From Smallest to Largest:
Br
I
Al
Ga
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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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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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
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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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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5.0 ml of 0.10 m solution of naoh is added to 30. ml of buffer solution of acetic acid (0.093m) and sodium acetate (0.12 m). what is the ph of new solution? ka
5.0 ml of 0.10 m solution of Naoh is added to 30. ml of buffer solution of acetic acid (0.093m) and sodium acetate (0.12 m), then the pH of the solution is 4.72
The pH of the solutionCH3COOH +H2O → H3O+ + CH3COO-
ka = [H3O+] {CH3COO-] / [CH3COOH] [H2O]
⇒ [H3O+] = ka X [CH3COOH] / [CH3COO-] → 1
Let us consider the concenration of H3O+ at equilibrium = x
Thus, putting the values in equation 1
[H3O+] = ka X [CH3COOH] / [CH3COO-]
x = (1.8X 10^-5 X 0.00329) / (0.0031)
⇒ x = 1.91 X 10^-5
since x is the equilibrium concentration of H3O+, SO
equilibrium concentration of H3O+ = 1.91X 10^-5
Then pH = -log10 {H3O+}
= -log10{1.91 X 10^-5}
=4.72
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In a combustion reaction 35.3 g of hydrocarbon reacts with 96.0 g of oxygen to produce water and carbon dioxide if 60.4 g of water is produced how much carbon dioxide is produced
The amount of CO2 is produced is 60.28 g
In this combustion reaction , O2 act as a limiting reagent
96.0 g O2 = 3.0 mol O2 is present for the combustion reaction.
In the combustion reaction 60.4 g of water is formed
60.4 g of Water = 60.4 g * 1 mol / 18 g = 3.35 mol
3.35 mol of H20 has 6.32 mol of H atoms.
If hydrocarbon acts like limiting reactant , then 35.5 - 6.32 g of carbon = 29.18 g that is equal to 2.12 mol.
2.12 mol of C requires 2.12 mol * 2 = 4.24 mol of atoms to burn completely O atoms.
3.35 mol of H2O atom + 4.24 of O atoms = 7.59 mol. So, O2 is a limiting reactant.
3.35 mol of O2 atoms are in H2O , 6 - 3.35 = 2.65 mol of O2 atoms are there in CO2. Hence 1.37 mol of CO2 is going to produced.
Mass of CO2 produced = 1.37 * 44 = 60.28 g
By the law of conservation mass we found that 19.13 g of hydrocarbons remains unburnt.
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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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When the following equation is balanced, what is the coefficient in front of Rb3PO4?
Ca3(PO4)2 + Rb₂0 ➜ CaO + 3 Rb3(PO4)
A) 1
B) 2
C)3
D) 4
Answer:
C
Explanation:
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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PLEASE HELP ITS DUE TOMORROW IM GIVIN 40 POINTSSS AND WHOEVER ANSWERS FIRST CORRECTLY GETS BRAINLIEST!!!
Of the plates thats are facing the Sun (plates A through G) which ones will receive the most solar energy???
Suppose naoh standardization of khp determined that a volume of 25. 00 ml naoh has a concentration of 0. 049 m. Suppose 22. 20 ml of khp was used to get to the endpoint in this standardization. What is the mass of khp dissolved in 50. 00 ml of the standardization khp titrant?.
The mass of KHP that was dissolved in 50.00 mL of the standardization titrant is 0.5634 g.
1 mol of KHP reacts with 1 mol of NaOH, which would mean that the amount of NaOH used is equal to the amount of KHP in the sample. We can use this to calculate the number of moles:
c = n/V, so n = c * V = 0.049 M * 0.025 L = 0.001225 mol of NaOH and KHP
Using this amount, we can then calculate the KHP moles in the sample of the standardization titrant:
22.20 mL : 0.001225 mol = 50.00 mL : X
X = 0.001225 mol * 50.00 mL / 22.20 mL = 0.002759 mol
Then, by using the M value of KHP (204.22 g/mol), we obtain the mass of KHP of the sample:
n = m/M, so m = n * M = 0.002759 mol * 204.22 g/mol = 0.5634 g
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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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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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What forces must limestone be exposed to in order to change into marble?
O erosion
O compaction and cementation
O heat and pressure
O melting and cooling
The forces to which limestone must be exposed to in order to change into marble is (c) heat and pressure.
Limestone has calcium carbonate in it. So, the chemical formula for this is CaCO₃. When it is burnt it gives lime. It is a sedimentary rock.
Sedimentary rocks are those rocks which are formed from deposition of already existing rocks of fossils on the surface of the earth.
Marble also has calcium carbonate in it. So, the chemical formula for this is also CaCO₃. It is a metamorphic rock.
Metamorphic rocks are formed when they have to face harsh conditions like heat and pressure etc.
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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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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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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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Choose the best match for each description. You can use each term once. ASAP
Answer: I hope this helps.
Explanation:
3. Give 2 examples of intensive properties
Answer:
examples of intensive properties are colours and density
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
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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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 :)
Explain how NaOH forms a basic solution when it dissolves in water.
When the base sodium hydroxide dissolves in water, sodium and chloride ions are formed.
What is base?Any material that is slippery to the touch, tastes unpleasant, alters the colour of indicators (such as turning red litmus paper blue), combines with acids to generate salts, and facilitates certain chemical processes is considered a base in chemistry (base catalysis).
When the base sodium hydroxide dissolves in water, sodium and chloride ions are formed.
Since sodium hydroxide is an inert solid in itself, its ions do not impart any colour to the solution when it dissolves in water. So, a colourless solution is produced when sodium hydroxide is added to water.
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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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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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A copper penny has a mass of 3.1 grams and a density of 8.86 g/mL. What would be the volume of this penny?
Answer:
0.350cm³
Explanation:
to obtain volume, divide density by
3.1÷8.86
0.350ml
1ml=1cm³
0.350ml=0.350cm³
You need to get to class, 300 meters away, and you can only walk in the hallways at about 1.5m/s.(if you run any faster, you’ll get caught running). How much time will it take to get to your class
200 sec or 3 min 20 msec
we need to get to class, 300 meters away,
so the distance becomes = 300 m
we can only walk in the hallways at about 1.5m/s
so the time become = 1.5m/s
time will it take to get to our class
time = distance/speed
time = 300/1.5
time = 200 sec or 3 min 20 msec
Distance is the parameter to use either length or breadthS.I unit of distance is meter, although we use other unit too, like kilometer or milimeter or decameterDistance is actual the total distance a person travelled or coveredTo know more about Distance visit :
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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