9.1. Properties of metals
A subsection of Chemistry, 0620, through 9. Metals
Listing 10 of 101 questions
Samarium is a metal. Deduce the number of electrons and neutrons in the samarium atom shown. 154Sm number of electrons number of neutrons  Samarium has properties that are similar to the properties of transition elements. Choose one statement about samarium that is correct. Tick (✓) one box. Compounds of samarium are colourless. Samarium has a low melting point. Samarium and its compounds do not act as catalysts. Samarium has a high density.  Large pieces of samarium react with cold water to produce hydrogen gas. 2Sm + 6H2O → 2Sm(OH)3 + 3H2 Complete by drawing the apparatus to show how the volume of hydrogen gas is measured during this reaction. cold water large pieces of samarium  The experiment is repeated using hot water instead of cold water. All other conditions stay the same. Describe how the rate of reaction changes when hot water is used. The experiment is repeated using powdered samarium instead of large pieces of samarium. All other conditions stay the same. Describe how the rate of reaction changes when powdered samarium is used. Table 5.1 shows the observations when samarium and three other metals are heated in oxygen. Table 5.1 metal observations nickel reacts very slowly samarium reacts rapidly strontium reacts very rapidly yttrium does not react Put the four metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive  Samarium reacts with oxygen to produce samarium oxide, Sm2O3. Complete the symbol equation for this reaction. Sm + 3O2 → Sm2O3 Hydrated samarium chloride is an ionic compound. Define the term hydrated. State two physical properties of an ionic compound.  
0620_m24_qp_32
THEORY
2024
Paper 3, Variant 2
View
Water is a simple covalent compound. Complete the diagram to show the electrons in the covalent bonds in a water molecule. O H H Give two physical properties which distinguish a simple covalent compound from an ionic compound. Some information about the reaction of four metals with water is given. cerium: reacts slowly with cold water iron: reacts with steam only when extremely hot lithium: reacts rapidly with cold water magnesium: reacts slowly with hot water List these metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive State the conditions needed for iron to rust. State two methods of rust prevention. Starting with an aqueous solution of copper(sulfate, describe how you could obtain a pure dry sample of copper(sulfate crystals. Carbon dioxide and water are formed when hydrocarbons burn. Complete the chemical equation for the combustion of butene. C4H8 + 6O2 CO2 + H2O
0620_s17_qp_33
THEORY
2017
Paper 3, Variant 3
View
Questions Discovered
101