Which substance has a melting point greater than room temperatureO A. argon
O B. oxygen
O
C. mercury
O D. aluminum

Answers

Answer 1

Answer:

Aluminum is solid at room temperature and will, therefore, have a melting point that is above room temperature.

Melting point

The room temperature is about 25 degrees Celsius.

Argon and oxygen are gases at room temperature.

Mercury is a liquid at room temperature.

Aluminum, on the other hand, is solid at room temperature. Hence, its melting point is definitely somewhere above room temperature.

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1. For each of the following numbers, by how many places must the decimal point bemoved to express the number in scientific notation?
II. For each number, will the exponent be positive, negative, or zero?
0.0000089911

Answers

The number that you have shown the exponent would be negative and I believe it would be 6 places so 8.9911 x 10^-6

Any substance composed of two or more elements that are chemically combined in a fixed proportion is(1) an isomer (3) a solution
(2) an isotope (4) a compound

Answers

Any substance composed of two or more elements that are chemically combined in a fixed proportion is known as a Compound. Thus, it's D.

What do you mean by Elements?

Elements may be defined as any substance that cannot be disintegrated into more superficial substances by standard chemical processes.

In chemistry, an isomer may be defined as those molecules which the same molecular formulas, but different arrangements of atoms.

An Isotope may be defined as an atom that bears the same atomic number and chemical identities but possesses a different atomic mass.

A solution may be defined as a homogeneous mixture of one or more solutes disbanded in a specific solvent.

Therefore, the correct option for this question is D.

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(4) a compound is the correct answer~

Which catalyst is better for the decomposition of Hydrogen Peroxide(H₂O₂) , Potassium Iodide(KI) or Yeast? Explain why. Please help ASAP, very much appreciate it. Thankyou in advance.

Answers

Yeast, because it acts as a catalyst, or a helper, to remove the oxygen from the hydrogen peroxide

an atom has 2 electrons in the first energy level, 8 electrons in the second energy level, and 1 electron in the third energy level. What is the number of core electrons

Answers

Considering the definition of electronic configuration and valence shell, the number of core electrons is 1, because the valance shell is the third energy level.

The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).

There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level. Electrons with less energy will be spinning at level 1.

Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f.

Aufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits around the nucleus of the atom.

This principle states that the filling of these orbitals occurs in increasing order of energy, that is, from the orbitals of lower energy to those of higher energy.

The simplest of the sub-levels is 1s. If you fill the 1s you can start filling the 2s. After the 2s sub-level is satisfied, the 2p can begin to fill and so on.

The valence shell is the one where the outermost electrons are found, those electrons that are in the last level. Because it is the outermost shell, it is also the farthest from the atomic nucleus.

The valence shell is one whose electrons are responsible for the chemical properties of an element.

In this case, an atom has 2 electrons in the first energy level, 8 electrons in the second energy level, and 1 electron in the third energy level. So, the number of core electrons is 1, because the valance shell is the third energy level.

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Final answer:

The atom described has 10 core electrons. These are located in the first and second energy levels, which are filled from lowest to highest. The electron in the third energy level is a valence electron.

Explanation:

The question you asked involves understanding the structure of atomic energy levels (or shells). In an atom, electrons fill in the energy levels from lowest to highest. The core electrons are those in the inner energy levels.

In your case, the atom has 2 electrons in the first energy level and 8 in the second energy level, making a total of 10 core electrons. The one electron in the third energy level would be considered a valence electron, not a core electron, because it's located in the outermost energy level of the atom.

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1.Cheraw is a folk dance native to Mizoram. True or False?2.Neon is used in electric signs and fluorescent lamps .true or false?

Answers

Answer:

true

Explanation:

pki points nmn po

Does a solution have to involve a liquid? Explain your answer

Answers

not actually because a solution in math also involves the answer as well as physics.

Final answer:

A solution is a homogeneous mixture and does not necessarily have to include a liquid component. It can exist in gas, liquid, and solid states. Examples include air (a gas solution) and alloys (a solid solution).

Explanation:

No, a solution doesn't always have to involve a liquid. This is a common misunderstanding because water is often used as a solvent, which leads many to associate solutions with liquids. However, solutions can exist in all states of matter: gas, liquid, and solid.

A solution is a homogeneous mixture of two or more substances. The substance present in the largest quantity is usually the solvent, and substances in lesser amounts are the solutes.

For instance, air is a gaseous solution involving nitrogen, oxygen, and various other gases. Alloys, like the nickel dissolved in copper in US five-cent coins, are examples of solid solutions. Therefore, while often associated with liquids, solutions can exist across various physical states.