain why the total thermal energy of a sample containing 22. The ideal gas law can also be written and solved in terms of the number of moles of gas.
Number of dna molecules moles x avogadro s number 6. Molarity m is defined as the number of moles of solute divided by the number of liters. The mole concept applies to all kinds of particles. What is the concentration of a solution containing. Use the relative atomic masses listed in your data book. Calculate the concentration in moles per litre of a solution containing. Mole concept and problems solving approaches in life sciences. The gram formula mass of a substance is known as the mass of one mole. Mole concept study material for iit jee askiitians. The mass, number of moles, concentration or volume of a substance can be. Chemistry candidate session number higher level paper 2. Molarity is also the number of millimoles of solute present in exactly 1 ml of. If you have a dozen carrots, you have twelve of them.
We can find the number of moles by the division of the reference. The number of moles of hydrogen iodide formed at t seconds was a 0. The ideal gas law is generally valid at temperatures well above the boiling temperature. N5 calculations book1 chemistry teaching resources. Fill in the boxes at the top of this page with your name, centre number and candidate number. May 26, 2017 data booklet scientific calculator, ruler instructions use black ink or black ballpoint pen.
The number of moles of the reactants must equal the number of moles of the products. The following tests were carried out to identify the ions present. If you are given the amount of material you need in. Calculate the molar concentration of ethanol in an aqueous solution that contains. Formulae, equations and amounts of substance the mole is the key concept for chemical calculations definition. Your answer sheet for part a and part b1 is the last page of this examination booklet. Molar analytical concentration is the total number of moles of a solute, regardless of its. Molarity, m moles of solute per liter of solution a abc. They believed that, for example, if one molecule of carbon dioxide co 2 contained 1 carbon atom and 2 oxygen atoms, then the ratio of carbon atoms to oxygen atoms is 1. Mole calculations the mole and concentration of solutions. May 10, 2014 this is the first video in a series that will cover the amount of substance topic in the aqa alevel chemistry spec. Answer the questions in the spaces provided there may be more space than you need.
Molar mass of any elementcompound is defined as the atomicmolecular weight expressed in grams. Concentration 1 x volume 1 number of moles 1 concentration 2 x volume 2 number of moles 2. There are some sections involving multistep calculations. The concentration c of a solution is usually expressed as the number of moles n of solute dissolved in one litre of solution and the units are mollitre mol l1. Molecular formula shows all the atoms present in a molecule. Molarity m is a useful concentration unit for many applications in chemistry. Aqa gcse chemistry topic 3 revision quantitative chemistry. Proportionally we should have a lower amount of moles. Cfe higher chemistry unit three chemistry in society. How many moles and millimoles of benzoic acid mwt 122. Pearson centre number candidate number edexcel gce chemistry. Exercise 11a calculations based on concentrations in solution. Therefore, you can find the density through a search and volume through various methods such as displacement or just measuring it.
The molecular formula tells the actual number of each kind of atom in one molecule of the substance. Energy from a fuel mass x specific heat capacity x change in temperature. Moles, formulae and equations edexcel advanced gce in. The video briefly looks at the mole and then how to utilise equations to work. Learn to determine specific concentrations with several common units. Exercise 4d calculation of the number of moles of gas in a given volume of that gas 43. Number of moles of gases standard molar volume at stp 22. Formula mass since molecules are made of atoms, the relative formula mass is the sum of the masses of the atoms it is made of.
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