which families of metals are not so reactive, which allows them to exist by themselves in nature?

Answers

Answer 1
Precious metals (silver (Ag), gold (Au)) and platinum metals (ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), platinum (Pt)) are extremely nonreactive, they are very stable and can be found in nature in elementary form. Poor reactivity of these metals originates from the fact that their atoms are significantly smaller than the alkali metal atoms, so their valence electrons are much closer to the atomic nucleus and are more firmly attached to it. That is why they have higher values of the ionization energy than alkali metals.
Answer 2

Answer:

precious metals


Related Questions

How many amino acids would be made from the strand in question 2

Answers

So remember, transcription is DNA to RNA. The coding for that is T=A, A=U, C=G, G=C. So your coding would be AUGGGGCUC.
For question three you’d have 3 amino acids. Remember that one amino acid is made of 3 letters, or codons. So if you divide your stand up you’ll get 3. 3 amino acids. Hope this helped.






What strand of mrna would be produced from the strand of dna shown below?gct aag?

Answers

I believe the strand of mRNA that would be produced will be CGA UUC. mRNA is formed from the process of transcription which takes place in the nucleus where DNA molecule acts as primer, catalyzed by the enzyme RNA polymerase. One of the differences between DNA and RNA is that the nucleotide base Tyamine (T) is replaced by uracil (U) when forming RNA molecule. 

The conjunction fallacy describes how people are more likely to think _____ than that _____. two events occur together; either individual event occurs separately individual events occur separately; four events occur together two events occur separately; four events occur together individual events occur separately; the two events occur together

Answers

The conjunction fallacy describes how people are more likely to think two events occur together than that either individual event occurs separately. Conjunction fallacy is a theory that assumes people are more willing to take risks so as to avoid losses than to achieve gains. It occurs when we assume specific conditions are more probable than a single one.

PLEASE HELP
If scientists were trying to construct recombinant DNA molecules, how would they do it?


by combining the RNA of two different organisms

by combining the proteins from two different organisms

by combining the DNA of two different organisms

by using RNA from plants

Answers

I'm pretty sure it would be by combining the DNA of two different organisms

Answer: Option C

Explanation:

The term recombinant DNA technology refers to combination of DNA from two different organisms. The gene of interest from the desired organism is incorporated into the bacterial cell.

When the bacterial cells replication, the gene of interest is also replicated along with the bacterial DNA.

There are many products which is produced for serving the society like medicines, enzymes, chemicals et cetera.

This technique allows us to have a huge amount of product in the very small period of time as the replication rate of bacterial species are very high.

Lymphoid tissue that appears as a swelling of the mucosa in the oral cavity is called a(n) _____________ .

Answers

There are choices for this question namely: 

A) tonsil
B) thymus
C) Peyer's patch
D) appendix

The correct answer is "tonsil". Tonsils are lymphoid tissue that is found in the oral mucosa. The tonsils are arranged in a ring-like fashion called the Waldeyer's ring. This ring comprises of two tubal tonsils, two palatine tonsils, one adenoid tonsil, and one lingual tonsils. In cases of infection involving the oral mucosa and the pharynx, the tonsils become inflamed as well and the condition is called acute tonsillopharyngitis.

Help please asap be very thankful

Answers

It is probably the type of environment they live in

in a strike-slip fault, the rocks on either side of the fault slip past each other sideways with little a. noise. b. shaking. c. up-or-down motion. d. movement.

Answers

C. They have little up-or-down motion; mainly just lateral motion is taking place
i think it is c. up-or-down motion

In pea plants, yellow seeds (y) are dominant to green seeds (y) and round seeds (r) are dominant to wrinkled seeds (r). the genes for seed color and seed shape are on different chromosomes. two true-breeding parents, one with yellow round peas and the other with green wrinkled peas, are crossed. what are the genotypes of the parents, and what kind of gametes will they produce?

Answers

This can be most efficiently answered using a Punnett square for crossing between YYRR and yyrr  (true breeding parents, so homozygous)

               yyrr
YYRR    YyRr        
So the only possible genotype of offsprings is YyRr, and the phenotype are yellow and round.

Final answer:

The true-breeding parents of yellow round peas and green wrinkled peas have genotypes RRYY and rryy, respectively. They will produce RY and ry gametes and all F1 offspring will display the yellow round seed phenotype with a genotype of RrYy.

Explanation:

In pea plants, the genotype for yellow round seeds is RRYY, where 'R' represents the dominant round trait and 'Y' represents the dominant yellow color. The green wrinkled seeds have the genotype rryy, where 'r' is the recessive wrinkled trait and 'y' is the recessive green color. When these two plants are crossed, the genotypes of the parents would be RRYY (yellow round) and rryy (green wrinkled). Because these are true-breeding plants, they are homozygous for their respective traits.

The gametes produced by each parent will reflect one allele for each trait. The round yellow parent (RRYY) will produce gametes with the RY allele, and the green wrinkled parent (rryy) will produce gametes with the ry allele. When these gametes combine during fertilization, all the F1 offspring will have the genotype RrYy, which are dihybrids, displaying the dominant phenotype of yellow round seeds.

The solute most abundant in phloem sap is _____. see concept 36.5 (page 797) the solute most abundant in phloem sap is _____. see concept 36.5 (page 797) amino acids minerals sugar hormones water

Answers

sugar
since phloem transports food in plant
Final answer:

The most abundant solute in phloem sap is sugar, specifically sucrose. This sucrose is transported from source cells into companion cells and then into sieve-tube elements, creating a flow from source to sink.

Explanation:

The solute most abundant in phloem sap is sugar, specifically sucrose. Phloem sap is an aqueous solution that contains up to 30 percent sugar, alongside minerals, amino acids, and plant growth regulators. Sucrose is actively transported from source cells into companion cells and then into the sieve-tube elements. This reduces the water potential, which causes water to enter the phloem from the xylem, thereby increasing pressure and causing the bulk flow of phloem from source to sink. Unloading at the sink end of the phloem tube occurs by either diffusion or active transport of sucrose molecules from an area of high concentration to one of low concentration.

Learn more about Phloem Sap here:

https://brainly.com/question/32574334

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Fossil fuels are formed by the decomposition of dead plants and animals which flow chart describes the correct energy transformation when a car burns fossil fuels to accelerate

Answers

Final answer:

Fossil fuels are sources of stored solar energy that, when burned in a car engine, undergo a transformation from chemical energy to thermal, then mechanical, and finally kinetic energy, in accordance with the law of conservation of energy.

Explanation:

Fossil fuels, such as coal, oil, and natural gas, are energy sources with a high hydrocarbon content that have formed in the Earth's crust from the anaerobic decomposition of dead plants and animals over millions of years. The transformation process involved in the formation of these fuels includes the conversion of the energy from sunlight into vegetation, followed by chemical changes due to high pressures and temperatures over geological times without oxygen.

When a car burns fossil fuels to accelerate, the correct energy transformation flow chart would show the following sequence: chemical energy from the fuel is first transformed into thermal energy due to combustion. Then, this thermal energy is converted into mechanical energy by the engine, which ultimately leads to kinetic energy as the car accelerates.

According to the law of conservation of energy, energy is never lost but merely changed from one form to another. This is evident in the process of fossil fuel combustion in car engines, where the ancient solar energy stored in these fuels is released and transformed to power the vehicle.

Which of the following statements characterizes an excitatory neuron?

It sends an impulse back to the cell body of a neuron.
It helps carry an impulse to the next neuron.
It stops the passage of an impulse at a neuron.

Answers

It sends an impulse back to the cell body of a neuron

Final answer:

An excitatory neuron facilitates the transfer of an impulse to the next neuron by releasing neurotransmitters at synapses, which then activate the subsequent neuron, enabling transmission of the neural signal.

Explanation:

Characteristics of an excitatory neuron include its ability to facilitate the movement of an impulse to the next neuron. This is achieved by the release of neurotransmitters at the synapse, which carry the nerve impulse from one neuron to another. Within a neuron, the dendrites receive incoming signals and transfer the impulse to the soma (cell body). The axon hillock then integrates these signals and if the threshold of excitation is met, an action potential is generated. The axon carries this action potential away from the cell body towards other cells, ultimately reaching specialized endings called axon terminals where neurotransmitters are released. These neurotransmitters then bind to receptors on the dendrites of the next neuron, opening ion channels, allowing for the continuation of the impulse.

Which of the following do not require enzymes to break them down to smaller units before being absorbed?

Answers

There are choices for this question namely:

proteins
starches
disaccharides
monosaccharides

The correct answer is "monosaccharides". Monosaccharides are the most basic form of sugar that can be absorbed in the gastrointestinal tract. When we consume carbohydrates in the form of complex carbohydrates (i.e. starch) it needs to be acted upon by enzymes (initially, amylase) to break it down to smaller dextrans and disaccharides. Disaccharides will be further broken down by disaccharidases in the intestines to monosaccharides for them to be absorbed.

Proteins are acted upon by pancreatic enzymes to break it down to smaller peptides.

What is the process in which immigrants are absorbed into the larger host society?

Answers

The process is called Cultural Assimilation

According to the dichotomous key, in what way(s) is the house sparrow similar to the cobra?

Answers

D) Both are bot a mammal, are multicellular, and are heterotrophic.

One ozone molecule contains three _____ of oxygen.

Answers

One ozone molecule contains three atoms of oxygen.

Ozone (O3) is a triatomic molecule consisting of three oxygen atoms. Ozone is an allotropic oxygen modification that is much more unstable than the usual dual-atomic form, O2. O3 is generally present in the Earth's atmosphere: in layers of soil it is one of the most dangerous contaminants with harmful effects on the lungs; ozone in the upper layers of the atmosphere prevents the penetration of harmful ultraviolet rays to the Earth's surface.


Ozone consists of three oxygen atoms, for a total of 18 valence electrons. These can be equivalently distributed in two ways:

Which of the three types of viruses shown above would you expect to include glycoproteins?

Answers

The viruses labeled with I and II in the picture presented below have a viral envelope, an outer layer of the viral particle that contains various glycoproteins.
These structures on the envelope are key factors in virus-cell recognition and viral infection of the cell. 
The correct answer is D: I and II only.
Viruses have protein capsids, which protect their genetic material. This capsid sometimes is covered by viral envelopes which have glycoproteins on their surface. Glycoproteins help in the process of binding to the host cell and infecting it. In this example, virus III has the structure of a bacteriophage and it does not seem to have glycoproteins. Bacteriophages use their tail fibers to attach to the bacterial host and inject their genetic material. On the contrary, viruses I and II have glycoproteins sticking out of their envelopes.

The patient is scheduled to have an eeg to confirm the presence of a sleep disorder. the patient asks the nurse to describe stage iv nrem sleep. what is the best response by the nurse?

Answers

The best response by the nurse is, this is the deepest stage of sleep and without it, you will be tired and depressed. In addition, an electroencephalogram or as called as (EEG) is a noninvasive test that registers electrical configurations in the brain. The examination is used to diagnose circumstances such as confiscations, epilepsy, head damages, faintness, headaches, brain tumors and sleeping disorders. It can also be used to settle brain bereavement.

Which type of selection is illustrated by these two graphs?

Answers

Hello!

The type of selection which is illustrated by these two graphs is a Stabilizing Selection

Among the different types of Natural Selection. Stabilizing Selection is the one that happened to the parrot population in the rainforest in Costa Rica. This is characterized by the selection against the extremes of an attribute and reinforcement of the mean, that's why this type of selection is also called Selection towards the mean.

In this case, there was selection against the parrots with colored feathers other than green that didn't help them to camouflage in the rainforest. 

Have a nice day!


Answer:

stabilizing

Explanation:

i just took this.

the coarse adjustment knob may be used in focusing with all objective lenses?
True or False

Answers

False. The coarse adjustment knob may be used in focusing with low power objective lenses.

This answer would be True

Mr. Burns, a retired neighbor of Roger's, is angry at Roger for playing loud music. Roger, who is 9 years old, notices that it is 10:30 AM and decides that Mr. Burns does not like to be interrupted while watching 'The Magic Donkey' superhero program on television, which only comes on during this time slot. Roger decides to do an experiment over the next two weeks and record his findings. To test this hypothesis, Roger could do all of the following EXCEPT?
A)Repeat his behavior at 10:30 AM for the next two weeks and record his findings.B)Bring Mr. Burns his mail at 10:30 every day.C)Play loud music at precisely 2:30 in the afternoon for two weeks.D)Interrupt Mr. Burns at 10:30 AM for the next two weeks by mowing the lawn.

Answers

The answer would be: C)Play loud music at precisely 2:30 in the afternoon for two weeks.

All other option is involving an action at 10.30 AM which the only times  'The Magic Donkey' is aired on the television. If Roger wants to prove the hypothesis, he should do the experiment when  'The Magic Donkey' is aired, not before or after it.

A jaguar that eats it's prey and then bounds across the rainforest after another possible meal is representing the characteristic of obtaining and using energy. T/F

Answers

True. He obtains energy then uses it to get more.








The nurse is caring for a client with nursing diagnosis of ineffective tissue perfusion. which area of the heart would the nurse anticipate being compromised?

Answers

The right ventricle of the heart the nurse should anticipate. Occasionally, circumstances happen where this altercation of gases among the blood and the cells is disturbed in which the cells and ultimately the tissues and organs stop receiving adequate oxygen source. The body cannot function in deprived of oxygen that is clearly a problem. As soon as tissues do not obtain sufficient oxygen over the capillaries, this will result to ineffective tissue perfusion.

Final answer:

In cases of ineffective tissue perfusion related to the heart, the myocardium is most likely to be compromised due to conditions such as heart failure or ischemia caused by narrowed or blocked coronary arteries. This can result in inadequate oxygenation, cell death, and severe impairment of heart function.

Explanation:

When a nurse is caring for a client with an ineffective tissue perfusion nursing diagnosis, it implies that a certain area of the heart is not receiving an adequate blood supply, which could be due to heart failure or ischemia. The heart muscle that is most likely to be compromised is the myocardium, particularly the regions supplied by the narrowed or blocked coronary arteries.

Heart failure occurs when the heart can't pump with sufficient force to meet the body's needs, leading to inadequate oxygenation of tissues, which can result in cell death and severe impairment of heart function. Cardiac muscle, composed of cells with endoplasmic reticula, requires proper functioning to manage calcium ions and ensure adequate contractile force; thus, any impairment in this system can lead to heart failure.

Furthermore, the heart's ability to appropriately allocate resources and oxygenated blood during various states of activity is essential for maintaining cardiovascular homeostasis. When an immunocompromised individual, such as a patient with chronic myelogenous leukemia, experiences additional stress or illness, this can exacerbate heart function and lead to further complications due to the limited regenerative capacity of the cardiac muscle tissue. Ultimately, untreated heart failure can lead to the failure of other organs and severe systemic effects.

Small secondary lymphoid organs, which cluster along lymphatic vessels, are termed ________.

Answers

Lymph nodes. They comprise the lymphatic system that connects to the blood circulatory system.  They are significant in the immune system. At the lymph nodes, foreign bodies in the lymph, such as pathogens, are filtered and trapped in lymph nodes where they are later destroyed by lymphocytes.


If you were standing under the tree which object would appear to be moving

Answers

the leaves would appear to be moving

________ is a compound stored in the muscles to replenish atp stores.

Answers

Creatine phosphate is a compound that is stored in the muscles to replenish atp stores. 

Which of the following would describe Lamarck’s ideas about evolution? Horses and zebras are similar. They have a common ancestor.

A mouse loses its tail in a fight. Its offspring will not have tails.

Wolves eat most of the rabbits in a field. A few smart rabbits find hiding places. They survive and reproduce.

Answers

The second statement: 'A mouse loses its tail in a fight. Its offspring will not have tails' best describes Lamarck’s ideas on evolution. Lamarck believed that traits developed during an individuals lifetime would be passed on to the individuals offspring. This is on contrast to Darwin's theory of Natural Selection: Individuals with a competitive edge within a population are more likely to survive and reproduce, thereby passing their genes explaining that particular phenotype to the next generation.  

Answer:

A mouse loses its tail in a fight. Its offspring will not have tails.

In pea plants, yellow seeds (y) are dominant and green seeds (y) are recessive. a pea plant with yellow seeds is crossed with a pea plant with green seeds. the resulting offspring have about equal numbers of yellow and green seeded plants. what are the genotypes of the parents?

Answers

To get the result of having 50% of recessive phenotype (green seeds), it is necessary to have a homozygous recessive parent (yy) crossed with a heterozygous parent (Yy) in order to achieve the 50% Yy (yellow, dominant) and 50% (yy, green, recessive).

The Punnett square below illustrates the above result:
         y    y
Y     Yy  Yy
y      yy   yy

So we get 50% Yy(heterogous, yellow dominant) and 50% yy (homozygous recessive, green).
Final answer:

The parental genotypes for the pea plants are Yy for the yellow-seeded parent and yy for the green-seeded parent, which explains the equal numbers of yellow and green seeded offspring.

Explanation:

Understanding Parental Genotypes in Pea Plants

In pea plants, yellow seeds are dominant (Y) and green seeds are recessive (y). Given that a cross between a pea plant with yellow seeds and one with green seeds yields offspring with about an equal number of yellow and green seeds, we can deduce the genotypes of the parents. The parent with yellow seeds must be heterozygous (Yy) because they contribute both the dominant and recessive alleles. The green-seeded parent is homozygous recessive (yy) because green is the recessive trait and can only be expressed phenotypically when two recessive alleles are present.

To predict the genotypes and phenotypes of the offspring, a Punnett square analysis can be employed. In this scenario, the Punnett square would show 50% of the offspring having yellow seeds (Yy) and 50% with green seeds (yy), supporting the observation of equal numbers of yellow and green seeded plants among the offspring.

You are working in the emergency department of a regional hospital in rural kentucky. a patient is brought in by emergency medical technicians (emt's). their initial report is suspected meningitis because the patient has a headache and stiff neck. the emts add that the patient's meningitis symptoms appear rather mild – he still has neck movement, and the headaches are not severe. the patient's overall condition is poor, however. he is very thin, has dark spots on his face and upper body, and open bloody-looking eruptions on his lips. his fever is 104 0 f, and his blood pressure is low. he also has severe diarrhea. 1. what is the first step in determining if the patient has meningitis? 2. this test reveals the presence of very large cells that appear to be eukaryotic, surrounded by a large capsule. what is the probable diagnosis? name some other eukaryotic organisms that can cause meningitis symptoms. 3. what groups of people are at risk for this infection? 4. how is

Answers

 1.  Meningitis is an infection of meninges, the membrane that protects the brain. To prove there is an infection in the brain, you can take a specimen of cerebrospinal fluid by lumbar puncture. The sample can be examined microscopically (for the presence of bacteria and leukocyte) or chemically(by looking at the protein count).


2. Cerebrospinal fluid should be sterile so the presence of eukaryotic cells means that the patient is meninges infected by bacteria. The diagnosis probably is meningitis bacteria. The capsule indicates the bacteria is Neisseria meningitidis, make the diagnosis become meningococcal meningitis.
Meningitis could also caused by Listeria monocytogenes, Haemophilus influenza, Streptococcus pneumoniae, or a virus.

3. The site of infection of meningitis could be from blood or direct contact to the cerebrospinal fluid. 
Direct contact needs an open wound from the skull or the vertebrae that allow the invasion. Any accident that has enough force to fracture the skull be at risk.
Bacteria can spread from blood in case of sepsis. Immunocompromised patient has a higher risk. Children, incomplete vaccination and living in high-density community also increase the risk.

The complete set of genes that makes up a person's heredity is called
a. a genotype
b. deoxyribonucleic acid
c. an allele
d. a phenotype

Answers

Your answer would be A genotype. :)

Why is algae classified in the Protist Kingdom and not the Plant Kingdom even though they are photosynthetic? Research why some scientists feel they should be classified as plants.

Answers

Algae (Euglena) do photosynthesis as plants do. They also move around and eat, as do animals. But they are unicellular. In order to be classified as a plant or animal, an organism has to be multicellular, made of more than one cell. Since it is a unicellular organism with some plant and animal characteristics, it is called a protist. Plant cells have walls while algae does't have one, so it is a protozoan. Algae resemble the protozoa, so they are put into the Protist Kingdom. 
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