Calculations quiz Loading... 1. What is the relative atomic mass (Aᵣ) of a helium atom?6842Question 1 of 9 Loading... 2. To determine the formula of a metal oxide by combustion, magnesium is heated in a crucible. Why is a lid used?To stop carbon dioxide escapingTo stop the escape of magnesium oxide smokeTo stop the escape of magnesiumTo keep the magnesium warmQuestion 2 of 9 Loading... 3. How many electrons in the outer shell of group 2 elements?3210Question 3 of 9 Loading... 4. What is meant by the term molecular formula?A chemical formula that shows the simplest ratio of the numbers of atoms in a compoundA method of calculating the ratios of masses in an equationA chemical formula that shows the actual numbers of the different types of atoms in a moleculeA method of calculating the mass needed to make a certain yield in an equationQuestion 4 of 9 Loading... 5. An oxide of nitrogen contains 26% nitrogen and 74% oxygen and has a relative molecular mass of 108. Find the empirical and molecular formulae for the oxide.Empirical formula is NO₂.₅ Molecular formula is N₂O₅Empirical formula is N₂O₅. Molecular formula is also N₂O₅Empirical formula is N₄O₁₀. Molecular formula is N₂O₅Empirical formula is N₂O₅. Molecular formula is N₄O₁₀Question 5 of 9 Loading... 6. A sample of bromine contained the two isotopes in the following proportions: bromine-79 = 50.7% and bromine-81 = 49.3%. Calculate the relative atomic mass of bromine((79x50.7)+(81x49.3))/100 = 79.99(81x79)/100 = 63.99(81 + 79)/2 = 80((81x50.7)+(79x49.3))/100 = 80.01Question 6 of 9 Loading... 7. What are the three subatomic particles?Atoms, molecules and ionsChlorine, bromine, iodine+1, 0 and -1protons, neutrons and electronsQuestion 7 of 9 Loading... 8. Calculate the relative formula mass(Mr) of cobalt chloride crystals (CoCl₂.6H₂O)158238169130Question 8 of 9 Loading... 9. Tungsten has the chemical symbol W. Suggest the chemical name of WO₃.tungsten oxidateIron trioxideiron oxidetungsten oxideQuestion 9 of 9 Loading... Related Posts:The entire quiz question bank!The entire quiz question bank (Double only)!Key Calculations quizEquilibria (triple) quizCondensation Polymers quizElectrolysis quiz Hydr0Gen2020-02-16T16:38:53+00:00Categories: Uncategorized|Tags: Quiz, Topic: Calculations| Share This Story, Choose Your Platform! FacebookXRedditLinkedInTumblrPinterestVkEmail