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Post Test: Module 3 SCI10-Science 10 4Q KNHS

Quiz by Jerald U. Carilla

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10 questions
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  • Q1

    1. Which type of chemical reaction is involved once you turned on the gas stove?

    Combustion Reaction

    Decomposition Reaction

    Combination Reaction

    Single Replacement Reaction

    30s
  • Q2

    2. Which is NOT TRUE about the Law of Conservation of mass?

    Mass is neither created nor destroyed in a chemical reaction.

    The product of the reaction is different from the reactants but, the mass is still the same.

    The total mass of the product of the reaction is less than the reactants.

    The number of atoms before and after the reaction is equal.

    30s
  • Q3

    3. How can we say that a chemical reaction took place between reactants?

    Both Statement 1 and 2 are correct

    Statement 1: If a new product was formed.

    Statement 2: If there is a change in color, state, odor, and taste, or bubbles evolve.

    Statement 3: If the reactants’ number of atoms remains the same.

    30s
  • Q4

    4. Determine the type of chemical reaction: H2O (l) + MgO (s) → Mg(OH)2 (s)

    Combination

    Decomposition

    Single Replacement

    Combustion

    30s
  • Q5

    5. Determine the type of chemical reaction: 2NaCl (s) + F2 (g) → 2NaF (s) + Cl2 (g)

    Combustion

    Combination 

    Double Replacement

    Single Replacement

    30s
  • Q6

    6. Determine the type of chemical reaction: 2NaClO3 (s) → 2NaCl (s) + 3O2 (g)

    Decomposition

    Combination 

    Double Replacement

    Combustion

    30s
  • Q7

    7. Determine the type of chemical reaction: 3Ba (s) + Cr2O3 (s) → 3BaO (s) + 2Cr (s)

    Double Replacement

    Decomposition

    Single Replacement

    Combustion

    30s
  • Q8

    8. What numerical coefficients are needed to balance the equation: ___CH4 (g) + ___O2 (g) → ___CO2 (g) + ___H2O (g)

    CH4 (g) + O2 (g) → CO2 (g) + H2O (g)

    CH4 (g) + 2O2(g) → CO2 (g) + 2H2O (g)

    2CH4 (g) + O2 (g) → 4CO2 (g) + 2H2O (g)

    CH4(g) + O2 (g) → 2CO2 (g) + H2O (g)

    30s
  • Q9

    9. What numerical coefficients are needed to balance the equation:___CaCO3 (s) + ___ HCl (aq) → ___ CaCl2 (aq) + ___ CO2 (g) + ___ H2O (l)

    CaCO3 (s) + HCl (aq) → CaCl2 (aq) + 2CO2 (g) + H2O (l)

    2CaCO3 (s) + HCl(aq) → CaCl2 (aq) + CO2 (g) + H2O (l)

    CaCO3 (s) + 2HCl (aq) → CaCl2 (aq) + CO2 (g) + H2O (l)

    CaCO3 (s) + HCl (aq) → 2CaCl2 (aq) + CO2 (g) + H2O (l)

    30s
  • Q10

    10. If I want to use a wire to hang my plants, which will last longer: an iron wire or a copper wire? Why?

    An iron wire because it is less reactive to water and oxygen than copper.

    A copper wire because it is reactive to water and oxygen under normal condition.

    An iron wire because it is more reactive to water and oxygen than copper.

    A copper wire because it will not react with water and oxygen under normal condition.

    30s

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