1. Nucleus
2. Neutrons
3. Electrons
4. Protons
b). horn corals
c). brachiopods
d). crinoids
Endothermic reactions are reactions that proceed by the absorption of heat (energy) while exothermic reactions involve a release of energy.
a) Formation of frost on a car window in winter is an exothermic process as heat is liberated when liquid water freezes to form crystals
b) Formation of water condensate on a glass of ice water is an endothermic reaction since heat is absorbed by the cold water from the glass container thereby cooling it.
c) A decrease in the temperature as ammonium nitrate is added to water is an endothermic reaction
a) and b) are exothermic processes because they release heat to the surroundings. c) is an endothermic process because it absorbs heat from the surroundings.
Let's analyze each option:
a) Frost forms on a car window in winter: Exothermic
Frost forming is an exothermic process because it releases heat as water vapor in the air condenses and freezes on the cold car window, giving off energy in the form of heat to the surroundings.
b) Water condenses on a glass of ice water on a humid summer afternoon: Exothermic
Similar to the first scenario, water condensation is exothermic. As water vapor from the humid air comes into contact with the cold glass of ice water, it condenses into liquid water, releasing heat to the surroundings.
c) Adding ammonium nitrate to water causes the temperature of the solution to decrease: Endothermic
This process is endothermic because dissolving ammonium nitrate in water absorbs heat from the surroundings, causing the temperature of the solution to decrease.
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A base is an H⁺ acceptor, whereas an acid is an H⁺ donor. Acidic chemicals are typically recognized by their sour flavor.
Any hydrogen which contains a compound capable of giving a proton to another material is described as an acid. An ion and molecule that can receive a hydrogen ion from that of an acid is known as a base. Acidic chemicals are typically recognized by their sour flavor.
In essence, an acid is a substance that has the capacity to donate an H⁺ ion plus maintain its energetic favorability even after losing an H⁺ ion. It is well known that acids may change blue litmus into red. Bases, on the other hand, have a slick consistency and a bitter flavor. A base is an H⁺ acceptor, whereas an acid is an H⁺ donor.
Therefore, a base is an H⁺ acceptor, whereas an acid is an H⁺ donor.
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Answer:
This question is incomplete but the completed question is below
What is used up in and stops a chemical reaction? (a) percent yield (b) limiting reactant (c) theoretical yield (d) excess reactant
The correct option is (b)
Explanation:
A chemical reaction is a chemical combination,rearrangement or disintegration of chemical substance(s) (called reactants) to form new chemical substance(s) (called products).
A limiting reactant is the reactant that is totally used up during the course of a reaction. When this reactant is used up, it limits the amount of products formed and eventually stops the chemical reaction.
Hi
The chemical reaction does not stop until the reagent is used .
I hope that's help !
Answer:
a.) Angel food cake
Explanation:
The correct answer is a) Angel food cake. It is a type of cake made from egg-white foam and contains no fat.