Cells communicate via chemical signals which bind to specialized molecules on the plasma membrane surface. These molecules are called receptor proteins.
Receptor proteins are the transmembrane proteins. These are embedded in the cell membrane. They are responsive to specific ligand molecules which are extracellular. Chemical signals between cells are called as ligands. During cell signalling, when a ligand binds to its receptor, receptor transmits the signal to the cell and conforms the change. Receptor proteins enable the cells to recognize the hormones, nutrients, etc. Cell communication is necessary to perform cell functions. Cell signaling is a part of a complex cell communication process which involves three stages: Reception, Transduction and Response. Cells communicate using chemical signals which are receptor proteins produced by or secreted from the cell and released from the extracellular space.To learn more about cell signaling,
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A soccer ball is traveling downfield with a force of 1.2 kN and strikes another soccer ball that is
stationary. Which of the following describes the result of the collision? (1 point)
The stationary soccer ball will begin moving upfield and the ball that struck it will slow down.
Neither ball will move after impact.
The stationary soccer ball will begin moving downfield and the ball that struck it will slow down.
O The stationary soccer ball will begin moving downfield and the ball that struck it will accelerate.
C. The stationary soccer ball will begin moving downfield and the ball that struck it will slow down
What is collision?Collision occurs when two objects travelling in opposite direction hit or strike each other.
Collision of two objects can be perfectly elastic or inelastic.
When the ball strikes the stationary ball, it will slow down while the stationary ball will move downfield. This is because some of the momentum of the soccer ball will be transferred to the stationary ball.
Thus, the stationary soccer ball will begin moving downfield and the ball that struck it will slow down.
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Responses and Reasoning
===============================Hello! Lets begin!
1. Which statement best describes force?
The statement that best describes what force is "Force is a vector quantity that measures both direction and magnitude of a push or pull on an object.""Why?"
Force refers to the push or pull exerted on an object that influences the motion and direction of the object. Force is a vector quantity, meaning that it combines both magnitude and direction. The direction of the force applied to an object affects the motion of the object and, due to force being a vector quantity, the value of forces can be assigned a negative or positive value.
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2. A soccer ball is traveling downfield with a force of 1.2 kN and strikes another soccer ball that is stationary. Which of the following describes the result of the collision?
The choice that describes the result of the collision would be "the stationary soccer ball will begin moving downfield and the ball that struck it will slow down.""Why?"
When an object is at rest, the object is in a state of balanced forces. The object at this time is stationary, and will remain that way until another force/object forces it into inertia, sending the object into motion. Now, in this scenario, the ball in motion collides with the ball at rest, sending the resting ball forward. When a collision of force occurs, the original object in motion begins to slow down after the transfer of force and eventually falls into a resting state.
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3. Which of the following scenarios accurately describes magnitude and direction?
The scenario that accurately describes magnitude and direction would be "A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5 kN.""Why?"
Force is a vector quantity that measures both direction and magnitude of a push or pull on an object . It can also be explain as, force is an external agent capable of changing a body’s state of rest or motion. It has a magnitude and a direction.
The direction towards which the force is applied is known as the direction of the force, It is represented by F and unit is Newton & S.I. unit is kg ·m/s².
F = ma
Where, m is the mass of body and a is the acceleration of the body .
Acceleration of a body or an object is given as, the rate of change of the velocity of an object with respect to time. The unit of acceleration is m/s².
a = Δv/Δt
Where , Δv is the change in acceleration and Δt change in time .
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4. What is the force directly proportional to?
Force is directly proportional to the acceleration and mass of an object."Why?"
As we increase the force on an object the acceleration increases proportionally. Since the mass does not change as the acceleration increases, we can say that force is equal to acceleration. Therefore, if you double the force you double the acceleration.
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5. Two ropes are being used to suspend a box. Each rope is exerting 5 N of upward force. If the forces are balanced and the box is stationary, how much force is being exerted by the box itself and in which direction?
The box is exerting 10 N of force downward."Why?"
Balanced forces of objects at rest often are in balance of both gravitational force and normal force. The forces are pushing the object both down and up keep the object at a state of rest until a force/object force the object into a state of inertia (into motion). This being said, if each individual rope is exerting 5 N of upward force, (note the question quotes the forces are balanced) and the box is stationary, the force of the box must be 10 N of force downward in order for the forces to remain balanced.
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Hope this helps! If you have any more questions, I'd be happy to help. Thanks and good luck!
A bottle filled to the 25 mL mark contains 75 g of bromine. What is the density of the bromine?
An organism that gets electrons from h2 and makes its own organic carbon from carbon dioxide is classified as a?
Answer:
Chemoheterotrophs
Explanation:
they use organic chemical substances AKA perform chemosynthesis. Many microscopic organisms do this.
A particle went around a circular track of radius 12.0 m. It traveled one and a half revolution in under 29.4 s. What is the distance travelled and the magnitude of displacement of the particle?(in meters)
Answer:
Displacement is the shortest distance travelled from the initial point to the final point. After half revolution the displacement is the length of the diameter which is equal to 2r. Hence the displacement is 2r.
About 10% of the water enters the atmosphere through
how did telescope chage how scientists see and intereact with the universe
Answer:
Telescopes have opened our eyes to the universe. Early telescopes showed that Earth was not the center of the universe, as was previously believed. They also showed mountains and craters on the moon. Later telescopes have revealed geography and weather on the planets in our solar system.
Explanation:
When sodium (Na) is mixed with water, an explosion takes place. Based on its location on the periodic table, how will potassium (K) behave with water?
a) Potassium is in the same period as sodium and shares similar properties so it will explode.
b) Potassium has the same number of valence electrons as sodium so it will explode in water.
c) Potassium is a non metal but sodium is a metal so potassium will not explode.
d)Potassium is in the same group as sodium so it does not share similar chemical
properties and it will not explode.
Based on the location on the periodic table, potassium has the same number of valence electrons as sodium so it will explode in water (option B).
What is the periodic table?The periodic table is a tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same group (column).
On the periodic table, elements in the same group exhibits the same chemical properties because they possess the same number of valence electrons.
According to this question, when sodium (Na) is mixed with water, an explosion takes place. Since pottasium and sodium are in the same group, it will also explode when in a reaction with water.
Therefore, based on the location on the periodic table, potassium has the same number of valence electrons as sodium so it will explode in water.
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As you were taking lettuce in the grocery store, you were surprised when water sprinklers suddenly went on, spraying fresh water on the produce. When you got back home, you immersed the lettuce in a salt solution, and within several minutes they became limp and soft. What are the explanations for the spraying procedure in the store, and your observation at home?.
The explanations for the spraying procedure in the store, and your observation at home will be that Lettuce cells are hypertonic to fresh water making them turgid and fresh-looking, but hypotonic to the salt solution, hence plasmolyzed.
Polyunsaturated fatty acids (PUFAs), which made up 71.53–73.50% of the total fatty acid content, were the main constituents of lettuce. With the exception of myristic and arachidic acids, the biofortified samples' fatty acid composition did not change statistically significantly from that of the control lettuce.
Indian lettuce is a broad term used to describe a number of Asian plants with leaves that differ in size and form. It is also known as the Goose vegetable, Tropical lettuce, Ku mak, Yao mak, Ku Mak Cai, Daun Panjang, and Sawi Rana.
Both taproots and fibrous root systems are possible in lettuce plants. Domesticated species' leaves occur in a variety of hues, ranging from pale green to dark red and purple; variegated kinds have also been created.
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The complete question is ''As you were taking lettuce in the grocery store, you were surprised when water sprinklers suddenly went on, spraying fresh water on the produce. When you got back home, you immersed the lettuce in a salt solution, and within several minutes they became limp and soft. What are the explanations for the spraying procedure in the store, and your observation at home?
A. Lettuce cells are hypotonic to fresh water making them turgid and fresh-looking, but hypertonic to the salt solution, hence plasmolyzed.
B. Lettuce cells are isotonic to fresh water making them turgid and fresh-looking, but hypotonic to the salt solution, hence plasmolyzed.
C. Lettuce cells are isotonic to fresh water making them turgid and fresh-looking, but hypertonic to the salt solution, hence plasmolyzed.
D. Lettuce cells are hypertonic to fresh water making them turgid and fresh-looking, but hypotonic to the salt solution, hence plasmolyzed.
please help me consider the value of A with significant figures
Answer:
11.5 okkkkkkkkkkkkkkkkkkkkkkkkkkkk chutita
What is the name of a substance that contains a useful element which can be extracted from it?
The substance is known as an ore.
We can define an ore as a mineral from which useful elements can be extracted economically and it contains valuable substances.
As an example for aluminum, the feldspars can be treated as an ore (NaAlSi3O8, KalSi3O8, & CaAl2Si2O8 ), from feldspars we can extract aluminum economically,
Gangue is another type of mineral which don't contain valuable substances.
There are four types of ores ,
Ores Oxides Ores CarbonateSulphide OresOres Halides.To know more about ores visit,
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......................
Answer:
The real answer is ...................... .
Lesson 1, proportys of matter
Answer:Mass, weight, and volume
Explanation:All matter has certain properties that define it. There are six major physical properties. In order for us to measure or observe them, we do not need to change the composition of the substance. The six physical properties are color, density, volume, mass, boiling point, and melting point.
Calculate the maximum wavelength of light capable of dissociating the cl–f bond in one molecule of chlorine monofluoride if the bond energy, or bond dissociation energy, is 251 kj/mol.
According to bond energy, the maximum wavelength of light is 475 nanometers.
We need to know about bond energy to solve this problem. Bond energy is the energy needed to bond other atoms in the molecule. To determine the energy in one molecule of chlorine monofluoride, we can use this formula:
E = BE / Na
where E is the energy of photon, BE is bond energy and Na is Avogadro's number (6.02 x 10²³ atoms/mol)
Now, we can calculate the shortest wavelength by using Einstein's equation for photon energy:
E = h . c / λ
where h is Planck constant (6.6 x 10¯³⁴ J.s), c is the speed of light (3 x 10⁸ m/s) and λ is the wavelength.
From the question above, we know that
BE = 251 kJ/mol = 251 x 10³ J/mol
By substituting the given parameters, we can calculate the maximum wavelength
E = BE / Na
h . c / λ = 251 x 10³ / 6.02 x 10²³
6.6 x 10¯³⁴ . 3 x 10⁸ / λ = 251 x 10³ / 6.02 x 10²³
λ = 4.75 x 10¯⁷ m
λ = 475 nm
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What is the trend in the ionic charges of the elements in groups 1, 2 and 13 of the periodic table (I will be giving brainliest to whoever gives the best answer and explains it)
Group 1: 1+
Group 2: 2+
Group 13: 3+
Explanation:The charges of the ions are dependent on the number of valence electrons.
Valence Electrons
Group 1 has 1 valence electron, group 2 has 2, and group 13 has 3. It is important to remember that elements will attempt to have a full valence shell. They may either attempt to lose all of their valence electrons or fill the energy level with 8 electrons.
Since all of these groups have less than 4 valence electrons, they will attempt to lose their valence electrons.
Determining Charges
When atoms lose electrons, they gain a positive charge. Since all of these elements will lose electrons, all of the ions will be positive, also known as a cation.
The positive charge of an element is equal to the number of electrons the atom loses. This means that group 1 will have a 1+ charge because it loses 1 electron. Continue this pattern to determine that group 2 will have a 2+ charge and group 13 will have a 3+ charge.
Can somebody help with this question please
When a metal is oxidized, its mass remains the same.
What is oxidation of metals?
oxidation of metals is a chemical reaction of the metal surface with the oxygen present in the air that causes some of the metal to corrode or oxidize and form the respective metal oxide on the surface.
The oxidation reaction of a metal is given as;
Y⁺ˣ + O²⁻ = Y₂Oₓ
where;
Y is the metalO is the oxygenA metal oxidizes by losing electron, this will not affect the mass of the metal since electrons have negligible masses.
Also, based on the law of conservation of mass, mass of the metal can neither be created nor destroyed but can be transformed from one form to another.
Thus, when a metal is oxidized, its mass remains the same.
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The hardness of water is expressed as ppm of calcium carbonate (CaCO3). In a sample analysis of water from a spring, a hardness between 80 and 100ppm of CaCO3 was reported. What would be the equivalence of these values, expressed as a percentage of CaCO3?
The equivalence of these value is 1.75 × 10⁻³ M.
What is equivalence ?Hardness = 175 mg CaCO₃/L
or mass of CaCO₃ in 1 L = 175 × 10⁻³ grams
Now,
Molar mass of CaCO₃ = 40 + 12 + ( 3 × 12 ) = 100 grams/mol
The concentration of CaCO₃ = number of moles / volume
or
= (175 × 10⁻³ / 100) / 1
or
= 1.75 × 10⁻³ M
Now,
CaCO₃ ⇒ Ca²⁺ + CO₃²⁻
1.75 × 10⁻³ M 1.75 × 10⁻³ M 1.75 × 10⁻³ M
thus,
the concentration of Ca²⁺ ions in water = 1.75 × 10⁻³ M
An equivalency relation on a set S is a transitive, symmetric, and reflexive relation on S. A square and a triangle cannot be superimposed since they are not equivalent in force, quantity, or value or in area or volume.
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Polyacrylamide is a water-soluble polymer whose aqueous solution containing 25 g/l develops an osmotic pressure of 0. 54 torr at 25◦c. Find the approximate molecular weight of the polymer sample.
A student, Ken, is given a mixture containing two nitrate compounds . The mixture includes NaNO3 and Ca(NO3)2 . The mixture is 73.68% NO3 is by mass. What is the mass percent of NaNO3 in the mixture?
The mass percent of NaNO₃ in the mixture of the nitrate compounds 35.93 %.
What is the mass percent of NaNO₃ in a mixture of two nitrate compounds which includes NaNO₃ and Ca(NO₃)₂?The mass percent of NaNO₃ in a mixture of two nitrate compounds which includes NaNO₃ and Ca(NO₃)₂ is calculated as follows:
Mass percent of NO₃ = 73.68%
The number of parts of NO₃ in the mixture is 3 parts; 2 parts from Ca(NO₃)₂ and 1 part from NaNO₃.
1 part NO₃ = 73.68 %/3 = 24.56 %
Ca + Na = 100 - 73.8 = 26.2 %
molar mass of Ca = 40
molar mass of Na = 23
mass percent of Na = 23 * 26.2/53
mass percent of Na = 11.37 %
mass percent of NaNO₃ = 11.37 % + 24.56 %
mass percent of NaNO₃ = 35.93 %
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HELP PLEASE!!!! Nitrogen has two isotopes, N-14 and N-15, with masses of 14.0031 amu and 15.001 amu respectively. If the atomic mass of nitrogen is 14.00674 amu, what is the abundance of each isotope? I
(If there is any work please include that in your answer so I get credit thank you)
The atomic mass of an element is a weighted average of its isotopes in which the sum of the abundance of each isotope is equal to 1 or 100%.
Let fraction of N-15 be x
then fraction of N-14 = 1-x
Formula for Calculating Isotope:
15.001x + 14.00031(1-x)=14.0067
on calculation:
x = 0.006403
so, % = 0.006403 x 100 = 0.6403 %
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Ionic compounds can be made from a metallic ion and a nonmetallic ion. Metallic ions are positive (cations). Nonmetallic ions are negative (anions). For each equation given below, enter the sum in the space provided.....
Answer:
Since metals have more number of electrons therefore, they donate extra electron(s) in order to gain stability. Whereas non-metals have less number of electrons than metals. Hence, non-metals readily gain electron(s) in order to gain stability.
Sum for the mentioned entries are as follows.
(+1) + (-1) = 1 -1 = 0
(+2) + (-2) = 2 - 2 = 0
2(+1) + (-2) = 2 - 2 = 0
(+3) + 3(-1) = 3 - 3 = 0
3(+2) + 2(-3) = 6 - 6 = 0
Use the vent diagram below to identify where the listed characteristics belong.
The protons and neutrons' properties are depicted in the vent diagram.
Venn diagram :
The visual representation of information is represented by a Venn diagram. The proton and neutron are depicted in the provided Venn diagram.
The positive charge of a proton. The nucleus contains both protons and neutrons. The identity of the atom is determined by the proton.
Neutrons have a neutral charge. It contributes to the mass of the atom.
Therefore, The protons and neutrons' properties are depicted in the vent diagram.
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Name the gas released when group 1 elements react with water
Answer:
Hydrogen Gas
the chemical formula is H2
Answer:
hydrogen gas
Explanation:
Na + H20 -------> Na20 +H2
How many 325 mg aspirin tablets can be made from 875 g of aspirin?
The number of aspirin tablets that can by made from 875 g of aspirin in which one aspirin tablet has 325 mg of aspirin is 2692 tablets.
Amount of aspirin present in 1 tablet = 325 mg
Total Amount of Aspirin present = 875 g.
Convert 875 g into mg.
1 g = 1000 mg
875 g = 875x 1000 mg = 875000 mg
Hence, Total Amount of Aspirin present = 875000 mg
Number of tablets made from 325 mg of aspirin = 1
So, the number of Aspirin tablets that can be made from 8750o0 mg aspirin = 875000 x (1/325)
= 875000/325 = 2692 tablets
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Calculate the energy of blue light(425nm). What is the energy of a mole of blue photons?
The energy of a mole of blue photons is determined as 4.68 x 10⁻¹⁹ J.
What is the energy of a photon?
The amount of energy carried by a photon is directly proportional to the photon's electromagnetic frequency and inversely proportional to the wavelength of the photon.
E = hf
E = hc/λ
where;
f is the frequency of the blue lightλ is wavelength of the blue light = 425 nmc is the speed of the blue lighth is Planck's constantThe energy of a mole of blue photons is calculated as follows;
E = (6.626 x 10⁻³⁴ x 3 x 10⁸) / (425 x 10⁻⁹)
E = 4.68 x 10⁻¹⁹ J.
Thus, the energy of a mole of blue photons is determined as 4.68 x 10⁻¹⁹ J.
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Complete the following word equations and indicate the state of matter for each reactant and product.
copper sulfate + ammonium hydroxide
zinc + copper sulfate
magnesium + sulfuric acid hydrogen +
copper oxide + sulfuric acid water +
Answer:
Explanation:
1. Ammonium hydroxide and copper sulfate reaction is a double displacement reaction. This equation can be written as: CuSO4+➡(OH)2+(NH4)2SO4.
2. Zinc displaces copper from copper sulfate and generates zinc sulfate solution when added to CuSO4 solution because zinc is a more reactive metal that displaces less reactive metal from its solution. Equation: Zn+CuSO4 ➡ ZnSO4+Cu.
3. Magnesium combined with sulfuric acid produces magnesium sulfate and hydrogen gas. For this reaction, we have a neutralization reaction. Equation: 2Mg+2H2SO4 ➡ 2MgSO4+2H2.
4. Copper (II) oxide, is a black solid, which, when reacted with sulphuric acid creates a cyan-blue-colored chemical called copper II sulfate. Copper (II) oxide reacts with sulfuric acid to create water and copper (II) sulfate. Equation: CuO + H2SO4 = CuSO4*H2O
A recipe requieres 500Ml of chicken broth. Convert this volume to gallons.
which is the best example of immiscible liquids? two polar liquids that have high surface tensions a polar liquid and a nonpolar liquid that have low surface tensions two nonpolar liquids that can dissolve into one another
A polar liquid and a nonpolar liquid that don't mix together is the best illustration of immiscible liquids among those mentioned above.
what are immiscible liquids?Liquids that are immiscible do not combine to generate another liquid
Here are a few more instances of immiscible liquids:
The kerosene and water mixtureswater and palm oil combinedwater and peanut oil combinedpetrol and waterContrarily, miscible liquids are two liquids that can mix together to make one larger liquid.
Therefore, a polar fluid and a nonpolar fluid that are unable to melt into one another are the greatest examples of immiscible liquids from the alternatives above.
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which element its oxide dissolves in both acids and alkalis
Answer:
Aluminum and Zinc
Explanation:
Amphoteric oxides have both acidic and basic properties. The oxides of aluminium and zinc are examples. They form salts when they react with acids. They also react with alkalis to form complex salts.
when put out a fire that threatens to be ahazard to which part of flame should be aim the extinguisher
The fire extinguisher should be aimed at the base of the flame.
A fire extinguisher is an active safety tool that is frequently used in emergencies to put out or control minor flames.
The most crucial thing to remember while utilizing a fire extinguisher is to keep your distance and aim towards the fire's base.
The majority of untrained individuals are prone to point fire extinguishers at the flames, however doing so causes the extinguishing ingredient to flow into the flames, rendering the entire procedure ineffectual. It's crucial that the extinguishing agent reaches the fire's foundation.
A fire extinguisher typically consists of a hand-held cylindrical pressure vessel that may be discharged with a chemical to put out a fire.
There are five basic types of fire extinguishers: wet chemical, dry powder, carbon dioxide, foam, and water.
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What is the name of a substance that contains a useful element which can be extracted from it?
The substance which contains useful elements which can be extracted from it is called ores.
The crust of the Earth contains some naturally occurring elements known as minerals, which comprise metal compounds.
Ores are mineral deposits from which metal may be economically and conveniently extracted. Generally, metals are not found in their natural state. Metals such as potassium, sodium, calcium, magnesium, and others are present in a combined state. Therefore, to obtain a pure form of metal, it must be extracted from these metal compounds. This process of extracting metal from the ore is known as Metallurgy. Remember that while all minerals are not ores, all ores are minerals.
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