chemia

    Cards (30)

    • What is the Avogadro constant?
      1. 02 × 10²³ molecules per mole
    • How many grams are in one mole of iron?
      56 grams
    • What is the molar mass of oxygen gas (O₂)?
      32 grams
    • What is the molar mass of ammonia (NH₃)?
      17 grams
    • What is the formula to calculate the number of moles?
      moles = mass in g / Mr
    • How do you write a balanced symbol equation for a reaction?
      1. Calculate the Mr of all substances.
      2. Divide mass by Mr to find moles.
      3. Divide by the smallest number of moles.
      4. Write the balanced equation.
    • What is the Ar of iron (Fe)?
      56
    • What is the Ar of chlorine (Cl)?
      35.5
    • How many moles of iron are in 5.6g?
      0.1 moles
    • How many moles of chlorine are in 10.65g?
      0.3 moles
    • What is the ratio of moles of Fe to Cl in the reaction?
      1. 3
    • What is the balanced symbol equation for the reaction of iron and chlorine?
      2Fe + 3Cl₂2FeCl₃
    • What is a limiting reactant?
      • Reactant used up first in a reaction
      • Stops the reaction from continuing
    • How does halving a reactant affect product amount?
      • Halves the amount of product produced
    • What does conservation of mass state in a chemical reaction?
      Mass of reactants equals mass of products
    • What is the word equation for magnesium reacting with oxygen?
      Magnesium + OxygenMagnesium Oxide
    • What is the balanced symbol equation for magnesium and oxygen reaction?
      2Mg + O₂ → 2MgO
    • What is concentration in terms of solutions?
      Amount of substance in a specific volume
    • What is the formula for calculating concentration?
      concentration = mass ÷ volume
    • How do you calculate the mass of a dissolved substance?
      mass = concentration × volume
    • How is mass conserved in a reaction?
      • Total mass of reactants equals total mass of products
      • Example: 2Mg + O₂ → 2MgO
    • What is the total mass of magnesium oxide produced from 6g of magnesium and 4g of oxygen?
      10 grams
    • What is the relative formula mass (Mr)?
      Sum of all relative atomic masses in a formula
    • How do you calculate the Mr of HCl?
      Mr = 1 + 35.5 = 36.5
    • What is the Mr of H₂SO₄?
      98
    • How do you find the percentage mass of an element in a compound?
      percentage mass = (Ar × number of atoms) / Mr
    • What is the percentage mass of oxygen in magnesium oxide?
      40%
    • How can mass change during a reaction?
      • Mass can increase if a gas is added
      • Mass can decrease if a gas is released
    • What happens to mass when sodium carbonate decomposes?
      Mass decreases due to gas release
    • What is the equation for sodium carbonate decomposition?
      Sodium carbonateSodium oxide + Carbon dioxide
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