The bohr model describes that the electron is possible outside the nucleus of an atom. Electrons are negatively charged exist in orbits around the nucleus.
Because we assume that the only source of centripetal force is the nucleus's electrostatic force of attraction when we calculate the formula for a radius, energy levels, etc. Therefore, this only applies to atoms with a single electron. Repulsion caused by other electrons will also exist in multi-electron atoms.
Hydrogen atoms contain one electron, which is located outside the nucleus. With two protons, helium will also have two electrons.
The limitation with Bohr's model is that it performs admirably for atoms with just one electron, such as H or He+, but appallingly poorly for atoms with multiple electrons.
The atom of hydrogen possesses only one electron which are present outside the nucleus.
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Is the anser A b c or d
An object can accelerate only when there is a net force being applied.
As we can see in the image given in question that object 1 has forces with identical magnitude of forces being applied to opposite sides. The two opposite forces with identical magnitude will cancel the effect of each other on the object 1 and the net force on object 1 will be zero. And for this reason object 1 remains stationary.
In another case object 2 has forces with different magnitudes being applied to opposite sides. As the magnitude of forces applied on object 2 are different, these opposite forces after cancelation will have some net force acting on object 2. For this reason object 2 is accelerating. So, option a is correct i.e., An object can accelerate only when their is net force being applied.
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How many molecules of water are required for the hydrolyzation of a polymer that is 22 monomer-long cellulose molecule?.
21 molecules of water are required for the hydrolyzation of a polymer that is 22 monomer-long cellulose molecule.
For hydrolyzation of 22 monomer-long cellulose molecule, 21 molecules of water are required. As for three monomer polymer there are 2 bonds so we require two water molecules.
The process of hydrolyzation is a step-by-step reaction in which-
The first step is the condensation of one glucose molecule to produce a 2 monomer-long chain, which releases one molecule of water.
The second step is reaction between the 2 monomer-long chain with other glucose molecule, which release an extra molecule of water.
These steps are repeated until 21 condensation reactions occurs, to give 22 monomer-long cellulose molecule.
The OH group from first monomer of the glucose unit and H group from second monomer is removed in the form of water molecules, when polymer bond is formed.
The reaction is known as the condensation reaction. It is referred to as the loss of water in a chemical reaction.
Therefore, 22 monomer long cellulose molecule indicates 21 reactions of condensation with release of 21 molecules of water.
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What is true about these two pictures? PLS HELP ME
Both A and B are molecules.
Both A and B are elements.
A is a compound, but B is an element.
A is an element, but B is a compound.
Answer:
Both A and B are molecules.
when people throw a coin in a fountain why do the coins drop to the bottom of fountain
The coin drops to the bottom of the fountain because of its density.
Density influences why some things float while others sink. Objects with tightly packed molecules are denser than those with loosely packed molecules. If an object's density is higher than that of water, it sinks in the water, and if it is lower than water, it floats. It means lighter objects float while heavier objects sink in water.
The molecules in the coin are more tightly packed, therefore its density is greater than that of water. It means the coin is heavier than water. As a result, when people throw a coin into a fountain, it sinks to the bottom since heavy objects tend to sink in water.
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8. Given a sample of gas at SATP, determine the final pressure if the temperature is heated to 45°C and
the volume remains constant.
1.06 atm
A sample of gas at STP,
what will be the final pressure if the temperature is heated to 45°C and
the volume remains constant.
as per above statement , we got
pressure = 1 atm
volume = v
temperature = 298 k ( k stands for kelvin)
now, we have to find the final pressure as temperature increases to 318 kelvin and volume remain sames.
so, now, by applying ideal gas equation,
PV = nRT
here n and R is constant , so we neglect it,
now equation become
P1V/T1 = P2V/T2
Now, putting all the values
1/298 = p2/318
p2 = 318/298
p2 = 1.06 atm
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For which question could a scientist develop a testable hypothesis?
Which grocery store is the best?
When will dinosaurs roam Earth again?
Do all kinds of wood float in water?
Should everyone use solar-powered cars?
The question that a scientist can develop a testable hypothesis is as follows: Do all kinds of wood float in water? (option C).
What is a hypothesis?A hypothesis is a tentative conjecture explaining an observation, phenomenon or scientific problem that can be tested by further observation, investigation and/or experimentation.
The construction of hypothesis is a vital component of any experiment, which must be testable.
However, prior to the construction of hypothesis, a scientific question must be asked.
According to this question, the question that a scientist can develop a testable hypothesis is as follows: Do all kinds of wood float in water? The testable hypothesis will be to use different wood on water.
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minant in horses, and curly hair is recessive. Black hair is dominant, and chestnut hair is r
enotes black and b denotes chestnut, classify the alleles according to their types.
SS
BB
bb
Ss
Bb
Homozygous
Dominant
SS
Heterozygous
Homozygous
Recessive
Genotypes ratios are 1 : 2 : 1 for brown yellow tannish and white horse
The term "genotype" broadly refers to an organism's genetic make-up; in other terms, it characterizes an organism's whole gene pool. The phrase can also be used to describe to the genotypes, or different versions of a genome, that an organism carries in a more specific meaning.
Genotypes are as follows:
brown horses are BB
white horses are bb genotype
yellow-tannish colored horse are Bb genotype
Brown × White (Bb× bb)
100% Bb genotype
Brown × Yellow tannish colored horse(BB × bb)
25% BB, 50% Bb, 25% bb
Hence, The ratio which the brown yellow tannish and white horse holds are as follows
1 : 2 : 1
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Cells communicate via chemical signals which bind to specialized molecules on the plasma membrane surface. these molecules are called _____.
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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The density of enthanol is 0.789 g/ml at 20 c what is the mass of a sample of ethanol at this temperature that has a volume of 175.0 ml?
The mass of a sample of ethanol at 20°C is with volume 175.0 mL and density 0.789 g/mL is 138.075 g.
Density is defined as the mass of a substance per unit volume. It is denoted by ρ.
The mass of a substance when the density and volume is given can be found by using the formula -
Density = mass
volume
ρ = m
v
Given data -
volume of ethanol = 175.0 mL
density = 0.789 g/mL
So, the mass is -
Mass = density x volume
mass = 0.789 g/mL x 175.0 mL
mass = 138.075 g
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A graduated cylinder has a mass of 80.0 g when empty. When 20.0 mL of water is added, the
graduated cylinder has a mass of 100.0 g. If a stone is added to the graduated cylinder, the water level rises to 45.0 mL and the total mass is now 156.0 g. What is the density of the stone?
Answer:
2.24g/
Explanation:
mass of water is found by getting 5he extra mass the cylinder gained after adding
100g-80g=20g - mass of water
Density of water: 1g/cm³ that means that 20g water has a volume of 20cm³
1cm³=1ml; 20cm³=20ml
volume of stone is the extra height the water gained: 45ml-20ml =
25ml
mass of stone is the extra mass now earned:
156g-100g=56g
Density of stone=mass of stone÷divide by volume of stone
56g÷25ml=
2.24g/ml
2. To what temperature must 0.588 moles of NH3 gas have to be heated in a 15.0 L container in
order for it to exert a pressure of 3.50 atm?
Considering the ideal gas law, to a temperature of 1088.85 K or 815.85°C must 0.588 moles of NH3 gas have to be heated in a 15.0 L container in order for it to exert a pressure of 3.50 atm.
Ideal gas lawIdeal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:
P×V = n×R×T
Temperature of NH₃In this case, you know:
P= 3.50 atmV= 15 Ln= 0.588 molesR= 0.082 [tex]\frac{atm L}{mol K}[/tex]T= ?Replacing in the definition of ideal gas law:
3.50 atm× 15 L= 0.588 moles×0.082 [tex]\frac{atm L}{mol K}[/tex]×T
Solving:
(3.50 atm× 15 L)÷ (0.588 moles×0.082 [tex]\frac{atm L}{mol K}[/tex])= T
1088.85 K= 815.85 C= T (being 273 K= 0 C)
Finally, to a temperature of 1088.85 K or 815.85°C must 0.588 moles of NH3 gas have to be heated in a 15.0 L container in order for it to exert a pressure of 3.50 atm.
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The answer is: To think of different kinds of materials to use
Glass, Metal, Wood, Ceramic, Plastic are different kind of materials to be used.
Glass is versatile material, which is made up of sand and silicon dioxide. Most familiar glass today is soda-lime silica glass. they have properties like hardness, transparency and heat resistance.
Metals are the important materials found in earth and they are used in a vide variety of applications. Aluminium, iron and copper are some of the examples of metals. they can combined together to makes alloys. they have properties like conductivity, lustre and malleability.
Wood is the most common and easily available material. two kinds of wood are there hardwood and softwood. they are used in construction and as fuel for burning.
Ceramic are substances which are inorganic and non-metallic in nature. they are used to make pots, vessels etc. they are hard, heat resistant, and resistant to corrosion
Plastic are up of long chain of molecules. they are used in the production of variety of substances.. there are different types of plastics. they are cost friendly, strong and durable, resistant to water and electricity.
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Marco put a pot of water on to boil eggs. after a few minutes all the water was This is an example of _____.
Multiple choice question.
A)
condensation
B)
deposition
C)
sublimation
D)
vaporization
Answer:
D) vaporizationExplanation:
Marco put a pot of water on to boil eggs. after a few minutes all the water was dry
This is an example of vaporization.hopefully this helps you!
Inside Earth, it is very hot and this source of heat called
Answer:
Geothermal energy
Explanation:
Hope that helps !!!
Select the correct answer.
The potential energy for a mass on a spring is proportional to the square of which of these quantities?
Ο Α.
OB.
O C.
OD.
O E. velocity
mass
frequency
period
displacement
The potential energy for a mass on a spring is proportional to the square of Displacement.
Potential energy is present in a spring is because applying a force to deform a spring.
The elastic potential represented by U and S.I unit is J
Elastic potential energy is given by:
U = 1/2 kx²
The elastic potential energy is directly proportional to the square of the change in length or displacement and spring constant.
k is spring constant
x is the displacement
as x increases potential energy increases.
Thus, The potential energy for a mass on a spring is proportional to the square of Displacement.
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When incorporated into a polypeptide chain not at the n or c terminus, _______ would make the charge of the polypeptide more positive.
When incorporated into a polypeptide chain not at the n or c terminus, Arginine would make the charge of the polypeptide more positive.
Do humans require arginine?Because arginine is an essential amino acid for young organisms' optimal growth and development, it must be provided in the diet. Arginine is a conditionally essential amino acid for adults, particularly in conditions such as trauma, burn injury, small-bowel resection, and renal failure.L-arginine is an amino acid that aids in protein synthesis in the body. It also causes nitric oxide to be released into the bloodstream. According to a 2016 review, nitric oxide acts to widen blood vessels in the bloodstream, which may help with certain circulatory conditions. The substance also stimulates insulin release in the body.Because L-arginine relaxes blood vessels, it may benefit men suffering from erectile dysfunction (ED) caused by poor blood flow. It may improve the efficacy of medications such as sildenafil (Viagra). Taking L-arginine with ED medication may cause blood pressure to drop too low.To learn more about Arginine refer to
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Which sentence from the article BEST supports the idea that not all liquids evaporate at the same temperature?
A
The temperature at which a liquid turns into a gas is called its boiling point.
B
That same temperature can be considered the melting point if the temperature is increasing and causes a solid to become a liquid.
C
For example, liquid water turns to a solid form — ice — when it is cooled to 32 degrees Fahrenheit (0 degrees Celsius).
D
Different types of matter have different boiling, melting and freezing points.
The sentence which BEST supports the idea that not all liquids evaporate at the same temperature is: Different types of matter have different boiling, melting and freezing points; option D
What is evaporation?Evaporation is the process by which a liquid substance spontaneously changes to liquid.
Evaporation of a liquid is affected by the following factors:
the nature of the liquidthe boiling point of the liquidthe presence of windrelative humiditySubstances with low boiling point usually evaporate at a faster rate tan substances with higher boiling points.
However, due to the nature of various substances, different types of matter have different boiling, melting and freezing points. Thus, not all liquids evaporate at the same temperature.
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An object is traveling at a speed of 500.0 m/sec. How fast is that in km/hr?
Answer:
0.5km/hr
Explanation:
[tex]500.0 \div 1000[/tex]
this is because to get from n to KM you have to divide by 1000
Lizards have one. Elephants have one. Even
fish have one. You have one, too! What do you all
have? You all have skeletons.
Skeletons are the bones inside animals' bodies.
The skeleton is a frame that has muscles, blood
vessels, and skin wrapped around it. Skeletons
give vertebrates-humans and
many other
animals-their shape. You can identify many
animals just by looking at their skeletons.
Find the important details
Answer:
Most animals have skeletons that give those animals their shape. You can identify most of those animals by those same skeletons.
Explanation:
The passage
22. A
is a way of organizing data that is used to show
changes that occur in related variables.
Obar graph
O circle graph
Oline graph
O table
Answer:
line graphs
hope this helps :)
What is the molar mass of sodium aluminum sulfate decahydrate?
Answer:
the molar mass un the human body in a sodium is seman see inside the testicle there is little bits of chemical chemistry call sodium or codename seman and inside the seman thye dehydrate before they race so aluminum feeds them for preparation
Explanation:
a coffee-cup calorimeter contains 130.0 g of water at 25.1 ∘c . a 124.0-g block of copper metal is heated to 100.4 ∘c by putting it in a beaker of boiling water. the specific heat of cu(s) is 0.385 j/g⋅k. the cu is added to the calorimeter, and after a time the contents of the cup reach a constant temperature of 30.1 ∘c .
With the principle of calorimetry the total heat lost by the copper block is 3356.12 J and the heat gained by the water is 2719.60 J.
What is the principle of Calorimetry?A Calorimeter is a vessel made of copper with a stirrer of the same material. The vessel is kept in a wooden box to isolate it thermally from the surrounding. A thermometer is used to measure the temperature of the contents of the calorimeter. Objects at different temperatures are made to come in contact with each other in the calorimeter. As a result, heat is exchanged between the objects as well as with the calorimeter. Neglecting any heat exchange with the surrounding, the principle of calorimetry states that - the total heat given by the hot bodies equals the total the total heat received by the cold bodies.
Here in the question, we have water at [tex]T_w=25.1[/tex]°C and a block of copper metal at [tex]T_c=100.4[/tex]°C.
Mass of Water, [tex]M_w[/tex] = 130 g.
Mass of Copper, [tex]M_c[/tex] =124 g.
The contents of the calorimeter reach a constant temperature of T = 30.1° C.
Temperature of copper block, [tex]T_c=[/tex] 100.4°C.
Temperature of Water, [tex]T_w=[/tex] 25.1°C.
According to the principle of calorimetry, amount of heat gained or lost by the body is given by,
[tex]Q=M.C.(T_f-Ti)[/tex]
where,
[tex]M[/tex]= Mass of the body.
C = Specific heat capacity of the substance.
[tex]T_f=[/tex] Final temperature of the substance.
[tex]T_i=[/tex] Initial temperature of the substance.
Now, the heat lost by the copper block will be,
[tex]Q_c=M_c.C_c.(T-T_c)[/tex].
[tex]C_c=[/tex] 0.3875 J/g-K
So,
[tex]Q_c=[/tex] 124×0.385×(30.1-100.4)
[tex]Q_c=[/tex] -3356.12 J ; negative sign indicate that the heat is rejected.
Now, the heat gained by water will be,
[tex]Q_w=M_w.C_w.(T_w-T)[/tex]
[tex]C_w=[/tex] 4.18 J/g-K
So,
[tex]Q_w=[/tex] 130×4.18×(30.1-25.1)
[tex]Q_w=[/tex] 2719.60 J.
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Which phrase best describes the role carbon plays in the structure of compounds present in living things? no role no role a minimal role a minimal role a somewhat important role a somewhat important role a fundamental role
Carbon plays a fundamental role in the structure of organic compounds.
What role does carbon play in compound structure?Organic compounds are primarily composed of carbon. Carbon, like many other elements, can form stable bonds with itself. Organic compounds are classified into four types: carbohydrates, lipids, proteins, and nucleic acids.Without carbon, there would be no life on Earth. This is due, in part, to carbon's ability to easily form bonds with other atoms, which allows for greater flexibility in the form and function of biomolecules such as DNA and RNA, which are essential for the defining characteristics of life: expansion and replication.Carbon helps to regulate the Earth's temperature, allows all life to exist, is a key component of the food we eat, and is a major source of energy for our global economy.Carbon's ability to form stable bonds with many elements, including itself, is the reason for this. This property enables carbon to form a wide range of extremely large and complex molecules.To learn more about carbon play in compound structure refer to
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The usual soda pop can contains 360 mL. How many such cans could be filled from one 2.0 L bottle?
If there is a usual soda pop that contains 360 mL then the number of cans that can be filled from 2.0 L bottle are 5.5 pop cans.
Amount present in one soda can = 360 mL
Total amount present = 2.0 L
Convert 2.0 L into mL
1 L = 1000 mL
2.0 L = 2.0 x 1000 mL
= 2000 mL
So, the total amount = 2000 mL
Number of can using 360 mL = 1
The number of soda pop cans that can be filled using 2000 mL
= 2000 x (1/360)
= 2000/360 = 5.5 pop cans
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How to convert a velocity of 2.03x10 to the -9 cm/min. to m/s.
The velocity in m/s will be 0.03 x 10^-11 m/s
2.03x10^-9 cm/min x 1 m/100 cm x 1 min/60 sec =
0.03 x 10^-11 m/s
What is Velocity ?As a vector measurement of the rate and direction of motion, velocity is defined. Velocity can be defined as the rate of movement in one direction. Velocity may be used to calculate the speed of a car moving north on a major motorway and the speed of a rocket launching into space.
There are several various forms of velocity, including uniform, variable, average, and instantaneous.According to the equation v = s/t, velocity (v) is a vector quantity that quantifies displacement (or change in position, s), over change in time (t).Learn more about Velocity here:
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3. Give 2 examples of intensive properties
Answer:
examples of intensive properties are colours and density
If a student did not completely dry the erlenmeyer flask after heating and letting it cool and obtained the mass, how would this specifically affect the calculated mw in the mw by vapor experiment?
If the student do not completely dry the Erlenmeyer flask after heating and let it cool and obtains the mass, then the results will not be accurate.
It is necessary to dry the flask before calculating the mass, since the water particle in the flask will increase the volume of acid which will give change in the concentration of the acid.
And so it is 100% sure that the student will get wrong results.
To avoid such mistakes in the results, flasks must be dried up properly in an electric oven between 80°C to 90°C or by rinsing the flasks with a volatile solvent which can evaporate within few seconds and hence gives moisture free dried flasks.
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A 2.00g sample of C2H5OH undergoes condensation. The molar enthalpy of vaporization, ΔHvap, of C2H5OH is +38.6kJ/mol. Which of the following best identifies the change in enthalpy in the phase transition?
A) +19.3 kJ
B) +77.2 kJ
C) -19.3 kJ
D) -77.2 kJ
The change in enthalpy in the phase transition is -1.6598 KJ/mol.
As the enthalpy of vaporization and enthalpy of condensation are just the same with only difference being in their signs.The enthalpy of condensation of ethanol is -38.6 KJ/mol .For 2 g sample the enthalpy is calculated as,
number of moles of ethanol=2/46=0.043 moles
38.6 KJ of heat is absorbed for condensation of one mole of ethanol.
Therefore,heat absorbed for condensation of 0.043 moles of ethanol is,
-38.6×0.043=-1.6598 KJ
What is enthalpy of condensation?The enthalpy of condensation is defined as amount of heat which is released when a substance undergoes transformation from gas to liquid phase.Less energy is required to change from solid to liquid than from a liquid to gas.It has units of KJ/mol.
Condensation is an exothermic process as heat is absorbed and is given off from the system into the surroundings. It possesses values which are always negative.
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Your question is incomplete, but most probably the options were:
A)+19.3 KJ
B)+77.2 KJ
C) -19.3 KJ
D)-77.2 KJ
E)-1.6598 KJ
Why is the ocean cold in the day but warm at night?
In the day time the ocean absorbs the sunlight which is coming from the sun and at the night time the sun is not present so then the ocean releases that warmness.
Why is the ocean cold in the day but warm at night?
The heat that the ocean absorbs is blended with the lower water quickly. That blending spreads the heat round. At night, at the same time as the land cools off quickly, the water on the surface is saved hotter because the water is mixed round with the hotter water underneath.
It is courtesy of the ocean breeze effect. countrywide weather service meteorologist Walter Drag explains that it takes place due to the distinction among the warm air over land and funky air soaring over the ocean .
So we can conclude that in the day time the ocean absorbs the sunlight which is coming from the sun and at the night time the sun is not present so then the ocean releases that warmness.
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Which of the following does not describe a physical property of iron?
A
B
C
D
Iron is silvery-white or gray in color.
Iron has a boiling point of about 3,000°C.
Iron is a magnetic element.
Iron and sulfur react to form iron sulfide.
BACK
Answer:
D: Iron and sulfur react to form iron sulfide.
Explanation:
To make iron sulfide you need to combined Iron and Sulfur atoms, producing a chemical reaction.