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A volcano is caused by a rupture in the crust from which molten magma
escapes
The correct options are;
- B. Two continental plates
- C. Volcanoes
- C. A tsunami in the ocean
- C. The temperature in the mantle is higher than in the crust
- A. Volcanic island arcs
- A. Earthquake
- B. Trench
- C. Subduction
- A. Fault
- C Tsunami
- A. Convergent plate boundary
- See attached drawing (<em>Based on Department of Education Science Module)</em>
- D. a, b and c
- C. Converging oceanic plates
- It is where the oceanic plates subduct under the continental plate
Reasons:
1. Due to the equal densities and buoyancy of the plates, there is no
subduction and the plates rise to form mountain ranges and no volcanoes.
2. The subduction causes the plates to form magma and then volcanoes.
3. Shallow earthquakes that have their epicenter at the fault line in the
ocean generate a tsunami.
4. The mantle lay under each plate and therefore, the high temperatures
of the mantle does not support the fact.
5. Volcanic arcs are formed in the convergence of two oceanic or oceanic
and continental plates.
6. When two continental plates converge, shallow earthquakes occur.
7. A crack called a trench is formed by the interaction of an oceanic crust
and another crust.
8. A subduction occurs when oceanic plates converge.
9. A fault is produced by horizontal plate movement.
10. A Flip or kick upwards of water is known as a tsunami.
11. Subduction occurs during convergence of two plates such that a
subducted plate goes down beneath an overriding plate.
12. The illustration of seafloor spreading consists of two plates moving
away from each other.
<em>Question 12: Based on Department of Education Science Module</em>.
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13. Earthquake occur at places where the plates are moving (including
subducting).
14. Volcanic island arcs are formed by two oceanic plates.
15. At the location where the continents meet the seas, oceanic plates are
subducted under the continental plate, melted to magma in the mantle
from which volcano is formed.
Learn more about volcanoes here:
Answer:
11.4
Explanation:
Step 1: Given data
- Concentration of the base (Cb): 0.300 M
- Basic dissociation constant (Kb): 1.8 × 10⁻⁵
Step 2: Write the dissociation equation
NH₃(aq) + H₂O(l) ⇄ NH₄⁺(aq) + OH⁻(aq)
Step 3: Calculate the concentration of OH⁻
We will use the following expression.
Step 4: Calculate the pOH
We will use the following expression.
Step 5: Calculate the pH
We will use the following expression.
Answer:
1. Total pressure is 475 torr.
2. The partial pressure of CO is 23.8 torr.
3. The mole fraction of CO is 0.0501.
Explanation:
We have 3 gases in different bulbs. Once the stopcocks are opened, they share the same final volume which is the sum of all individual volumes.
V = Va + Vb + Vc = 150 mL + 300 mL + 750 mL = 1200 mL
Since we know initial pressures and volumes for each gas, we can find the final pressures using Boyle's Law. The mathematical expression is
P₁ . V₁ = P₂ . V₂
We assume that temperature remains constant and that gases behave as ideal gases.
CO
P₁ = 190 torr; V₁ = 150 mL; P₂ = ?; V₂ = 1200 mL
P₁ . V₁ = P₂ . V₂
190 torr . 150 mL = P₂ . 1200 mL
P₂ = 23.8 torr
Ar
P₁ = 0.500 atm; V₁ = 300 mL; P₂ = ?; V₂ = 1200 mL
P₁ . V₁ = P₂ . V₂
0.500 atm . 300 mL = P₂ . 1200 mL
P₂ = 0.125 atm
Kr
P₁ = 75.994 kPa ; V₁ = 750 mL; P₂ = ?; V₂ = 1200 mL
P₁ . V₁ = P₂ . V₂
75.994 kPa . 750 mL = P₂ . 1200 mL
P₂ = 47.5 kPa
The total pressure is the sum of partial pressures.
P = P(CO) + P(Ar) + P(Kr) = 23.8 torr + 95.0 torr + 356 torr = 475 torr
We can find the mole fraction of of CO using the following expression, based on Dalton's Law:
P(CO) = P . X(CO)
where,
X(CO) is the mole fraction of CO
Then,
X(CO) = P(CO)/P = 23.8 torr / 475 torr = 0.0501.