The question was not well arranged above. It has been arranged in the answer below.
Question:
Leon made a study chart about human-induced changes to the environment.
Environmental Changes Caused by Humans
X Y
Results from introducing harmful substances into the environment
Example: oil spill
Results from natural areas being cleared and replaced by human development
Example: deforestation
Which headings best complete the chart?
X: Habitat Destruction
Y: Pollution
X: Long-Term Changes
Y: Short-Term Changes
X: Short-Term Changes
Y: Long-Term Changes
X: Pollution
Y: Habitat Destruction
Answer:
X: Pollution
Y: Habitat Destruction
Explanation:
From the above question, Leon gave us two variables, X and Y.
The human induced changes were divided into two.
1. Results from introducing harmful substances into the environment
Introducing harmful substances into the environment is also called pollution. And we can represent this as X which is the first variable.
2. Results from natural areas being cleared and replaced by human development.
This description given in number two above whereby land areas are been cleared and replaced by human development has a negative effects on the environment because the vegetation which includes the trees are been cut down and living organisms(animals) will go extinct gradually. This act affect the balance of the ecosystem and it can be referred to as the destruction of the habitat of living organisms
Therefore, the correct headings best complete the chart is :
X: Pollution
Y: Habitat Destruction
<h3>
Answer:</h3>
1.24 × 10³ kJ/mol
<h3>
Explanation:</h3>
From the question we are given;
Heat capacity of the calorimeter =23.3 kJ/°C
Temperature change, ΔT = 76°C - 35°C
= 41 °C
Mass of ethanol = 35.6 g
Molar mass of ethanol = 46.07 g/mol
We are required to determine the molar enthalpy
We can use the following steps:
<h3> Step 1 : Calculate the heat change of the reaction</h3>
Heat change will be equivalent to heat gained by the calorimeter.
Therefore;
Heat = heat capacity × change in temperature
Q = CΔT
= 23.33 kJ/°C × 41°C
= 955.3 kJ
<h3>Step 2 : Calculate the moles of ethanol burned </h3>
Moles = mass ÷ Molar mass
Therefore;
Moles of ethanol = 35.6 g ÷ 46.07 g/mol
= 0.773 moles
<h3>Step 3: Calculate the molar enthalpy of the reaction </h3>
Heat change for 0.773 moles of ethanol is 955.3 kJ
0.773 moles = 955.3 kJ
1 mole will have ,
= 955.3 kJ ÷ 0.773 moles
= 1235.83 kJ/mol
= 1.24 × 10³ kJ/mol
But since the reaction is exothermic (release of heat) then the enthalpy change will have a negative sign.
Thus;
ΔH = -1.24 × 10³ kJ/mol
The <span>reactions are an explosion hope it helps.</span>
Start studying Pressure - Volume Relationships in Gases (Boyle's Law). Learn vocabulary, terms ...Select<span> all that apply. V2 = k/P2 V2 = P1V1/P2 ... What </span>two variables<span> are </span>held constant when testing Boyle's Law in a manometer<span>? Temperature hope this helps
</span>
Answer: The statement which could possibly not be true is C -" Liquid X can exist as a stable phase at 25°C, 1atm."
Explanation:
Triple point is the point where a substance co-exist as solid liquid and gas. At any point other than the triple point, the substance exist as a single phase substance.
As shown in the diagram, Liquid cannot exist as a stable phase at 1atm( below the the triple point pressure of 2atm) as the liquid can only exist beyond the pressure of triple point.
