Answer:
used by plants to make protein
Explanation:
so B
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
Name each of the following organic molecules. 
You are given a sample of several compounds to separate by paper chromatography. You draw a pencil line exactly 1.00 cm from the bottom of the paper, and place a spot of sample on it. You dry the sample, then develop it in a solvent. When the chromatogram is taken out of the solvent, the paper is wet up to 9.17 cm from the bottom of the sheet. The compound you are interested in shows up as a spot 7.57 cm from the bottom of the paper. Calculate the following:
a. How far did the compound move?
b. In the same time, how far did the solvent move?
c. What is the Rf factor for the compound?
Answer:
a. 6.57 cm
b. 8.17 cm
c. 0.80
Explanation:
a. The compound moved from where it was first placed, to a spot 7.57 cm from the bottom of the paper, in other words:
7.57 cm - 1.00 cm = 6.57 cmb. A similar method is made for the solvent:
9.17 cm - 1.00 cm = 8.17 cmc. The Rf of the factor is equal to the distance that the compound moved divided by the distance the solvent moved:
6.57 cm / 8.17 cm = 0.80explain 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.
If gold is selling presently for $1000.00/oz how much would 1 cubic inch of gold be worth?
Note: 1 inch= 2.54 cm; 1 oz. =28.3 g Density of gold: 19.3 g/cm^3
Answer:
$89.69
Explanation:
$1000 = 1 oz = 28.3g
volume = mass/density
volume = 28.3/19.3 = 1.47cm³
1 inch= 2.54 cm
1 cubic inch = (2.54)³ = 16.39 cm³
16.39/1.47 = 11.15 cubic inch
11.15 cubic inch = $1000
1 cubic inch = 1000/11.15 = $89.69
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
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)
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.
When a substance easily dissolves in a liquid, it has high solubility in that liquid. When a substance does not easily
dissolve in a liquid, it has low solubility in that liquid. Solubility of a gas in water describes how well the liquid can "hang
on" to gas, instead of releasing it into the air. Based on the results of your experiment, do you think that CO2 has a higher
solubility in hot water or cold water? Why?
Answer:
cold water because as temperature increases the less soluble co2 is in it
Explanation:
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
Vitamin C is a covalent compound with the molecular
formula C6H8O6. The recommended daily dietary
allowance of vitamin C for children aged 4-8 years is
0.000142mol. What is the mass of this allowance in grams?
The mass allowance of Vitamin C for children aged 4-8 years is equal to 0.025 grams.
What is a mole?A mole can be defined as a standard unit that can be utilized to evaluate the number of entities such as atoms, molecules, ions, or other particular particles in a particular amount of the substance.
The number of elementary entities present in one mole of any chemical substance was found to be equal to 6.023 × 10²³ which is also known as the Avogadro number.
Given, the number of moles of vitamin C = 0.000142 moles
Given, the molecular formula of Vitamin C is C₆H₈O₆.
The mass of one mole of C₆H₈O₆ = 176 g
One mole of Vitamin C has mass = 176 g
0.000142 mol of Vitamin C has mass = 0.000142×176 = 0.025 g
Therefore, the mass of 0.000142 mol of Vitamin C is 0.025 g.
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C3H8 (g)+ 502 (g) 3CO2 (g) + 4 H2O (g) + 531 kcal
Answer:
Exotérmica.
Explanation:
¡Hola!
En este caso, dado que la mayoría de reacciones de combustión son exotérmicas, al generar calor en los productos, es posible inferir que esta reacción, referida a la combustion de metano es exotérmica debido a lo anteriormente mencionado, ya que el término de energía de reacción, 531 kcal, está al lado de los productos, lo que quiere decir que es energía generada.
¡Saludos!
In NMR: The size of coupling constants (J values) depend on three factors:
a. Through bond distance between the protons.
b. Angle between the two C-H bonds.
c. Electronegative substituents.
1. True
2. False
Answer:
True
It is true that he size of coupling constants (J values) depend on three factors:
a. Through bond distance between the protons.
b. Angle between the two C-H bonds.
c. Electronegative substituents.
Explanation:
With the increase in the valence angle the coupling constant reduces. The distance between the carbon atoms also influence coupling constant. With increase in bond length, the coupling constant decreases. Also the more an atom is electronegative, the lesser is the coupling constant
Thus, it is true that he size of coupling constants (J values) depend on three factors:
a. Through bond distance between the protons.
b. Angle between the two C-H bonds.
c. Electronegative substituents.
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
1. Which of the following is an inherited trait?
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:
:)
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
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
Atoms of which of the following elements are largest?
A:
Na
OOOO
Answer:
yes answer os Na because it's electronic configuration is 1s^2,2s^2,2p^6,3s^1
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.
Ions form as a result of uneven charge distribution between the nucleus and the electron cloud. TRUE OR FALSE
Answer:
true
Explanation:
true
What organelle(s) act(s) as "the boss" inside a cell? A.The alveoli B. The mitochondria C. The nucleus D. The lysosomes
The organelle(s) that act(s) as "the boss" inside a cell is The nucleus.
What is cell in the nucleus?Nucleus is the center most part of the cell that contains all the chromosomes and that contains all the genetic information.
The nucleus is a double-membraned organelle that contains the genetic material and other instructions required for cellular processes. It is exclusively found in eukaryotic cells and is also one of the largest organelles.
The nucleus contains nearly all of the cell's DNA, surrounded by a network of fibrous intermediate filaments and enveloped in a double membrane called the nuclear envelope. The nuclear envelope separates the fluid inside the nucleus, called the nucleoplasm, from the rest of the cell.
Therefore, The organelle(s) that act(s) as "the boss" inside a cell is The nucleus.
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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:
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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please help me! This is due by tomorrow!
Answer:d
Explanation:Since the earth would be closer to the sun the ozone layer would not be able to handle the more powerful ultra violet rays making the earth to hot.
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
Explain how Florida droughts lead to water restriction
Answer:
Due to drought in Florida, people were informed to minimize the use of water and certain rules were made regarding water usage.
Explanation:
A drought is a shortage in the water supply. The drought in Florida led to water restriction as it was a way to prevent the shortage of water in the long run. Florida experienced a drought and water restriction was used as a way to curtail further shortage of water.
New rules were made to prevent wastage of water such as limiting lawn watering to one day in a week, limiting of car washing, and homeowners were not allowed to do things that can lead to an increase in water usage.
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]
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.