In the unit cell of galena, six square faces of equal size each form 90 degree angles with every adjacent face. What type of crystal system is this

Answer:

40 Thousands

Explanation:

This is a multiplication account. Although the value seems very high, you can first ignore the name "Thousands" by multiplying only the decimal numbers and adding "Thousands" at the end.

Thus:

10x4 = 10 + 10 + 10 + 10 ----> 40 Thousands

There are approximately 1.73 x 10^25 oxygen atoms in 7.20 moles of H2SO4. This is calculated by determining the number of oxygen atoms per mole of H2SO4 (4), then multiplying that by the number of moles (7.20) and by Avogadro's number.

The student is asking about the number of oxygen atoms in 7.20 moles of H2SO4. The molar mass of H2SO4 is approximately 98.09 g/mol and it is composed of two hydrogen atoms, one sulfur atom, and four oxygen atoms.

One mole of H2SO4 contains 4 moles of oxygen, so 7.20 moles of H2SO4 would contain 7.20 * 4, which equals 28.8 moles of oxygen. Since a mole of any substance contains Avogadro's number (6.022 x 10^23) of entities (atoms, in this case), 28.8 moles of oxygen atoms would contain 28.8 * 6.022 x 10^23 oxygen atoms.

Doing the math, we find that there are approximately 1.73 x 10^25 oxygen atoms in 7.20 moles of H2SO4.

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Particles move independently of one another and are widely spaced.

Independent Assortment is the second law of inheritanceTraits are passed from parents to offspring independently of one another.Independent assortment is random and occurs during Metaphase I of meiosis.There are two possible alignments for the chromosomes.Since the alignments are random and not assigned, genetic variation occurs.

The correct answer is D. carbon dioxide and water

f is the answer. Have an amazing day

Final answer:

If an object's mechanical energy is equal to its potential energy, the kinetic energy of that object is 0 joules because the total mechanical energy is the sum of kinetic and potential energy which must remain constant in the absence of non-conservative forces.

Explanation:

If an object's mechanical energy is equal to its potential energy (PE), this means that the object has no kinetic energy (KE) at that moment. We deduce this from the principle that the mechanical energy of a system is conserved in the absence of non-conservative forces, such as friction or air resistance. Therefore, if mechanical energy equals potential energy, then the equation KE + PE = constant simplifies to 0 + PE = constant, which indicates that KE must be 0 joules because all the mechanical energy is stored as potential energy.

The stone you're referring to is called "petrified wood."

Petrified wood forms when minerals, typically silica, replace the organic material in the wood over thousands or millions of years. This process, known as petrification, occurs when wood is buried underground in sedimentary layers where oxygen is limited, preventing decomposition. As groundwater rich in dissolved minerals seeps through the wood, it gradually replaces the organic components with minerals, preserving the original structure of the wood. The result is a fossilized form of wood that retains the texture, grain patterns, and sometimes even the cellular structure of the original tree. Petrified wood is prized for its beauty and is often used in jewelry, decorative items, and as a geological curiosity.

Completed version:

The stone that is mane when minerals harden in the mold of a living thing.

The unit m3 or cubic meters is used to measure volume in the International System of Units. Volume is the amount of space a three-dimensional object occupies.

The unit m3 or cubic meters is used to measure volume, not length, area, or time. Volume refers to the amount of space that a three-dimensional object occupies, which is measured in cubic units. In the International System of Units (SI), the standard unit of volume is cubic meters.

For example, if you have a box that is 1 meter long, 1 meter wide, and 1 meter high, its volume would be 1 cubic meter (m3).

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The unit m³ represents volume, which can be visualized as a cube with an edge length of 1 meter. The concept of a cubic meter also influences other derived quantities like density. Understanding volume extensively helps with tasks involving unit conversions.

The unit m³ (cubic meter) represents volume, not length, area, or time. It is measured as the product of three lengths. This is most easily visualized by imagining a cube with an edge length of exactly one meter. This cube, which has both length, width, and height of 1 meter, would occupy exactly one cubic meter of space. Figure 1.25 illustrates this concept by comparing different units of volume with relatable objects.

The concept of a cubic meter also relates to the physical quantity of density, which is the mass per volume and can be expressed in units like kilograms per cubic meter (kg/m3).

Derived quantities like volume can be expressed using SI base units such as this. Understanding the concept of volume, measured in cubic meters, helps with computational tasks, particularly those involving conversion between different units.

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Foodborne illness can be prevented by practicing good hygiene, safe food handling, and proper cooking techniques. This involves washing hands, cleaning cooking surfaces, storing food at correct temperatures, avoiding cross-contamination, and ensuring food is cooked thoroughly.

You can prevent foodborne illness by practicing good hygiene, safe food handling, and proper cooking techniques. Firstly, always wash your hands and clean your cooking surfaces before preparing food. Secondly, be sure to store food at proper temperatures. Perishable foods should be refrigerated and cooked foods should not be left out for too long. In addition, avoid cross-contaminating raw and cooked foods, so always use separate cutting boards and utensils. Lastly, make sure that your food is cooked thoroughly. Using a food thermometer to check meat and poultry can ensure that they are cooked to a safe temperature.

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A scientist might reject a scientific theory when contradictory observations are found, as scientific theories must be based on testable and falsifiable evidence that can withstand rigorous scrutiny.

Valid Reasons for Rejecting Scientific Theories

A scientist might reject a scientific theory for several valid reasons. However, the reason that aligns with the scientific method and process is the discovery of contradictory observations. When experimental results or observations do not support the theory or directly conflict with it, scientists must reconsider and potentially discard the current theory. This is because a central tenet of the scientific method is that hypotheses and theories must be testable and falsifiable. If evidence accumulates that contradicts a theory, the responsible scientific action is to refine or replace the theory to better reflect the evidence.

Theories are not discarded due to public opinion, religious opposition, or legal and institutional votes, as these are external to the empirical basis of science. Rather, scientific theories are constantly subjected to scrutiny and must withstand rigorous testing and confirmation from multiple independent sources. This iterative process ensures that scientific knowledge evolves and becomes more robust over time.

A chemical reaction includes two or more reactants and the products separated by an arrow.  The reactants are separated each other by a plus sign and the same in between the products.

A chemical reaction is the combination of two or more reactants or reacting species. Through effective collision,  they form products.

The reactants and products are separated each other by a right arrow. Let A and B the reactants and C be the product. Then, the reaction is written as below:

A + B [tex]\rightarrow[/tex] C.

Sometimes the reactions can be reversible where we can use a reversible arrow ' ⇄ ' which indicates that the products can in turn convert into the reactants.

Sometimes an equal sign is used to indicate the product side in a reaction but it is not scientific and an arrow is used more properly.

Therefore, the symbol used to separate reactants from each other r products from each other is a plus sign. Hence, D is correct.

To find more about chemical reactions, refer the link below:

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Final answer:

In a chemical equation, reactants are written on the left hand side and products on the right hand side. The arrow is used to indicate the direction of the reaction, and plus signs (+) separate individual reactant and product formulas.

Explanation:

A chemical equation uses symbols to describe a chemical reaction. In a chemical equation, reactants are written on the left hand side of the equation and the products on the right. The arrow is used to show the direction of the reaction. Plus signs (+) separate individual reactant and product formulas.

Final answer:

Crust forming on lava showcases how heat removal can induce a state change. Lava is defined as a molten rock that is from a volcano or from a fissure in the surface of the earth.

Explanation:

Crust forming on the surface of lava illustrates the principle that removing heat from a system may result in a change in state. As lava cools and solidifies on the Earth's surface, the heat is extracted from the molten rock, causing it to transition from a liquid state to a solid state, forming new crust. This process exemplifies how altering the thermal energy within a system leads to a change in the physical state of the material.

Acetic acid is highly soluble in water due to its polar nature, while olive oil's nonpolar properties result in low solubility.

Acetic acid is highly soluble in water due to its polar nature, allowing it to interact with water molecules through hydrogen bonding. On the other hand, olive oil is nonpolar and lacks the ability to form significant interactions with water, resulting in low solubility.

The presence of a carboxylic acid group in acetic acid facilitates its solubility in water by enabling hydrogen bonding with water molecules. In contrast, the predominantly nonpolar nature of olive oil limits its solubility in water due to a lack of interactions with water molecules.

Overall, the polar vs. nonpolar properties of acetic acid and olive oil play a crucial role in determining their solubility in water.