Which unit of pressure is derived from the early barometers used to measure pressure?
Answers
Answer:
atmospheres (atm) or bars
Explanation:
You did not give options but barometers measure pressure in atmospheres (atm) or bars.
Between atm or bars, pick one that is in your choices.
Answer:
mmHg
Explanation:
Early barometers used mercury (Hg) to measure pressure based on how high or low it went against the ruler (mm).
Related Questions
What do an engine using gasoline to power a car and
mixing glue and laundry powder to create putty have in commen
Answers
An engine using gasoline to power a car and mixing glue and laundry powder to create putty are both examples of chemical reactions.
Gasoline is considered an energy source due to its ability to release stored chemical energy in the form of heat and mechanical work when it is burned in an engine. When gasoline is ignited in an engine, the chemical energy stored in its molecular bonds is released, causing a rapid combustion reaction that generates heat and expanding gases that push the pistons and create mechanical work.
The energy content of gasoline is typically measured in units of joules or British thermal units (BTUs), which are used to quantify the amount of energy released during combustion. Gasoline is a widely used and important energy source, but its combustion also produces harmful emissions that contribute to air pollution and climate change.
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when calcium carbonate is heated two new substances calcium oxide and carbon dioxide are formed................write a word equation for the above chemical reaction
Answers
Answer:
CaCO3------->CaO + CO2
Heat
Help me with this pls I will mark you as brain
Answers
Answer:
Substance A is deadlier than Substance B,
Explanation:
Simple :)
8. When 50.0 g of MgCO3 react completely with H3PO4, as shown below, 15.8 g of CO₂ is produced.
Determine the theoretical and percent yield for this reaction?
2 H3PO4 + 3 MgCO3 → Mg3(PO4)2 + 3 CO2 + 3 H₂O
Answers
The theoretical yield for this reaction is 78.61 g of CO2 and the percent yield is 20.0%, when 50.0 g of MgCO3 react completely with H3PO4.
What is theoretical yield?The theoretical yield is the maximum amount of product that can be produced from a chemical reaction, calculated using the stoichiometry of the reaction equation. It is based on the assumption that the reaction proceeds perfectly, without any loss or waste of reactants, and without any interference from side reactions.
The theoretical yield is calculated by determining the number of moles of each reactant, using the balanced chemical equation to calculate the number of moles of product that can be produced, and then converting this to the corresponding mass of product. It is a useful reference for determining the efficiency of a reaction and for evaluating the quality of the results obtained in a laboratory experiment.
Calculation of Theoretical yield
To calculate the theoretical yield, determine the number of moles of MgCO3 and use the balanced chemical equation to calculate the number of moles of CO2 produced.
The number of moles of MgCO3 is given by:
n(MgCO3) = m(MgCO3) / M(MgCO3)
n(MgCO3) = 50.0 g / 84.31 g/mol
n(MgCO3) = 0.595 mol
Using the balanced chemical equation, calculate the number of moles of CO2 produced:
n(CO2) = 3 * n(MgCO3)
n(CO2) = 3 * 0.595 mol
n(CO2) = 1.785 mol
The mass of CO2 produced can then be calculated:
m(CO2) = n(CO2) * M(CO2)
m(CO2) = 1.785 mol * 44.01 g/mol
m(CO2) = 78.61 g
This is the theoretical yield for the reaction.
The percent yield is a measure of the efficiency of the reaction, and is calculated as the ratio of the actual yield to the theoretical yield, multiplied by 100:
% yield = (actual yield / theoretical yield) * 100
% yield = (15.8 g / 78.61 g) * 100
% yield = 20.0%
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Jacque is hiking in the mountains and sees a very large and colorful rock layer. It looks different than the surrounding rock layers. What is the best way for Jacque to investigate what the environment was like when this rock layer was deposited? Jacque could measure the height of the rock layer. Jacque could check if the rock layer has fossils in it. Jacque could look at the color of the surrounding rock layers. Jacque could chip off a chunk of rock from the rock layer and smell it.
Answers
Answer:
b:
Jacque could check if the rock layer has fossils in it.
Explanation:
!!!!!! that's what 4 of my teachers said
Flour is a white solid that burns and does not dissolve in water. Sugar is a white solid that dissolves in water and will turn brown and give off a sweet odor when heated. A student finds an unlabeled container in the kitchen that is either flour or sugar. Describe a procedure that they could follow to identify the substance and explain how the student could use the properties of the substance to identify it. (Science)
Answers
Answer:
See explanation
Explanation:
A simple test that will distinguish flour from sugar is to dissolve the unknown substance in water.
Sugar dissolves in water due to the presence of polar groups in the chemical structure of sugar that are capable of interaction with water.
Flour does not dissolve in water. It rather becomes suspended in water when agitated and settles at the bottom of the container when the suspension is left to stand.
What would happen if a small amount of base were added to a buffered solution?
OA. The pH would remain about the same.
OB. The pH would remain neutral.
OC. The pH would decrease.
OD. The pH would increase.
Answers
For these ions, write the correct symbol and charge
1.) rhenium (IV) ion
2.). iridium (IX) ion
3.)platinum (II) ion
4.)technetium (VII) ion
Answers
Rhenium (IV) ion is represented as Re4+.Iridium (IX) ion is not possible as the maximum possible element state for iridium is +VIII.Platinum (II) ion is represented as Pt2+. Technetium (VII) ion is represented as Tc7+.
Where is an ion's charge located?The net charge is expressed in superscript directly just after chemical structure of the molecule/atom in the chemical equation for just an ion. The doubly charge cation is denoted as 2+ rather than +2 because the size of the net charge was written before the sign.
How is a +2 ion created?A metal ion occurs whenever a metal gives up the outermost electrons to obtain a full octet. Calcium (Ca) will become a cation when it loses two electrons from of the outermost energy shell. There will be a +2 charge on it because it lost 2 electrons. With more protons than electrons, it has a positive charge (+2).
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What is the formula unit for the ionic bond between Sodium (Na) and Phosphorus (P)?
Na P
Answers
The ionic bond between Na and P has formula unit Na3P.
What is the formula unit?
Formula units is the chemical formula which gives all the ions present in the lowest ratio possible to make it neutral charge of an ionic compound. For example, the formula unit for sodium chloride can be written as NaCl where charge on Na is +1 and charge on Cl is -1. So to make it neutral they can be cancelled and written as NaCl.
In sodium phosphide, the charge on Na (sodium) ion is +1 and the charge on the P (phosphorous) ion is -3. Therefore, make the charges neutral, 3 Na ions need to be added to 1 P ion. Formula units can be used to describe or represent the molecules or the elements which make up a substance.
Hence, Na3P is the formula unit of Na and P in sodium phosphide.
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If the statement is true, select True. If it is false, select False.
In a polar bond, one atom pulls on the shared electrons more than the other atom.
True
False
Answers
Answer:
xiyducjfuxudjfjfjjffjfhhfudjdjdjdudud
Answer:
I dont knew this question what level this question. are asking for a friend
A student places a small amount of water in a glass dish and then carefully places a small paperclip on the surface of the water. The paperclip floats. What happens if the student adds a drop or two of dish soap to the water?
Answers
Answer:
Adding soap would cause the paper clip to fall through the water and onto the base of the dish because soap is a surfactant.
Explanation:
The concept surface tension is used here to determine what happens to the paperclip when a drop of dish soap is added to the water. Here the paperclip sink into the water.
What is surface tension?The property exhibited by the surface of a liquid in order to resist the action of an external force because of the cohesive nature of the molecules is known as the surface tension. Due to this property the surface of a liquid behaves as an extended elastic membrane.
The paperclip float on water because of the high surface tension as the water molecules at the surface are strongly attracted among themselves. But on adding one or two drops of dish soap to water causes the paperclip to sink.
The addition of the drops of dish soap to the water weakens the attraction among the water molecules and thereby lowers the surface tension. As a result of this the surface film disappears and the paperclip sink into the water.
Thus the paperclip fall into the water when a drop of dish soap is added to the water.
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Benedict College E360 xG The number of second o x The cis isomer of the 1.3-diethyl cyclobutane is: CHyCH2 CH CH CH CHy CH CHs OA ?? oc Which is more stable,cis-1-ethyl-3-methylcyclohexane or trons-1-ethyl-3-methylcyclohexane? O cis trans The number of second degree (2") hydrogens in the structure below is ViewSonic
Answers
A cyclic diallylamine called 1-ethyl-3-methylcyclohexane is a feedstock used to create methicillin-resistant Staphylococcus aureus (MRSA).
Describe trons-1-ethyl-3-methylcyclohexane or methylcyclohexane.An organic substance with the chemical formula CH3C6H11 is methylcyclohexane. It is a white liquid with a little odor that is categorized as a saturated hydrocarbon.As a solvent, methylcyclohexane is employed. Toluene is the principal product of its conversion in naphtha reformers. [4] Some correction fluids (like White-Out) also use methylcyclohexane as a solvent.Because one methyl group is attached to one carbon of the cyclohexane ring, methylcyclohexane is a monosubstituted cyclohexane.This monosubstituted methylcyclohexane has the lowest energy form when the methyl group is located equatorially as opposed to axially.The idea of A value embodies this equilibrium. Because there are axial hydrogen atoms on the same side of the ring while the methyl group is in the axial position, there is steric crowding (steric strain) experienced by the methyl group (known as the 1,3-diaxial interactions).To know more about methylcyclohexane visit:
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Question 2 of 35
what is one way the industrial revolution changed how people worked?
cause
effect
a.
led to
the cotton gin made it
possible to produce cotton
more quickly
cotton farms became more
profitable
cause
effect
b.
led to
the cotton gin replaced
human workers in the cotton
fields.
the price of cotton went up.
cause
effect
c
c.
led to
the cotton gin made it faster
to ship cotton to the west,
the country became more
connected
cause
effect
d
led to
the cotton gin resulted in
more people being able to
start cotton farms
the price of cotton went
down
Answers
The correct answer is option B.
The cotton gin, invented by Eli Whitney in the late 18th century, revolutionized the cotton industry by mechanizing the process of separating cotton fibers from the seeds. Prior to the cotton gin, this process was predominantly done manually by laborers, which was time-consuming and labor-intensive.
With the introduction of the cotton gin, the mechanized process became significantly faster and more efficient. It allowed cotton to be processed at a much higher rate, resulting in increased production. As a consequence, the demand for cotton increased, both domestically and internationally.
To meet the rising demand, plantation owners and cotton farmers increasingly relied on the cotton gin to process larger quantities of cotton. This led to the replacement of human workers in the cotton fields with cotton gin machines, as the machines could process cotton more quickly and with fewer laborers required.
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How small are the micro organism in and around the horon micro biome.
Use 4 of the following vocablular words in your.
response
Cells, micrometer, microorganisms, molecules, microscope,
nanometer
Answers
The microorganisms in and around a microbiome are generally about 1 micrometer in size.
The microbiome is the group of microorganisms that coexists typically in any given habitat. In general, microscopic creatures are referred to as microbes. The micrometer is the measurement unit most frequently used to describe items with minuscule lengths. One-millionth of a meter is referred to as a micrometer.
The study of organisms that require a microscope to see is known as microbiology. They are around one-tenth the size of an average human cell. The size of viruses is roughly one-tenth that of other microorganisms, such as bacteria.
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How do the alveoli in the lungs move oxygen and nutrients into the bloodstream? 1.Gravity 4.Time 2.Diffusion 5.Pressure 3.Magnetic force
Answers
Answer:
2.Diffusion
Explanation:
As we metabolize certain nutrients for the correct functioning of our cells, carbon dioxide is produced as a result. We need oxygen in order to metabolize them, so we need to have a system to incorporate it, and to eliminate the carbon dioxide produced.
This system is provided by the interaction between the respiratory system, which allows the enter of oxygen into the body and gets rid of the carbon dioxide, and the circulatory system, which acts transporting carbon dioxide and oxygen to and from the lungs, respectively.
The surface available for the gaseous exchange is enlarged by the pulmonary alveoli. The alveoli are the terminal aerial spaces of the respiratory system and the structures where the exchange between the air and blood is produced. Each alveolus is surrounded by a net of capillaries, where oxygen is freed from the hemoglobin and moves into the cells by diffusion. Carbon dioxide, diffuses out of the cells into the capillaries, where most of it dissolves in the plasma of the blood.
Determine the phase or phases in a system consisting of H2 O at the following conditions and sketch the p−v and T−v diagrams showing the location of each state. a) p=100lbf/in^2,T=327.86∘F b) p=140lbf/in2^,T=327.86∘F c) T=100∘C,p=0.4 bar d) T=20∘C,p=50bar e) p=14.7lbf/in^2,T=20∘F
Answers
The phases in the system under different conditions are: a) superheated vapor, b) compressed liquid, c) mixture of liquid and vapor, d) compressed liquid, and e) mixture of solid and vapor.
The question asks us to determine the phase or phases in a system consisting of H2O at different conditions and sketch the p-v and T-v diagrams. Let's go through each condition:
a) At p=100 lbf/in^2 and T=327.86∘F, we can refer to the steam tables to find the corresponding saturation pressure and temperature. We find that the saturation pressure at this temperature is approximately 83.3 lbf/in^2, which is less than the given pressure. Hence, the phase will be superheated vapor.
b) At p=140 lbf/in^2 and T=327.86∘F, the saturation pressure is still 83.3 lbf/in^2, but the given pressure is higher. Therefore, the phase will be compressed liquid.
c) At T=100∘C and p=0.4 bar, we convert the pressure to lbf/in^2, which is approximately 5.8 lbf/in^2. Comparing this with the saturation pressure at this temperature, which is around 14.7 lbf/in^2, the given pressure is lower. Thus, the phase will be a mixture of liquid and vapor.
d) At T=20∘C and p=50 bar, we convert the pressure to lbf/in^2, which is approximately 725.2 lbf/in^2. The saturation pressure at this temperature is much lower, around 0.034 lbf/in^2. Therefore, the phase will be compressed liquid.
e) At p=14.7 lbf/in^2 and T=20∘F, we can refer to the steam tables to find the corresponding saturation pressure and temperature. The saturation pressure at this temperature is approximately 0.06 lbf/in^2, which is higher than the given pressure. Hence, the phase will be a mixture of solid and vapor.
In conclusion, the phases in the system under different conditions are: a) superheated vapor, b) compressed liquid, c) mixture of liquid and vapor, d) compressed liquid, and e) mixture of solid and vapor.
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Calculate the quantitative concentration of HCl in the solution if in the reaction of 500 cm3 the solution with AgNO3 produces 0.7 g of AgCl AgNO3 + HCl -------> AgCl + HNO3
Answers
Answer:
9.77x10⁻³M HCl
Explanation:
Assuming the solution of AgNO₃ is in excess:
Based on the chemical equation:
AgNO₃ + HCl → AgCl + HNO₃
We must find the moles of AgCl that will be produced. With the moles and knowing 1 mole of AgCl is produced from 1 mole of HCl we can find the moles of HCl and its concentration as follows:
Moles AgCl -Molar mass: 143.32g/mol-:
0.7g AgCl * (1mol / 143.32g) = 4.88x10⁻³moles AgCl = Moles HCl
As the volume of the solution is 500cm³ = 0.500L, the concentration of HCl is:
4.88x10⁻³moles HCl / 0.500L =
9.77x10⁻³M HClWhat is C in bohr’s equation?
Answers
Formula
\(\ell=\frac{n h}{2 \pi}\)
\(\ell = angular \: momentum\)
\(n = principal quantum number \\ h = Planck's constant \\ \pi = pi\)
A compound composed of carbon and hydrogen with the formula CxHy was burned in a combustion reaction. The balanced equation is shown below.
2CxHy + 15O2 (g) → 12CO2 (g) + 6H2O (l)
Using only the information found within the chemical equation, determine what number x equals and what number y equals and write the correct formula for the compound
x=6 , y=6
x=3 , y=3
x=6 , y=12
x=12 , y=6
Answers
The values that we need are;
x = 6 y = 12
What is the combustion equation of a hydrocarbon?The combustion equation of a hydrocarbon involves the reaction of the hydrocarbon with oxygen to produce carbon dioxide and water. The general form of the equation is:
hydrocarbon + oxygen -> carbon dioxide + water
The number of oxygen molecules needed to balance the equation is determined by the stoichiometry of the reaction, which requires that the number of carbon atoms and hydrogen atoms in the reactants must equal the number of carbon atoms and hydrogen atoms in the products.
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Which molecule has five atoms per molecule?
a.
H2O
b.
NH3
c.
CH4
d.
O2
Answers
Answer:
CH4, methane
Explanation:
CH4 has 1 C (carbon) and 4 H (hydrogen) atoms, for a total of 5 atoms in one molecule.
Lexi is balancing equations. She is finding one equation to be very difficult to balance. Which explains how to balance the equation ZnSO4 + Li2CO3 → ZnCO3 + Li2SO4?
One reactant and one product needs the coefficient 2.
The products both need a 3 coefficient.
The reactants both need a 2 coefficient.
Atoms in the equation are already in balance.
Answers
Answer: Atoms in the equation are already balanced.
Explanation:
ZnSO₄ + Li₂CO₃ ⇒ ZnCO₃ + Li₂SO₄
This appears to be a double displacement reaction.
Zn is paired with CO₃ on the right side, and Li is paired with SO₄ on the right side.
To balance this equation, we need to look at the number of each atom on both the left and right sides of the equation.
ZnSO₄ + Li₂CO₃ ⇒ ZnCO₃ + Li₂SO₄
Left side
Zn: 1
S: 1
O: 4 + 3 = 7
Li: 2
C: 1
Right side
Zn: 1
S: 1
O: 3 + 4 = 7
Li: 2
C: 1
The equation is balanced because there are the same number of each atom on the left and right sides of the equation.
explain how can you?convert solid fuel to liquid fuel and why.
Answers
The conversion process typically involves heating the solid fuel to its boiling point, then separating the vapor and condensing it into a liquid.
Converting solid fuel to liquid fuel is a process known as liquefaction, and it is done to improve the storage, transport, and combustion of the fuel.
The conversion process typically involves heating the solid fuel to its boiling point, then separating the vapor and condensing it into a liquid. The liquid fuel can be further processed to remove impurities and improve its properties, such as viscosity, flash point, and energy content.
One of the primary reasons for converting solid fuel to liquid fuel is to improve its storage and transport properties. Liquid fuels are easier to store and transport than solid fuels, as they can be stored in tanks or pipelines and transported by tanker trucks or ships. This makes it easier to distribute the fuel to where it is needed.
Another reason for converting solid fuel to liquid fuel is to improve its combustion properties. Liquid fuels are more energy-dense than solid fuels and can be burned more efficiently, providing more energy per unit of fuel. This can lead to lower emissions, improved fuel economy, and reduced costs.
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I am having the worst day ever, Someone please cheer me up. :( I'll mark you as brainiest. :(
Answers
Once I told a chemistry joke
I got no reaction.
What do you do with a sick chemistry teacher?
If you can't helium, and can't curium, you might as well barium.
I don't trust atoms,
I heard they make up everything
Hope I helped make ur day. :)
What would cause the equilibrium to shift left in this reaction?
CO + 3H2 ⇌ CH4 + H2O
A) adding heat to the product mixture
B) a faster rate of forward reaction
C) increased collisions between CO and H2
D) the escape of water from the mixture
E) placing the mixture in a cold water bath
Answers
Explanation:
Answer: Option A. Explanation: To decrease pressure by increasing volume, the equilibrium of the reaction shift to the left as the reactant side has greater number of moles than the product side
11. A student is studying guppies, a type of fish. The student learns
that common guppies normally live in water with temperatures from
22°C to 30°C. The student counts the number of movements in 1
minute at several different temperatures. According to the student's
graph, about how many movements on average would the guppies
most likely make at 30°C?
Answers
If I leave 750mL of 0.50M sodium chloride solution uncovered on a windowsill at 150mL of the solvent evaporates, what will the new concentration of the sodium chloride solution be?
Answers
Answer:
0.63 M
Explanation:
(this is the opposite of a dilutions problem – the V2 value is smaller than V1, but otherwise the equation is no different.)
12.0 moles of li(s) react with 6.0 moles of h3po4 according to the reaction 6 li(s) + 2 h3po4(aq) -> 2 li3po4(aq) + 3 h2(g) what is the theoretical yield (in moles) of h2 gas? (1pts) question 19 - 12.0 moles of li(s) react with 6.0 moles of h3po4 according to the reaction 6 li(s) + 2 h3po4(aq) -> 2 li3po4(aq) + 3 h2(g) what is the theoretical yield (in moles) of h2 gas?
Answers
The theoretical yield (in moles) of H₂ gas produced from the reaction of 12 moles of Li and 6 moles of H₃PO₄ is 6 moles
Balanced equationThe balanced equation for the reaction is given below:
6Li(s) + 2H₃PO₄(aq) -> 2Li₃PO₄(aq) + 3H₂(g)
From the balanced equation above,
6 moles of Li reacted with 2 moles of H₃PO₄.
Next, we shall the limiting reactant. This can be obtained as follow:
From the balanced equation above,
6 moles of Li reacted with 2 moles of H₃PO₄.
Therefore,
12 moles of Li will react with = (12 × 2) / 6 = 4 moles of H₃PO₄
From the above calculation, only 4 moles of H₃PO₄ reacted completely with 12 moles of Li.
Thus, Li is the limiting reactant.
How do I determine the theoretical yield of H₂?The theoretical yield of H₂ can be obtained as follow:
From the balanced equation above,
6 moles of Li reacted to produced 3 moles of H₂.
Therefore,
12 moles of Li will react to produce = (12 × 3) / 6 = 6 moles of H₂
Conclusion: The theoretical yield of H₂ is 6 moles
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Question 58
Which one of the following metals is most fatal to fish when it becomes dissolved in acid waters?
a. Manganese
b. lead
c. Aluminum
d. zinc
Answers
The answer to question 58 is c. Aluminum. When aluminum dissolves in acid waters, it can be extremely toxic to fish, causing death or other negative effects on their health. Acid waters are bodies of water that have a low pH due to acid rain or other sources of acidity.
These acid waters can dissolve metals and other pollutants, making them even more harmful to aquatic life. It is important to monitor and regulate the pH and pollution levels in bodies of water to ensure the health and survival of fish and other aquatic organisms. The most fatal metal to fish when it becomes dissolved in acid waters is c. Aluminum. In acidic environments, aluminum becomes more soluble and toxic to aquatic life, including fish. Elevated levels of dissolved aluminum can lead to gill damage, reduced growth, and even death in fish populations. Although manganese, lead, and zinc can also be harmful in high concentrations, aluminum poses a greater threat in acid waters due to its increased solubility and toxicity.
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chromium is electroplated industrially by the electrolysis of solutions of k2cr2o7. how much time would be required to deposit 1.00 kg of cr using a current of 200.0 a?
Answers
The time required to deposit 1.00 kg of Cr using a current of 200.0 A is approximately 553 seconds, or 9.22 minutes.
The amount of chromium deposited is directly proportional to the amount of electricity that passes through the electrolytic cell.
The balanced chemical equation for the electrodeposition of chromium from a solution of potassium dichromate is:
Cr2O7^2−(aq) + 14H+(aq) + 6e− → 2Cr3+(aq) + 7H2O(l)
From the above equation, it can be inferred that it takes six moles of deposit electrons to produce two moles of chromium or 6 moles of electrons produce 52 g of Cr.
Therefore, the amount of charge required to deposit 1.00 kg of Cr is:
1.00 kg Cr × (1000 g / 1 kg) × (6 mol e- / 52 g Cr) × (96500 C / mol e-) = 110,577 C
The time required to deposit 110,577 C at a current of 200.0 A is:
t = Q / I = 110,577 C / 200.0 A = 552.89 seconds molecules
Therefore, It takes roughly 553 seconds or 9.22 minutes to deposit 1 kilogram of Cr with a current of 200.0 A.
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6. Which type of force(s) will cause a change in an object's motion? *
A) Balanced Forces
O B) Unbalanced Forces
Answers
Unbalanced forces cause a change in motion, speed, and/or direction. When two forces act in the same direction on an object, the net force is equal to the sum of the two forces.
Answer:
B.Unbalanced .............