Answer:
A 50:50 mixture of ethylene glycol and water is effective both summer and winter extremes in temperature because of high boiling point of 106°C and low freezing point of about -37°C. In summer when the average daily temperature rises to about 22°c, the mixture will be effective in keeping the automobile engine cool. Also in winter, when the average temperature falls below 0°C, the mixture will be effective as an antifreeze as it remains a liquid well below 0°C.
Explanation:
Ethylene glycol or antifreeze is an organic compound which is used in automobile engines as a coolant and also as an anti-freezing agent, however it does not conduct heat effectively as water due to its lower heat capacity. It has a freezing point of -12.9°C and boiling point of 197.3°C.
Water is also used as a coolant in automobile engine but it has a limited range due to its boiling point of 100°C. It is also not a good anti-freezing agent due to it high freezing point of 0.°C
However, when ethylene glycol is mixed with water in a ratio of 50:50, the property of the mixture is enhanced to both serve as a coolant and as an antifreeze. The boiling point is elevated to about 106°C while its freezing point is lowered to about -37°C.
This temperature range is effective for both summer and winter temperatures. In summer when the average daily temperature rises to about 22°c, the mixture will be effective in keeping the the automobile engine cool. Also in winter, when the average temperature falls below 0°C, the mixture will be effective as an antifreeze as it remains a liquid well below 0°C.
Answer:
Explanation:
Na₂CO₃ (aq)+ MgCl₂ (aq) = MgCO₃(s) +2NaCl (aq)
MgCO₃(s) is the precipitate .
Ionic equation
2 Na⁺¹ + CO₃⁻² + Mg⁺² + 2 Cl⁻¹ = MgCO₃(s) +2 Na⁺ + 2 Cl⁻
net ionic equation
Mg⁺² + CO₃⁻² = MgCO₃ (s) .
Answer:
The answer to your question is 6 moles
Explanation:
Reaction
2Al₂O₃ ⇒ 4 Al + 3O₂
Check if the reaction is balanced
Reactants Elements Products
4 Aluminum 4
6 Oxygen 6
The number of reactants and products is the same so this reaction is balanced.
We know that for every 2 moles of aluminum oxide consumed 3 moles of oxygen are consumed so we use proportions to find the answer
2 moles of Al₂O₃ ----------- 3 moles of Oxygen
4 moles of Al₂O₃ ----------- x
x = (4 x 3) / 2
x = 12/2
x = 6 moles of oxygen
Answer:
When chlorine and bromine atoms come into contact with ozone in the stratosphere, they destroy ozone molecules.
Explanation: