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Answer:

Explanation:

If we have two solid samples, in order to identify what they are a series of ordered steps have to be performed.

1) The first thing to do is to observe the sample. If there is color it may indicate the presence of certain anions: for example if the sample is purple, it can be because of the presence of the permanganate ion (MnO₄⁻), if it is yellow it can be chromate ion (CrO₄⁻), if it is orange it can be the dichromate Cr₂O₇²⁻), etcetera. If the color of the sample is white we have no indication whatsoever.

2) Then we can use certain reactants to precipitate the cations of the sample. For example, we can add first HCN 3N to our sample. If there is precipitation, it means that the cations Ag⁺ or Pb²⁺ are present. If not, there are other cations and we must use a different reactant to precipitate them.

3) We then add H₂S to the sample (not adding it per se, but generating it heating thioacetamide with water). If we see a black precipitate, it can be because of the cations Pb²⁺, Bi³⁺ or Cu²⁺. If we see a yellow precipitate, it corresponds to Cd²⁺. If we do not see a precipitate, we need to add other reactant.

4) We add NaOH to the sample. If we see precipitate, it can be because of the the ions Fe³⁺, Ni²⁺, Co²⁺ or Mn²⁺.

5) We observe the color of this precipitate. If it is brown is Fe(OH)₃, if it is green is Ni(OH)₂, if it is pink is Co(OH)₂, and if it is white is Mn(OH)₂.

Se toma la muestra problema o alícuota y se añade HCl 2N. Con este reactivo precipitan los cationes del Grupo I ( Plata (I), Plomo (II) y Mercurio (I)): AgCl, PbCl2 y Hg2Cl2. Sobre el mismo embudo se añade agua de ebullición, quedando en el papel de filtro el AgCl y el Hg2Cl2; el Pb2+ puede identificar añadiendo KI, que origina un precipitado de PbI2 que se disuelve en caliente, que sirve para identificarlo mediante la llamada lluvia de oro.1​

Sobre el mismo papel de filtro se añade NH3 2N. En el papel de filtro si existe Hg22+ y se forma una mancha blanca, gris o negro, que es una mezcla de HgClNH2 y Hg0. En la disolución se forman Ag(NH3)2+, que se puede identificar con KI dando un precipitado de AgI amarillo claro.

Answer:

Explanation: ground water contamination is nearly

always the result of human activity. In

areas where population density is high and human

use of the land is intensive, ground water is especially vulnerable. Virtually any activity whereby

chemicals or wastes may be released to the environment, either intentionally or accidentally, has

the potential to pollute ground water. When

ground water becomes contaminated, it is difficult

and expensive to clean up.

To begin to address pollution prevention or remediation, we must understand how surface waters

and ground waters interrelate.

The water present underneath the Earth exterior between rocks and soil spaces is called groundwater.

The deliberate upsurge of contaminants in the water is called water pollution it modifies the natural rich environment of water microbiota and composition.

Human activities like the release of chemicals from industries and factories in water bodies result in water and soil pollution.

Chemical leakage from factories runoff adds to a water body at the bottom of hills impacting its quality.

The polluted water with chemicals will result in diseases and death of the microbiota of aquatic life and terrestrial organism consuming it.

Chemicals can also affect the soil environment by contaminating it.

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Answer:

Plankton use carbon to make carbonate (CO3) shells in the ocean. The shells sink and accumulate into layers of sediments and eventually rocks. Rocks are pushed deep into the earth and melt at subduction zones, dissolving the carbon. Volcanic eruptions release carbon dioxide into the atmosphere.

Explanation:

Answer:

The correct answer is - They did not repeat their tests multiple times

Explanation:

If a scientific process or practice which is fundamentally based on believes or idea that has no valid evidence and not proved scientifically, such type scientific process called Pseudoscience or the false science.

In this case, Both Dominic and Eva performed experiments and recorded different time periods by the same stopwatch for the same chemical reaction.

This could result in an error in the data they get and affect the conclusion or results. To avoid this experiment must be repeated to be sure of the result and eliminate errors.

Answer:

They did not repeat their tests multiple times

Explanation:

Answer:

Explanation:

Phosphorylation is an example of a post-translational modification of a protein. These modifications are covalently attached to the protein and can have significant effects on its function.

These affects include altering its activity, its binding to other proteins, and where it is found in the cell.

However, post-translational modifications do not affect the amino acid sequence of the protein.

Answer:

Can you provide a picture or some more context to your problem so I can help you?

The three types of specialized cells include:

Specialized cells are those cells that makes up organ systems of the body.

These cells are interdependent on other cells in the organism.

Their specialization enables them to carry out their functions efficiently.

Organelles are those membrane-bound structures that are found with each specialized cells.

But each specialized cell might need organelles in greater numbers than the generalized cell. These organelles include:

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Answer:

what it eats where it lives prey

Answer/Explanation:

Normal cell division is a very controlled process.

There are several checkpoints where the cell ensures the cell is:

However, cancerous cells proliferate uncontrollably. This is because they can bypass the checkpoints and divide without the necessary signals. This means cell division keeps occurring even when conditions are unfavourable and the DNA is damaged.

Answer:

Explanation:

I am the thing that goes bump in the night. The shadow-like figure all are too afraid to identify in their room. The silent stalker of your waking nightmares and lucid dreams. Do not worry, I can- but will not- hurt you. Your family, however, doesn't have such luck. Do not warn them that I will be following their every move, or it will lead to a grizzly fate for you and your bloodline. I hope that my message has given you closure for the events to come.

In the meantime, you can pray for your family. Maybe I'll have mercy.

The best procedure for a scientist to use in order to determine how many calories are in a certain food is burn the food and determine how much it raises the temperature of a known amount of water. Option C is correct.

When food is burned, it releases thermal energy in the form of heat. The amount of heat energy released can be measured by observing how much it raises the temperature of a known amount of water. This is because water has a specific heat capacity, which means it requires a certain amount of energy to raise its temperature.

By burning the food and using a calorimeter (a device used to measure heat), scientists can accurately measure the amount of thermal energy released. This energy can then be converted to calories, which is a unit of energy commonly used to measure the energy content of food.

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Answer:d

Explanation:d

Answer:

hi the answer is a)rain mixes with soil

have a nice day

Explanation:

Answer:

a Rain mixes with soil.

Explanation:

i took the test

Answer:

Binary fission-Binary fission, asexual reproduction by a separation of the body into two new bodies. In the process of binary fission, an organism duplicates its genetic material, or deoxyribonucleic acid (DNA), and then divides into two parts (cytokinesis), with each new organism receiving one copy of DNA.

Budding-Budding is a type of asexual reproduction in which a new organism develops from an outgrowth or bud due to cell division at one particular site. The small bulb-like projection coming out from the yeast cell is called a bud.

Fragmentation-Fragmentation in multicellular organisms is a form of asexual reproduction in which an organism is split into fragments. Each of these fragments develop into matured organism, full grown individuals that are genetically and morphologically identical to their parents. 

Parthenogenesis-

Parthenogenesis is a form of reproduction in which an egg can develop into an embryo without being fertilized by a sperm. Parthenogenesis is derived from the Greek words for “virgin birth,” and several insect species including aphids, bees, and ants are known to reproduce by parthenogenesis.

Explanation:

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Binary fission is defined as the process of asexual reproduction by a separation of the body into two new bodies. In the process of binary fission, an organism duplicates its genetic material, or deoxyribonucleic acid (DNA), and then divides into two parts (cytokinesis), with each new organism receiving one copy of DNA.

Budding has been defined as type of asexual reproduction in which a new organism develops from an outgrowth or bud due to cell division at one particular site. The small bulb-like projection coming out from the yeast cell is called a bud.

Fragmentation has been defined as the in multicellular organisms is a form of asexual reproduction in which an organism is split into fragments. Each of these fragments develop into matured organism, full grown individuals that are genetically and morphologically identical to their parents.

Parthenogenesis has been defined as the form of reproduction in which an egg can develop into an embryo without being fertilized by a sperm. Parthenogenesis has been derived from the Greek words for pure and several insect species including aphids, bees, and ants are known to reproduce by parthenogenesis.

Therefore, Binary fission is defined as the process of asexual reproduction by a separation of the body into two new bodies.

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Answer:

Not always.

Explanation:

Answer:  False

Explanation:

Answer:

Mutualism, commensalism and parasitism.

Explanation:

Interactions among the organisms such as fish, corals, lobsters, clams, seahorses, sponges, and sea turtles etc can be observe in  the reef environment. reef environment refers to the coral reef which are present in the underground ecosystem. It is made up of calcium carbonate that provides habitat or shelter to thousands of animals. Some behaviours are mutualism, commensalism and some are parasitism.

The reef depicts the interaction of various organisms such as crabs, lobsters and sponges. The reef environment is made up of corals. The reef is made on the deposits of calcium carbonate hence shelter bed for thousand of organisms

Thus they depicts mutualism, parasitism, and commensalism in the environment.

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The gas leaves the atmosphere as plants use it to make sugar.

Hence, D option is correct.

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Answer:

you didnt put the choices, give me the choices and I can tell you

Explanation:

Answer:

respritory and immune

Explanation:

took the test

Answer:  6. the first one ,the third one ,

Explanation:

7.immune or respitory since her breathing is fast

Answer:

Explanation:

Using renewable energy will always be better than fossil fuels.

This is because fossil fuels need a very long time to renew themselves. And we will run out of them long before they can renew themselves. Besides this, there is a more concerning and very alarming issue with using fossil fuels instead of other energy sources. Global warming and environmental destruction is a very big problem for us in the 21st century. The air is more and more polluted. Temperatures are rising and oceans are rising with them. We will lose the ability to grow food and raise animals in the future if we continue like this.

Answer:

They start to water because of the acid.

Answer:

A.nucleus

Explanation:

The control center of in a cell is called nucleus

Answer:

Bacteria can replicate approximately every 20 minutes by binary fission, which is a simple form of cell division. This level of replication will depend on the availability of nutrients and other suitable conditions, such as temperature.

Answer:

Specialised cells have a specific role to perform. Each specialised cell has a different job to do. They have special features that allow them to do these jobs.

Answer:

In some ways yes it could

Explanation:

The state of the rest of the world’s fisheries is far less pretty. Widespread overfishing and shrinking global fish stocks, rising health concerns associated with toxic contamination (including mercury and plastic) of wild fish, and increasing sustainability and health concerns around aquaculture are just some of the challenges now facing the global marine industry. As prominent US marine biologist Dr. Sylvia Earle told the UN in 2015, “The ocean is large and resilient, but it is not too big to fail.”  

That’s where “clean fish” come in. Without the ocean pillage or negative health impacts currently associated with captured and farmed fish, cell-grown fish can undoubtedly help ease some of the pressure on the world’s natural ecosystems. “We want to show the public we are doing this for the right reasons, and that we are working on clean fish primarily as a conservation issue” says Finless Foods’ Mike Selden. “Yes, fish is a high-value product. But I also think it is important people know we’re doing this as a conservation issue. Bluefin tuna species are on and off the threatened species list, partially because it’s so expensive. We can take the pressure off these increasingly rare and wild populations.”

Answer:

No.

Explanation:

No, the sunlight does not act as a limiting factor the same way it does in the ocean because the lake has lower depth as compared to ocean which is very deep i. e. more than 3000 meters where sunlight does not reach and we know that sunlight is very important for the survival of plants. Sunlight reach in the water about 1000 meters so plants can survive and do photosynthesis due to its low depth.

Acid rain will impact the crayfish population because acid rain decreases the pH of water and this lower pH causes death of the crayfish and also the food of crayfish and thus lower the population of crayfish due to unavailability of food..

Answer:

Zebra mussels negatively impact ecosystems in many ways. They filter out algae that native species need for food and they attach to--and incapacitate--native mussels. Power plants must also spend millions of dollars removing zebra mussels from clogged water intakes.

Explanation:

just did a testtt

Answer:

dendrite → cell body → axon → axon terminals

Explanation:

The pathway for information through neuron are dendrite → cell body → axon → axon terminals and this because Dendrite is the input zone of nerve cell where neuron can receive information from another nerve cell.

Cell body is the part of the neuron that contain nucleus and it is link to the dendrites and it send signals to the axon.

Axon is a long nerve cell that join the cell body at a terminal called axon hilock and this conduct electrical impulses.

Axon terminal contain synaptic vessicles and it is synapse to other terminal and it is the out put zone of neuron. It is the out put zone where information is expell out

Answer:

Your answer is C!

Explanation:

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