The melting points of canola oil, corn oil, sunflower oil, and peanut oil are 10°C, –11°C, –17°C, and –2°C. If you cool a mixture of these oils to 5°C, which one can you separate easily?
Answers
Answer: the canola oil.
Explanation:
According to the melting points reported, at 5°C canola oil, whose melting point is 10°C, will freeze (become solid), while the other three, corn oil, sunflower oil, and peanut oil, having melting points several degrees below 5°C, will remain in liquid state.
Therefore, by decantation or filtration, which are processes that permit separate solids from liquids in a mixture, you can separate easily the solid canola oil from the other three liquid oils.
After separating the canola oil, If you continue cooling the mixture and reach a temperature of - 5°C. the peanut oil, whose melting point is -2°C, whill freeze and you will be able to separate it (again by decantation or filtration).
The same operation, cooling a third time until a temperature around 12°C, will permit you to separate the remaining two oils.
As you see, the knowledge of the physical properties of the substances is a useful tool to separate mixtures.
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Food is shipped thousands of miles throughout our country using various types of transportation such as trucks, planes, and boats. Food availability would be most affected by a shortage in which of the following energy sources? Coal Natural gas Petroleum Water power
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Uncontrolled chain reactions can only happen during nuclear fission.
It is impossible to cause a fusion reaction to happen anywhere outside of the sun.
We are safe because there is no radioactive hydrogen in the air.
Answers
Nuclear fusion in the sun involves hydrogen (H) atoms combining to form helium (He). A student claims that since the atmosphere contains hydrogen, any fusion reaction on Earth would result in an uncontrolled chain reaction. What is wrong in the student’s reasoning is that the uncontrolled chain reactions can only happen during nuclear fission.
Uncontrolled chain reactions can only happen during nuclear fission is what is wrong with the student's reasoning.
What is Nuclear fission?
This is the process in which the nuclei of an atomsplit into two or more nuclei with large amount of heat being involved.
Nuclear fusion in the sun involves hydrogen atoms combining to form helium and the student claims that since the atmosphere contains hydrogen, any fusion reaction on Earth would result in an uncontrolled chain reaction which is wrong as it occurs only during fission.
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Which type of reaction is represented by this equation?
(1) synthesis
(2) decomposition
(3) single replacement
(4) double replacement
Answers
Answer: Option (2) is the correct answer.
Explanation:
An equation in which the the number of reactants equal the number of products is known as a balanced equation.
Whereas a reaction in which a compound dissociates into two or more compounds is known as a decomposition reaction.
Therefore, the given reaction represents that
decomposes into KCl and
.
Hence, it is a decomposition reaction.
Decomposition reaction is the type of reaction that is represented by the given equation. Therefore, the correct option is option 2.
A chemical reaction called a decomposition reaction, often referred to as an analysis or dissociation, occurs when a compound disintegrates into more basic elements. A single compound is transformed into two or more products in this reaction, which may be elements or other compounds.
Decomposition reactions are typically induced by heat, light, electricity, or the presence of a catalyst. These reactions occur because the reactant compound is unstable under certain conditions, leading to its breakdown into more stable products. Therefore, is a decomposition reaction.
Therefore, the correct option is option 2.
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(2) melting and evaporating
(3) condensation and sublimation
(4) condensation and deposition
Answers
Melting and evaporating are the physical changes that are endothermic. Therefore, the correct option is option 2.
Physical modifications are those that modify a chemical substance's shape yet do not affect its chemical content. Physical changes may normally be utilised to separate compounds to chemical elements and simpler compounds, but they cannot be utilised for separate mixtures to their individual components. When something changes physically but not chemically, it is said to have undergone a physical transformation. This contrasts to the idea of a chemical change, when a material's composition changes or a substance or substances mix or separate to generate new compounds. Melting and evaporating are the physical changes that are endothermic.
Therefore, the correct option is option 2.
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Answers
Final answer:
The reaction will proceed in the forward direction to reach equilibrium.
Explanation:
To determine which reaction will go in order to reach equilibrium, we need to compare the initial number of moles of reactants to the stoichiometric coefficients of the balanced equation. The balanced equation for the reaction between NH₃, N₂, and H₂ is:
NH₃ + N₂ ↔ 2NH₃
Since the initial number of moles of NH₃, N₂, and H₂ are the same (1.00 mole each), the reaction will proceed in the forward direction to reach equilibrium.
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Answers
Answer:
C. All electron carriers are mobile and hydrophobic
Explanation:
Hello,
In this case, it is widely known that the electron carriers move inside the inner mitochondrial membrane and consequently move electrons from one to another. In such a way, they are mobile, therefore they are largely hydrophobic as long as they are inside the membrane.
For instance, the cytochrome c is a water-soluble protein in a large range, therefore, the answer is: C. All electron carriers are mobile and hydrophobic.
Best regards.