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Atoms and Mass are conserved during a chemical reaction

Atoms and Mass are conserved during a chemical reaction. SNC 2D. Balanced chemical Equation. The number of atoms as reactants must equal the number of atoms of the products. PRODUCTS. REACTANTS . 2 molecules of S odium Hydroxide and 1 molecule of Hydrogen gas. 2 atoms of Sodium

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Atoms and Mass are conserved during a chemical reaction

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  1. Atoms and Mass are conserved during a chemical reaction SNC 2D

  2. Balanced chemical Equation The number of atoms as reactants must equal the number of atoms of the products.

  3. PRODUCTS REACTANTS 2 molecules of Sodium Hydroxide and 1 molecule of Hydrogen gas. 2 atoms of Sodium React with 2 molecules of water React to produce

  4. Conservation of Mass • During a chemical reaction, atoms are not created or destroyed. The atoms in the reactants are rearranged to form the new product substances. • This fact is summarized in a scientific law called the “Conservation of Mass”.

  5. How can this be proved? • Experimental evidence can be measured to show that the mass of the reactants is the same as the mass of the products. 2AgNO3 + Cu Cu (NO3)2 + 2Ag

  6. Mini Investigation Copper(II)Chloride + Aluminum Aluminum Chloride + Copper 3Cu Cl2 + 2Al 2Al Cl3 + 3Cu What did you observe?

  7. Colour change? • Change in temperature? • Bubbles of gas? • New substance(s)?

  8. What type of reaction? • Synthesis • Single displacement • Double displacement • Combustion Answer: Single Displacement.

  9. Reactivity of metals • Metals will react/displace other metals in a certain order. • This is called the reactivity series.

  10. Mnemonic Polite spotted leopard can meet affectionate zebra into tender loving care. single girls please.

  11. Can Metals be Active? • Metals lose electrons to become CATIONS. Metals that lose electrons more easily will displace metals that hold on to their electrons. • The ease with which the metal loses its electrons determines its place in the reactivity series. • Metals that lose only one electron to achieve the stable octet tend to be more reactive.

  12. Potassium which loses the one electron in its valence shell to form a stable octet. Because this lone electron is further from the nucleus than the lone electron in sodium or lithium it is not held in place by the positive attractive forces of the nucleus. Remember that opposite charges attract. • Precious metals such as gold silver and platinum cannot easily lose the required electrons to form the stable octet. Therefore they are less reactive than potassium.

  13. Potassium Atom

  14. Aluminum Atom

  15. Lab Investigation • Purpose: To prove the law of Conservation of Mass. In this lab you will carry out the following skills: 1. Perform and record - carry out experiment • Analyze and interpret – make a data table and record observations. • Communicate – write up a formal lab report

  16. Formal Lab • Must follow the correct format. • Procedure Must be written in past tense passive tense. • NO pronouns are allowed at all in a lab report.

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