Answer:
1. The oxidation number of Ca is 2, F is -1 in CaF₂
2. The oxidation number of H is 2, S is 6, O is -8 in H₂SO₄
3. The oxidation number of Ca is 2, S is 6, O is -8 in CaSO₄
4. The oxidation number of H is 1, F is -1 in HF
Explanation:
To get the oxidation number, we need to take the oxidation number of the whole compound 0. Then we need to know the oxidation number of the other elements and we need to take 'x' as the oxidation number of the unknown element.
Example:
In case of CaSO₄,
We can write an equation as-
CaSO₄ = 0
If we need to know the oxidation number of S
We can write the equation like this-
→2+ x+ (-2*4) = 0 (as we know the oxidation number of Ca is 2 as it has two electrons in its last shell which it gives to other elements to form bonds and the oxidation number of O is -2 as it takes 2 electrons to complete its outer shell)
→2+ x+ (-8) = 0
→2+ x- 8 = 0
→x- 6 = 0
→x = 6; which is the oxidation number of S
The following are the oxidation numbers:
In CaF2, the oxidation number of Ca is +2, and that of F is -1.
In H2SO4, the oxidation number of H is +1, that of S is +6, and that of O is -2.
In CaSO4, the oxidation number of Ca is +2, that of S is +6, and that of O is -2.
In HF, the oxidation number of H is +1, and that of F is -1.
What is oxidation number?Oxidation numbers are a way of representing the degree of oxidation (loss of electrons) or reduction (gain of electrons) of an element in a chemical compound. The oxidation number of an element is calculated based on the number of valence electrons (electrons in the outermost energy level of an atom) and the rules for assigning oxidation numbers.
In general, the oxidation number of an element is equal to the charge it would have if all the bonds in the compound were ionic (made up of positive and negative ions). This allows chemists to predict the behavior of elements in a compound and to balance chemical equations.
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Select the correct answer. What’s the significance to scientists of finding a new, unknown fossil?
A. It allows scientists to formulate new theories.
B. It enables scientists to better differentiate among the various species.
C. It proves that there’s an unlimited supply of fossils to be unearthed.
D. It provides evidence of links between evolutionary species.
E. It provides scientists with a reason to continue their research.
Answer: D. It provides evidence of links between evolutionary species.
Explanation: The significance to scientists of finding a new, unknown fossil is that it provides evidence of links between evolutionary species.
Organisms arose as a result of these changes, and some of their remains have been preserved as fossils. An organism's type, life history, and preservation method can all be ascertained by studying a fossil. Thus, option D is correct.
What are the features of finding a new, unknown fossil?They can discover when and how various animals existed millions of years ago by studying fossils. Fossils can sometimes show scientists how the Earth has changed over time.
The discovery of a new, undiscovered fossil is significant to scientists because it shows connections between evolutionary species.
Fossils with remarkably similar geometries are thought to be from the same species. It is considered that fossils with somewhat differing geometries come from a separate species. Usually, the fossil species has been researched and given a name.
Therefore, It provides evidence of links between evolutionary species.
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You experimentally apply a toxin to a muscle and find that it does not contract when you electrically stimulate the motor neuron leading to it. You know that this toxin blocks acetylcholine receptors. Therefore, you suspect that the stimulation of contraction is failing because: Group of answer choices
The question provided is not complete as it lacks the group of choices, however the group of choices are given as follows:
A. A contraction fails to occur because an action potential is not generated in the muscle cell.
B. A contraction fails to occur because this toxin directly prevents ion release from intracellular stores.
C. A contraction fails to occur because neurotransmitter release by the motor neuron is blocked at the neuromuscular junction.
D. A contraction fails to occur because this toxin prevents cross bridge formation and thereby directly prevents contraction.
E. C and D are both true
Answer:
The correct answer is option A : A contraction fails to occur because an action potential is not generated in the muscle cell.
Explanation:
A muscle contraction takes place when action potential bring to muscles by nerves, which is traveled with the help of motor neuron and imitated the muscle contraction.
Acetylcholine or Ach is a chemical messenger to bring the nerve impulses between a nerve and a muscle. If the receptor is block with applying toxin muscle will not contract as ACh will not be able to propagate the nerve impulse to the muscle so there will be no action potential.
The correct answer is option A : A contraction fails to occur because an action potential is not generated in the muscle cell.
Please help! Will give Brainliest!
Answer:
A. Do bees fly faster before or after feeding?
Explanation:
Because of the observations made, you can assume the answer has something to do with the bees weight, or wing support. Because the bee probably has a harder time flying when it has more weight on it, the answer is probably A.
If you are preparing a report about the effect of climate change on sea level,
whose work would you be most likely to study?
A. Warren Washington
B. Edwin Hubble
O C. Christian Doppler
O D. Charles Kuen Kao
Answer:
A. Warren Washington
I hope this helps you :)
Consider the cladogram. A cladogram is shown. Roundworms have the derived characteristics of true tissues, bilateral symmetry, and a pseudocoelom. Which group of organisms has the derived characteristics of true tissues, bilateral symmetry, and a pseudocoelom? sponges roundworms annelids chordates
Answer:
The correct answer is - roundworms.
Explanation:
The answer is already mention in the question, however, the detailed answer is as follows:
The characteristics that are given in the question are true tissues, bilateral symmetry, and a pseudocoelom. Worms or helminths are known as primitive form of organization of the Bilaterians. All three group of worms or helmints have a basic bilateral symmetry.
These organisms inaugurated various characteristic that are found and carried by other animals such as true tissues, bilateral symmetry, and a pseudocoelom.
Thus, the correct answer is - roundworms.
Answer:
its b
Explanation:
• Which category of energy interested you the most? Choose from one of the following: fossil fuels, nuclear energy, biomass, hydropower, solar energy, geothermal energy, or wind energy.
Answer:
nuclear energy
Explanation:
coz nuclear energy are awesome
Im interested in solar energy.
The career area that is interesting is pure research into new science.
How does a scientist use solar energy in pure research to develop new ways in science?
What is pure research?
How can a scientist get solar energy?
What does a scientist do in pure research?
When do scientist know they found a new way?
How can they propose the new way of science?
Interviews
Wikipedia
News
Web
Magazines
Farming, grazing of livestock, mining, and drilling combined account for: Over 1/2 of deforestation About 1/3 of deforestation 3/4 of deforestation All of deforestation
Answer:
Over 1/2 of deforestation
Explanation:
Farming, grazing of livestock, mining, and drilling combined account for Over 1/2 of deforestation or more than half of deforestation.
These are few of the major causes of deforestation which is continuously destroying forests and wildlife that leads to global warming.
Forests are destroyed for farming purposes, overgrazing by cattles, urbanization of forests in industries and towns, mining, and drilling should be controlled to save deterioration of the earth.
Hence, the correct answer is "Over 1/2 of deforestation ".
The following is a list of the steps that occur in the production of an auditory sensation. 1. The pressure wave distorts the basilar membrane on its way to the round window. 2. Movement of the tympanic membrane causes displacement of the malleus. 3. Displacement of the stereocilia stimulates sensory neurons of the cochlear nerve. 4. Movement of the malleus causes movement of the incus and stapes. 5. Distortion of the basilar membrane forces the hair cells of the organ of Corti toward or away from the tectorial membrane. 6. Movement of the oval window establishes pressure waves in the perilymph of the vestibular duct. The proper sequence for these steps is:___________.A. 2,4,1,6,5,3B. 2,4,6,3,5,1 C. 2,1,4,6,5,3D. 2,4,6,1,5,3E. 2,5,4,6,1,3
Answer:
The correct answer is option D, that is, 2,4,6,1,5,3.
Explanation:
With the approaching of sound waves, ear pinna mediates it towards the external auditory canal, this makes sound waves to reach the tympanic membrane. This results in the vibration of the tympanic membrane, and as the malleus, that is, the first ear ossicle, which is attached to the tympanic membrane gets displaced.
This movement of the malleus further moves the stapes and the incus. As the footplate of the stapes is associated with the oval window, the movement of the oval window takes place. This movement of the oval window creates pressure waves in the vestibular duct's perilymph. The movement of these pressure waves takes place from the Oval window to the Round window.
At the time of this movement, the pressure wave distorts the basilar membrane on its path to the round window, resulting in the vibration of the basilar membrane and the hair cells situated in the membrane against the tectorial membrane.
The stimulation of the sensory neurons takes place in the vestibulocochlear nerve's cochlear branch due to the displacement of the stereocilia. Post this, information reaches the auditory cortex in the temporal lobe's superior temporal gyrus, and hearing takes place.
Option D is the one that shows the correct sequence of steps in an auditory sensation. In this case, the sequence is 2,4,6,1,5 and 3.
We can arrive at this answer because:
At the beginning of auditory sensation, the pinna turns to the external acoustic meatus, directing the sound waves to the tympanic membrane.These waves provoke an intense vibration in the tipanic membrane, which provokes the displacement of the malleus.The displacement of the malleus causes a movement that also displaces the stapes, the incus, and the oval window.The movement of the oval window causes other waves that press against the round window.This causes the basilar membrane and hair cells to vibrate, causing stimulation of sensory neurons.At that point, auditory information reaches the auditory cortex in the temporal lobe, allowing hearing to take place.
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can DNA be extracted from dead cells
Can I please have some help with this -> "2.59 describe the composition of the blood: red blood cells, white blood cells, platelets and plasma 2.60 understand the role of plasma in the transport of carbon dioxide, digested food, urea, hormones and heat energy"
Answer:
red blood cell helps on transportation of oxygen
white blood cell provide antibiodies which fight against diseases
platelets helps in blood clotting
Blood is a viscous connective tissue made up of a number of distinct elements. These consist of:
Red Blood cellsWhite blood cellsPlateletsPlasmaWhat is Blood?Blood is a viscous connective tissue made up of a number of distinct elements. These consist of:
1. Red blood cells, also known as erythrocytes, are the blood's most numerous cells and are in charge of carrying oxygen from the lungs into the body's tissues.
2. White blood cells, also known as leukocytes, are a component of the immune system of the body and are in charge of protecting the body against illnesses and foreign invaders.
3. Small cell fragments known as platelets, sometimes known as thrombocytes, are in charge of causing blood to clot and controlling excessive bleeding.
4. About 55% of the total volume of blood is made up of plasma, the liquid component of blood. It is a transparent, straw-colored fluid with a number of dissolved materials in it, such as water, electrolytes, proteins, hormones, and waste.
Plasma plays a crucial role in the transport of various substances throughout the body. Some of the substances that are transported by plasma include:
Carbon dioxideDigested foodUreaHormonesHeat energyTherefore, Blood is a viscous connective tissue made up of a number of distinct elements. These consist of:
Red Blood cellsWhite blood cellsPlateletsPlasmaLearn more about Blood, here:
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Which function is specific to the neuron? It generates electrochemical signals so that the body can react to stimuli. It produces antibodies to destroy pathogens for protection purposes. It breaks down chemical substances into a form that is usable by the body. It delivers oxygen to the cells of the body for metabolic processes.
Answer:
It generates electrochemical signals so that the body can react to stimuli.
Explanation:
This is the job of the nervous system; it allows our body to react to stimuli. Neurons are what allows us to feel if something is touching our body (or if we are touching something) by sending synapses all the way to the brain at an incredibly fast pace.
Answer:
It generates electrochemical signals so that the body can react to stimuli.
Explanation:
edge 2022
Which of the following is not a negative consequence of upward urban growth?
a pollution
b creation of a "heat island"
C. increased use of surrounding land
d. waste management issues
Please select the best answer from the choices provided
A
OOOO
Answer: I believe its C
Explanation:
Answer:
C. increased use of surrounding land
Explanation:
Edge2021
In humans, the ability to roll up the sides of the tongue into a U-shape is controlled by one gene. Ability to roll the tongue is dominant to the inability to roll it. If two people who can roll their tongues each had one parent who could not, what is the probability that they will have a child who cannot roll his/her tongue
Answer:
25%
Explanation:
male
can roll tongue - cannot roll tongue
female
can roll tongue - cannot roll tongue
If they have a child, the possible combinations are:
1)
father's gene: can roll tongue
mother's gene: can roll tongue
RESULT = THE CHILD WILL BE ABLE TO ROLL HIS/HER TONGUE
2)
father's gene: can roll tongue
mother's gene: cannot roll tongue
RESULT = THE CHILD WILL BE ABLE TO ROLL HIS/HER TONGUE
3)
father's gene: cannot roll tongue
mother's gene: can roll tongue
RESULT = THE CHILD WILL BE ABLE TO ROLL HIS/HER TONGUE
4)
father's gene: cannot roll tongue
mother's gene: cannot roll tongue
RESULT = THE CHILD WILL NOT BE ABLE TO ROLL HIS/HER TONGUE
Many male birds will expend A great deal of energy building nests. Females will mate with the males who build the best nest. This is best described as an example of ___.
a) natural selection
b) sexual selection
c) runaway selection
d) an invasive species
e) disruptive selection
Answer:
B
Explanation:
Female birds mate with the males who build the best nest is the example of option b. sexual selection.
Sexual selection is a mode of natural selection in which one sex members choose the mate with the member of the other sex for mating.
These members of the biological sex prefer opposite sex members for species-specific characteristics in individuals of the other sex such as best building nest in birds. Other male birds compete with members of the same sex to get selected by members of the female birds in this instance.Thus, the correct answer is option b. sexual selection as female birds prefers species-specific traits to select their mating partner by best nest building by males.
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Which of the following organisms convert energy from the sun into chemical energy?
Answer:
This would include any plant/moss/tree/any autotroph.
Explanation:
Autotrophs are capable of making their own food, unlike heterotrophs who consume other organisms and autotrophs to receive nutrients.
Explain why fermentation stops after
a certain time in making
making bread?
Answer:
The yeast die at 140° F
Explanation:
The fermentation process is caused by the living organisms called yeast feeding on the sugar in the dough. As the yeast feed on the sugar they release CO² which causes the bread to rise but once the bread in the oven reaches 140° all the yeast are killed off and the fermentation process stops.
The process of fermentation stops after a certain time in making bread because the organism which carries this process has been killed.
What do you mean by Fermentation?Fermentation may be defined as a process a chemical process by which molecules such as glucose are broken down anaerobically in the presence of yeast.
During fermentation, the yeast produces excess carbon dioxide due to which the dough of bread swells. But after the completion of fermentation when bread places in the oven or any other warmer temperature, it killed the yeast, and hence fermentation stops.
Therefore, the process of fermentation stops after a certain time in making bread because the organism which carries this process has been killed.
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Which best describes a scientific theory?
A. An idea that is supported by many different experiments
B. A hypothesis that is proven true with an experiment
C. The conclusion of a single scientist about a hypothesis
D. An educated guess about an aspect of nature
Answer:
Hey there!
A theory can be best described as an idea that is supported by many different experiments.
Let me know if this helps :)
Which of the following would ATP NOT be used for as energy? A. Healing a cut B. Osmosis C. Push ups D. Keeping warm
Answer:
B. Osmosis
Explanation:
Answer: B: Osmosis
Explanation: Since osmosis is a simple diffusion it does not require ATP.
What are the two components of the scientific name of a species in the Linnaean system? Select all that apply. Genus, Specific epithet, Phylum, Family.
Answer:
Genus, Specific epithet
Explanation:
The scientific name was created to establish a standardized language that would allow scientists and scholars around the world to be able to present living beings independently of their native language.
For this purpose, it was decided that the scientific name would be a binomial composition, that is, it would use two names. The first name refers to the genus to which the species belongs, the second name refers to the specific epithet that is the specific descriptor of that species. In addition, the scientific name should be written in italics and have the first initial letter written in uppercase. Ex: Homo sapiens.
Select the correct answer from each drop down menu.
During an experiment, readings for blood pressure in a person's body were found to be constant. However, when measured by a
different blood pressure cult, the readings differed by 15 points for each reading. This difference indicates that the results are
but not
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dimentum. All rights reserved
Answer:
The results are precise but not accurate
Explanation:
Precision is the term that refers to the degree of agreement between measured results. This means that the measurements of the finished system are very similar and with equal differences, under the same conditions.
An example of this is the results shown in the question above, which are very similar. In addition, these results do not have the "real and absolute value" and therefore are not accurate.
Which of the following is a distinct structure found specifically in the liver, spleen, and bone marrow?
Select one:
a. Sinusoidal capillaries
b. Fenestrated capillaries
c. Venous sinus
d. AV anastomoses
e. Continuous capillaries
Answer:
option A is correct
Explanation:
Which of the following sequences is correct for the downhill movement of electrons during cellular respiration? A. glucose – citric acid – ATP – NAD+ B. glucose – NADH – electron transport – O2 C. glucose – pyruvate – ATP - oxygen D. glucose – ATP – electron transport - NADH E. glucose – Kreb’s cycle – NADH - ATP
Answer:
B. glucose – NADH – electron transport – O2
Explanation:
This is the sequence from glycolysis in which glucose molecules are split down to pyruvate, to oxidative phosphorylation.
During this process the electrons are released from glucose molecule as it is oxidised multiple times as pyruvate, and other molecules formed subsequently in Kreb's cycle, until the oxidative phosphorylation is reached .
The makes the carrier molecules to be reduced.Thus NAD→NADH,FAD→FADH .
The electrons from above are transferred in hydrogen atoms to matrix by these co-enzymes.Where the H is split to electrons and protons.
The electrons for the ETC, produce the PMF for transporting protons into the intramembrane space.
The concentration of protons generated the electrochemical gradients which is needed to produce energy for for phosphorylation of ADP with Pi to form ATP by ATpase synthase.
The electrons moves as chain,and this is finally accepted by oxygen as the final electron acceptor.
Determine whether each of the following is a characteristic of DNA, RNA, or both.
Is single-stranded:
Contains nitrogenous bases:
Contains uracil:
Contains adenine:
Is double-stranded:
Is made of nucleotides:
Contains deoxyribose sugar:
DONE
Answer:
Both DNA and RNA are made from nucleotides, each containing a five-carbon sugar backbone, a phosphate group, and a nitrogen base. DNA provides the code for the cell's activities, while RNA converts that code into proteins to carry out cellular functions.
Which of the following descries a solution that contain a buffer? A. Sodium hydroxide, a base, is added to the solution, and the pH of the solution becomes higher. B. Citric acid is added to the solution, but the pH of the solution does not change. C. Acetic acid is added to the solution, and the pH of the solution becomes lower. D. Distilled water is added to the solution, and the pH of the solution does not change.
Answer:
B. Citric acid is added to the solution, but the pH of the solution does not change.
Explanation:
In chemistry, buffer solutions or simply called Buffer are solutions that resist a change in pH when an acid or base is added to them i.e they maintain a constant pH. This is as a result of the content of the solution. A buffer may contain a weak acid and its conjugate base (salt) or a weak base and its conjugate acid.
Hence, when a strong base or acid is added to them, they still restore the original pH of the solution due to the reaction that removes or neutralizes the hydrogen or hydroxide ions from the acid and base added to them respectively. This is what happens when Citric acid is added to the solution, but the pH of the solution does not change.
Citric acid, which is an acid, does not practically increase or decrease the pH of the solution. Hence, the solution is called a buffer.
Answer:
Citric acid is added to the solution, but the pH of the solution does not change.
Explanation:
Got it right on Apex
Hope I helped! :)
Scientists are able to reproduce certain plants and animals by cloning them in laboratories. The diagram shows the steps of cloning using tissue cultures. Do you think cloning is a form of asexual reproduction? Explain your answer using evidence from the diagram
Answer:
Yes.
Explanation:
Yes, cloning is a form of asexual reproduction because there is no fusion of sperm and eggs takes place. the animal which is formed from this process is identical of that organism because it is produced from the tissue of that single animal. in 1996, first mammal is produced from cloning was sheep named dolly at the Roslin Institute in Scotland. In cloning, the egg is taken from female organism and remove the nucleus from the egg then the desired organism cell is taken and fuse with the nucleus with the help of electricity. Then implant this embryo in the body of first organism from where egg is taken and after that the embryo turns into a baby, this process is called cloning.
Answer:
Yes, cloning is a form of asexual reproduction. The diagram shows that new plants form from a single parent plant, which means that the offspring are genetically identical to the parent.
Explanation:
Edmentum
Match each hormone to its function
•luteinizing hormone
•testosterone
•oxytocin
•follicle-stimulating hormone
•estrogen
•gonadotropin-releasing hormone
Answer: Stimulates the contraction of the uterus during childbirth - OXYTOCIN
Stimulates sperm production and growth of ovarian follicles - FOLLICLE STIMULATING HORMONE
Initiates the Secretion of leutinizing hormone and follicle stimulating hormone - GONADOTROPIN RELEASING HORMONE
Initiates the development of secondary sex characteristics in females - ESTROGEN
Initiates the development of secondary sex characteristics in males - TESTOSTERONE
Initiates cell production of testosterone and estradiol by cells in the gonads - LUTEINIZING HORMONE.
The correct match for hormone and their functions are- 1- Oxytocin, 2- follicle-stimulating hormone, 3- a gonadotropin-releasing hormone, 4- estrogen, 5- testosterone, and 6- luteinizing hormone.
Oxytocin is a naturally occurring hormone that plays a vital role in the reproductive system of both men and women, including labor, delivery, and breastfeeding, as well as in human behavior.
FSH is produced by the pituitary, which is a small gland just below the brain. The pituitary plays a vital role in the development and regulation of sexual function.
Gonadotropin-releasing hormone stimulates the brain’s pituitary gland to produce and release the hormones LH and FSH.
Estrogen is a family of hormones that play a vital role in the reproductive and sexual development of women.
Testosterone is a male sex hormone. It is responsible for spermatogenesis and fertility in males.
Luteinizing hormones (LH) are hormones in the body that stimulate the reproductive system. Luteinizing hormone stimulates ovulation and stimulates the production of the hormones needed for pregnancy
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Human Bones
Name three components of bones and describe
their function.
Answer: 1st the periostneum which is the outside of the bone and a thin but dense layer that has nerves and blood vessels
2nd compact bone. It is very smooth and very hard
3rd and lastly Cancellous, this looks a little like a sponge but much harder.
Explanation:
Answer:
The periosteum is a thin, dense membrane that contains nerves and blood vessels that nourish the bone.
Compact bone is smooth and dense. It is the hard part of the bone.
Cancellous bone looks like a sponge and protects the bone marrow.
Bone marrow is a thick jelly that makes blood cells.
Explanation:
These are the check offs for edge 2021
Which of the following questions is the most testable through scientific experimentation? Will mark brainliest, plz help A. which gelatin takes longer to set: gelatin with fruit or gelatin without fruit B. Which fruit looks more attractive in gelatin: bananas or apples C. Which tastes better: gelatin with fruit or gelatin without fruit D. Which fruit do more people buy in one year: bananas or apples
Answer:
Which gelatin takes longer to set: gelatin with fruit or gelatin without fruit.
Explanation:
Atmospheric nitrogen can be fixed by nitrogen-fixing bacteria. Arrange the following forms of nitrogen from the atmospheric N stage to the final form that enters the roots. 1. Ammonia 2. Nitrogen gas 3. Ammonium ion 4. Nitrite 5. Nitrate
Answer:the answer is ammonia
Explanation:the nitrogen fixing bacteria fix the nitrogen as ammonia
which of the following is NOT a type of volcano?
Answer:
Eliminate from the following
Explanation:There following are the only types of volcanos
Cinder cones,composite volcanoes,shield volcanoes and lava domes
