How does Earth's rotation axis cause seasons to change?

1 answer:

6 0

Earth's Tilt is the reason for the seasons!During the year,the seasons change depending on the amount of sunlight reaching the Earth as it revolves around the Sun.The seasons are caused as the Earth tilted on its axis travels in a loop around the sun each year.

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How much heat is transferred in the process of completely melting a 1.6kg block of ice starting at -15 degrees Celsius? Is this

mixas84 [53]

Answer:

a) Heat = 590 kJ

b) Endothermic

Explanation:

Endothermic processes absorb energy. The final state contains more energy than the initial state.

Since ice absorbs heat energy in the process of completely melting this is an endothermic process.

The process involves two stages: 1) heating the ice up to the melting point, which is 0ºC, and 2) melting the ice.

1. Heating the ice from -15ºC to 0ºC

a) Formula: Q = m×C×ΔT

m = 1.6 kg

C = 2.108 kJ/kg.ºC (specific heat of ice)

ΔT = 15ºC

b) Calculations:

Q = m×C×ΔT = 1.6 kg × 2.108 kJ/kg.ºC × 15ºC = 50.592 kJ

2. Melting the ice at 0ºC

a) Formula: L = m × ΔHf

m = 1.6 kg

ΔHf = 334 kJ/kg (latent heat of fussion)

b) Calculations

L = m × ΔHf = 1.6 kg × 334 kJ/kg = 534.40 kJ

2. Total heat

50.592 kJ + 534.40 kJ = 584.992 kJ ≈ 590 kJ (rounded to 2 significant figures)

4 0

3 years ago

A solution is made by dissolving 4.87 g of potassium nitrate in water to a final volume of 86.4 mL solution. What is the weight/

lara31 [8.8K]

Answer:

A solution is made by dissolving 4.87 g of potassium nitrate in water to a final volume of 86.4 mL solution. The weight/weight % or percent by mass of the solute is :

2.67%

Explanation:

Note : Look at the density of potassium nitrate in water if given in the question.

You are calculating weight /Volume not weight/weight % or percent by mass of the solute

Here the weight/weight % or percent by mass of the solute is asked : So first convert the VOLUME OF SOLUTION into MASS

Density of potassium nitrate in water KNO3 = 2.11 g/mL

$density=\frac{mass}{volume}$