Study guides, Class notes & Summaries

0 1 This question is about the periodic table. In the 19th century, some scientists tried to classify the elements by arranging them in order of their atomic weights. Figure 1 shows the periodic table Mendeleev produced in 1869. His periodic table was more widely accepted than previous versions . 1 The atomic weight of tellurium (Te) is 128 and that of iodine (I) is 127 Why did Mendeleev reverse the order of these two elements?

0 1 This question is about the periodic table. In the 19th century, some scientists tried to classify the elements by arranging them in order of their atomic weights. Figure 1 shows the periodic table Mendeleev produced in 1869. His periodic table was more widely accepted than previous versions . 1 The atomic weight of tellurium (Te) is 128 and that of iodine (I) is 127 Why did Mendeleev reverse the order of these two elements? . 2 Mendeleev left spaces marked with an asterisk * He left...

Question Answers Extra information Mark AO / Spec. Ref 01.1 any one from: • so elements / iodine / tellurium were in groups with similar properties • iodine has similar properties to Br / Cl / F / Group 7 • iodine has different properties to Se / S / O / Group 6 ignore reference to atomic structure ignore references to Cr, Mn and Mo allow corresponding argument in terms of tellurium 1 AO1 4.1.2.2 01.2 Mendeleev had predicted properties of missing elements ...

Question Answers Extra information Mark AO / Spec. Ref 01.1 any one from: • so elements / iodine / tellurium were in groups with similar properties • iodine has similar properties to Br / Cl / F / Group 7 • iodine has different properties to Se / S / O / Group 6 ignore reference to atomic structure ignore references to Cr, Mn and Mo allow corresponding argument in terms of tellurium 1 AO1 4.1.2.2 01.2 Mendeleev had predicted properties of missing elements element...

1 Soluble salts are formed by reacting metal oxides with acids. box 0 1 . 1 Give one other type of substance that can react with an acid to form a soluble salt. [1 mark] 0 1 . 2 Calcium nitrate contains the ions Ca2+ and NO3 – Give the formula of calcium nitrate. [1 mark] 0 1 . 3 Describe a method to make pure, dry crystals of magnesium sulfate from a metal oxide and a dilute acid. 0 2 This question is about metals and metal compounds. box 0 2 . 1 Iron pyrites is an ionic compound....

GCSE CHEMISTRYHigher Tier Paper 1 1 Soluble salts are formed by reacting metal oxides with acids. box 0 1 . 1 Give one other type of substance that can react with an acid to form a soluble salt. [1 mark] 0 1 . 2 Calcium nitrate contains the ions Ca2+ and NO3–Give the formula of calcium nitrate.[1 mark] 0 1 . 3 Describe a method to make pure, dry crystals of magnesium sulfate from a metal oxide and a dilute acid. 0 2 This question is about metals and metal compounds. box 0 2 . 1 Iron pyr...

GCSE CHEMISTRY (8462) with complete solution

GCSE CHEMISTRY (8462)AQA-8462-SP-2016

GCSE CHEMISTRY 8462/1H PAPER 1 MARKING SCHEME JUNE 2023 ................................. Question Answers 01.1 a ball of positive charge with (negative) electrons embedded