What elements threaten our marine ecosystem? logging non-native species oil spills overfishing soil runoff weathering

The phenomenon when the partial positive and negative charges of water molecules are attracted to the negative and positive charges is called hydrogen bonding.

Hydrogen bonding occurs when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another. This creates an electrostatic bond between the molecules and results in a stronger intermolecular force than other dipole-dipole attractions.

As a result, hydrogen bonding is the strongest intermolecular force and is responsible for many of the physical and chemical properties of water, such as its high boiling point and surface tension.

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Answer:

Oxygen

Explanation:

From the periodic table, you can see that the atomic mass of Oxygen is 15.999 (16), however, Carbon's mass is 12.011 (12).

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the pressure in the balloon decreases- True

the pressure in the balloon increases- False

the volume of the balloon increases- True

the volume of the balloon decreases- False

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Centimeters and millimeters are both interconvertible units to measure length. The conversion factor is as follows:

1 centimetre = 10 millimetres

This means that if a copper wire is 180cm long, the wire would be;

180 × 10 = 1800mm long

Also, the number of 40 mm segments of wire that can be cut from the length is calculated as follows:

1800mm/40mm = 45

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Extrusion is the feature form at Earth's surface from the cooling of lava.

They are the ones that originate from a sudden cooling of the incandescent magma when it comes to the surface, which means that there is no time for crystals to form, either partially or totally.

Therefore, we can conclude that typical volcanic rocks are formed by the rapid cooling of lava and pyroclastic fragments.

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Answer:

A.

Explanation:

The proper way to grease a ground glass joint is to apply a thin line of grease to the inner part of the joint and then connect and turn the joint to distribute the grease, ensuring that the grease is visible in the properly greased joint.

A ground glass joint is commonly used in laboratory glassware to connect two pieces of glassware, such as a flask and a condenser, creating an airtight and leak-proof seal.

To ensure that the joint functions properly, it is essential to grease it before use.

The proper way to grease a ground glass joint is to first apply a thin line of high-vacuum grease or silicone grease to the inner part of the joint, making sure that it is evenly spread.

Then, connect the two pieces of glassware and turn the joint several times to distribute the grease evenly. Finally, inspect the joint to ensure that the grease is visible, indicating that the joint has been properly greased.

This simple procedure helps to prevent leaks and ensures accurate and precise laboratory experiments.

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I haven't taken biology in a few years, so I may be wrong, but to me it looks like mitosis, since it only divides once, and if I can see the picture correctly it looks like each cell contains the same amount of chromosomes, but I can't see the picture very well. If it helps here are some differences between meiosis and mitosis:

1. Cell Division

Mitosis: A somatic cell divides once. Cytokinesis (the division of the cytoplasm) occurs at the end of telophase.

Meiosis: A reproductive cell divides twice. Cytokinesis happens at the end of telophase I and telophase II.

2. Daughter Cell Number

Mitosis: Two daughter cells are produced. Each cell is diploid containing the same number of chromosomes.

Meiosis: Four daughter cells are produced. Each cell is haploid containing one-half the number of chromosomes as the original cell.

3. Genetic Composition

Mitosis: The resulting daughter cells in mitosis are genetic clones (they are genetically identical). No recombination or crossing over occur.

Meiosis: The resulting daughter cells contain different combinations of genes. Genetic recombination occurs as a result of the random segregation of homologous chromosomes into different cells and by the process of crossing over (transfer of genes between homologous chromosomes).

4. Length of Prophase

Mitosis: During the first mitotic stage, known as prophase, chromatin condenses into discrete chromosomes, the nuclear envelope breaks down, and spindle fibers form at opposite poles of the cell. A cell spends less time in prophase of mitosis than a cell in prophase I of meiosis.

Meiosis: Prophase I consists of five stages and lasts longer than prophase of mitosis. The five stages of meiotic prophase I are leptotene, zygotene, pachytene, diplotene, and diakinesis. These five stages do not occur in mitosis. Genetic recombination and crossing over take place during prophase I.

5. Tetrad Formation

Mitosis: Tetrad formation does not occur.

Meiosis: In prophase I, pairs of homologous chromosomes line up closely together forming what is called a tetrad. A tetrad consists of four chromatids (two sets of sister chromatids).

6. Chromosome Alignment in Metaphase

Mitosis: Sister chromatids (duplicated chromosome comprised of two identical chromosomes connected at the centromere region) align at the metaphase plate (a plane that is equally distant from the two cell poles).

Meiosis: Tetrads (homologous chromosome pairs) align at the metaphase plate in metaphase I.

7. Chromosome Separation

Mitosis: During anaphase, sister chromatids separate and begin migrating centromere first toward opposite poles of the cell. A separated sister chromatid becomes known as daughter chromosome and is considered a full chromosome.

Meiosis: Homologous chromosomes migrate toward opposite poles of the cell during anaphase I. Sister chromatids do not separate in anaphase I.

I can add the similarities between them if you need. This work is not mine, I got it from thoughtCo.

Good luck :)

The statements which describe some of the original ideas proposed about the universe during the big bang include:

This theory describes how the universe expanded from a single point to form the earth we are living in.

it states that the very dense and hot environment led to it thereby making it the most appropriate choice.

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its d because it has to be diagnoly to the right

Answer:

I think C

happy birthday to your brother though

When the dry ingredients of a cake are combined, the result is a mixture. Option 3.

In chemistry, mixtures are substances that are obtained by mixing two or more chemically different substances together with each substance maintaining its chemical identity. In other words, the components of a mixture are still chemically unique and can be separated by physical means.

Mixtures can be homogeneous or heterogeneous. Homogenous mixtures are mixtures in which the components are uniformly dispersed throughout the entire mixture. For heterogeneous mixtures, the components are not uniform throughout the mixture.

Thus, when the dry ingredients of a cake, such as flour, sugar, etc., are combined, what we are going to have is a mixture. Whether this mixture would be homogenous or heterogeneous will depend on the level of mixing. Whatever the case may be, the components can still be separated by physical means.

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When human body cells are placed in hypertonic solutions, water will flow out of the cells, causing them to shrink and potentially leading to cellular damage or death.

In isotonic solutions, there will be no net movement of water in or out of the cells, allowing them to maintain their shape and function properly. However, in hypotonic solutions, water will flow into the cells, causing them to swell and potentially leading to bursting or lysing. Therefore, the best option for human body cells is to be in an isotonic solution, which allows for proper cellular function and prevents any potential damage or destruction. In isotonic solutions, the solute concentration is equal both inside and outside the cell, maintaining cell shape and function. In hypotonic solutions, cells gain water due to the lower solute concentration outside, which may result in swelling and possible cell rupture. The best option for human body cells is an isotonic solution, as it allows cells to maintain their shape, function properly, and avoid damage caused by water loss or excessive swelling.

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Answer: C7H6Br2

Explanation:

i got it right on acellus

Out of the options provided, both H3PO4 (phosphoric acid) and HPO42- (hydrogen phosphate ion) are amphiprotic substances.

An amphiprotic substance is a molecule or ion that can both donate and accept a proton (H+ ion) depending on the reaction conditions. Let's analyze each of the options provided to determine which one is an amphiprotic substance.

a) PO43- (phosphate ion):

The phosphate ion has a negative charge of 3- and is not capable of donating a proton. It acts as a base by accepting protons to form acid-base conjugate pairs. Therefore, PO43- is not an amphiprotic substance.

b) H3PO4 (phosphoric acid):

Phosphoric acid is a triprotic acid, meaning it can donate three protons. In the following reactions, it acts as an acid by donating protons:

H3PO4 + H2O ⟶ H2PO4- + H3O+ (donates H+)

H2PO4- + H2O ⟶ HPO42- + H3O+ (donates H+)

HPO42- + H2O ⟶ PO43- + H3O+ (donates H+)

In these reactions, phosphoric acid donates protons to form the respective conjugate bases. Therefore, H3PO4 is an amphiprotic substance.

c) HPO42- (hydrogen phosphate ion):

The hydrogen phosphate ion can act as both an acid and a base depending on the reaction. It can accept a proton to form H2PO4- or donate a proton to form PO43-. Therefore, HPO42- is an amphiprotic substance.

In summary, these compounds are capable of both donating and accepting protons depending on the reaction conditions.

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Answer:

A radioactive isotope, also known as a radioisotope, radionuclide, or radioactive nuclide, is any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays.

Answer:

unstable

Explanation:

Answer:

measures in an experiment

The independent variable is also defined as the regressors or controlled variable. It is the variable which is thought to be the cause of some effect. The independent variable is the only factor that a scientist varies for different groups in an experiment. The correct option is A.

An independent variable is defined as the variable which is changed or controlled in a scientific experiment in order to study the effects on the dependent variables. It is known as the quantity which is being manipulated in an experiment.

Thus independent variable is option A.

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Answer:

salt is ionic bond and water is Polar covalent bond

Explanation:

Answer:1. A. The number of electrons equal to the number of protons

2. D. The electrons in an atoms outermost energy level

3. A. To obtain a full outer electron shell

4. C. Seven

5. C. It will give up electrons forming a positive ion

Explanation:

I use this app plenty, time to give back a little.

Therefore, number of electrons will be the same as the number of protons as regards neutral atom

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Answer:

200 n

Explanation:

For the burning of sugar, there is a molar internal energy change. For a comb calorimeter, w=0 because Delta V=0 and Delta E=q+w. So Delta

E = q.

Water may absorb a lot of heat energy because of its large specific heat capacity without boiling or even significantly changing its temperature. Water is a useful medium for heat exchange in calorimetry because of this.

Heat transfer rates to or from a substance are measured using calorimetry. Heat is transferred to do this using a calibrated item (calorimeter). Calculating the quantity of heat transmitted by the process under study requires using the temperature change recorded by the calorimeter.

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Answer:

Ionic Bonds - A bond between metal and nonmetal elements. Involves transferring electrons. Covalent Bonds - Also known as molecular bonds. A bond between two nonmetals

Answer:

ionic bonds

Explanation:

A bond between metal and nonmetal elements. Involves transferring electrons.

If a solid sample of copper is an excellent conductor of electric current, it is likely due to the presence of metallic bonds in the sample.

Good conductors are the materials which offer very low resistance to the flow of electric current.

Solid copper is a metal, and metals have metallic bonds. Metallic bonds are a type of chemical bond that occur between atoms of metallic elements. In a metallic bond, valence electrons of the metal atoms are delocalized and shared among all the atoms in metallic solid, creating "sea" of electrons that are free to move throughout the structure.

This gives metals their unique properties such as high electrical conductivity and ductility. So, if solid sample of copper is an excellent conductor of electric current, it is likely due to the presence of metallic bonds in sample.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: A solid sample of copper is an excellent conductor of electric current . Which type of chemical bonds are in the sample?

Answer:

A heatwave occurs when a system of high atmospheric pressure moves into an area and lasts two or more days.

Explanation:

In such a high-pressure system, air from upper levels of our atmosphere is pulled toward the ground, where it becomes compressed and increases in temperature.

The chemical formula of the gas is N2.

Relative effusion rate is the rate at which a gas diffuses through a pinhole compared to the rate at which another gas diffuses through the same pinhole at the same temperature. It can be used to determine the molar mass of an unknown gas when compared to a known gas.

Here is how to use relative effusion rates to find an unknown molar mass:

1. Determine the relative effusion rate of the unknown gas compared to a known gas at the same temperature.

2. Use the formula: MR1/MR2 = √(MM2/MM1)

3. Rearrange the formula to solve for the unknown molar mass (MM2).

4. Plug in the values and solve for the unknown molar mass (MM2).The chemical formula of the gas that has an effusion rate of 2.16 times that of Xenon (Xe) is N2.

Here's the working out:

1. Determine the relative effusion rate of the unknown gas compared to Xe gas :

Relative effusion rate = √(MM Xe/MM unknown)2.16 = √(131.29/MM unknown)2.16² = 131.29/MMunknown4.6656 = 131.29/MM unknown MM unknown = 131.29/4.6656MMunknown = 28.10 g/mol The molar mass of the unknown gas is 28.10 g/mol. The only homonuclear diatomic molecule with a molar mass close to that value is nitrogen (N2).

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The answer response are:

Lead is a metal that is commonly used in various applications, including protecting against radiation in dental x-rays and as a component in car batteries. The carbon family, located in Group 14 of the periodic table, includes elements such as carbon, silicon, and germanium. These elements have similar chemical properties and physical characteristics such as having four valence electrons, being non-metallic, etc.

Therefore, Some common uses of the carbon family include the production of semiconductors, alloys, and ceramics. Silicon, for example, is used in the production of computer chips and solar panels, while carbon is used in the production of graphite and diamond. Understanding the properties and applications of these elements can have important implications for various fields such as engineering, materials science, and environmental health.

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Answer:

The system will shift to the left producing more moles of gases trying to maintain the original pressure of the system

Explanation:

Based on LeChatelier's principle, a change in temperature, pressure, volume or concentration on a system result in an opposing change trying to maintain the initial equilibrium conditions.

In the reaction:

N₂(g) + 3H₂(g) ⇄ 2NH₃(g)

4 moles of gas reacts producing 2 moles of gas.

In a gas reaction, the system will try to maintain the total pressure.

If the volume of the container increases, the system will shift to the side of the reaction that has more moles of gases in order to maintain the pressure.

That means if in the reaction the volume of the container increase from 2.0L to 4.0L the system will shift to the left producing more moles of gases trying to maintain the original pressure of the system.

The action "Heat energy was retained and water vapor condensed." characterized Earth's earliest atmosphere (atmosphere I)

Earth's earliest atmosphere, also known as atmosphere I, was primarily composed of methane, ammonia, and water vapor. The heat energy from the young Earth's molten surface caused these gases to rise and cool, leading to the condensation of water vapor and the formation of oceans. This process is known as the "greenhouse effect," as the retained heat energy allowed for the formation of a hospitable environment for the emergence of life. Ultraviolet light from the sun also played a role in the formation of the atmosphere by breaking down water vapor into hydrogen and oxygen, but this was not the primary process that characterized atmosphere I.

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There are a total of 4 hydrogen atoms on the reactant side of the balanced equation.

On the reactant side of the balanced equation, there are no hydrogen atoms present.

The balanced equation for the reaction between calcium carbide (CaC2) and water is:

CaC2 + 2H2O → C2H2 + Ca(OH)2

In this equation, the reactant side consists of CaC2 and 2H2O. CaC2 does not contain any hydrogen atoms, while 2H2O represents two molecules of water, each containing two hydrogen atoms. Therefore, the total number of hydrogen atoms on the reactant side is 2 (hydrogen atoms in one molecule of water) multiplied by 2 (two molecules of water), which equals 4 hydrogen atoms.

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The states of matter are solids, liquids, and gases.

Basically, there are three states of matter. The matters are stated according to the arrangement of the particles.

The solid is tightly packed and the liquids are not rigid and have more movements in particles. Whereas the gas spreads around and the particles are very flexible.

The best example is when ice(solid) is heated it converts into water (liquid) and if water is boiled it converts into steam (gas).

The kinetic energy in accordance to states of matters are as follows:

(The kinetic energy is obtained from the motion of the object)

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To produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta. To determine the amount of pasta required to produce 1000 kg of fishmeal, we need to consider the mass balance of the process. Let's break down the steps involved:

A. Extraction of fish oil:

The pasta obtained from the extraction stage contains 20% flour and 80% water. To calculate the amount of pasta, we need to determine the mass of flour and water in the pasta. Let's assume the total mass of the pasta is P kg.

Mass of flour = 20% of P = 0.2P kg

Mass of water = 80% of P = 0.8P kg

b. Drying of pasta:

During the drying stage, the pasta is dried in a rotary drum, resulting in fishmeal with 40% humidity. This means that the final fishmeal will contain 60% dry matter.

Let's assume the mass of the dried fishmeal is M kg.

Mass of dry matter = 60% of M = 0.6M kg

Since the dry matter in the fishmeal comes from the flour in the pasta, we can equate the mass of dry matter to the mass of flour:

0.6M kg = 0.2P kg

To produce 1000 kg of fishmeal, we want to find the corresponding value of P:

0.6M = 0.2P

P = (0.6M) / 0.2

P = 3M

Therefore, to produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta.

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