C3

• What is the law of conservation of mass?

  No atoms are lost or made during a chemical reaction
• How does the law of conservation of mass apply to chemical reactions?

  The mass of the products equals the mass of the reactants
• If 24 grams of magnesium reacts with 71 grams of chlorine, what is the mass of magnesium chloride produced?

  95 grams
• What are the reactants in the reaction where magnesium reacts with chlorine?

  Magnesium and chlorine
• What is produced when magnesium reacts with chlorine?

  Magnesium chloride
• If 92 grams of sodium reacts with 32 grams of oxygen, what is the mass of sodium oxide produced?

  124 grams
• How do you calculate the mass of calcium carbonate that reacted if it produced 112 grams of calcium oxide and 88 grams of carbon dioxide?

  The mass of calcium carbonate is 200 grams
• In the reaction of magnesium oxide with hydrogen chloride, what is the total mass of products produced?

  113 grams
• How do you find the mass of magnesium oxide that reacted if 73 grams of hydrogen chloride was used and produced 95 grams of magnesium chloride and 18 grams of water?

  The mass of magnesium oxide is 40 grams
• What are the steps to calculate the mass of products in a chemical reaction using the law of conservation of mass?

  • Identify the reactants and products
  • Calculate the total mass of the reactants
  • Apply the law of conservation of mass: mass of products = mass of reactants
• What types of questions can you expect regarding calculating masses in chemical reactions?

  • Calculate mass of products from given reactants
  • Determine mass of reactants from known products
  • Solve for unknown masses in various chemical reactions
• What type of ions do metals typically form?

  Positive ions
• What type of ions do most non-metals form?

  Negative ions
• How can you relate charges on ions to groups in the periodic table?

  The charge on a metal ion often corresponds to its group number
• What is the general rule for the charge of metal ions based on their group number?

  • Group 1: 1+ ion (e.g., Sodium, Na⁺)
  • Group 2: 2+ ion (e.g., Magnesium, Mg²⁺)
  • Group 3: 3+ ion (e.g., Aluminium, Al³⁺)
• What is the charge of the sodium ion?

  1+
• What is the charge of the magnesium ion?

  2+
• What is the charge of the aluminium ion?

  3+
• Which metals form 1+ ions in group 1?

  Lithium and potassium
• Which metals form 2+ ions in group 2?

  Beryllium and calcium
• Which metals form 3+ ions in group 3?

  Gallium and indium
• What is a characteristic of transition metals regarding ion formation?

  They can form several different ions
• What are the two common ions formed by iron?

  Fe²⁺ and Fe³⁺
• What are the two common ions formed by copper?

  Cu⁺ and Cu²⁺
• What is the charge of the oxide ion?

  2-
• What is the charge of the fluoride ion?

  1-
• How does the charge of the oxide ion relate to its group in the periodic table?

  Oxygen is in group 6 and forms a 2- ion
• What is the charge of the sulfide ion?

  2-
• What is the charge of the hydrogen ion?

  1+
• What is the charge of the ammonium ion?

  1+
• What are some examples of ionic compounds and their formulas?

  • Sodium sulfate: Na₂SO₄
  • Calcium hydroxide: Ca(OH)₂
• What skill will be developed in the next video related to ionic compounds?

  Working out the formula of ionic compounds
• What should you be able to describe by the end of the video?

  How metal ions are positive and most non-metal ions are negative
• What is the relationship between the charges on ions and their groups in the periodic table?

  Charges on ions can be relayed to their groups in the periodic table
• Where are metals located in the periodic table?

  On the left
• Where are non-metals located in the periodic table?

  On the right
• What is the definition of ions?

  Atoms with a charge
• What is the charge of lithium ion?

  1+
• What is the charge of potassium ion?

  1+
• What is the charge of beryllium ion?

  2+