1.34 x 10^{-3} is the concentration of NH4 .
What is pH ?
pH, a quantitative measure of the acidity or basicity of aqueous or other liquid solutions. Widely used in chemistry, biology, and agriculture, this term translates the concentration value of hydrogen ions. This typically ranges from about 1 to 10-14 gram equivalents per liter. Converted to a number between 0 and 14. At neutral (neither acidic nor alkaline), the concentration of hydrogen ions is 10−7 gram equivalents per liter, which corresponds to a pH of 7. Solutions below pH 7 are considered acidic. Solutions with a pH greater than 7 are considered basic or alkaline.
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Addison warms a pure solid substance in a system closed off from the surroundings
This experiment shows that the elements of pure solid substance in a system closed off from the surroundings has increased temperature very fast.
What is a pure solid substance?Pure substances are substances that are built up of only one kind of particle and have a fixed or abiding structure. Pure substances are further confidential as elements and compounds. An element is a substance that comprises only one type or kind of atom. a pure substance has a constant chemical composition.
No affair where you sample a substance, it is the same. For chemistry, the safest examples of pure substances are elements and compounds. So, examples cover gold, silver, helium, sodium chloride, and pure water.
So we can conclude that In chemistry, a pure substance is an element or compound made up of one type of particle.
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Why do all elements have their own unique color? Please explain.
All the element have their own unique color because the every element have their own set of energy levels.
According to the bohr model of atoms : electrons exist at certain energy levels. when we give heat to electron , it gets excited and moves from lower energy level to higher energy level. the electron is less stable in higher energy level. when an electron returns from higher energy level to lower energy level it emits some energy in form of radiation. The wavelength of light depends upon energy level . and every elements have their own unique energy levels. The color for different element is different.
Thus, All the element have their own unique color because the every element have their own set of energy levels.
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gravity sample work connection’s academy
PLEASE HELP AS SOON AS POSSIBLE WILL MARK BRAINIEST
Answer:
search on YT Khan academy work done by gravity
Explanation:
you will get it for sure with best explanation
mark me please on brainlest
I need help with #5 please. thank you
Answer:
Atom 3
Explanation:
Because it has electronic configuration of 10 which it is an atomic number of neon. And neon is a gas which is stable, hence does not react
24. The thumbprint-shaped region on the pressure/enthalpy
chart is called the
A. saturation curve.
B. saturation cycle.
C. superheated curve.
D. superheated region.
The thumbprint-shaped region on the pressure/enthalpy chart is called saturation curve
An enthalpy chart show the A/C cycle and at what temprature and pressure the refrigerant changes from gas to liquid and back to gas and the vapor liquid saturation curve of the pure substances is important from both the practical and thermodynamic viewpoint because it provide basic information on the behavior of the fluid as well as on its properties and the loop is the most common type of fingerprint and the ridges form elongated loop and some people have double loop fingerprint
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I need help with this
bace, acid and I'd not
bace, acid
During complete combustion, natural gas combines with oxygen to produce _____.
methane and water vapor
carbon dioxide and water vapor
carbon monoxide and water vapor
carbon dioxide and carbon monoxide
Answer:
During complete combustion, natural gas combines with oxygen to produce carbon dioxide and water vapor.
Explanation:
A fuel undergoes a complete combustion process when it swiftly combines with oxygen (O2), which then forms carbon dioxide (CO2) and water (H2O).
How many grams of a 12.5 % sugar solution contain 56.0 g of sugar?
Considering the definition of percentage by mass, 448 grams of a 12.5 % sugar solution contain 56.0 g of sugar
Percentage by massThe percentage by mass expresses the concentration and is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage:
percent by mass= (mass of solute÷ mass of solution)×100%
Mass of sugar solutionIn this case, you know:
percent by mass= 12.5%mass of sugar= 56 gmass of solution= ?Replacing in the definition of percent by mass:
12.5%= (56 g÷ mass of solution)×100%
Solving:
12.5%÷ 100%= 56 g÷ mass of solution
12.5%÷ 100%= 56 g÷ mass of solution
0.125= 56 g÷ mass of solution
0.125× mass of solution= 56 g
mass of solution= 56 g÷ 0.125
mass of solution= 448 g
Finally, the mass of solution is 448 grams.
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Use the equation GPE = mx 9.8 m/s xh to calculate the gravitational potential of a 10-kg
sack of groceries on a shelf 1 m above the floor?
A 10-kg bag of goods on a shelf one meter above the ground has a gravitational potential of GPE= (10 kg)(9.8 m/s2) (1 m) GPE= 98
GRAVITATIONAL POTENTIAL: the energy possessed or acquired by an object due to a change in its position when it is present in a gravitational field. In simple terms, it can be said that gravitational potential energy is an energy that is related to gravitational force or to gravity
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Consider a heat engine that uses reservoirs at 800°C and 0°C.
(a) Calculate the maximum possible efficiency.
(b) If Qh is 1000 J, find the maximum value of -w and the minimum value of -Qc. R = 8,314 J/mol. K
The maximum possible efficiency of the heat engine that uses reservoirs at 800°C and 0°C is 74%.
Maximum efficiency is mainly calculated for heat engines.
Let the starting temperature be T1 and the 2nd temperature is T2.
Since the given temperatures are in Celcius form, we have to first convert the temperatures into Kelvin form for proper calculation of maximum efficiency.
So, T1 = 0 + 273 = 273 K
T2 = 800 + 273 = 1073 K
We know,
Maximum efficiency = (T2- T1)/T2
= (1073 - 273) / 1073
= 800 / 1073
= 0.74
= 74 %
Therefore, the maximum efficiency of the heat engine will be 74%.
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A compound is composed of element X and hydrogen. Analysis shows the compound to be 80% x by mass, eith three times as many hydrogen as X atomes per molecule. Which element is element X?
Based on the percentage composition and the empirical formula of the compound, the element X is carbon.
What is the element X in the compound?The element X in the compound can be determined from the empirical formula of the compound and the percentage composition by mass of the element x.
The empirical formula of the compound is given from the statement; there are three times as many hydrogens as X atoms per molecule.
Empirical formula = XH₃
Assuming the mass of the compound is 100 g
80 g = X
20 g = 3 H
1 H = 20/3
mass ratio of X and H = 80 : 20/3
Mass ratio of X and H = 12 : 1
Hence, X is carbon.
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The substances sodium (Na), oxygen (O₂), and sodium oxide (Na2O) participate in this chemical reaction:
4Na + O2 → 2Na₂O.
Which statement best describes the reaction?
Sodium oxide is created by the chemical reaction statement best describes the reaction .
What is chemical reaction ?
Chemical reactions happen absolutely everywhere. While we sometimes associate chemical reactions with the sterile environment of test tubes and laboratories, nothing is farther from the truth. In fact, a vast number of transformations are creating a dizzying and almost incomprehensible series of new matter and energy changes in our world every second of every day.
In nature, chemical reactions are much more uncontrollable and sometimes much more complex than in the laboratory. Chemical reactions usually occur as needed. The fire raging in the forest, the slow rusting process of iron over the years in the presence of oxygen and water, or the delicate ripening of the fruit on the tree, the process of transforming various chemicals... ( The transformation of one group of substances (products) into another group of substances (products) is a so-called chemical reaction.
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Without using the periodic table, determine the group, period, and block of an atom with the following electron configurations a. [ne]3s^2
The element is in 2nd group, 3rd period and s block.
How to check the group, period and block of the elements by looking at the electronic configuration?
The total number of valence electron gives us the group, the total number of shells gives us the period and the shell which the valence electron is entering tells us about the block it belongs to.
In [Ne]3s2, the valence electron is 2, the number of shells is 3 that is 1,2 and 3. the valence electron is entering the the s subshell.
Therefore, in [Ne]3s2, the group is 2nd, the period is 3 and it belongs to s block.
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What is the possible chemical formula formed between Hydrogen ion and Nitrate
ion?
H₂NO3
H₂NO3
H3NO2
HNO3
iupac name
answerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
Answers answer questions and
The reaction shown has first order kinetics:
2H2 O2 (1) —> 2H2 O (1) + O2 (g)
If originally a solution of 0.600 M H2O2, its concentration was found to be 0.0750 M after 54.0 min.
In how many minutes will the concentration be 0.300M?
A) 6.80
B) 18.0
C) 14.0
D) 28.0 E) 54.0
Option B. 1n 18 minutes the concentration of a solution of 0.600 M changes to 0.300M.
An order of first-order kinetics in which the rate of the reaction relies upon the concentration of only one reactant, and is proportional to the amount of the reactant. it could be represented via the equation, charge = kA, in which ok is the reaction fee steady, and A is the concentration of the reactant.
Calculation:-
T = 2.303/k log a/(a-x)
K = 2.303/T log a/(a-x)
= 2.303/54 log(0.600/0.0750)
K = 2.303/54 log 8
= 2.303/54 × 0.9
= 0.038
new concentration = 0.300M
T = 2.303/k log a/(a-x)
= 2.303/ 0.038 log 0.600/(0.300)
= 0.693/0.038
= 18.2 minutes
or 18 minutes approx.
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true or false
Newton's first law of inertia says that an object at rest will stay at rest and an object in motion will stay in motion unless acted on by a force.
Newton's first law of inertia says that an object at rest will stay at rest and an object in motion will stay in motion unless acted on by a force; thus the statement is True
What is the law of inertia?The law of inertia is also known as Newton's first law of motion.
The law of inertia states that a body at rest or that is moving at constant or uniform motion along a straight line will remain in its state of rest or motion or uniform motion along a straight line unless acted upon by an external force.
The law of inertia explains why it s difficult to start an object moving or to stop a moving object.
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Commercial concentrated nitric acid, HNO3, is 15.8 M. What volume of concentrated HNO3 would be required to prepare 842 mL of 7.77 M HNO3?
The volume of the concentrated HNO₃ that would be required to prepare 842 mL of 7.77 M HNO₃ is 414 mL
How do I determine the volume concentrated HNO₃ required?We can obtain the volume of the concentrated HNO₃ required to prepare 842 mL of 7.77 M HNO₃ by using the dilution formula as shown below:
Molarity of concentrated HNO₃ (M₁) = 15.8 MVolume of diluted solution (V₂) = 842 mL Molarity of diluted solution (M₂) = 7.77 MVolume of concentrated HNO₃ (V₁) =?M₁V₁ = M₂V₂
15.8 × V₁ = 7.77 × 842
15.8 × V₁ = 6542.34
Divide both side by 15.8
V₁ = 6542.34 / 15.8
V₁ = 414 mL
Thus, the volume of concentrated HNO₃ required is 414 mL
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An element is a substance formed of
Answer:
the same kind of atoms
Explanation:
the same kind of atoms
covert 3.20 bar to atm
Taking into account the change of units, the 3.20 bar in atm is 3.15815 atm.
Rule of threeThe rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
If the relationship between the magnitudes is direct, the direct rule of three must be applied. To solve a direct rule of three, the following expression must be followed, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: x= (c×b)÷a
The direct rule of three is the rule applied in this case where there is a change of units.
Conversion of units in this caseYou can apply the following rule of three: if 1.01325 bar equals 1 atm, 3.20 bar equals how many atm?
1.01325 bar ⇒ 1 atm
3.20 bar ⇒ x
So: x= (3.20 bar× 1 atm)÷ 1.01325 bar
Solving:
x= 3.15815 atm
In summary, the pressure is 3.15815 atm.
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5. What process occurs when large swaths of forest are cut down, damaging the landscape in an area?
combustion
deforestation
denitrification
nitrogen-fixation
Answer:
deforestation
Explanation:
deforestation is clearing Earth's forests on a massive scale, often resulting in damage to the quality of the land. Forests still cover about 30 percent of the world's land area, but swaths the size of Panama are lost each and every year.
Why might a chemist add a buffer to a solution?
The buffer can keep the pH stable when small amounts of acid or base are added.
The buffer can magnify the changes to pH caused by adding small amounts of acid or base.
The buffer changes color to indicate the pH of the solution.
The buffer reacts with the acid or base in solution to form a useful product.
A chemist adds a buffer to a solution because the buffer can keep the pH stable when small amounts of acid or base are added. Thus, Option A is correct.
Buffer is a solution that resists the change in pH when acid or alkali is added in a small amount. Buffer is made up of weak acid and its conjugate base or a weak base and its conjugate acid. It absorbs H+ and OH- ions when strong acid or alkali is added so that the pH remains the same and neutralizes the added acid or alkali. While maintaining the pH of the solution, the pH of the buffer changes in a small amount.
Thus, a chemist adds a buffer to a solution to keep the pH constant when strong acid or base is added.
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Why is NaCl called sodium chloride but CO is ca bin monoxide
Answer:
Sodium Chloride is a chemical compound that has a chemical formula NaCl.
NaCl is not taken into account as a molecule.
A molecule is the smallest particle in a chemical element or compound that contains that element's or substance's chemical properties.
Molecules are made up of atoms that are chemically bound together.
Covalent Bonding is a term that refers to the bonding of two or more Ionic compounds, such as sodium chloride (NaCl), which is created by transferring electrons that form ions.
Ions create ionic bonds by exerting electrostatic force on one another.
In a water molecule, on the other hand, the hydrogen and oxygen atoms are joined by swapping electrons rather than transferring them.
what has the biologist Rahul Kumar came to India to find
It is to be noted that Rahul Kumar the biologist came to India to find problems that he can solve using his knowledge in Biology.
Who is Rahul Kumar?Rahul Kumar, an Indian and the son of a migrant worker from Bihar, graduated with honors from IIT Roorkee and is currently on his way to the United States to pursue his PhD at the University of Utah.
A biologist is a scientist who undertakes biological study. Biologists are interested in researching all forms of life on Earth, whether they be single cells, multicellular organisms, or communities of interacting individuals. They often specialize in a single field of biology and have a specialized research emphasis.
The majority of biologists work full-time at government agencies, private research laboratories, medical testing facilities, higher education institutions, or other research facilities.
Physician's assistants, radiation and nuclear medicine technologists, and registered nurses are among the hospital employment available to those with a bachelor's degree in biology. These positions can also be found in clinics, physicians' offices, nursing homes, rehabilitation institutions, government organizations, the military, and other settings.
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what mass of iron(III) oxide must be used to produce 10.6g iron?
The mass of iron (II) oxide that must be used to produce 10.6 g of iron would be 14.37 grams.
Stoichiometric problemIron is produced from iron (II) oxide by reacting with carbon monoxide according to the following equation:
[tex]Fe_2O_3 + 3CO -- > 2Fe + 3CO_2[/tex]
The equation already obeys the law of conservation of atoms. Hence. it is a balanced equation.
The mole ratio of iron (III) oxide that reacts and the iron that is produced according to the equation is 1:2.
Now, in a particular reaction involving iron (III) oxide and carbon monoxide, 10.6 grams of iron were produced. The amount of iron (III) oxide used can be obtained using the mole ratio from the balanced equation of the reaction.
Recall that: mole = mass/molar mass
Molar weight of iron = 56 g/mol
Mole of 10.6 g of iron = 10.6/56
= 0.19 moles
Since the mole ratio is 1:2, the equivalent mole of iron (III) oxide that reacts can be obtained:
0.19/2 = 0.09 moles
Molar mass of iron (III) oxide = 159.69 g/mol
Mass of 0.09 mol iron (III) oxide = 0.09 x 159.69
= 14.37 grams
Thus, the amount of iron (III) oxide that must be used to produce 10.6 g of iron would be 14.37 grams.
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why were gold and copper the first forms of matter investigated by humans??
Gold and copper were the first forms of matter investigated by humans because they were pretty and have a shiny appearance.
Gold and copper have a shiny face and they were used in the production of ornaments and jewelry. Along with jewelry many other precious items were made from gold and copper. Gold and copper were so valuable forms of matter and they are also economically used by many countries. Gold was mostly used in making of ornaments and copper was used in making of frames.
In today's modern world mainly gold is one of the most precious element which is obtained for economical use.
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For Silicon atoms, which I value will show exceptionally large increase over preceding IE values IE1, IE2, IE3, IE4, IE5, IE6
The ionization energy of the fifth electron IE5 would be exceptionally large.
What is the exceptionally large ionization energy?We know that the ionization energy is the energy that is required to remove an electron from an atom. This is the energy that must be supplied in order to make the electron to be able to escape the attractive force of the nucleus of the atom.
We know that Silicon has four electrons in the outermost shell. It is known that electrons that are in the same shell would have relatively close values of ionization energy.
The ionization energy values IE1, IE2, IE3, IE4 all belong to the outermost shell hence we would have an exceptionally large increase over preceding IE values at IE5.
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a forest is a habitat for many living things. what happens to these different living things
Forest is a habitat for many plants and animals because it provides a suitable environment for them.
Forest is a habitat for many plant life and animals as it offers a appropriate environment for them. As an instance, neem, Sheesham, Palash, tiger, porcupine, elephants, jackal and so forth. The ground beneath the tree of the forest is the forest floor.
It causes habitat destruction, accelerated chance of predation, reduced food availability, and lots greater. As a result, some animals lose their homes, others lose meals assets – and ultimately, many lose their lives. In reality, deforestation is one of the essential causes of extinction.
Weather trade also alters the life cycles of flora and animals. as an instance, as temperatures get warmer, many plant life are starting to develop and bloom earlier inside the spring and live to tell the tale longer into the fall. A few animals are waking from hibernation sooner or migrating at different instances, too.
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Calculate the molar it’s of a phosphoric acid solution if 34.21mL of 0.0431M sodium hydroxide neutralizes 25.00mL of the acid solution
According to the concept of molar concentration, the molarity of phosphoric acid solution is 0.0589 M.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.In case where two solutions are given, molarity of one solution is obtained as, M₁V₁=M₂V₂
Substitution in above formula gives, 0.0431×34.21/25=0.0589 M.
Thus the molarity of phosphoric acid is 0.0589 M.
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Which element is used in "yellow" muted lights?
sodium
carbon
nitrogen
aluminum
Sodium is used in "yellow" muted lights because it produces a yellow-orange light when it is heated.
What is Sodium?
Sodium is a chemical element with atomic number 11 and the symbol Na (derived from the Latin natrium). It is a delicate, silvery-white metal that is very reactive. Due to its placement in group 1 of the periodic table, sodium is an alkali metal. 23Na is the only stable isotope of it. The free metal must be prepared from compounds because it does not exist in nature. The sixth most common element in the crust of the Earth is sodium, which can be found in a variety of minerals like feldspar, sodalite, and halite (NaCl). Since the action of water has been leaching sodium ions from the minerals of the Earth for aeons, many salts of sodium are highly water-soluble. As a result, sodium and chlorine are the most prevalent dissolved elements by weight in the oceans.
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