igcse question explain why the metal calcium importers

International GCSE Chemistry - Edexcel

21.05.2012· (a) Explain why silicon dioxide reacts with calcium oxide. (2).. (b) Part of the structure of silicon dioxide is shown in the diagram. (i) What does particle A represent? Give a reason for your answer. (2).. (ii) Explain, in terms of its bonding and structure, why silicon dioxide has a very high melting point. (4)

IGCSE Geography Revision Question Bank

26.01.2021· For an area which you have studied, explain why the rate of natural population growth is high. Link Overpopulation occurs when there are too many people living in an area for the resources which are available.

ENVIRONMENTAL MANAGEMENT 0680/22

6 UCLES 2020 0680/22/F/M/20 (c) Calcium is an important mineral needed for growth. A student investigated how calcium affects the growth of giant land snails. One group of giant land snails were fed leaves only (diet A). A second group of giant land snails were fed leaves with calcium added (diet B). The student measured the shell length of each giant land snail at four-week …

C hem gu id e – an sw ers METALLIC BONDING

C hem gu id e – an sw ers METALLIC BONDING 1. a) K: 1s2 2s2 2p6 3s2 3p6 4s1 Ca: 1s 2 2s2 2p6 3s 3p6 4s2 Sc: 1s 2 2s 2p6 3s2 3p6 3d1 4s2 b) In solid potassium, the 4s1 electrons from all the potassium atoms overlap to form a huge system of delocalised molecular orbitals which extend over the whole piece of metal.

FACTFILE: GCSE CHEMISTRY: UNIT 2

FACTFILE:˜˚˛˝˜˙ˆˇ˘ GCSE fiflfi CHEMISTRY : UNIT 2.1˙ˆˇ˘ fifi fifi˜˚˛˝˙ˆˇ˛ˆ˘˚ˇ 6 By using experimental data it is possible to place metals in a reactivity series. A tick 3 represents a reaction and an 7 represents no reaction. Metal X Metal Y Metal Z X sulfate 7 7 Y sulfate 3 3 Z sulfate 3 7 Metal X displaces both Y and Z – so it must be the most reactive and be at

Chemistry Unit 1 Resit Past Paper …

Explain why the boiling point of Y is lower than that of X. [2 marks] The straight chain molecule has a larger surface area to volume ratio and so has stronger Van der Waals forces between molecules. January 2013 - State the type of cracking that produces a …

International GCSE Chemistry - Edexcel

21.05.2012· 4 *P40134A0428* Answer ALL questions. 1 A student was asked to find the mass of salt dissolved in 100 cm3 of sea water. She was given the following instructions. Step A Weigh an empty evaporating basin Step B Transfer 50 cm3 of sea water into the basin Step C Heat the sea water in the basin until all the water has evaporated Step D Allow the basin and residue to …

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02.05.2019· (b) Explain why metals are good conductors of electricity and suggest why this conductivity increases across the periodic table from sodium to …

Ionic Bonding Exam Questions With …

Example GCSE Questions. All the questions on this page have featured in previous GCSE level exams at one point or another and this is a key topic - it will be in the exam. So check your answers against the markschemes and learn them! Remeer foundation tier questions can also appear in the higher tier paper.

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Previous Year Questions - Metals and Non …

Q.8. (a) When calcium metal is added to water, the gas evolved does not ch fire but the same gas evolved on adding potassium metal to water ches fire. Explain why? (b) Name a metal for each case : (i) It displaces hydrogen gas from nitric …

GCSE CHEMISTRY - The Structure of Metals …

Atomic Structure. What is Metallic Bonding?. What is the Structure of a Metal?. Metals form a giant structure (like ionic compounds and giant molecules).. In the picture below the red balls represent metal ions. The blue lines represent delocalised electrons in the outer shell of the metal ions.Delocalised means that the electrons are not attached to one particular ion.

Metals - ------ GCE Study Buddy ------ The …

Providing study notes, tips, and practice questions for students preparing for their O level or upper secondary examinations. You can find notes and exam questions for Additional math, Elementary math, Physics, Biology and Chemistry. Tips and notes for English, General Paper, and composition writing are also provided.

Reactions between Metals and Acids …

Acid + Metal Salt + Hydrogen (NB: note that the word ''salt'' here refers to a metal salt, i.e. a compound of the metal which has been formed through reaction with an acid, e.g. zinc chloride, potassium nitrate and iron sulfate are all metal salts). Example: Here are two examples of reactions of different metals with dilute acids:

2:39 describe an experiment to prepare a …

2:26 (Triple only) know that an alloy is a mixture of a metal and one or more elements, usually other metals or carbon; 2:27 (Triple only) explain why alloys are harder than pure metals (f) Acids, alkalis and titrations. 2:28 describe the use of litmus, phenolphthalein and methyl orange to distinguish between acidic and alkaline solutions

C hem gu id e – an sw ers METALLIC BONDING

C hem gu id e – an sw ers METALLIC BONDING 1. a) K: 1s2 2s2 2p6 3s2 3p6 4s1 Ca: 1s 2 2s2 2p6 3s 3p6 4s2 Sc: 1s 2 2s 2p6 3s2 3p6 3d1 4s2 b) In solid potassium, the 4s1 electrons from all the potassium atoms overlap to form a huge system of delocalised molecular orbitals which extend over the whole piece of metal.

Level 1/Level 2 GCSE (9 - 1) Chemistry - Revision Science

14.06.2018· 3 Lithium, sodium and potassium are reactive metals in group 1 of the periodic table. (a) Sodium metal tarnishes in air to form a layer of sodium oxide on its surface. 0.92 g of sodium coined with 0.32 g of oxygen in this oxide. Calculate the empirical formula of this sodium oxide. (relative atomic masses: O = 16, Na = 23) You must show your

11 0620 31 2RP - Papers | XtremePapers

(ii) Calcium oxide reacts with silicon(IV) oxide, an acidic impurity in the iron ore, to form slag. Write an equation for this reaction.. [2] (iii) Explain why the molten iron and the molten slag form two layers and why molten iron is the lower layer.. [2] (iv) Suggest why the molten iron does not react with the air.

Ionic Bonding Exam Questions With …

Click to reveal the correct answer. The compound''s name is magnesium oxide. When naming an ionic compound the name of the metal comes first, followed by the non-metal. The non-metal''s name ending is changed to -ide, i.e. oxygen becomes oxide, sulfur becomes sulfide, etc.

0620 w11 qp_31 - SlideShare

11.03.2014· 0620 w11 qp_31. 1. READ THESE INSTRUCTIONS FIRST Write your Centre nuer, candidate nuer and name on all the work you hand in. Write in dark blue or black pen. You may use a pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES.

06 0620 42 3RP - Past Papers

7 (a)Displacement reactions occur between metals and metal ions. Displacement reactions can be used to determine the order of reactivity of metals such as lead (Pb), nickel (Ni), and silver (Ag). The ionic equation for a displacement reaction is shown. Ni(s) + Pb2+(aq) Pb(s) + Ni2+(aq) The ionic half-equations for this reaction are shown.

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02.05.2019· (b) Explain why metals are good conductors of electricity and suggest why this conductivity increases across the periodic table from sodium to …

IGCSE Geography Revision Question Bank

26.01.2021· Explain why many people continue to live in areas at risk from natural hazards. Link; Explain how volcanoes are formed at destructive plate boundaries. You may use a labelled diagram in your answer. Link; Long-term effects may occur in the weeks or months after a large earthquake. Explain why these long-term effects might be difficult to deal with.

Caridge International Examinations Caridge

3 Calcium reacts with nitrogen to form the ionic compound calcium nitride, Ca 3 N 2. (a) Draw a diagram, based on the correct formula, which shows the charges on the ions and the arrangement of the electrons around the negative ion. Use o to represent an electron from a calcium atom. Use x to represent an electron from a nitrogen atom. [3]

0620 s06 qp_3 - SlideShare

11.02.2014· 0620 s06 qp_3. 1. Name ap eP m e tr .X w Candidate Nuer w w Centre Nuer 0620/03 CHEMISTRY Paper 3 May/June 2006 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required.

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Higher Tier Paper 3: Chemistry 1H - AQA

• When answering questions 03.4, 05.2 and 06.3 you need to make sure that your answer: ‒ is clear, logical, sensibly structured ‒ fully meets the requirements of the question ‒ shows that each separate point or step supports the overall answer. Advice • In all calculations, show clearly how you work out your answer.

06 0971 31 FP - GCE Guide

calcium carbonate. All other conditions are kept the same. The sizes of the pieces of calcium carbonate are: powder small pieces large pieces. Complete the table by writing the sizes of the pieces of calcium carbonate in the first column. size of pieces of calcium carbonate initial rate of loss in mass in g / s 0.005 0.030 0.100 [1] [Total: 7]