Answer:
the moles of mercury are nHg = 65/201
HgO --------> Hg + 1/2O2
65/201 65/201
=> the moles of HgO are 65/201 mol
a supporter of the phlogiston theory says that when petrol burns in air phlogiston is lost in the air so the mass decreases. Write a letter to this person explaining why the phlogiston theory is wrong
Phlogiston theory is wrong as it states that when petrol burns in air phlogiston is lost in air so the mass decreases but as per law of conservation of mass , mass never increases or decreases rather it is constant.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
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What are the chances of the offspring being heterozygous for tall plant?
There are 50% chances of the offspring being heterozygous for tall plant.
Crossing homozygous short tt plants with heterozygous tall Tt plants yields short to tall plants in a 1:1 ratio. So the seed has a 50% chance of growing into a large plant.
Under such conditions, the dominant allele is always expressed and the recessive allele is masked. In this example, the size allele is dominant, so the plant grows.
About 80% of an individual's height is determined by differences in their inherited DNA sequences.
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In lab, a dialysis bag was filled with a 10% sucrose solution and placed in an unlabeled beaker filled with clear liquid. The dialysis bag was made of a semipermeable membrane that allowed the free passage of water, but was not permeable to sucrose. After two hours, the bag in the beaker decreased in size, lost volume, and became flaccid. Therefore, at the beginning of the experiment, the solution in the bag was ____________ compared to the solution in the beaker. g
Answer:
Of lower concentration or less concentrated
Explanation:
Osmosis is the movement of solvent from a region of lower concentration of solute to a region of higher concentration of solute through a semipermeable membrane in order to equalize the concentration of the solutions on both sides.
Since the membrane of the bag is semipermeable, then the fact that the bag in the beaker decreased in size, lost volume, and became flaccid indicates that the solution in the bag is of lower solute concentration than the solution in the beaker hence the movement of water molecules into the beaker by osmosis.
In biology, a system is a collection of (blank)
(each made of multicellular tissues) that together perform a major function.
In biology, a system is a collection of organs (each made of multicellular tissues) that together perform a major function.
What is the organ about?In biology, a system refers to a collection of organs that work together to perform a specific function or set of functions. Organs are structures made of multiple types of tissues that work together to perform a specific task.
These tasks can be related to maintaining homeostasis, such as the circulatory system which transports oxygen and nutrients throughout the body, or to a specific function, such as the reproductive system which is responsible for the production of offspring.
Therefore, Organs within a system are highly specialized and have specific functions, but they also work together in concert to achieve the overall function of the system. For example, the digestive system is made up of several organs including the mouth, esophagus, stomach, small intestine, and large intestine.
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Describe the difference between an endothermic reaction and an exothermic reaction.
Answer:
In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.
Part A
Determine the value of Kp for the following reaction:
4HCl(g)+O2(g)⇌2Cl2(g)+2H2O(g)
Express the equilibrium constant to three significant digits.
To determine the value of Kp for a reaction, we need to know the concentrations of all the reactants and products at equilibrium.
In this case, we are not given the equilibrium concentrations, so we cannot directly calculate Kp. Instead, we can use the ideal gas law to relate the equilibrium concentrations to the partial pressures of the gases, and use those partial pressures to calculate Kp.The equation for the ideal gas law is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. If we assume that the reaction occurs at a constant volume and a constant temperature, we can use the ideal gas law to relate the equilibrium partial pressures of the gases to the concentrations of the gases.Given that we have no information about the equilibrium concentrations or partial pressures, we can not calculate Kp.
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A 6.25 g sample of magnetite (Fe 3O 4) contains 4.52 g of Fe. What are the percentages of iron and oxygen in magnetite
We used the formula percentage of iron magnetite=(Mass of Fe/Mass of Fe3O4)100%. We then calculated the percentages of iron magnetite (68%) and oxygen magnetite (32%).
Magnetite is a mineral and one of the most important iron ores, with the chemical formula Fe2+Fe3+2O4. It is a ferrimagnetic iron oxide that is attracted to a magnet and can be magnetized to become a permanent magnet. With the exception of extremely rare native iron deposits, it is the most magnetic of all naturally occurring minerals on Earth. Naturally magnetized pieces of magnetite, known as lodestone, will attract small pieces of iron, which is how ancient peoples discovered magnetism.
Magnetite is black or brownish-black with a metallic luster, has a Mohs hardness of 5-6, and leaves a black streak. Magnetite grains are very common in igneous and metamorphic rocks.
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If a sample of pure hydrogen gas is ignited very carefully, the hydrogen burns gently, combining with the oxygen gas of the air to form water vapor. Write the unbalanced chemical equation for this reaction.
H₂ (g) + O₂ (g) ⇒ H₂O (g) because Hydrogen and oxygen gas both exist as diatomic molecules. The water is in gaseous state due to the heat given off by the combustion reaction.
What is combustion reaction?Combustion, often known as burning, is a high-temperature exothermic redox chemical reaction that occurs between a fuel and an oxidant, typically atmospheric oxygen, to generate oxidized, generally gaseous products in a mixture known as smoke. A combustion reaction is a type of chemical reaction that occurs when any combustible component reacts with an oxidiser to generate an oxidised product. Fires and the release of energy in the form of heat are frequently associated with combustion processes. A hydrocarbon generally combines with oxygen in most combustion processes to produce carbon dioxide and water.
Here,
Because hydrogen and oxygen gas exist as diatomic molecules, H2 (g) + O2 (g) = H2O (g). Because of the heat produced by the combustion reaction, the water is in a gaseous condition.
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Dalton's Law: John puts 1250 PSI of Oxygen, 780 PSI of Nitrogen and 550 PSI of Helium in a SCUBA tank. What is the total pressure?
According to Dalton law total pressure will be 2580 PSI.
What is Dalton Law?The overall pressure exerted by a mixture of gases is equal to the sum of the partial pressures exerted by each individual gas in the mixture, according to Dalton's partial pressures law. For instance, the total pressure exerted by a mixture of two gases A and B is equal to the sum of gas A and gas B's respective partial pressures.
Total pressure =[tex]P_{1}+P_{2}..........P_{n}........(i)[/tex]
It is given that,[tex]P_{Oxygen}= 1250 PSI, P_{Nitrogen} = 780 PSI, P_{Helium} =550PSI.[/tex]
Now, put the value of given data in above equation.
[tex]P_{Total} = P_{Oxygen}+P_{Nitrogen}+P_{Helium}[/tex]
=1250 PSI +780 PSI + 550PSI=2580 PSI
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suppose scientist have found three oxide materials that could potentially be used as a cathode to a magnesium or sodium anode in a battery for electrons plan an investigation to determine the best battery what characteristics did you test for
The sodium is the anode of the cell while the magnesium is the cathode of the cell.
How would the investigation go?We know that in the cell, we are going to have just about two electrodes in the cell and we would have the cathode and the anode. We have to know that the cathode is the point by which the current would enter the cell and the cathode is the point from which the current would leave the cell.
Having said this, we should know that the investigation would have to take into account the reduction potentials of the magnesium as well as that of the sodium as these can be used in the construction of the cell that is under study here.
Hence, by consideration of the electrode potentials, we can see that the sodium would have to act as the anode of the cell and we would keep up with the magnesium as the cathode of the cell.
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diatomic elements are important. what makes them different from other elemental substances?
Atoms follow the octet rule, which makes them more stable in pairs.
The diatomic elements oxygen and nitrogen have a slightly more complex structure. There is a double bond between the two O atoms in the O₂ dot structure. And there is a triple bond between the two N atoms in the N₂ dot structure. Diatomic elements are elements that are never found alone in nature. It is always bound to another atom. The diatomic state of this atom is much more stable than its unbonded state.
Everything around us contains energy, even if it doesn't move. All molecules and atoms have spins and vibrations, but these are all internal forces.
All atoms try to reach the lowest potential. Atom has a state of lower energy, implying maximum stability under certain external conditions.
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why atoms of chlorine have no overall charge
Answer:
because I told them to do.
Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.
Please hurry and help please don’t send a link
Answer:
A for 1 and 4 B for 2 and 3 ..........
Answer:
1)A 2)B 3)B 4)A
Explanation:
An autotroph is a producer (plant) and a heterotroph is a consumer. Good luck!
The overall charge of an atom or ion is ________ if the number of electrons is ________ than the number of protons.
The overall charge of an atom or ion is negative if the number of electrons is greater than the number of protons.
What is electron?A subatomic particle with a negative charge is called an electron. It is found outside the nucleus of an atom and is one of the main constituents of matter. Electrons are responsible for the chemical properties of atoms and thus play an important role in chemical reactions. Electrons have low mass and move around the nucleus at relativistic speeds. They are also responsible for the electrical and magnetic properties of atoms, and for the transmission of light and other forms of energy. Electrons can also interact with other particles and form complex structures, such as molecules.
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river system smallest to largest
As stated, the Tributary, River, and River system are in order of largest to smallest.
What is the short definition of a river?A river is a part of the ocean that resembles a ribbon and flows downward under the influence of gravity. A river may be both large and deep or it may be only shallow enough to wade over. A stream, watercourse, or brook is a streaming water source that is lower than a river.
What is a river metaphor?The river flows through the landscape like a silver ribbon. The fast flowing river plunders everything in its path. The river is a seal that is attempting to return toward the tidal ways. A grizzly bear is the river, leaping to get its prey.
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The complete question is-
Place the following in order from smallest to largest.
River, River system, Tributary.
Solve these 5 items in your notebook and take a clear and readable photo. PS. You need to balance the equation before u identify the type of chemical reaction.
Answer
bitly coin download
Explanation:
bitly coin download
Calculate the molarity of a solution of HNO3 if 15.72 mL of the solution neutralize 28.2 mL of 0.100 M H2SO4 solution
The molarity of a solution of HNO3 if 15.72 mL of the solution neutralize 28.2 mL of 0.100 M H2SO4 solution is 0.89 x 10^-4M
Given the volume of HNO3(V1) = 15.72mL
The volume of H2SO4 (V2) = 28.2mL
concentration of H2SO4 (M2) = 0.100M
Concentration of HNO3 = M1
We know that c = n/v where n is the number of moles.
The moles of H2SO4 (n2) = V2 X M2/1000
n2 = 28.2 x 0.100 /1000 = 28. 2 x 10^-4
From the reaction: H2SO4 + HNO3 -> NO2+ + HSO4- +H2O
We can see from the equation that the number of moles of HNO3 must be half that number, so: n1 = 28. 2 x 10^-4 /2 = 14.1 x 10^-4
M1 = 14.1 x 10^-4/15.72 = 0.89 x 10^-4M
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Suppose that a chemist combines 231 mL of methane and 907 mL of chlorine at STP in a 2.00 L flask. The flask is then allowed to stand at 298 K. If the reaction reaches 75.9% completion, what is the total pressure in the flask
The total pressure in the flask is 1.320 times the total pressure.
What is pressure?Pressure is an important concept in chemistry, as it affects the physical behavior of gases and solids, and the rates at which reactions occur. Pressure is a measure of the force applied to an area, typically expressed in units of atmospheres (atm), or kilopascals (kPa).
Methane :
Mole fraction of methane = (231 mL / 2.00 L) = 0.1155
Partial pressure of methane = 0.1155 * Ptotal
Chlorine:
Mole fraction of chlorine = (907 mL / 2.00 L) = 0.4535
Partial pressure of chlorine = 0.4535 * Ptotal
Products:
Mole fraction of products = (75.9% com) = 0.759
Partial pressure of products = 0.759 * Ptotal
Total pressure = 0.1155*Ptotal + 0.4535*Ptotal + 0.759*Ptotal = 1.320*Ptotal
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PLZ HELP !!!!
Will give Brainlist
Answer:
Li, Na, K
Explanation:
They are all group 1 metals
how many elements are there
Answer:
there r 118 elements in periodic table..
hope it helps.
Explanation:
there are 118 elements.
What would happen to the boilling point of water at 8000m above sea level where air pressure is lower
The boiling point will be lower, because water boils when its vapor pressure is equal to atmospheric pressure.
What is atmospheric pressure?Atmospheric pressure is described as the force exerted on a surface by the air above it as gravity pulls it to Earth. Atmospheric pressure is commonly measured with a barometer.
If you are at 8 000 m above sea level, the air pressure is lower than one atmosphere and the equilibrium between the water and air pressures will be reached before.
In conclusion, Atmospheric pressure is caused by the weight of the air molecules above.
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The boiling point of water at 8000m above sea level where air pressure is lower would be significantly lower.
How does air pressure affect boiling point ?The boiling point of water decreases as the air pressure decreases. At an altitude of 8000 meters above sea level, the air pressure is significantly lower than it is at sea level, so the boiling point of water would also be significantly lower.
At sea level, the normal boiling point of water is 100 degrees Celsius (212 degrees Fahrenheit) at a standard atmospheric pressure of 101.3 kPa. As the altitude increases, the atmospheric pressure decreases, so the boiling point of water decreases as well.
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which of the following formulas represent a covalent molecule?
A)CaS
B)Co2
C)Na2O
D)FeCl3
Answer:
which of the following formulas represent a covalent molecule?
A)CaS
B)Co2
C)Na2O
D)FeCl3
What determines whether a metamorphic rock is foliated or non foliated?
- The number of remaining gas molecules
-Temperature, pressure, and the original type of rock
-The water content as a percentage of the rock volume
The presence or absence of mineral crystals
Temperature, pressure, and the original type of rock is the correct answer i PROMISE :)
Calculate the molarity of the following solution: 0.50 moles of MgCl2 in 150 milliliters of solution.
Answer:
3.333M
Explanation:
Basically,
Molarity=(moles of solute)/(litres of solution)
=(0.5 moles)/(150/1000)L
=3.333M
what is the pH of water?
Answer:
7.00
Explanation:
Pure Water is the only purely neutral substance on earth so it has a neutral pH of 7
The two elements that are frequently used for making transistors are
A. boron and aluminium
B. silicon and germanium
C. iridium and tungsten
D. niobium and columbium
The two elements that are frequently used for making transistors are niobium and columbium.
What is an element?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
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Diatomic elements are important. what makes them different from other elemental substances?
Diatomic elements are different from other elemental substances because they consist of two atoms of the same element bound together.
What are Diatomic elements?
Diatomic elements are elements that generally exist as molecules composed of two atoms of the same element. The seven elements that exist as diatomic molecules are hydrogen (H2), oxygen (O2), nitrogen (N2), fluorine (F2), chlorine (Cl2), bromine (Br2), and iodine (I2).
The two atoms form a covalent bond, meaning that each atom shares its outermost electrons with the other atom. This creates a strong bond between the two atoms, making the diatomic element more stable and less reactive than other elemental substances.
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A word used to describe if one substance can be dissolved in another
1. aqueous
2. solvent
3. solution
4. concentration
5. solute
6. soluble
7. cohesion
8. solvation
9. polarity
10. dilution
11. adhesion
12. solubility
Rutherford's scattering experiment demonstrated Question 9 options: the existence of protons. the existence of electrons. the existence of neutrons. that most of the mass of an atom is in its nucleus. that the charge-to-mass ratio of an electron is constant.
He came to the conclusion that mass and positive charge are concentrated at the center of the atom from a small number of alpha particles deflected by huge angles with a 180.
Rutherford discovered that most positively charged alpha particles in his gold foil experiment passed straight through the foil without being deflected, leading him to believe that the majority of the atom's space is largely empty.
He came to the conclusion that mass and positive charge are concentrated at the center of the atom because there are few alpha particles that are deflected by huge angles with a 180. Rutherford Atomic Model - J. J. Thomson's "plum pudding" model was unable to account for some experimental findings related to the atomic structure of elements. British scientist Ernest Rutherford performed.
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I rlly need help with my science hwk its due in tomorrow and I am stuck can any one help me plzz :)
Answer:
Sulfur dioxide relased by the industry=
25%
Explanation:
The amount of sulfur dioxide relased by the industry can be calculated by looking at the values of the other; transport and electricity generation. Since electricity generated sulfur dioxide is 69% + 6% of transport that equals 75%. Pie diagrams always equal a total of 100%.
so simply you minus 75 from 100: 100-75=25%.