b. arteriosclerosis
c. heart attacks
d. heart failure
Answer;
B. arteriosclerosis
High levels of cholesterol can first lead directly to arteriosclerosis.
Explanation;
Atherosclerosis refers to the buildup of fats, cholesterol and other substances in and on your artery walls (plaque), which can restrict blood flow. The plaque can burst, triggering a blood clot.
Arteriosclerosis can occur when arteries grow thick and stiff and restrict blood flow to organs and tissues in the body. This gradual process, also known as hardening of the arteries, weakens arteries and can develop in various organs, most commonly the heart.
Explanation:
Let's analyze the statements one by one:
a) This process is exothermic.
True. The negative enthalpy change (-2,021 kJ) indicates that heat is released during the reaction, making it exothermic.
b) The enthalpy change for 2C₃H₇OH(l)+9O₂(g)→6CO₂(g)+8H₂O(l) is 2,021 kJ.
False. The balanced chemical equation and enthalpy change given are for the combustion of 1 mole of propanol, not 2 moles.
c) The enthalpy change for 2C₃H₇OH(l)+9O₂(g)→6CO₂(g)+8H₂O(l) is -4,042 kJ.
False. This statement suggests a doubled enthalpy change value in the wrong direction. The correct direction is negative (exothermic), but the magnitude is not doubled.
d) The enthalpy change for 2C₃H₇OH(l)+9O₂(g)→6CO₂(g)+8H₂O(l) is -2,021 kJ.
False. This statement suggests the correct direction but doubles the magnitude. The correct magnitude is -2,021 kJ for 1 mole of propanol.
e) This chemical process transfers heat from the surroundings to the system.
False. The process is exothermic, which means it releases heat from the system to the surroundings.
f) The enthalpy change for 2C₃H₇OH(l)+9O₂(g)→6CO₂(g)+8H₂O(l) is 4,042 kJ.
False. This statement suggests the correct magnitude but in the wrong direction. The correct direction is negative (exothermic).
g) This process is endothermic.
False. The process is exothermic, as indicated by the negative enthalpy change.
h) This chemical process transfers heat from the system to the surroundings.
True. An exothermic process like this releases heat from the system to the surroundings.
So, the correct statements are:
a) This process is exothermic.
e) This chemical process transfers heat from the surroundings to the system.
h) This chemical process transfers heat from the system to the surroundings.
(2) sublimation (4) solidification
a. True
b. False
Answer: True
Explanation: An ionic bond is formed when an element completely transfers its valence electron to another element.
Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself.
The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element.
This bond is formed between a electropositive metal and a electronegative non-metal .
Ionic bonds result from high electronegativity differences. True.
Ionic bonds result from high electronegativity differences. True. An ionic bond is formed when one atom, usually a metal, transfers one or more electrons to another atom, typically a nonmetal, resulting in the formation of ions with opposite charges. Electronegativity is the tendency of an atom to attract a shared pair of electrons in a covalent bond. When there is a high electronegativity difference between two atoms, one atom will strip electrons away from the other, leading to the formation of ionic bonds.
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