Heat energy is being continually added to the system by the hot plate. This causes the water molecules to change their motion

Answer:

Explanation:

This is because  the valence electrons are not "fixed in the outer shell" but the metallic bonded electrons flow freely around positive ions

The first four, then the first. Hope this helps!

The position of the moon at noon in San Diego depends on its phase and can be anywhere in the sky during the day.

When it is noon in San Diego, the position of the moon depends on its phase. The moon can be anywhere in the sky during the day as it orbits around the Earth. So, the moon could be above the horizon, below the horizon, or even directly overhead, depending on its position in its orbit at that specific time. It's important to note that the moon can be visible during the day as well, especially if it's a crescent or a half moon.

Approximately 1.57 grams of sodium (Na) and 4.82 grams of chlorine (Cl2) are needed to produce 4 grams of table salt (NaCl). This is based on the molar mass of the compounds and the stoichiometry of the balanced chemical equation.

To produce 4 grams of table salt, NaCl, the first step is to determine the number of moles in 4 grams of salt. Knowing that the molar mass of NaCl is 58.44 g/mol, we can do so by dividing the mass of the salt by its molar mass (4 g / 58.44 g/mol), giving us approximately 0.068 moles of NaCl.

Since the balanced chemical equation for the reaction is 2Na + Cl2 --> 2NaCl, it follows that the molar ratio between NaCl and Na is 1:1. Therefore, we need 0.068 moles of sodium (Na) to produce 4 grams of NaCl. Given that the atomic mass of Na is 23 g/mol, we multiply 0.068 moles by 23 g/mol to find that approximately 1.57 grams of sodium are needed.

For chlorine gas (Cl2), the molar ratio with NaCl is also 1:1. So, we need 0.068 moles of Cl2 as well. Given that the molar mass of Cl2 is 35.45 g/mol * 2 (since it's diatomic), we multiply 0.068 moles by 70.9 g/mol to find that approximately 4.82 grams of chlorine are needed. Therefore, it takes approximately 1.57 grams of sodium and 4.82 grams of chlorine to produce 4 grams of table salt.

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Answer:

A

Explanation:

Pure substances are substances made of only one compound, and mixtures, substances made of two or more compounds. To separate the compounds of a mixture, it can be used chemical or physical separation. For example, to separate sand and water it may be used as a filter, which is a physical separation. But if there are small particles in the water, maybe it would be necessary coagulation with some chemical element before a filtration, which would be a chemical separation.

To separate the elements of a pure substance, only chemical separations can be used: would be necessary a chemical reaction to form H2 and O2 from H20, for example. So, letter A is correct.

Letter B is incorrect because can be differents atoms in the mixture, depends on its components.

Letter C is incorrect because all molecules, compounds, and substances have chemical bonds, it's the force that let the elements be together.

Letter D is incorrect because, as explained, pure substances only can be separated in their elements by a chemical reaction.

Answer: Option (b) is the correct answer.

Explanation:

It is known that density is the amount of mass divided by volume.

When water is present in solid state that is, in the form of ice then its molecules arrange themselves in a rigid tetrahedral structure.

Due to this there will cage like spaces between the molecules of ice during the bonding. As a result, they occupy more volume and it is known that density is inversely proportional to volume.

Hence, ice has low density as compared to liquid state of water.

When water is present in liquid state, then its molecules are closer to each other and they are able to slide past each other. Hence, space between them is less therefore, lesser will be its volume.

As a result, liquid state of water will have more density.

Thus, we can conclude that water is different from other substances  because it is less dense as a solid than liquid.

Earth's rotation sets up a general circulation pattern from the poles to the equator. Uneven heating breaks it into six cells and deflects the surface winds.

or

Uneven heating sets up a general circulation pattern from the poles to the equator. Earth''s rotation breaks it into six cells and deflects the surface winds.

In low-mass stars that are dying, lighter elements and neutrons may combine to generate heavy elements. The collision of two neutron stars and strong supernova explosions are two other potential producers of heavy metals. Mercury is a heavier element than tin.

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.

Tin has a density of 7.31g/cm³ while mercury has a density of 13.534g/cm³. As a result, one cubic centimeter of tin weighs 7.31 g and one cubic centimeter of mercury weighs 13.534 g.

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the answer is glass 4

If the heat given off in the dissolving reaction is less than the heat required to break apart the solid, the net dissolving reaction is endothermic. The addition of more heat facilitates the dissolving reaction by providing energy to break bonds in the solid. This is the most common situation where an increase in temperature produces an increase in solubility for solids.

The use of first-aid instant cold packs is an application of this solubility principle. A salt such as ammonium nitrate is dissolved in water after a sharp blow breaks the containers for each. The dissolving reaction is endothermic - requires heat. Therefore the heat is drawn from the surroundings, the pack feels cold.

The effect of temperature on solubility can be explained on the basis of Le Chatelier's Principle. Le Chatelier's Principle states that if a stress (for example, heat, pressure, concentration of one reactant) is applied to an equilibrium, the system will adjust, if possible, to minimize the effect of the stress.  This principle is of value in predicting how much a system will respond to a change in external conditions.  Consider the case where the solubility process is endothermic (heat added). An increase in temperature puts a stress on the equilibrium condition and causes it to shift to the right.  The stress is relieved because the dissolving process consumes some of the heat. Therefore,  the  solubility  (concentration)  increases  with  an  increase  in  temperature.    If  the process is exothermic (heat given off). A temperature rise will decrease the solubility by shifting the equilibrium to the left.

Answer:

sugar i took the test

Explanation:

Answer:

It's sugar

Explanation:

I took the test, the answer is sugar and its not the rest of the choices because they all have something mixed with them, AKA not pure.

Answer is: mass.

Mass is a fundamental measure of the amount of matter in the object.  Kilogram (symbol: kg) is the base unit of mass in the International System of Units.  

The weight is the force of gravity on the matter.  It is affected by gravity.

Volume is the amount of space that a substance occupies.  It is affected by temperature.

Density is a measure of mass per unit of volume (for example grams per milliliter). It is affected by temperature.

Fruit batteries use the natural acids in fruits to generate electricity and are eco-friendly on a small scale. They have educational value but are not practical for large-scale energy needs. They're more environmentally friendly than traditional batteries with harmful chemicals.

Fruit batteries operate by using the natural acids present in fruit, such as citric acid in lemons, to conduct electricity. This is a result of a chemical reaction between two different metals inserted into the fruit (usually copper and zinc), which act as electrodes.

Fruit batteries are an innovative way to generate a small amount of electricity without the use of fossil fuels or other non-renewable resources, making them environmentally friendly on a small scale. However, for practical and large-scale energy needs, fruit batteries are not viable due to their low power output and the impracticality of using large amounts of fruit for significant electricity generation.

Despite this limitation, the concept of fruit batteries can be useful in educational settings where demonstrating the basics of electrochemistry is desired. They are also more eco-friendly than many traditional batteries, which often contain harmful chemicals and heavy metals that can pollute the environment when not disposed of properly.

The balanced equation for Aluminum reacts with lead II nitrate is: 2 Al + 3 Pb(NO3)2 → 2 Al(NO3)3 + 3 Pb

The balanced equation for the chemical reaction where Aluminum (Al) reacts with lead (II) nitrate (Pb(NO3)2) is :

2 Al + 3 Pb(NO3)2 → 2 Al(NO3)3 + 3 Pb

This reaction is a single displacement reaction. In this type of reaction, one element displaces another in a compound. In this case, Aluminum (Al) displaces lead (Pb) in the lead II nitrate compound.

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Answer : Cells cannot be as large as a cube because of the surface area to the volume ratio gets smaller as the cell size gets larger. So, if the cell grows beyond a certain limit, the cell contents will not be able to cross the cellular membrane that fast, to accommodate the increased cellular volume.

Also, cells are so small in size, so that they can maximize their ratio of surface area to volume. In that case, smaller cells will have a higher ratio which will allow more molecules and ions move across the cellular membrane per unit of cytoplasmic volume.

Therefore, cells are so small in size as they need to be quick to get the nutrients in and throw the waste out.

Answer:

is held in genetic material called DNA.

Explanation:

:)

by increasing the surface area of a solid reactant, this can cause the rate of a chemical reaction to rise. If you cut it into pieces or make it into powder when the surface area is increased more particles will be exposed

Final answer:

Greenhouse gases trap heat in Earth's atmosphere, contributing to the greenhouse effect which warms the planet. Gases like carbon dioxide and methane are key players in this process, as they reflect thermal energy back to Earth, increasing its average temperature and affecting the climate.

Explanation:

Greenhouse gases significantly impact climate by affecting the heat flow into and out of Earth's atmosphere. When the sun's energy reaches Earth, greenhouse gases such as carbon dioxide, methane, water vapor, nitrous oxide, and ozone, trap heat in the atmosphere. About half of the sun's radiation penetrates these gases and warms the Earth, which then re-radiates thermal energy back into the atmosphere. Greenhouse gases act like a reflective barrier, bouncing much of this thermal energy back to the Earth's surface, thereby warming both the surface and the atmosphere.

This warming is known as the greenhouse effect, and greenhouse gases are critical because they absorb and emit radiation. The more greenhouse gases present, the more heat is trapped, leading to an increase in Earth's average temperature. This process contributes to global climate change, as the accumulation of greenhouse gases from human activities enhances this natural warming effect.

Matter is anything that occupies space and has mass, and it can exist in various forms. Examples of matter include solids, liquids, and gases, which all have different properties. Matter can be found in everyday items like books, computers, food, and dirt.

Matter is defined as anything that occupies space and has mass. Solids, liquids, and gases are all examples of matter. Solids, such as a book or a computer, have a fixed shape and volume. Liquids, like water or juice, have a fixed volume but take the shape of their container. Gases, such as air, have neither a fixed shape nor volume. Other examples of matter include food, like an apple or a slice of bread, and dirt or soil. These examples demonstrate how matter can come in a variety of forms and can be found in our everyday lives.

It exists in various forms, and the three main states of matter are solids, liquids, and gases, each with distinct properties:

Solids: Have a definite shape and volume. The particles in a solid are closely packed and vibrate in fixed positions.

Liquids: Have a definite volume but take the shape of their container. The particles in a liquid are more loosely packed than in a solid and can move past each other.

Gases: Have neither a definite shape nor volume. The particles in a gas are widely spaced and move freely.

Additionally, matter can undergo phase changes, transitioning between these states under different conditions (e.g., melting, freezing, boiling).

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A coefficient is a number written in front of a chemical formula to represent the number of moles of a reactant or product in a chemical equation.

In a balanced chemical equation, the number that is written in front of the element or compound is called a coefficient.

A coefficient represents the number of moles of the reactant or product involved in a chemical reaction.

For example, in the chemical equation: 2H₂ + O₂ → 2H₂O, the coefficient '2' in front of the H₂O indicates that two moles of water are produced when two moles of hydrogen react with one mole of oxygen.

Answer:

sunlight oxygen and stones

The correct answer is:

flatworm

Explanation:

Ganglia is a bunch of nerves or a group of nerves outside the central nervous system.A flatworm has a very simple nervous system with two nerve cords moving down either side. It has two simple brains assembled ganglia, which are simple packages of nerves.

Explanation:

Neptunists: They believed that the rocks on the Earth were formed by crystallization of various minerals found in the early Earth's oceans. The theory of Neptunism was proposed by Abraham Werner in later part of 18th century.

In contrast to Neptunists, Plutonists (also known as Volacanists) believed that the rocks on the Earth were formed through magmatic or volcanic activity. These rocks then passed through a repeated cycling of deposition, weathering away, getting deposited at the sea bed and rising again. The theory of Putonism was proposed by Anton Moro in 1750.

Answer:

Glass, floor tile, wood, and sandpaper

Explanation: