ou observed isopropanol and water drops on a paper towel. Even though the same amount of energy was transferred into both substances from the air, the isopropanol evaporated while the water did not. Why do you think the isopropanol changed phase, but the liquid water did not?
Answer:
The Isopropanol had a lower heat of vaporization than that of water, meaning that it didn't have to have as much energy to accomplish a phase change, in this case evaporation.
According to the forces of attraction, isopropanol has lower heat of vaporization as compared to water .
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
Learn more about forces of attraction,here:
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You buy a cell phone for $ 200 . The value y decrease by 30% each year. What would be the value of the cell phone in 2 years?
Answer:
The present value after 2 years is $98
Explanation:
Given
[tex]a = 200[/tex]
[tex]r = 30\%[/tex]
[tex]t = 2[/tex]
Required
Determine the new value
This is calculated using:
[tex]y = ab^t[/tex]
Where b =
[tex]b = 1 - r[/tex]
This gives:
[tex]b = 1-30\%[/tex]
[tex]b = 1-0.30[/tex]
[tex]b = 0.70[/tex]
So:
[tex]y = ab^t[/tex]
[tex]y =200 * 0.70 ^2[/tex]
[tex]y =98[/tex]
The present value after 2 years is $98
Answer:
$98
Explanation:
It is the "Correct Answer"
Sue has been complaining about a bad knee for the past few months, particularly when she is going down stairs. She is an active middle-aged mom who regularly participates in tennis, jogging, and hiking. She visited an orthopedic surgeon last week who told her that he would "like to have a look at her knee joint." He also told her that her symptoms indicate damage to the meniscus, and it might have to be removed. What will the doctor do to see the joint, and if the meniscus is removed will Sue be able to maintain her regular active schedule?
Answer:
The doctor do the X ray of her meniscus.
Explanation:
The doctor do the X ray of her meniscus in order to find out the damage in the meniscus, if the damage occurs on the outside of meniscus so it can be heal itself but if the meniscus is deeply damaged so it can only be repair through surgery. If the meniscus is removed, the Sue will not be able to maintain her regular active schedule because there is no shock absorber in your knee which absorb large stress so she can't do her regular activities.
1. List some things that happen to your body when you are really cold or really hot.
2. From your list, think of 3 body systems that work to regulate your body temperature and keep it around 98.6 degrees Fahrenheit .
Answer:
1 . when the body gets really cold . the muscles will generate heat through shivering then the blood vessels that will transfer warm blood from the organs to the cold skin ....
when the body gets hot ... your heart begins to pump faster that way it's bringing the blood closer to the serface of the skin
Explanation:
some body systems that work to regulate body temperature is
. cardiovascular
. muscular
. and the blood vessels as well
hope this helps !!!!
The cereal you ate for breakfast was most like grown in a_____.
desert
grassland
tropical rainforest
Which best describes the transfer of energy through food webs?
A. Energy from animals is recycled among herbivores and carnivores.
B. Energy from plants is transferred from decomposers to consumers.
C. Energy from animals is recycled from decomposers to consumers and then to producers.
D. Energy from plants is transferred to consumers, and then from producers and consumers to decomposers.
Answer:
D.
Explanation:
Energy from plants is transferred to consumers and then producers and consumers to decomposers.
Why don't substitutions cause a change in the amino acid sequence of a protein
Answer:
DNA is constantly changing through the process of Mutation...PLEASE HELP!! During what phase does the spindle fibers break down!!!
Answer:
During Telophase.
Explanation:
A letter about the evidence of evolution
Answer:
I am writing this in response to a letter regarding evolution. Evolution is increasingly solid, not shaky. Darwin’s “theory” or explanation was a way of understanding what he had discovered (which did not include genes, chromosomes, DNA or nucleotide bases). Our explanations now include genetics and the commonality of mutation.
Proofs are solid, not in question by serious scientists. Direct observation is one, which we see in the fact that this year’s flu evolved a little too far from last year’s, so flu shots are less effective this year than we would like them to be.
Fossils tell the story well: whales with legs, dinosaurs with feathers and Tiktaalik. The latter was found in the Canadian north and is part fish, part amphibian, before there were ever any amphibians. Imperfection is a good proof: think of your useless appendix, the very bad design of your ankles, knees, and back (talk to a chiropractor about that). You have big toes because they used to be useful thumbs for your grasping feet.
Many other animals and even plants similarly have flaws that show their evolutionary past. Two large human chromosomes reflect the coming together of two chimpanzee chromosomes each.
Hope it helps,
Please mark me as the brainliest
Thank you
Chloroplasts have two regions.
and stroma.
Answer:
grana and stroma
Explanation:
The ecological role of fungi is that of:
O producers
O predators
O grazers
O decomposers
Answer:
decomposers si the light answer
The halfway point of development is about 20 weeks. Is the average baby half of its full birth length at 20 weeks?
Help please!! I don’t understand this.
Answer:
1. California Sea Lion and Galapagos Sea Lion are closely related because they have the same genus Zalophus.
2. Escherichia is a Genus.
3. Fungi
Which of the following describes a mutual relationship?
A pack of hyenas hunt together so they can attack larger animals.
Ants drink nectar from an acacia tree and protect the tree from harmful insects.
A flock of seagulls fly together to reduce the amount of air resistance they feel.
A grasshopper and a rabbit eat different types of plants to avoid competition.
Answer:
Your answer would be A: A pack of hyenas hunt together so they can attack larger animals.
Using homologous structures and any other information (from notes, activities, etc),
explain your opinion on the THEORY OF EVOLUTION in 8 sentences. Be sure to cite
evidence (supporting details) for your ideas (EVALUATION RI 8.8).
evolution is fundamentally unpredictable.the theory of evolution as it is used here refers to "macroevolution'a theory is meant to both explain and predict;the theory of evolution only explains .the theory of evolution is not a theory and it is suggested calling it a working hypothesis:the working hypothesis of evolution
The genetic information Contained In the cell resulting from meiosis?
Answer:
The answer to the question is DNA
Answer:
C) determines the traits of offspring resulting from sexual reproduction
Explanation:
The genetic information contained in the cells resulting from meiosis determines the traits of offspring resulting from sexual reproduction
Hopes it helps!! ;)
__________ is a single-stranded molecule made of nucleotides of bases uracil, adenine, guanine, and cytosine
Which of these is an example of soil contamination?
a. A recycling bin
b. An eroded hillside
c. Industrial waste
d. A clear-cut forest
Answer:
industrial waste
Explanation:
Plants growing high up on mountains tend to be much smaller than those growing at sea level. This is because the rate of photosynthesis for plants on the mountain is slower. Which factor is at a lower level in the mountain environment, causing a limit to the rate of photosynthesis?
Answer:
CO2
Explanation:
biology need help asap
Answer:
picture 1: frameshift mutation picture 2: karyotype c
Explanation:
explain how the result of meiosis and cytokinesis affects inherited traits
ANY FOUR DICOT SEED?
Answer:
bitter gourd seeds
castor seeds
Mango seeds
Night jasmime seeds
What are the products of photosynthesis? (5 Points glucose and oxygen glucose and carbon dioxide carbon dioxide and ATP
Answer:
Glucose and Oxygen
Explanation:
plssssssssssssssssssssssssssssssssssssssssss help
Answer:
1st question= physical weathering
2nd question= deposition
Explanation:
hope it helps
1. Which statement regarding these
methods of reproduction is correct?
(1) They are both forms of asexual
reproduction.
(2) They are both forms of sexual
reproduction.
(3) Method A is a form of asexual
reproduction and method B is a form of
sexual reproduction.
(4) Method A is a form of sexual
reproduction and method B is a form of
asexual reproduction.
Do you have a like text book for this for me to answer?
Which of the following is the best description of an element?
1. A substance that cannot be broken down into simpler substances
2. A naturally occurring mineral made of more than one substances
3. A small particle made with a specific chemical composition
4. A collection of atoms that have different abilities when joined together
Answer:
I think 1
Explanation:
you can't break an element into different elements
Which if the following are more closely related? Why?
A- Frog and Ant
B- Salmon and Frog **
C- Bear and Ostrich.
A climber falls down on a rope causing his body to lift up words and rise up along the rope is that newtons first law second law or third law
What is the main function of the immune (lymphatic) system?
A. Keeping a body healthy from disease
B. absorbing oxygen
Answer:
A. Keeping a body healthy from diseaseAnswer:
A. Keeping a body healthy from disease
Explanation:
The immune system is made up of special organs, cells and chemicals that fight infection (microbes).
Hope this helps!
Which neurotransmitters are used for each division of the autonomic nervous system? Be sure to describe the synapse at the autonomic ganglion and at the effector. What component of the system determines if a given neurotransmitter has an excitatory or inhibitory effect on the target effector?
Answer:
The autonomic nervous system is in charge of controlling visceral effectors. Traditionally, it is described by its peripheral nervous components (ganglia, nerves and plexuses) and two divisions are distinguished: the sympathetic and the parasympathetic. Transmission of the excitatory stimulus through the synaptic cleft occurs by release of neurotransmitters; the neurotransmitters of the sympathetic and parasympathetic nervous system are mainly norepinephrine (NA) and acetylcholine (AC). The NA-secreting fibers are called adrenergic and those that secrete AC, cholinergic. All preganglionic neurons, both those of the sympathetic nervous system and those of the parasympathetic nervous system, are cholinergic. The neuron that releases the neurotransmitter is called a presynaptic neuron. The signal receptor neuron is called a postsynaptic neuron. Depending on the type of neurotransmitter released, postsynaptic neurons are either stimulated (excited) or de-stimulated (inhibited).
Explanation:
The autonomic nervous system is the part of the central and peripheral nervous system that is responsible for the regulation of the involuntary functions of the organism, the maintenance of internal homeostasis and the adaptive responses to variations in the external and internal environment and two divisions are distinguished: the sympathetic and the parasympathetic. Acetylcholine is the preganglionic neurotransmitter of both divisions of the S.N.A. (sympathetic and parasympathetic) and also of the postganglionic neurons of the parasympathetic. The nerves at whose endings acetylcholine are released are called cholinergic. Norepinephrine is the neurotransmitter of postganglionic sympathetic neurons. The nerves into which norepinephrine is released are called adrenergic. Within the efferent sympathetic impulses, the postganglionic neurons that innervate the eccrine sweat glands and some blood vessels that supply the skeletal muscles are of the cholinergic type. Both acetylcholine and norepinephrine act on the different organs to produce the corresponding parasympathetic or sympathetic effects. The peripheral nerve endings of the sympathetic form a reticulum or plexus from which the terminal fibers come in contact with the effector cells. All the norepinephrine in peripheral tissues is found in the sympathetic endings in which it accumulates in subcellular particles analogous to the chromaffin granulations of the adrenal medulla. The release of norepinephrine at nerve endings occurs in response to action potentials that travel through nerve endings. The receptor, when stimulated by catecholamines, sets in motion a series of membrane changes that are followed by a cascade of intracellular phenomena that culminate in a measurable response. There are two classes of adrenergic receptors known as alpha and beta. These two classes are again subdivided into others that have different functions and that can be stimulated or blocked separately. Norepinephrine primarily excites alpha receptors and beta receptors to a small extent. The neurotransmitter acetylcholine is synthesized at the axonal terminal and deposited in synaptic vesicles. Acetylcholine activates two different types of receptors, called muscarinic and nicotinic receptors. Acetylcholine (AC) synthesis takes place at presynaptic termination by acetylation of choline with acetyl-coenzyme A, a reaction catalyzed by acetylcholinetransferase. The energy required for the release of a neurotransmitter is generated in the mitochondria of the presynaptic terminal. Binding of neurotransmitters to postsynaptic membrane receptors produces changes in membrane permeability. The nature of the neurotransmitter and the receptor molecule determines whether the effect produced will be one of excitation or inhibition of the postsynaptic neuron.