Answer:
14.9 moles of water
Explanation:
Given data:
Number of molecules of water = 9.0×10²⁴ molecules
Number of moles of water = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules of water
9.0×10²⁴ molecules ×1 mol / 6.022 × 10²³ molecules
1.49×10¹ moles
14.9 moles
Which one is the right answer?
Answer:
a) p waves travel slower then 5 waves
I need answers
Question 2 (2 points)
Which of the following is an example of BALANCED forces?
A ball rolling uphill
O A ball sitting motionless on the ground
O A ball bouncing on the ground
O A ball rolling downhill
Answer:
Concepts: Physical Forces
In order for an object to be balanced, then it must be in equilibrium which means that no additional forces are being exerted. A ball sitting motionless would result in a balanced force that exerts no additional forces.Describe two ways the material in illustrates the importance of creativity in scientific investigations
Answer:
J.J Thompson make use of creativity to explain cathode ray tube experiment.
Also, creativity was used by Daltons to explain Joseph Proust's work.
Explanation:
This problem is all about the the beginning part of chemistry that is the atomic theory. The atomic theory was starts from the time of people like Democritus and down to people like J.J Thompson and John Dalton. Although it has been registered and credited that Dalton is the father of atomic theory many people has also worked on it before him for instance person like Joseph Proust. The reason behind this because some works that has been done by other people such as Democritus[who was the first person to start atomic studies] does not have any scientific evidence.
Creativity is needed when it concerns scientific research and investigation. This is what scientists such as John Daltons and J.J Thompson have used. J.J Thompson make use of creativity to explain cathode ray tube experiment. Also, creativity was used by Daltons to explain Joseph Proust's work.
Write True/False against the following statements and also correct the false statement.
Greater the calorific value better is the fuel.
Answer:
I think it is true you should go for true
What is the correct order of the scientists in order of their work related to the structure of an atom from earliest to most recent?
Neils Bohr, Ernest Rutherford, JJ Thomson, John Dalton, Democritus and Erwin Schrodinger
Erwin Schrodinger, JJ Thomson, John Dalton, Neils Bohr, Ernest Rutherford and Democritus
Democritus, John Dalton, JJ Thomson, Ernest Rutherford, Neils Bohr and Erwin Schrodinger
John Dalton, Neils Bohr, JJ Thomson, Democritus, and Ernest Rutherford and Erwin Schrodinger
PLEASE HELP !!!
Answer:
C. democritusm John dalton, JJ Thomason, Ernest Rutherford, Neils Bohr, and Erwin Schrodinger.
The correct order of the scientists in order of their work related to the
structure of an atom from earliest to most recent include Democritus, John
Dalton, JJ Thomson, Ernest Rutherford, Neils Bohr, and Erwin Schrodinger.
Democritus was regarded as one of the earliest scientist who first proposed
atomic theory around 460 BC which was then modified and used by others
such as John Dalton, JJ Thomson, Ernest Rutherford and Neils Bohr.
The most recent of them all was Erwin Schrodinger which was the wave
equation for electron movements in the 20th century.
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When a pendulum swings, at which point is kinetic
energy highest:
Answer:
3
Explanation:
which metal can be obtain from calvertie ores?
Answer:
Ore
hope this helps
thanks for the points
What variable represents specific heat in the equation Q = mCAT?
O A. The variable c
O B. The variable T
C. The variable m
O D. The variable Q
Answer:
the variable A represented specific heat capacity
Answer: The Variable T
Explanation:
Help pls!!! Thnk you
Answer:
521 nm
Explanation:
From the question given above, the following data were obtained:
Frequency (v) = 5.76×10¹⁴ s¯¹.
Wavelength (λ) =.?
RECALL: velocity (c) of light = 3×10⁸ m/s
Thus, we can obtain the wavelength of the green light by using the following formula:
c = vλ
3×10⁸ = 5.76×10¹⁴ × λ
Divide both side by 5.76×10¹⁴
λ = 3×10⁸ / 5.76×10¹⁴
λ = 5.21×10¯⁷ m
Next, we shall convert 5.21×10¯⁷ m to nanometer (nm). This can be obtained as follow:
1 m = 1×10⁹ nm
Therefore,
5.21×10¯⁷ m = 5.21×10¯⁷ m × 1×10⁹ nm / 1 m
5.21×10¯⁷ m = 521 nm
Thus, 5.21×10¯⁷ m is equivalent to 521 nm
Therefore, the wavelength (λ) of the photon of the green light is 521 nm.
Answer:
the wavelength (λ) of the photon of the green light is 521 nm.
How does the atomic radius of an element is related to its metallic character
Answer:
The large the atomic radius the more the metallic character of elements
Explanation:
The atomic radius is related to the metallic character in a way that the larger the atomic radius, the more metallic a body becomes.
Therefore, as we go down a group, metallic character increases.
Metallic character relies on the ability and willingness of an atom to share its valence electrons. As the size of an atom becomes large, the more metallic it is and the more its metallic character. In some other cases this character is known as electropositivity.What would you observe in the following cases:
(1) Sodium and potassium are placed in hot water
(ii) Burning magnesium is introduced into steam?
dium and iron with water
Answer:
See explanation
Explanation:
When introduced to hot water, sodium and potassium metals react violently to form a colourless solution and hydrogen gas. The metal becomes spontaneously ignited and burns with its characteristic flame colour.
Magnesium burns with a bright white flame to yield solid magnesium oxide
and hydrogen gas when steam is passed over heated magnesium.
The last question is not clear but I believe that it has to do with reaction of sodium and iron with water. Sodium reacts violently with cold water at room temperature to evolve hydrogen gas and aqueous sodium hydroxide.
Iron reacts with steam at red heat to yield hydrogen gas and Fe3O4
The simplest structures that can carry out all of the activities characteristic of life are
Answer:
Cells are the simplest structures that can carry out all of the characteristics activities of life.
Explanation:
All living things are made of cells and all cells come from other cells.
A ground water tank has its height 2m. Calculate the pressure at its bottom when it is completely filled with water.
The pressure at the bottom : 19600 N/m²
Further explanationGiven
A ground water tank has its height 2m
Required
The pressure at its bottom
Solution
Hydrostatic pressure is the pressure caused by the weight of a liquid.
The weight of a liquid is affected by the force of gravity.
The hydrostatic pressure of a liquid can be formulated:
[tex]\large{\boxed{\bold {P_h ~ = ~ \rho.g.h}}[/tex]
Ph = hydrostatic pressure (N / m², Pa)
ρ = density of liquid (kg / m³)
g = acceleration due to gravity (m / s²)
h = height / depth of liquid surface (m)
ρ = density of water (kg / m³) = 1000
g = acceleration due to gravity = 9.8 m/ sec²
The pressure
[tex]\tt P=1000\times 9.8\times 2=19600~N/m^2[/tex]
Which of the following is NOT an example of potential energy?
A. car moving down the highway
B. log on a fire
C. person standing on a diving board
D. liter of gasoline
Answer:
A. car moving down the highway
Explanation:
Potential energy is when the energy is being held in, as in, it is very still, and not moving.
When a car is moving down a highway, it is releasing kinetic energy, instead of potential.
help me pleaseeeee, if you do tyyy :)
Which term means that a metal can be made into wire?
A)
Luster
B)
Ductility
Malleability
D)
Conductivity
Answer:
c
Explanation:
i think
5.Summarize Which of the following is not an
advantage of using SI units?
A allows scientists to compare observations
and results
B can compare measurements made years
apart
C based on the number 5, which is easy to use
in calculations
D uses prefixes to express measurements that
are small or large
Answer:
C based on the number 5, which is easy to use in calculations
Explanation:
The SI unit system is not based on the number 5.
Characteristics of the water at the mountain source: Speed: Temperature Oxygen Level Nutrient Level
Describe the characteristics of the water at the mountain source:
Answer:
The answer is below
Explanation:
Speed: there will be faster speed due to the steep slope movement of water from the mountain.
Temperature: there will be lower temperatures as a result of the faster speed of water movement which reduces the influence of solar radiation on it.
Oxygen: the oxygen content is higher due to little or no residue particles present in it.
Nutrient Level: this is considered somewhat low as a result of the water coldness and speed which does not support the nutrition base to form.
workout the oxidation number of phosphorus in the following compound H3PO3
Answer:Phosphorus ahs an ocxidation number of 3. Phosphoric acid, H3PO3 has structure where there is one hydrogen (-H), two hydroxyl groups (-OH) and one oxgen (=O) attached to the central phosphorus P
Using the normal rules, H= +1, O = -2, OH = -1 and balancing out the "charges" we get P =+3
Explanation:
why is newtons first law of motion important to science plsss help :(
Explanation:
every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force
Answer: Newton's 1st law of motion explains how things move and how forces work on their movement, which makes it an extremely important discovery.
Explanation: If we were to place an object into space, we could observe how it behaves without any external influences.
What is the mass of an object that has a density of 2,86 g/mL and a volume of
75 mL
Answer:
214.5 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 75 × 2.86
We have the final answer as
214.5 gHope this helps you
help me pleaseeee, ty if you doo:))
Answer:
9 is the correct answer
How does one determine how much of a molecule is produced in a reaction?
O A. Oxidation states are used to calculate the number of product molecules.
B. The molar masses of the molecules tell how many grams of product will form.
O c. The coefficients and molar masses are used to calculate amounts of molecules
D. The mass of the products is determined by adding the mass of the reactants.
Answer:
c
Explanation:
i doubt it
The coefficients and molar masses are used to calculate the amounts of molecules. Hence, option C is correct.
What is a molecule?The smallest particle of a substance has physical and chemical properties of that substance. Molecules are made up of one or more atoms.
A molecule can be determined by how much is produced in a reaction through the coefficients and molar masses are used to calculate the amounts of molecules.
Hence, option C is correct.
Learn more about molecules here:
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Help me answer this plz.
Answer:
87.58 L of C₂H₂
Explanation:
We'll begin by calculating the number of mole in 250 g of CaC₂.
This can be obtained as follow:
Mass of CaC₂ = 250 g
Molar mass of CaC₂ = 40 + (12×2)
= 40 + 24
= 64 g/mol
Mole of CaC₂ =?
Mole = mass /Molar mass
Mole of CaC₂ = 250 / 64
Mole of CaC₂ = 3.91 moles
Next, the balanced equation for the reaction. This is given below:
CaC₂ + 2H₂O —> C₂H₂ + Ca(OH)₂
From the balanced equation above,
1 mole of CaC₂ reacted to produce 1 mole of C₂H₂.
Next, we shall determine the number of mole of C₂H₂ produced by the reaction of 250 g (i.e 3.91 moles) of CaC₂. This can be obtained as follow:
From the balanced equation above,
1 mole of CaC₂ reacted to produce 1 mole of C₂H₂.
Therefore, 3.91 moles of CaC₂ will also react to produce 3.91 moles of C₂H₂.
Finally, we shall determine the volume of C₂H₂ produced from the reaction. This can be obtained as follow:
Recall:
1 mole of any gas occupy 22.4 L at STP.
1 mole of C₂H₂ occupied 22.4 L at STP.
Therefore, 3.91 moles of C₂H₂ will occupy = 3.91 × 22.4 = 87.58 L
Thus, 87.58 L of C₂H₂ is produced from the reaction.
Commercial scuba divers use tanks filled with a mixture of gases known as Trimix on very long, deep dives. Trimix is composed of 70% nitrogen, 10% oxygen and 20% helium. The total pressure of the Trimix inside a certain tank at the beginning of the dive is 118.4 atm. A. What is the partial pressure of the oxygen in the tank?
Answer:
Partial pressure of O = 11.84 atm
Explanation:
To solve the excersise we think in the partial pressure law with mole fraction.
Mole fraction of gas = Partial pressure of gas / Total pressure
We have data of all the mole fractions:
0.70 N0.10 O0.20 HLet's find out the partial pressure of oxygen in the tank. We replace data in the formula:
0.10 = Partial pressure of gas / 118.4 atm
0.10 . 118.4 atm = Partial pressure of gas → 11.84 atm
If we determine all the partial pressures:
0.70 . 118.4 atm = 82.88 atm → Partial pressure N
0.20 . 118.4 atm = 23.68 atm → Partial pressure He
We can determine the partial pressure of the trimix.
Sum of partial pressures of each gas = Total pressure of the mix
11.84 atm + 82.88 atm + 23.68 atm = 118.4 atm
(A way to see, if our operations were ok)
The partial pressure of oxygen in the tank is required.
The partial pressure of the oxygen in the tank is 11.84 atm.
[tex]x_o[/tex] = The mole fraction of oxygen = 10%
[tex]p[/tex] = The total partial pressure in the tank = 118.4 atm
The mole fraction of a gas is equal to the ratio of partial pressure of the gas to the total partial pressure.
[tex]x_o=\dfrac{p_o}{p}\\\Rightarrow p_o=x_op\\\Rightarrow p_o=0.1\times 118.4\\\Rightarrow p_o=11.84\ \text{atm}[/tex]
The partial pressure of the oxygen in the tank is 11.84 atm.
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50 POINTS..!!! NEED RHE ANSWER ASAP..!!! consider the original wave at the top of the illustration. compare the original wave to the other four. which wave represents a wave with the same volume but a lower pitch?
a). wave a
b). wave b
c). wave c
d). wave d
Answer:
my best guess is b
Explanation:
typically the lower the pitch the longer the wave line inbetween the inclines are
The reaction energy type that has a negative value at the end of the reaction is called: a Barothermic b Exothermic c Endothermic d Isothermic
Answer:
b) Exothermic
Explanation:
Exothermic reaction:
The type of reactions in which energy is released are called exothermic reactions.
In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.
For example:
Chemical equation:
C + O₂ → CO₂
ΔH = -393 Kj/mol
it can be written as,
C + O₂ → CO₂ + 393 Kj/mol
How many grams are there in a 14.5 moles lithium permanganate
There are 1825.6 g in a 14.5 moles Lithium permanganate
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass :
[tex]\tt mol=\dfrac{mass}{MW}[/tex]
moles of Lithium permanganate = 14.5
Lithium permanganate (LiMnO4) MW=125.9 g/mol, so mass :
[tex]\tt mass=mol\times MW\\\\mass=14.5\times 125.9~g/mol\\\\mass=1825.6~g[/tex]
3. True or False: White light is a mixture of all colors of the visible
spectrum.
O True
False
it's true ....
plz mark my answer as brainlist plzzzz vote me also
please help me i willgive brain list
Answer:
the molecular formulas of:Butane is C4H10butene is C4H8Butyne is C4H6.Hexane is C6H14Hexene is C6H12Hexyne is C6H10hope it helps........