Which radioisotope emits alpha particles?
(1) Fe-53 (3) Au-198
(2) Sr-90 (4) Pu-239
Answers
Answer : Option 4) Pu-239
Explanation : Plutonium-239 is a radioisotope of the element plutonium which emits alpha particles. The decaying process of Pu-239 emits alpha particles. It is widely used as a nuclear reactor fuel. Pu-239 is also used as a primary fissile isotope for the production of nuclear weapons.
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A sample of a compound contains 32.0 g C and 8.0 g H. Its molar mass is 30.0 g/mol. What is the compound’s molecular formula
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Answers
Final Answer:
The solvent in iced tea is water.
Explanation:
In the context of chemistry, a solvent is a substance that has the ability to dissolve other substances, known as solutes, to form a homogeneous mixture called a solution. In the case of iced tea, the primary component of the drink is water. Water serves as the solvent because it has the capability to dissolve various solutes, including sugar, tea leaves or tea bags (which contain soluble compounds), and any flavorings that may be added to the tea.
When making iced tea, one typically starts by brewing a concentrated tea solution by steeping tea leaves or tea bags in hot water. The hot water allows the soluble compounds in the tea leaves to dissolve into the liquid, creating a tea concentrate. Afterward, this concentrate is typically diluted with cold water and sweetened to taste using sugar or another sweetener. The sugar, being a solute, dissolves in the water (solvent) to create a sweet tea solution.
So, in the case of iced tea, the solvent that dissolves the solutes (tea compounds, sugar, and flavorings) is water. Water is commonly used as a solvent in many beverages and chemical processes due to its excellent ability to dissolve a wide range of substances.
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Answer:
Since the lawyer is serving iced tea, the solvent in this case is the tea itself.
Explanation:
A solvent is the liquid that dissolves another substance. The tea is the liquid into which the sugar will dissolve.
Answers
Answer:
The correct answer is elevation.
Explanation:
In a geographical place, the elevation refers to the height below or above a precise reference point generally above the sea level. The term elevation is primarily applied when considering towards the points on the surface of the Earth, while geopotential height or altitude terms are used for considering the points above the surface like a spacecraft in orbit or an aircraft in flight, and depths are applied for the points underneath the surface.
Answers
The oxidation number is also called as oxidation state. The oxidation number of oxygen in the carbonate ion found in malachite is -2.
What is oxidation number ?
The charge that an atom would have if all of its links to other atoms were fully ionic is known as the oxidation state, also known as the oxidation number. It describes how much an atom in a chemical molecule has been oxidized. The oxidation state might theoretically be positive, negative, or zero.
Antoine Lavoisier used the term "oxidation" to describe the interaction of a material with oxygen. The definition was eventually expanded to cover additional processes in which electrons are lost, regardless of whether oxygen was present, because it was understood that the material loses electrons when it is oxidized.
Thus, The oxidationnumber of oxygen in the carbonate ion found in malachite is -2.
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Answers
Explanation:
Sodium has atomic number of 11 with electronic configuration of :
Sodium loose it single electron to attain stability of noble gas configuration. While this process electron gets removed from the outer shell of the sodium atom and it gains positive charge of +1.
(Ionization)
A change on the molecular level.
A change in appearance.
A change in taste.
A change in form.
Answers
The phrase that most accurately describes a chemical change is; "A change on the molecular level."
The major difference between a physical change and a chemical change is that a chemical change involves a change in the composition of a substance.
This implies that the atoms in a substance are rearranged during a chemical change.
This rearrangement of atoms corresponds to change on a molecular level.
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Production of a gas (bubbles)
Production of heat
Production of light
Color change
Production of a solid (precipitate) in a solution
So from those answers we see that A is the correct answer.
Answers
The molarity of the solution made by dissolving 298 g of KCl in enough water to make 2 L of the solution is 2 M
- We'll begin by calculating the number of mole in 298 g of potassium chloride, KCl. This can be obtained as follow:
Mass of KCl = 298 g
Molar mass of KCl = 39 + 35.5 = 74.5 g/mol
Mole of KCl =?
Mole = mass / molar mass
Mole of KCl = 298 / 74.5
Mole of KCl = 4 moles
- Finally, we shall determine molarity of the KCl solution. This can be obtained as follow:
Mole of KCl = 4 moles
Volume = 2 L
Molarity of KCl =?
Molarity = mole / Volume
Molarity of KCl = 4 / 2
Molarity of KCl = 2 M
Therefore, the molarity of the KCl solution is 2 M.
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Answer:
2 M
Explanation:
The equation for molarity is "M = moles/liters"
Potassium chloride's atomic mass is 74.55, meaning one mole of KCl is equal to 74.55g. In the equation, 298g of KCl is being used. To find out how many moles this is, multiply 298g of KCl by (1 mol/74.55g of KCl) to get 4.0 moles. Now you can use the equation for molarity.
M = 4.0 moles/2 Liters