Use diffusion to explain what happens when you drop a sugar cube into a mug of hot tea. Explain

QUESTION POSTED AT 23/09/2019 - 04:23 AM

Answered by answersmine AT 23/09/2019 - 04:23 AM

When you drop a sugar cube into a mug of hot tea the sugar cube diffuses 
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Related questions

As you are cooking, your hand brushes up against a hot pan. You quickly pull your hand away. What type of stimulus is this?

Stimulus is something that causes a psychological response. It can be internal or external. The stimulus is the contact with the hot pan. It is an external stimulus. Sense organs, such as the sensory receptors in the skin are sensitive to external stimulus. The quickly pull of your hand is a reflex action.
The contact causes a nerve impulse that will travel to the spinal cord via the sensory neurons.To respond to the stimulus of the reflex arc, the muscle needs to contract to pull the hand quickly away from the hot pan.

ANSWERED AT 17/10/2019 - 09:10 AM


QUESTION POSTED AT 17/10/2019 - 09:10 AM

Explain how the forest follows law of conservation of mass and the law of conservation of energy.

Force I believe. Is it multiple choice?

ANSWERED AT 17/10/2019 - 08:28 AM


QUESTION POSTED AT 17/10/2019 - 08:28 AM

Explain the importance of shape to enzyme function

Enzymes are proteins that control the speed of chemical reactions in your body. Without enzymes, these reactions would take place too slowly to keep you alive. 

ANSWERED AT 17/10/2019 - 08:24 AM


QUESTION POSTED AT 17/10/2019 - 08:24 AM

The figure shown above shows the energy levels for a hydrogen atom. What is the energy of the photon emitted when the electron in a hydrogen atom drops from energy level E5 to energy level E2?

The energy of the photon emitted when the electron in a hydrogen atom drops from energy level E5 to energy level E2 is 2.85eV

Now, the energy of the ground state is -13.6 eV.
the energy of the first state (n = 1) is -3.39 eV.
the energy of the fifth state is -0.54 eV.

Now, When an electron drops from higher to lower state, then energy difference is same as the energy of the photon emitted, is
 = E5 - E2
= -0.54 eV -(-3.39 eV)
= 2.85 eV 

ANSWERED AT 17/10/2019 - 08:19 AM


QUESTION POSTED AT 17/10/2019 - 08:19 AM

When plants wilt they're soft stems and leaves begin to drop what is going on inside the plant cells that causes the plant to drop like this

The cell membranes begin to come apart when there is insufficient water around the cells. The cytoplasm of the cells becomes more concentrated, which slowly poisons the cells. The cell walls become brittle as they dry out, and some of them collapse. The central vacuoles in the cells lose water and can no longer help support the cells.


The central vacuoles in the cells lose water and can no longer help support the cells

ANSWERED AT 17/10/2019 - 08:19 AM


QUESTION POSTED AT 17/10/2019 - 08:19 AM

You are in a desert on a hot day and see water in the distance. It's not really there, but results from refraction of light.

That is correct. Also known as a mirage

ANSWERED AT 17/10/2019 - 08:01 AM


QUESTION POSTED AT 17/10/2019 - 08:01 AM

DDT was widely used as a pesticide for 20 years. Its use was banned after studies showed severe side effects were evident in humans, the environment, and animals as a result of DDT. Which reason best explains why the side effects of DDT were so harmful? DDT kills insects and other pests. DDT decomposes. DDT was genetically engineered. DDT bioaccumulates.

Answer: DDT bioaccumulates

Dichlorodiphenyltrichloroethane (DDT), is a colorless, odourless and tasteless crystalline chemical compound used as insecticide or pesticide to kill insects in garden, agricultural land and grain storage firms. The use of DDT has resulted in the profound impact of biomagnification. DDT is toxic not only for insects but also for other living species. DDT remain undigested in the living organisms. It is passed in the undigested form from one organism to other organism, when one organism is consumed by other organism in food chain. In food chain the accumulation of DDT gets maximum at the higher trophic level. Hence, results in decline in population of large terrestrial and aquatic mammalian population, including humans.


ANSWERED AT 17/10/2019 - 07:52 AM


QUESTION POSTED AT 17/10/2019 - 07:52 AM

If organism change sunlight and carbon dioxide into the oxygen and sugars it need to make enegery it is

This is photosynthesis

ANSWERED AT 17/10/2019 - 07:19 AM


QUESTION POSTED AT 17/10/2019 - 07:19 AM

Explain two ways in which xylem is modified to carry out its function

The functions of xylem is to transport water, minerals, inorganic ions and other materials needed by the plant and to provide support for the plant. Xylem is adapted to its functions in the following ways:
1. The xylem tube containa a ring of lignin which form a spiral pattern around the xylem tube. Because lignin has high strength capacity, it helps to be a supportive structure for the plant. It also prevent the walls of xylem from collapsing under pressure caused by transpiration pull. 
2. Xylem is made up of water proof, dead cells; this enables it to have high capacity for transporting large quantity of water.

ANSWERED AT 17/10/2019 - 07:01 AM


QUESTION POSTED AT 17/10/2019 - 07:01 AM

Explain why some people are naturally resistant to infection by the virus that causes fifth disease

Fifth disease is a mild illness caused by a virus called human parvovirus B19. The medical name for fifth disease is erythema infectiosum (EI). This infection occurs primarily during winter and spring, most commonly in children between 5-14 years of age. Initially, fifth disease causes an erythematous (reddish) rash on the child's face appearing as though the child had been slapped on both cheeks. Sometimes in North America, the disease has been referred to as "slapped cheek syndrome" or simply "slapcheek." The characteristic appearance of the rash gave rise to the names "apple sickness" (or ringo-byou) in Japan and "butterfly pox" in Hungary (since the cheeks resemble the wings of a butterfly).

ANSWERED AT 17/10/2019 - 06:33 AM


QUESTION POSTED AT 17/10/2019 - 06:33 AM

Which explains why secondary succession generally occurs more rapidly in an area than does primary succession?

Secondary succession occurs where there are already a small set a species present, and thus biological life already been able to take a good hold on the area. On the other hand, primary succession occurs in an area devoid of life, and spores from fungi, bacterium or grasses can eventually generate a livable soil for larger plants, and later animals, to take foothold. An example of primary succession would be magma from a volcano sweeping over a large portion of a forest and suffocating all life.

ANSWERED AT 17/10/2019 - 06:29 AM


QUESTION POSTED AT 17/10/2019 - 06:29 AM

Aim :to investigate whether roots exert a pushing force strong enough to cause water to move up the stems of plants and explain five precaution to be considered during the setup of this experiment

1. The stem should be cut at least three to four inches above the ground surface level.
2. The stem should be fixed tightly into the glass capillary.
3. The connection should be made air-tight, using paraffin wax.
4. Initial and final mercury levels should be carefully noted.
5. The experiment should be preferably performed in the morning time. 

ANSWERED AT 17/10/2019 - 06:01 AM


QUESTION POSTED AT 17/10/2019 - 06:01 AM

Which explains how the greenhouse effect and greenhouse gases can cause problems with earth’s energy budget? A. The more greenhouse gases that are in the atmosphere, the more heat will be trapped. That means earth’s energy budget could be disturbed because the amount of heat radiating toward the surface is less than the amount of heat escaping from the earth. B. The more greenhouse gases that are in the atmosphere, the less heat will be trapped. That means earth’s energy budget could be disturbed because the amount of heat radiating toward the surface is greater than the amount of heat escaping from the earth. C. The more greenhouse gases that are in the atmosphere, the more heat will be trapped. That means earth’s energy budget could be disturbed because the amount of heat radiating toward the surface is greater than the amount of heat escaping from the earth. D. The more greenhouse gases that are in the atmosphere, the less heat will be trapped. That means earth’s energy budget could be disturbed because the amount of heat radiating toward the surface is less than the amount of heat escaping from the earth.

 C. The more greenhouse gases that are in the atmosphere, the more heat will be trapped. That means earth’s energy budget could be disturbed because the amount of heat radiating toward the surface is greater than the amount of heat escaping from the earth

ANSWERED AT 17/10/2019 - 05:35 AM


QUESTION POSTED AT 17/10/2019 - 05:35 AM

Explain how the digestive system works?

Digestion works by moving food through the GI tractDigestion begins in the mouth with chewing and ends in the small intestine. As food passes through the GI tract, it mixes with digestive juices, causing large molecules of food to break down into smaller molecules.

ANSWERED AT 17/10/2019 - 05:29 AM


QUESTION POSTED AT 17/10/2019 - 05:29 AM

Viruses are made up of either DNA or RNA surrounded by a coating of protein. when the two main substances that make up a virus are broken into smaller fragments, these fragments are A fatty acid and amino acids B amino acids and simple sugars C amino acids and nucleotides D fatty acids and glycerol

Answer:

C. amino acids and nucleotides

Explanation:

When the viruses will be broken down, the constituent particles will be left behind.

Since the viruses are made up of the DNA and proteins, only amino acids and nucleotide fragments will be there this is because the DNA is made up of nucleotides and the proteins are made up of amino acids.

Hence , the correct option is C.

ANSWERED AT 17/10/2019 - 05:13 AM


QUESTION POSTED AT 17/10/2019 - 05:13 AM

Explain when does water vapor in air condense

Water vapor+ x-y so basically x would be the rain and y would be the air

ANSWERED AT 17/10/2019 - 05:05 AM


QUESTION POSTED AT 17/10/2019 - 05:05 AM

A researcher has a plant that displays yellow flowers, the trait dominant over white flowers in the species. How might the researcher discover if his plant is heterozygous or homozygous yellow? Note: 1. State the name of the experiment and explain how it works. 2. Be sure to use fractions or percentages to explain the possible outcomes. 3. Use Punnett squares if needed. 4. Make sure your essay has an introductory sentence and a supporting paragraph.

In order to know whether the phenotype is homozygous or heterozygous, a test cross is performed. As only one character of flower color is being studied, the test cross will be a monohybrid one. For this, the plant will be crossed with the plant which has the recessive trait, i.e., white flower in this case. If the offspring has white colored flowers, then the parent was heterozygous. If the offspring bears yello flowers, the  the parent was homozygous for the dominant allele.  In this case, a ratio of 1:1 wil be obtained in the offsprings, which means half of the population will bear white flowers and half will have yellow flowers, because recessive allele will come from both the tested corssed parents nd will obviously produce white flower plants also. On the other hand, if the parent would have been homozygous for yellow flower, all of the offsprings in the test cross yould have been yellow flower bearing plants. 

ANSWERED AT 17/10/2019 - 04:53 AM


QUESTION POSTED AT 17/10/2019 - 04:53 AM

Suppose you are an astronomer, and a child asks you to explain how long it takes light to travel through space. In your own words, answer the child's question. Be sure to mention the speed that light travels in space, and provide a general idea of how long it takes the light from distant stars to reach Earth.

Light speed, or 300,000 kilometers a second, might seem like a speed limit, but this is just an example of 3 + 1 thinking – where we still haven’t got our heads around the concept of four dimensional space-time and hence we think in terms of space having three dimensions and think of time as something different.

For example, while it seems to us that it takes a light beam 4.3 years to go from Earth to the Alpha Centauri system, if you were to hop on a spacecraft going at 99.999 per cent of the speed of light you would get there in a matter of days, hours or even minutes – depending on just how many .99s you add on to that proportion of light speed.

This is because, as you keep pumping the accelerator of your imaginary star drive system, time dilation will become increasingly more pronounced and you will keep getting to your destination that much quicker. With enough .999s you could cross the universe within your lifetime – even though someone you left behind would still only see you moving away at a tiny bit less than 300,000 kilometres a second. So, what might seem like a speed limit at first glance isn’t really a limit at all.

To try and comprehend the four dimensional perspective on this, consider that it’s impossible to move across any distance without also moving through time. For example, walking a kilometer may be a duration of thirty minutes – but if you run, it might only take fifteen minutes.



Read more at: https://phys.org/news/2011-10-light-speed.html#jC

ANSWERED AT 17/10/2019 - 04:49 AM


QUESTION POSTED AT 17/10/2019 - 04:49 AM

Which statement describes a cell belonging to a haploid organism that is capable of reproduction? A) It has chromosomes that contain one polynucleotide chain. B) It is capable of carrying out a reduction division to form gametes. C) It possesses two copies of each gene as a result of fertilisation. D) It will undergo cell division by mitosis during asexual reproduction. The answer is D. Can anyone explain how?

From the options given above, the correct option is D. A haploid cell is a cell that contains a single set of chromosomes only. A haploid cell can only undergo asexual reproduction. Asexual reproduction involves only one parent and the cell division usually occurs by mitosis. An organism that is reproducing asexually will transmit 50% of its gene to its offspring[s]. Thus, haploid cells reproduce asexually through mitosis only. 

ANSWERED AT 17/10/2019 - 04:30 AM


QUESTION POSTED AT 17/10/2019 - 04:30 AM

_______ are organelles found in plant cells. they absorb energy from sunlight and use that energy to drive chemical reactions that produce sugars and oxygen.

Chloroplasts are organelles found in plant cells that absorb energy from sunlight and use that energy to drive chemical reactions that produce sugars and oxygen. Because the sugars provide food and energy for the plants and other organisms that consume the plants. The oxygen is used by organisms when they breathe in air.

ANSWERED AT 17/10/2019 - 04:26 AM


QUESTION POSTED AT 17/10/2019 - 04:26 AM

Explain how genetic engineers remove sections from human dna for splicing into bacterial dna

Answer:

The correct answer would be restriction enzymes.

Restriction enzymes refer to the class of enzymes which are involved in cleaving the DNA molecule at or near a particular site which is termed as a restriction site.

Gene of interest and bacterial DNA are treated with the same restriction enzyme (mostly restriction endonuclease) which help in producing sticky ends in the gene of interest as well as bacterial DNA.

The digestion with restriction enzyme helps in removing the gene of interest from other human DNA. In addition, it opens the circular bacterial DNA.

Lastly, the sticky ends help in inserting the gene of interest into the bacterial DNA.

ANSWERED AT 17/10/2019 - 04:26 AM


QUESTION POSTED AT 17/10/2019 - 04:26 AM

Explain how the fetal pig exchanges oxygen and carbon dioxide with its environment.

Fetal pigs provide a good specimen for the study of physiological systems and processes due to the similarities between many pig and human organs. So, analyzing how the fetal pig exchanges oxygen and carbon dioxide will provide us information about the exchange of oxygen and carbon dioxide in the human body.
The respiratory system of the fetal big is responsible for this exchange. The exchange takes place in the alveoli (tiny air sacs of the lungs).
Inhaled oxygen enters the lungs and reaches the alveoli. Then it
 passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.

To support the exchange of oxygen and carbon dioxide, enough amount of air per minute must be brought in and out of the lungs,

ANSWERED AT 17/10/2019 - 04:10 AM


QUESTION POSTED AT 17/10/2019 - 04:10 AM

Carbon dioxide cannot diffuse into the blood from an animal's cells unless the blood has a ___________ concentration of carbon dioxide.

The answer to your question is

Lower

ANSWERED AT 17/10/2019 - 04:08 AM


QUESTION POSTED AT 17/10/2019 - 04:08 AM

Aligned with the scientific method, a scientist has 2 choices when making a conclusion, to either accept or reject the hypothesis. What does it mean to make either of these conclusions? Is it accurate to say that a hypothesis is either “true” or “false”? Explain. Discuss with your classmates. Reply

As a practical field geologist I know that whenever I am working in the field, say mapping the rocks ie showing the distribution and extent of the rocks and their structures, and the type  of rocks, I am constantly forming hypotheses and if it is an active mine such as an open pit, I can prove or disprove my theories because the rocks will be exposed in 3-D revealing their evidence for all to see. For example, at a large open pi

ANSWERED AT 17/10/2019 - 03:00 AM


QUESTION POSTED AT 17/10/2019 - 03:00 AM

Use the example of DDT to explain how a pesticide can bioamplify and damage entire ecosystems

DDT was used to control the malaria-causing mosquitoes. DDT killed them but accumulated in the soil also, through which entered animals and humans via food. There, it gets stored in the fat tissue and is very difficult to breakdown. The predator animals, feeding upon smaller animals, got DDT in their bodies from the smaller animals and DDT thus, magnified to the top level of the food chain. The government realized this and banned DDT.

ANSWERED AT 17/10/2019 - 02:59 AM


QUESTION POSTED AT 17/10/2019 - 02:59 AM

Aligned with the scientific method, a scientist has 2 choices when making a conclusion, to either accept or reject the hypothesis. What does it mean to make either of these conclusions? Is it accurate to say that a hypothesis is either “true” or “false”? Explain. Discuss with your classmates. Reply

An hypothesis is an idea or a result that the scientist is expecting to see. When a hypothesis is rejected, one can decrease the margin of error for further studies that will follow the current one, and when a hypothesis is accepted, the results that were expected were seen. However, when rejecting or accepting an hypothesis, one cannot state that the idea or results obtained are false or true. This purely means that the scientist is either going in the right direction if the results were to be expected, and if not it gives the scientist direction in terms of how to approach further studies. There are no definite true or false results in science, we are simply eliminating the margin of error slowly but surely until we can say something with a bit more clarity and understanding.

ANSWERED AT 17/10/2019 - 02:59 AM


QUESTION POSTED AT 17/10/2019 - 02:59 AM