What's the electron configuration of Zr (AN 40)
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Carbon-14 is the typical radioisotope used to date materials; however, it has a limitation to 40,000 years. A scientist who wants to date materials older than 40,000 years would most likely use ?
Which process is most responsible for the formation of the grand canyon???? A) scouring by continental glaciers B) erosion by wind and water C) eruptions by explosive volcanoes D) cracking of earths crust by earthquakes
b. element
c. molecule
d. compound
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Answer:
A) Solution
Explanation:
Final answer:
A solution is not a pure substance, while elements, molecules, and compounds are examples of pure substances. The correct option is A.
Explanation:
The correct answer is a. solution. A solution is a mixture of two or more substances, so it is not a pure substance. Examples of solutions include saltwater and sugar water. On the other hand, elements, molecules, and compounds are all examples of pure substances. An element is a substance that cannot be broken down into simpler substances, such as gold or oxygen. A molecule is a combination of two or more atoms held together by chemical bonds, like water (H₂O) or carbon dioxide (CO₂). Lastly, a compound is a substance made up of two or more different elements chemically bonded together, like table salt (NaCl) or water (H₂O).
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Answer: H₂SO₄ is the chemical formula that represents sulfuric acid.
Explanation:
1) H stands for hydrogen and H₂ means that each unit contains two atoms of hydrogen.
2) S stands for sulfur. Since there is not subscript, means each unit contains one atom of sulfur.
3) O stands for oxygen, and O₄ means that each unit has four oxygen atoms.
4) The way the compound is build up is the S atom at the center with two double bonds to each to one atom of O, and two single bonds one to each OH ion.
5) Sulfuric acid is a strong acid, so it dissociates in water and alghough the formula H₂SO₄ is used to represent it, the aqueous solution is formed by ions: HSO₃⁻, H⁺, SO₄²⁻, and OH⁻, as represented by these dissociation equaitons show:
1) H₂SO₄ ⇄H⁺ + HSO₄⁻ first dissociation
2) HSO₄⁻ ⇄ H⁺ + SO₄²⁻ second dissociation
So, H₂SO₄ is one form to represent sulfuric acid.
Final answer:
In an aqueous solution, H₂SO₄ represents sulfuric acid.
Explanation:
In an aqueous solution, H₂SO₄ represents sulfuric acid. Sulfuric acid is a strong diprotic acid that ionizes in two stages. The first stage is essentially complete in an aqueous solution, while the secondary ionization is less complete, resulting in the formation of HSO₄⁻, which is a moderately strong acid.
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Answer: The isotope will be represented by symbol .
Solution:
The isotope of an element is represented by:
X = Symbol of an element
Z = Atomic Number of that element = Total number of electrons or protons
A = atomic mass of that element = Z+ total number of neutrons
So the uranium isotope with atomic mass of 238 and atomic number of 92 will be written as:
Answer:
B. 238/92 U
Explanation:
Correct answer on edge 2022
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Kinetic energy is all about motion. If you think about it, the particles are going from a more chaotic state to a more orderly arrangement which reduces the kinetic energy.
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Cl2(aq) + 2Br-(aq) --> 2Cl- + Br2(aq)
Looking at each substance involved in the reaction:
Cl2 has 0 charge and gains a charge of -1 after the reaction
Br- has a charge of -1 but turns to 0 after the reaction
Cl2 gained an electron which means it is the reduced substance
Br- lost an electron which means it is the oxidized substanced
Consequently, Cl2 is the oxidizing agent and Br- is the reducing agent.
Answer:
Bromine (Br) loses an electron, so it is the reducing agent.
Explanation:
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