Answer:
Petrified wood contains minerals that are only found in fossils.
Explanation:
learned it in school (promise)
what is the gulf stream.
a surface current
a deep current
a river
a climate event
Menthol is a crystalline substance with a peppermint taste and odor. When 0.533 g of menthol is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 2.84 ∘C. Look up the freezing point and f constant for cyclohexane in the Colligative Constants table. Calculate the molar mass of menthol.
Answer: The molar mass of menthol is 156.15 g/mol
Explanation:
Depression in freezing point is given by:
[tex]\Delta T_f=K_f\times m[/tex]
[tex]\Delta T_f=T_f^0-T_f=2.84^0C[/tex] = Depression in freezing point
[tex]K_f[/tex] = freezing point constant = [tex]20.8^0C/m[/tex]
m= molality
[tex]\Delta T_f=K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}[/tex]
Weight of solvent (cyclohexane)= 25.0 g = 0.025 kg
Molar mass of solute (menthol) = ?
Mass of solute (menthol) = 0.533 g
[tex]2.84^0C=20.8\times \frac{0.533}{xg/mol\times 0.025}[/tex]
[tex]x=156.15g/mol[/tex]
The molar mass of menthol is 156.15 g/mol
explain the 3 ways the elements were formed and which elements were formed in each method. (Big Bang, Stellar, And Supernova Nucleosynthesis)
Answer:
See explanation
Explanation:
Big Bang: During the big bang, elements were formed by the squeezing together of light nuclei. Hydrogen atoms were fused together to make helium, lithium and other light weight elements.
Stellar Nucleosynthesis: Stellar nucleosynthesis is the process by which elements are created within stars by combining the protons and neutrons together from the nuclei of lighter elements(Thoughtco). In the stars, hydrogen may be fused to give helium, lithium and other elements lighter than iron.
Supernova Nucleosynthesis: A supernova is a process in which a star releases a large amount of energy together with neutrons, hence elements that are heavier than iron, like uranium and gold, can be produced in the process.
I NEED THE ANSWER IMMEDIATELY TONIGHT, PLEASE!!!
Arrange the following elements in order of decreasing metallic character.
Ra, Sb, In, Cl, Ba, As
Answer:
Ra,Ba,In,Sb,As,P hope this helps you out good luck
The periodic table shows that a carbon atom has six protons. This means
that a carbon atom also has
*
O Six electrons
An atomic mass that equals six
O Six neutrons
O
More protons than electrons
Answer:
A carbon atom has six protons. This means that a carbon atom also has
a) Six electrons
b) Six neutrons
Explanation:
33) Which is the correct name for the molecule depicted below?
A. 2-isopropyl-2,3,4-trimethylbutane
B. 2-isopropyl-2,3-dimethylpentane
C. 2,3,3,4-tetramethylhexane
D. 1,1,2,2,3-pentamethylpentane
E. None of these choices is correct.
Answer:
C. 2,3,3,4-tetramethylhexane
Explanation:
One mole of a metallic oxide reacts with one mole of hydrogen to produce two moles of the pure metal
and one mole of water. 5.00 g of the metallic oxide produces 2.32 g of the metal. What is the metallic
oxide? (Use molar masses)
Answer:
The metallic oxide is Li₂O
Explanation:
Let the metallic oxide be M₂O
Thus;
M₂O + H₂ = 2M + H₂O
Molar mass of M₂O = (2x + 16)
We assumed Molar mass of M to be x.
We are told that 5.00 g of the metallic oxide produces 2.32 g of the metal.
By proportion, we can write the following;
5g of M₂O × (1 mole of M₂O/(2x + 16)) × (2 moles of M/1 mole of M₂O) = 2.32 g of M × 1 mole of M/x g of M
This cancels out to give us;
10/(2x + 16) = 2.32/x
Cross multiply to get;
10x = 2.32(2x + 16)
10x = 4.64x + 37.12
10x - 4.64x = 37.12
5.36x = 37.12
x = 37.12/5.36
x = 6.925 g/mol
The metal with a molar mass closest to this value of x is Lithium which has a molar mass of 6.94 g/mol
Thus the metal is Lithium and as such the metallic oxide is Li₂O
You are planning an experiment that requires 0.0900 mol of nitrogen monoxide gas (NO). What volume would you need at STP? Answer in units of L.
Answer: The volume needed at STP is 2.016 L
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given volume}}{\text {Molar volume}}[/tex]
[tex]0.0900mol=\frac{x}{22.4L/mol}[/tex]
[tex]x=0.0900mol\times 22.4L/mol=2.016L[/tex]
Thus the volume needed at STP is 2.016 L
Which of the following involves a reaction in which energy is absorbed?
O A. An instant cold pack
O B. A car's engine
C. A chemical hand-warmer
O D. A campfire
Liquid A and liquid B form a solution that behaves ideally according to Raoult's law. The vapor pressures of the pure substances A and B are 218 torr and 135 torr, respectively. Determine the vapor pressure over the solution if 1.28 moles of liquid A is added to 5.30 moles of liquid B. 1. 42.4 torr 2. 151 torr 3. 188 torr 4. 202 torr 5. 760 torr
Answer:
Vapor pressure of solution → 151.1 Torr
Option 2.
Explanation:
Raoult's Law is relationed to colligative property about vapor pressure. A determined solute, can make, the vapor pressure of solution decreases.
ΔP = P° . Xm
where Xm is the mole fraction of solute, P° (vapor pressure of pure solvent)
and ΔP = Vapor pressure of pure solvent - Vapor pressure of solution.
In order to determine the vapor pressure of solution, we need to determine, the vapor pressure of B and A in the solution
B's pressure = P° B . Xm
When we add A to B, A works as the solute and B, as the solvent.
Vapor pressure of pure B is 135 torr. (P° B)
In order to determine, the Xm, we use the moles of A and B
Xm = 5.3 mol of B / (1.28 + 5.3) → 0.806
B's pressure = 135 Torr . 0.806 → 108.81 Torr
If mole fraction of B is 0.806, mole fraction for A (solute) will be (1 - 0.806)
A's pressure = 218 Torr . 0.194 → 42.3 Torr
Vapor pressure of solution is sum of vapor pressures of solute + solvent.
Vapor pressure of solution = 42.3 Torr + 108.81 Torr → 151.1 Torr
the Earth's surface is colder than the air above it, what will happen to the air?
Answer:
If the earth's surface is cold, warm air above it will lose heat energy to the cold surface below and the now cool air will remain close to the surface. If a damp surface is warmer than the air above it, some water will evaporate, and the air above the surface will be heated.
Explanation:
:)
how is the temporary hardness of water removed by boiling method explain in brief
Answer:
Explanation:
This happens when water is boiled. Boiling the water causes the precipitation of solid calcium carbonate or solid magnesium carbonate. This removes the calcium ions or magnesium ions from the water, and so removes the hardness.
An unknown sample is analyzed using paper chromatography using solvent X as mobile phase. One spot is observed after the paper is developed. The same unknown substance is re-analyzed using solvent Y as the mobile phase. This time, three spots are observed after the paper is visualized. Is the unknown sample a pure substance or a mixture? Explain your answer.
Answer:
The substance is a mixture
Explanation:
The question lets us know that when solvent X was used as the mobile phase, we obtained only one spot. This may deceive us into thinking that the substance is pure since a pure substance has only one spot on a chromatogram.
However, the same substance yields three spots with solvent Y. This shows that the unknown sample is a mixture of substances and solvent X was unable to fully separate the mixture.
Convert 0.00353 m to its equivalent in picometers.
Answer:
[tex] 3530000000 \: pm[/tex]
Explanation:
[tex]0.00353 \: m \\ \\ = 3.53 \times {10}^{ - 3} \: m \\ \\ = 3.53 \times {10}^{ - 3} \times {10}^{12} \\ \\ = 3.53 \times {10}^{ - 3 +12} \\ \\ = 3.53 \times {10}^{9} \: pm\\\\= 3530000000 \:pm[/tex]
Apply: Click Reset. Set m to 1.0 kg, L to 2.0 m, g to 9.8 m/s2, and θ to –40 degrees. What is the maximum velocity of this pendulum? Show your work. (Hint: The exact height of the pendulum is now 0.468 m.)
Answer:
[tex]3.029\ \text{m/s}[/tex]
Explanation:
m = Mass of pendulum = 1 kg
L = Length of pendulum = 2 m
g = Acceleration due to gravity = [tex]9.8\ \text{m/s}^2[/tex]
h = Height of the pendulum = 0.468 m
[tex]\theta[/tex] = Angle of deflection = [tex]-40^{\circ}[/tex]
[tex]\cos\theta=\dfrac{L-h}{L}\\\Rightarrow h=L-L\cos\theta\\\Rightarrow h=L(1-\cos\theta)\\\Rightarrow h=2(1-\cos(-40))=0.468\ \text{m}[/tex]
The energy balance of the pendulum is as follows
[tex]mgh=\dfrac{1}{2}mv^2\\\Rightarrow v=\sqrt{2gh}\\\Rightarrow v=\sqrt{2\times 9.8\times 0.468}\\\Rightarrow v=3.029\ \text{m/s}[/tex]
The maximum velocity of this pendulum is [tex]3.029\ \text{m/s}[/tex].
Answer:
Max velocity = 3.03 m/s
Explanation:
Mgh = ½ mv2
(1 kg)(9.8 m/s2)(0.468 m) = ½ (1 kg) v2
2 x 4.5864 = ½ v2 x 2
√V2 = √9.1728
V = 3.03 m/s
I hope this helps!
How many sulfur atoms would be present in 41.8 moles of
sulfur?
a
4.18 x 1025 S atoms
b 2.52 x 1025 S atoms
с
1.44 x 1025 S atoms
d
6.94 X 1029 S atoms
Answer: 2.52*10^25
Explanation:
6.02214076*10^23 in 1 mole
According to Avogadro's number, there are 2.52 x 10²⁵ sulfur atoms present in 41.8 moles of sulfur.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.Mass/molar mass is nothing but number of moles .
Therefore, number of atoms=41.8×6.023×10²³=2.52×10²⁵ sulfur atoms.
Thus, there are 2.52 x 10²⁵ sulfur atoms present in 41.8 moles of sulfur.
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Which of the following is not an example of potential energy? Group of answer choices electrical energy, chemical energy, gravitational energy, elastic energy.
PLS HELP FAST
Answer: The one listed below that's NOT an example of potential energy is mechanical energy. Mechanical energy is categorized as a kinetic energy with light, sound, and thermal/heat energy.
HOPE THIS HELPS
The energy that a body possesses as a result of its position with relation to other bodies, internal tensions, electric charge, and other considerations . Mechanical energy is not an example of potential energy.
What is potential energy ?Potential energy is a form of stored energy that is dependent on the relationship between different system components. When a spring is compressed or stretched, its potential energy increases.
Although a force must be applied to an object in order for it to store potential energy, potential energy is technically stored inside matter.
The potential energy must be released, despite the fact that the energy is held in the object's mass due to gravity or elastic forces.
Thus, Mechanical energy is not an example of potential energy.
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A
regulation
NBA
basketball
has
a
surface
area
of 283 square inches
.
What
is
the
surface
area
of
this
basketball
in Square Centimeters
?
Answer:
1.83 × 10³ cm²
Explanation:
Step 1: Given data
Surface area of a NBA basketball (A): 283 in²
Step 2: Convert "A" from square inches to square centimeters
In order to convert "A" from in² to cm², we need a conversion factor. In this case, we will use the conversion factor 1 in = 2.54 cm. Since "in" is raised to the power of 2, we will have to raise the conversion factor to the power of 2 as well.
283 in² × (2.54cm/1 in)² = 1.83 × 10³ cm²
How many moles are present in 57.4 grams of sulfur dioxide (SO2)?
Answer:
Dióxido de azufre
Densidad 26 288 kg/m³; 0,0026 g/cm³
Masa molar 64,0638 g/mol
Punto de fusión 198 K (−75 °C)
Punto de ebullición 263 K (−10 °C)
If an object gets smaller due to a change in state, what happens to its volume? How will this affect its density?
Answer:
the volume of a object will go down but the density stays the same
All of the following can reduce the risk of heart attacks except which one?
A. Regular exercise
B. Sleep deprivation
C. Low dose apirin
D. Diabetes control
Trucks, airplanes, and trains are used to ____________ people and supplies from one place to another. *
Answer:
Trucks, airplanes, and trains are used to transport people and supplies from one place to another.
Explanation:
In which state of matter are the particles at rest (not moving at all)?
none of these
solid
liquid
gas
Answer:
Solids for sure
particles of solid cant flow.
Answer:
B)Solids
Solids have tightly packed particles unlike liquids and gases whose particles can move freely but rate of movement is highest in gas while compared to water
You buy butter $3.31 a pound one portion of onion compote requires 1.7 oz of butter how much does the butter for one portion cost round to the nearest cent
Answer:
The butter for one portion cost is $0.35.
Explanation:
How many moles of CO2 are there in 2.55 x 10
18
molecules of CO2?
Answer: There are [tex]4.23\times 10^{-6}moles[/tex] of [tex]CO_2[/tex]
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given molecules}}{\text {Avogadros number}}[/tex]
[tex]\text{Number of moles}=\frac{2.55\times 10^{18}}{6.023\times 10^{23}}=0.423\times 10^{-5}moles[/tex]
Thus there are [tex]4.23\times 10^{-6}moles[/tex] of [tex]CO_2[/tex]
Do air particles exert a force when they collide with objects
yes or no
Answer:
yes
Explanation:
Gas pressure is caused by the force exerted by gas molecules colliding with the surfaces of objects (Figure 5.2. 1). ... In fact, normal air pressure is strong enough to crush a metal container when not balanced by equal pressure from inside the container.
Answer: Yes Gas pressure is caused by the force exerted by gas molecules colliding with the surfaces of objects (Figure 5.2. ... In fact, normal air pressure is strong enough to crush a metal container when not balanced by equal pressure from inside the container
Explanation:
Which of the following methods would best model how the mountains formed?
potential energy
potential energy
kinetic energy
kinetic energy
electrical energy
electrical energy
chemical energy
Answer:
Potential energy. Kinetic energy can be stored. ... If we drop the object from the shelf or release the spring, that potential energy is converted back into kinetic energy. Kinetic energy can also be transferred from one body to another in a collision, which can be elastic or inelastic.
the pressure of 1 mol of gas is decreased to 0.05 atm 273.k. what happens to the molar volume of the gas under these conditions?
The molar volume of the gas : V = 447.993 L
Further explanationGiven
n = 1 mol
P = 0.05 atm
T = 273 K
Required
The molar volume
Solution
Ideal gas law :
PV=nRT
V = nRT/P
Input the value :
V = 1 x 0.08205 x 273 / 0.05
V = 447.993 L
ANSWER ASAP
If the hydrogen atom emits red, blue-green, blue, and violet light, how many energy levels does it have in the visible region of the spectrum?
A. 3
B. 4
C. 5
D. 6
Answers:
Option B. 4.
Explanation:
The visible spectrum of light emitted by a sample of active or excited hydrogen atoms splits into four wavelengths that are basically four distinct levels of energy in the visible region of the spectrum. There four different wavelengths are 410 nm, 434 nm, 486 nm, and 656 nm. These show for colors according to the spectrum and wavelength violet, blue, green, and red, where 656 nm wavelength is most intense on the spectrum.
The hydrogen atom has four energy levels in the visible region of the spectrum. Therefore, option (B) is correct.
What is the electromagnetic spectrum?The electromagnetic spectrum can be defined as the range of frequencies of electromagnetic radiation and their respective photon energies and wavelengths.
The electromagnetic spectrum has electromagnetic waves with frequencies ranging from one Hz to above 1025 Hz, corresponding to wavelengths. This frequency range is divided into separate bands: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
Each band has different characteristics, such as interacting with matter, and its practical applications. When a hydrogen atom emits a different color represents the energy of a different energy level in the visible region of the spectrum.
Therefore, the four colors red, blue-green, blue, and violet light emitted by a hydrogen atom, are of four energy levels in the visible region of the electromagnetic spectrum.
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You buy rice at 0.71 a pound one batch of fried rice requires 9 pounds of rice how much does the rice for one batch cost round to the nearest cent