Answer: A
Explanation: A is the answer
The Copernican model that is most similar to Aristarchus' . It is a simple and accurate heliocentric model that explains planetary motion with a small set of rules and a single underlying force.
The Copernican model that is most similar to that of Aristarchus is represented by Figure 6.31(b). In this model, Earth and other planets revolve around the Sun. It is a simpler and more accurate heliocentric model, similar to Aristarchus' idea of a heliocentric solar system. The Copernican model explains planetary motion with a small set of rules and a single underlying force, demonstrating the breadth and simplicity of the laws of physics.
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SiC
C25H52
Zn
Answer:
The paraffin is the softest.
Explanation:
The others materials, they have a bigger value of hardness in Mohs scale, like the CuO with a value of 3.5, the SiC with a value of 9, and Zinc with a value of 2.5.
A fundamental object that is difficult to divide into smaller bits is known as an element. An element is a substance that cannot be broken down by non-nuclear reactions in chemistry and physics. The elements are boron and oxygen, and their numbers are 1 and 2.
A pure material known as an element is made up of just one type of atom and cannot be divided into two or more different substances. A compound is a pure substance that is created when two or more substances are mixed in a specific mass ratio.
Chemistry's fundamental building block is an atom. It is the smallest fraction of matter into which electrically charged particles cannot be released. It is also the smallest piece of substance with chemical element-like characteristics.
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B. Divide
The earth's plates move, slide alongside one another, pull apart, or collide. Therefore, option (A) is correct.
If two tectonic plates of the earth collide there is the formation of a convergent plate boundary. One of the converging plates will usually move beneath the other is called subduction.
The fluids are released from the rock as the sinking plate moves deeper into the mantle, causing the overspreading mantle to partially melt. The new magma rises and forms volcanoes.
When two plates are pulling apart from each other, it is a divergent plate boundary. The magma rises from deep within the Earth along these boundaries and forms a new crust on the lithosphere. Most divergent plate boundaries form submarine mountain ranges known as oceanic spreading ridges and are underwater.
Another type of plate boundary that occurs when tectonic plates slide alongside one another is known as a transform plate boundary. As the earth's plates rub each other, large stresses can cause the rock to break, resulting in earthquakes.
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B. The first electron shell holds 8 electrons.
C. All atoms contain two electron shells.
An electron's exact position cannot be pinpointed is the features of the electron cloud model of an atom. Therefore, option A is correct.
In 1926, Werner Heisenberg and ErwinSchrödinger created the electron cloud model. The model is a tool for aiding in the visualization of the electrons' most likely location within an atom.
The electron cloud model is another name for the contemporary theory. This is due to the fact that each orbital surrounding an atom's nucleus resembles a fuzzily arranged cloud.
According to definition, an electron cloud is the area around the nucleus of an atom where electrons are most likely to be found.
Thus, option A is correct.
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Answer: a
Explanation: