which step happens before mitosis? a. anaphase b. telophase c. interphase d. metaphase

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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Final answer:

The statements provided are related to genetics, the science of heredity and variation in living organisms. The true statements affirm that traits are passed on by genes, different genes control different traits, gametes have half the number of chromosomes as body cells, and a human gamete has 23 single chromosomes. A false statement is that a body cell and a sex cell have the same number of chromosomes.

Explanation:

True or False:

Traits are passed on by genes. TRUEDifferent genes control different traits. TRUEA body cell and a sex cell have the same number of chromosomes. FALSEGametes have half the number of chromosomes of body cells. TRUEA human gamete has 23 single chromosomes. TRUE

The subject of these questions is genetics, which is a key topic within biology. These statements address the fundamental concepts of heredity and chromosome behavior during the formation of gametes. Genes, located on chromosomes, are the heritable units that carry information for traits. Gametes, which are sex cells like the egg and sperm in humans, have half the number of chromosomes compared to somatic or body cells, ensuring that when two gametes merge at fertilization, the resultant cell has the correct diploid number of chromosomes. In humans, this diploid number is 46, with gametes having 23.

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.

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.

Elements are the simplest substances in nature that cannot be broken down into smaller parts by normal chemical means. They contain only atoms of the same type, ones that have identical chemical properties. There are at least 90 naturally-occurring elements, plus man-made ones. If you look at a periodic table, you'll see the names of each of these elements and some of their properties (such as mass, or how heavy the atom is).

Molecules & Compounds

When atoms from different elements are joined together in groups, they form molecules. The atoms in molecules bind together chemically, which means that the atoms cannot be separated again by physical means, such as filtration. The molecule has different properties from the elements from which is was made. A water molecule is not three separate atoms, two hydrogen (H) and one oxygen (O), but it is actually a unique H2O molecule with its own set of distinct properties.

Like elements that are formed of atoms of the same sort, compounds are formed of molecules of the same sort. The elements can be combined into about 2 million different compounds! Did you know that eggshells are made up of a calcium carbonate compound? And citric acid, which is found in oranges and other citrus fruit, is a compound of carbon, hydrogen, and oxygen atoms. Your kids might find it helpful to do a science research project finding other common compounds around your house. Make hypotheses and do research using a chemistry reference book, web site, or text book to find out the answers.

There are more carbon compounds than compounds of any other element. Organic compound is the name for the carbon compounds found in all living things.

Mixtures - A Bit of This and That

All matter can be classified into two categories: pure substances and mixtures. A pure substance consists of a single element or compound. Iron is formed only of iron (Fe) atoms; table salt is formed only of sodium chloride (NaCl) molecules. A mixture, however, is made up of different compounds and/or elements. When salt is added to water to make saltwater, it becomes a mixture. The salt and water molecules do not combine to form new molecules, but only "mix" together while still retaining their identities. Air is also a mixture, containing just the right amounts of nitrogen, oxygen, and other gases for life on Earth.  

Not all mixtures have the same composition throughout. Salt water does, but Italian salad dressing does not--the parts separate and are not perfectly blended or homogenous. Mixtures of metals are called alloys (bronze is an alloy of copper and tin); liquid mixtures (such as saltwater) are called solutions.

The substances that make up a mixture can be separated by physical means because they have different physical properties (such as different melting points) and are not chemically bonded. A mixture can be separated into its parts in a variety of ways, including decantation (letting the sand in a mixture of water and sand settle, and then draining off the water, for example), filtering, and evaporation. You can use a kitchen funnel and coffee filter for filtration, and either use sunlight or low heat for evaporation. Try out these methods on saltwater and a sand and water mixture to see how they work and compare the results. Evaporation will work for both saltwater and sand and water solutions, but filtration will not work for saltwater. Can you think of other examples where a separating method will work for one mixture and not another? Another one to try is lemon juice, a mixture of water and citric acid; what do you think happens when it is boiled? The water evaporates and eventually leaves nothing but citric acid crystals

A small set of elements combine in whole number ratios to form compounds with specific compositions, like glucose or water. Molecules are the smallest particles in compounds with consistent ratios of atoms. Mixtures, on the other hand, involve physical combinations of substances without fixed proportions.

How Elements Combine to Form Molecules, Compounds, and Mixtures

Atoms of different elements can combine in simple whole number ratios to form chemical compounds. These compounds have a specific composition and possess unique chemical and physical properties that distinguish them from other compounds. For instance, glucose, an essential body fuel, always consists of carbon, hydrogen, and oxygen in a fixed ratio: six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.

Two or more atoms join together to create a molecule, which is the smallest unit of a substance retaining its distinctive properties. A common example is a molecule of water, which is consistently made up of one oxygen atom and two hydrogen atoms, represented by the chemical formula H₂O. The consistent composition of a compound is represented by its chemical formula, indicating the fixed proportion of each element within it.

Apart from forming compounds, elements and compounds can also fabricate various mixtures. Mixtures are combinations of two or more substances that can be separated by physical means. In contrast to compounds, the components in a mixture do not combine in a fixed ratio.

In our daily lives, the elements from the periodic table combine in countless ways to form the compounds and mixtures we use every day, from the water we drink to the air we breathe, and the myriad of products we come into contact with.

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 answer is glass 4

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

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.

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.

Answer is: B.)The velocity of a car reduced from 50 km/h over one minute.

Ending velocity is defined as the velocity attained by a body after completing distance at certain time interval:

v(ending velocity) = v(initial velocity) + a·t.

a is acceleration attained by the body (in this examle car).

t is time (in this example one minute).

Because velocity is reduced, acceleration has negative sign.

An car average acceleration over a period of time is its change in velocity.

Answer: B

Explanation:

Progress Learning

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:

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.

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

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.

Answer:

Glass, floor tile, wood, and sandpaper

Explanation:

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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Answer:

is held in genetic material called DNA.

Explanation:

:)

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 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.