The image below is part of a computer-generated model representing covalently bonded nonmetal atoms arranged in a crystal lattice. Four small atoms are bonded to each large atom. The structure extends in every direction.
The covalent network solid represented by the model likely
A.
is hard and strong.
B.
has a low melting point.
C.
is an electrical conductor when in the molten state.
D.
is a good conductor of both heat and electricity.
Answers
Answer:
A: is hard and strong
Explanation:
The crystal lattice shown is that of silica, SiO2. For a single molecule of silica to form, the silicon atom would have to form double bonds with each oxygen. Instead, each atom of silicon forms a bond to four different oxygen atoms, each of which is bonded to another silicon atom. This forms a covalent network.
Covalent network solids have the following properties:
They are hard and strong.
They have high melting points.
They usually do not conduct heat.
Silicon dioxide is an electrical semi-conductor.
Hope this helped :)
The structure extends in every direction. The covalent network solid represented by the model likely is hard and strong. Thus option A is correct.
what is covalent network ?
The Covalent Network describes the progressive decentralization of Covalent toward both community-owned and community-run protocol, It has the capabilities like Big data tools compatible, Multi-chain compatible, Storage efficient, Network efficient etc.
Covalent network solids are hard and strong, high melting points, usually do not conduct heat, Silicon dioxide is an electrical semi-conductor.
Covalent networks are large, hard and three-dimensional arrangements of atoms which are bonded together by covalent bond , for example Boron, Carbon and Silicon all form covalent networks.
Thus option A is correct.
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Related Questions
A food handler reports to work with obvious yellowing of the eyes and skin. What should the person be checked for?
Answers
Answer:
Hepatitis A
Explanation:
Hepatitis A refers to a liver disease or infection that results in mild to severe illness in humans and it is typically caused by the Hepatitis A Virus (HAV).
Generally, the main cause of Hepatitis A is as a result of the ingestion of food or consumption of water that has been contaminated by the Hepatitis A Virus (HAV) or getting in direct contact with fluids from an infected person.
Some of the symptoms of Hepatitis A are loss of appetite, feverish conditions, itching, nausea, fatigue, diarrhea, dark-colored urine, malaise, abdominal pains, yellowing of white portions of the eyes and skin (jaundice).
Hence, if a food handler reports to work with obvious yellowing of the eyes and skin. The sickness or illness that the food handler should be checked for as an adult is Hepatitis A.
Hepatitis A is a viral infection, which affects the liver. The person with obvious yellowing of eye and skin should be checked for Hepatitis A.
Hepatitis A is a viral infection caused by the Hepatovirus A. The virus affects the liver, which may lead to mild to severe illness in the patient. The disease is caused by the consumption of contaminated food and water, personal contact with the infected person, and using used drugs with other persons.
Some of the symptoms of Hepatitis A are:
Yellowing of skin and eye stomach pain diarrheafevercolored stools and dark urineTherefore, the person should be checked for Hepatitis A as he exhibits the symptoms of the disease.
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Use the information from the article to answer the question.
Meteors
Which statements apply to meteors?
Meteors are bits of material falling through Earth's atmosphere.
Meteor showers are associated with asteroids.
Meteors create a streak of light.
The largest meteor found has a mass of 54,000 kg.
Meteor showers occur in the autumn and winter.
Answers
Answer:
Meteors are bits of material falling through Earth's atmosphere
Meteors create a streak of light
While meteors are associated w asteroids, meteor showers are more associated with comets
Meteor showers can occur when ever but there are annual showers that will occur ea yr
Answer:
1.Meteors are bits of material falling through Earth's atmosphere.
3.Meteors create a streak of light.
Explanation:
TRUST ME
plss answer it’s due in 5 min
Answers
Answer:
No they do not because the traits they have don't depend on their lives its the health they have.
Explanation:
Answer:
It can, because if the animal take example a bear was born with traits of short legs and small claws, he won't be able to run as fast or do as much damage to the prey if it caught up. then the bear will have a small chance of surviving due to the lack of food
Explanation:
Why was the Cherokee writing system important?
Answers
Answer:Cherokee was one of the first American Indian languages to have a system of writing devised for it—a syllabary, so called because each of the graphic symbols represents a syllable.
Explanation:
anatomy
1) Which of the following terms describes the body's
ability to maintain its normal state?
Answers
I need the anwser soon!!Which two statements describe what happens to energy during cellular
respiration?
O A Chemical energy is transferred to molecules of ATP and used to
carry out fe processes.
B. Some thermal energy is transformed into chemical energy-
C. Some chemical energy is transformed into thermal energy
D. Light energy is transferred to molecules of ATP and used to carry
out te processes
Answers
Answer:
the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP.
Explanation:
Looking at a slide of axillary skin under the microscope, you notice the presence of ________ glands that are absent on slides of the scalp.
Answers
Answer:
apocrine
Explanation:
Imagine that a biological anthropologist 10,000 years in the future is examining our fossil remains. The anthropologist notices that humans have broad incisors and molars with rounded cusps. How do you think the anthropologist would interpret these traits---what diet would these traits indicate
Answers
Answer:
They were frugivores
Explanation:
Frugivores are animals that mainly eat raw fruits, vegetables, roots, seeds, shoots, etc. Frugivores need to eat diverse fruits and succulent fruit-like vegetables to fulfill their nutritional requirements, although they can supplement this diet with flowers, nectar, small insects, etc. Among their adaptations for fruit consumption, frugivore teeth are clearly distinct, having broad incisors to peel tough fruit rinds. Moreover, these animals generally have long small intestines to digest the fruit.
A woman with type AB blood has children with a man who has type o blood. What are the chances they will have a child with type o blood?
25%
0%
100%
50%
Answers
Answer:
The chance of a woman with an AB blood type and a man with an O blood type having a child with O blood is 0%.
Explanation:
A mother with blood type AB (AB) will pass either antigen A or antigen B to the offspring, while the father with blood type O (OO) will not pass any antigen.
The result of an AB X OO cross would be
Alleles O O
A AO AO
B BO BO
For this reason, the offspring of this couple will be
Blood type A (AO) 50%. Blood type B (BO) 50%. Blood type O (OO) none.Heredity of blood type depends on the presence of surface antigens on the erythrocyte membrane. Blood type O occurs in persons whose red blood cells do not possess surface antigens A or B.
Surface antigens are what determine blood type, so :
The presence of antigen A determines blood type A. Blood type B depends on the presence of antigen B. Blood type AB has both antigens.Blood type O has no antigens, and for blood type O to manifest, it must have both alleles for O.
A mother AB and father O cannot have offspring with blood type O.
What percent of the trees cut down are used for something other than paper?
35%
b. 45%
C. 55%
d 65%
Please select the best answer from the choices provided
OO *
B
Answers
Answer: Google says 65%.
Explanation: Resources that can help you with these problems can be found on Quizlet.
Answer:
D 65%
Explanation:
no explanation available
I need help can someone plss help? It would mean alot
Answers
Answer: D Endoplasmic reticulum (ER)
Explanation: It moves proteins throughout the cell
PLEASE HELP I NEED THIS QUESTION ASAP :((
Cancer cells are body cells that do not function properly, leading to abnormal growth. Which process does not function normally in cancer cells?
1. Osmosis
2. Cell cycle
3. Photosynthesis
4. Cellular Respiration
Answers
Answer:
cellular corrert me if I am wrong
Explanation:
have a nice day baby
What kind of rock is shown in the picture ?
How do you know what type of rock it is ?
Answers
Answer:
Sedimentary
Because it is made is sediments
Explanation:
got it right , edge 2020
The picture shown here is of sedimentary rock. It is visible so because of the identification features of a rock as shown in the image.
What is the formation of rock making process ?The process is that the soil and the sand that gets accumulated and together with the mud gets collected in order to form a hard mass by the passing of time called as rock.
The kind of rock identification is done on the basis of rock identification aspects that are decided for each type of rock that has been kept under observation. In sedimentary rock, the grains and the displacement of rock grains together gives a larger or smaller appearances.
The types of layers and mud particles joined together along with the ripple marks that have been put together shows the marks on the rocks.
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Which is an example of water condensing?
O Apuddle disappearing on a hot summer afternoon
O Sweat forming on your forehead after you do a lot of exercise
Ice cubes melting when you put them out in the sun.
Dew forming on plants during a cold night.
PLEASE HELP
Answers
What is the “self”? When we say “myself” or “yourself” what are we referring to?
Answers
Answer:
when you say self you are to the body, so when you say myself you are basically saying my body, my awereness. And when you say yourself it means their body.
Explanation:
Answer:
yourself is said to another person and you say yourself mean you and my self also means you but not used the same way.
Explanation:
hope this helps.
Glad to help
Which organic molecule is made at the ribosomes?
Answers
Explanation: Briefly, the ribosomes interact with other RNA molecules to make chains of amino acids called polypeptide chains, due to the peptide bond that forms between individual amino acids. Polypeptide chains are built from the genetic instructions held within a messenger RNA (mRNA) molecule.
How are P waves and S waves alike?
A.)They twist and distort solid objects
B.)They are both fictional particles
C.)They travel in the same manner
D.)They travel through solids
Answers
Answer:
I think the answer is D.
What is the effect of the color of light (red, green, or blue) on how high plants grow?
1) Identify the IV:
2) Identify the DV:
3) Identify important CVs:
4) Write a hypothesis (fill in the format below; refer to the short reading on the next page for ideas for the because):
If , then , because .
5) Write a procedure that would help answer the experimental question.
Materials Needed:
Answers
Answer:
Explanation:
Why have lions adapted to have sharper teeth than cows
Answers
Answer:
Lions need to blend in their surrounding, but cows don't. ... What adaptation helps a camel to survive in the desert?
Explanation:
Help I’m way behind and I need to catch up somone help please
Answers
Answer:
Turquoise lakes, ancient forests, and Rocky Mountains
Explanation:
QUESTION 9
if a woman who is a carrier for Fragilex syndrome (an X-linked disorder) has children with a man who does not have the disorder, what chance do their
daughters have of being carriers of Fraglese
None
50%
25%
100%
Answers
Answer:
Daughters who are descendants of a woman carrier of Fragile X Syndrome and a healthy man will have a 50% chance of having or being carriers of the syndrome.
Explanation:
Fragile X syndrome has an autosomal dominant inheritance pattern, linked to the X chromosome. That is, someone with an altered X chromosome can either be a carrier or have the syndrome.
In this case, the mother is a carrier of the altered chromosome (X) while the father is neither a carrier nor has the condition (XY).
Cross X x XY
Alleles X Y
[tex]X^{f}[/tex] [tex]X^{f}[/tex]X [tex]X^{f}[/tex]Y
X XX XY
The couple has a 50% chance of having daughters, and of those daughters half (50%) have the chance of having an Xf chromosome, and being a carrier or suffering from the syndrome.
Which of the following is a true statement about replacement-level fertility?
A) It equals the average number of children a woman will give birth to during her child-bearing years.
B
It equals the annual number of live births per 1,000 people in a population.
с
It equals the natural increase of a population in one year.
D
It is found by subtracting the number of emigrants from the number of immigrants in one year.
E
It is greater in countries with high infant-mortality rates than in countries with low infant-mortality rates.
Answers
Answer: It is greater in countries with high infant-mortality rates than in countries with low infant-mortality rates.
Explanation:
Replacement level fertility is referred to as the total fertility rate at which a population is being replaced from one generation to another generation. It should be noted here that fertility rate here refers to the average number of children born that a woman has.
The Replacement level fertility rate in most countries is around 2.1 children per woman. The replacement level fertility is greater in countries with high infant-mortality rates than in countries with low infant-mortality rates.
The correct option is E.
Binding of ________________ to receptors (ligand-gated) on the sarcolemma at the neuromuscular junction is vital for depolarization of the muscle fiber.
Answers
Answer:
Binding of ACh (acetylcholine) to receptors (ligand-gated) on the sarcolemma at the neuromuscular junction is vital for depolarization of the muscle fiber.
Explanation:
It allows acetylcholine to be released into this synapse when an action potential hits a neuromuscular junction. Acetylcholine attaches to the nicotinic receptors localized on the post-synaptic membrane of the muscle fibre's motor end plate, a specialized region.
Hence , the answer is ACh (acetylcholine) .
I WILL GIVE BRAINLIEST Pretend you're riding the bus to school on a very cold and snowy day. List 3 different phases changes you might see along the way.
Answers
1. precipitation(the snow falling)
2. evaporation(water turning into vapor)
3.melting(snow turning the water)
While riding the bus to school on a very cold and snowy day three different phases changes you might see along the way are mentioned below:
1. precipitation(the snow falling)
2. evaporation(water turning into vapor)
3. melting(snow turning the water)
What is precipitation, evaporation, and melting?Evaporation is the process in which liquid changes in vapour or gas and it can be easily observed during hot summer days when there is raining and when wet clothes dry in the presence of sunlight. Evaporation is directly proportional to temperature and when rate of evaporation increases the temperature also increases.
Precipitation is the water that is falling from the sky and it occurs when a portion of atmosphere becomes saturated with water vapour.
Melting is the process in which solid is converted into liquid like ice cube converted into liquid water and this is one of the example of melting.
Therefore, the mentioned below are three phases changes :
1. precipitation(the snow falling)
2. evaporation(water turning into vapor)
3. melting(snow turning the water)
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What are the major causes for moving air masses in North America? Choose the two that apply
Answers
What is one role of the smooth endoplasmic reticulum
Answers
Answer:
I can give you 3:
1. synthesize lipids
2. metabolizes carbohydrates
3. detoxifies the cell
Explanation:
Hope this helps :)
Which organelle that plays a central role in the transport of new molecules from inside to outside the cell?
Answers
Answer:
The Golgi apparatus plays a central role in molecular transport after biosynthesis.
Explanation:
Transcription occurs in the nucleus during protein synthesis, followed by translation inside ribosomes. Then, new molecules join the endoplasmic reticulum to be folded and modified. In the Golgi, they are tagged and separated into lysosomes for export outside the cell.
The Golgi system comprises of several regions known as cisternae; they act as independent microenvironments where products requiring their own unique conditions are converted into new, stable biomolecules.
Which of the following fur colors are possible males? Choose all that apply Remember that the gene for white spots is on an autosome, and the gene on the X chromosome .
Answers
The fur colors which are possible are black, black and white, orange, orange and white.
What do you mean Autosome?An autosome may be defined as the gene in question is located on one of the numbered, or non-gender, chromosomes.
Here, the S genes for white spots are located on an autosome, while the O genes are located on the X chromosome. Hence, the resulting offspring possess the fur colors of black, white, and orange.
Therefore, the fur colors which are possible are black, black and white, orange, orange and white.
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The fur colours which might be viable are black, black and white, orange, orange and white.
Here, the S genes for white spots are positioned on an autosome, whilst the O genes are positioned at the X chromosome. Hence, the ensuing offspring own the fur colours of black white, and orange.
What do you suggest Autosome?An autosome can be described because the gene in query is positioned on one of the numbered, or non-gender, chromosomes.
Therefore, the fur colours which might be viable are black, black and white, orange, orange and white.
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What is water an example of
Answers
Answer:
Water as a Molecule and Compound
Explanation:
When two atoms form a chemical bond, they make a molecule. Hydrogen and oxygen are both elements, but they also normally exist as molecules consisting of two atoms (H2 and O2). Because hydrogen forms bonds with oxygen to make water, water is a molecule. Water is also a compound.
Explanation:
A liquid
H2O
What is the difference between the tissue and the organ?
Answers
Answer:
A group of cells working together is defined as a tissue and several tissues working together comprise an organ. ... The heart is used as an example of an organ which is made up from muscle and valve tissue.
Explanation: