Post Test: Module 3 SCI10-Science 10 4Q KNHS
Quiz by Jerald U. Carilla
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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