copper mixtures‚ which have 11 groups. Determining the volume of the zinc and copper mixtures each‚ and record the data. Using equation get the density of the pennies. Compare the results. Find the best-fit straight line. Material: 0%Cu—100%Cu 0%Zn—100% Zn 5‚ 10‚ 20‚ and 30 pre 1982 pennies. 5‚ 10‚ 20‚ and 30 post 1982 pennies. Graduated Cylinder Procedure: Weight the mass of the different percentages of zinc and copper mixtures. Determining the volume of the different percentages of zinc
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8.4 Water 8.4.1 Water is distributed on Earth as a solid‚ liquid and gas y y y Define the terms solute‚ solvent and solution Solution a homogeneous mixture of two or more substances Solute a substance that is dissolved in another substance or the component of a solution present in a lower amount. Solvent a substance which can dissolve another substance or the component of a solution present in a greater amount. Identify the importance of water as a solvent Water is essential as a reactant
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Electrochemistry is a branch of chemistry that studies chemical reactions which take place in a solution at the interface of an electron conductor (a metal or a semiconductor) and an ionic conductor (the electrolyte)‚ and which involve electron transfer between the electrode and the electrolyte or species in solution. If a chemical reaction is driven by an external applied voltage‚ as in electrolysis‚ or if a voltage is created by a chemical reaction as in a battery‚ it is an electrochemical reaction
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PUTTING IT TOGETHER: Classifying Chemical Reactions Purpose: To observe and differentiate between the four different types of chemical reactions. Variables: The independent variables are the sodium chloride‚ sodium carbonate‚ magnesium‚copper‚ copper (11) sulfate‚ silver nitrate‚ oxygen‚ lead(11) nitrate‚ sodium carbonate‚ copper (11) sulfate pentahydrate. The dependent variables are the chemical reactions that are being looked for. For example decomposition‚ synthesis‚ single displacement or double
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placed into a solution of its own ions an equilibrium is set up. Cu Zn Zn2+(aq) Zn2+(aq) + 2e Zn(s) Cu2+(aq) Cu2+(aq) + 2e− Cu (s) You will recognise the half equations – the diagrams show the half cells. NB: In this work‚ half equations are always shown with electrons on the left. If these two half cells are connected then the same reaction takes place as when a piece of zinc is put into a copper solution: wire Zn salt bridge Cu Redox – revision When a piece of zinc is placed in a copper
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alloying additions (Mn‚ Cu‚ Sb and Zr) on microstructure and corrosion of Zn alloys and hot dip galvanised coatings was undertaken. The first part of this thesis focuses on the effect of alloying additions on the corrosion of Zn alloys. The result shows that Mn is the most beneficial addition‚ which can significantly improve the resistance of Zn. The effect of Cu depends on its concentration. A high level of Cu addition has a deleterious effect on the corrosion resistance as the Cu-rich particles are
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Examples of synthesis reactions: 1. Metal + oxygen → metal oxide EX. 2Mg(s) + O2(g) → 2MgO(s) 2. Nonmetal + oxygen → nonmetallic oxide EX. C(s) + O2(g) → CO2(g) 3. Metal oxide + water → metallic hydroxide EX. MgO(s) + H2O(l) → Mg(OH)2(s) 4. Nonmetallic oxide + water → acid EX. CO2(g) + H2O(l) → ; H2CO3(aq) 5. Metal + nonmetal → salt EX. 2 Na(s) + Cl2(g) → 2NaCl(s) 6. A few nonmetals combine with each other. EX. 2P(s) + 3Cl2(g) →
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metallic deposits on the surface of the metal stip. TABLE 1: Chemical Reaction SOLUTION and METAL EVIDENCE of REACTION PRODUCT 1. AgNO3 + Cu deposits of Ag —> Ag + Cu(NO3)2 2. Cu(NO3)2 + Pb deposits of Cu —> Cu + Pb(NO3)2 3. Pb(NO3)2 + Zn deposits of Pb —> Pb + ZnNO3 4. MgSO4 + Zn no reaction —> no reaction 5. HCl2SO4 + Cu no reaction —> no reaction 6. HCl2SO4 + Zn deposits of H —> H2 + ZnCl2 TABLE 2:
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the calculations involved for each metal Mg(NO3)2 0.1M x 0.05L x 256.14gmol-1 = 1.2807 g Zn(NO3)2 0.1M x 0.05L x 297.0 gmol-1 = 1.4850g FeSO4 0.1M x 0.05L x 151.92gmol-1= 0.7596g Pb(NO3)2 0.1M x 0.05L x 331.22gmol-1= 1.6561 g Cu(NO3)2 0.1M x 0.05L x 230.02 gmol-1 = 1.1501 g OBSERVATIONS Mg(NO3)2 Zn(NO3)2 FeSO4 Pb(NO3)2 Cu(NO3)2 Mg Metal Dark tiny substances (presumably Zn metal) dull the surface of Mg ribbon. Solution remains clear Tiny dark chunks of Fe metal formed
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© Pearson Education Australia (a division of Pearson Australia Group Pty Ltd) 2006. This page from the Chemistry Dimensions 1‚ Teacher’s Resource may be reproduced for classroom use. 9 a Copper b Cu2+ ions (the blue colour) are converted to Cu atoms. 10 a Neutralisation b Decomposition c Redox and combination d Redox and combination and combustion 11 a NO2 b NaNO3 c CaCl2 12 Matter can neither be created nor destroyed‚ only changed from one form to another. 13 a 2C6 H12O6(aq)
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