Answer:
solo esto se responderte
Explanation:
Algunos solutos (por ejemplo, cloruro de sodio (NaCl) en agua) exhiben una solubilidad bastante independiente de la temperatura. Unos pocos, como el sulfato de cerio (III) y el carbonato de litio, se vuelven menos solubles en agua a medida que aumenta la temperatura.
Calculate the pressure (in kpa) of 1.5 mole of helium gas at 354 k when it occupies a volume of 16.5l.
Answer:
267.57 kPa
Explanation:
Ideal gas law:
PV = n RT R = 8.314462 L-kPa/K-mol
P (16.5) = 1.5 (8.314462)(354) P = 267.57 kPa
A sample of lead released 2,744 J when it cooled from 90 to 19 °C. What was the
mass of the sample of lead? (The specific heat of lead is 0.129 J/g x °C)
Answer:
299.60 g
Explanation:
Use the formula q = mCΔT (q= heat, m= mass, c = specific heat for that specific substance, ΔT is change in temperature Final Temp - Initial Temp)
Released heat means it has negative sign.
q = mCΔT
-2744 = (mass) (0.129) (19-90)
mass= 299.60 g
kindly help me
i am confused
i will mark you brainlist
Explanation:
a) 2 (Cr)³+ + 3 BiO3- + 4 H+ → 3 (Bi)3+ + Cr2O72- + 2 H2O
b)
have posted a similar question in the image for the phosgene i hope it helps little
Which reactant controls the amount of product formed?.
Answer:
limiting reactant gives ................
Answer:
Limiting Reagent or Limiting Reactant
Explanation:
The limiting reagent of a reaction is the reactant that runs out first. Once it is completely consumed, the reaction stops.The limiting reagent is the only chemical that is used to calculate the theoretical yield. It is used up first. After that, any excess reagent will not be able to produce more products.And to assess which reactant is which, we must usually have quantities of each reagent in a chemical reaction...and of course we should write a stoichiometric equation that is balanced with respect to mass and charge in order to assess the stoichiometric equivalence.
We could examine for instance, the combustion of methane gas, the which MAY have cooked your dinner … its combustion reaction is as shown...
[tex]CH_4(g) + 2O_2(g) rarr CO_2(g) + 2H_2O(g) + Delta[/tex]
And here conditions of COMPLETE combustion pertain; there is DIOXYGEN in excess, AND methane is the limiting reagent. A [tex]10*g[/tex] mass of methane represents a molar quantity of …
[tex](10.0*g)/(16.01*g*mol^-1)=0.623*mol[/tex]
And with respect to dioxygen we thus require...
[tex]0.623*mol*32.00*g*mol^-1=40*g[/tex]
...but this quantity (AND MORE) is available from the atmosphere....and the methane was the limiting reagent....
Why does the hemisphere that is titled away from the sun experience winter?
(science)
If I have 340 mL of a 1.5 M NaBr solution, what will the concentration be if I add 560 mL more water to it?
Answer:
0.5667 M ≅ 0.57 M.
Explanation:
It is known that the no. of millimoles of a solution before dilution is equal to the no. of millimoles of the solution after the dilution.
It can be expressed as:
(MV) before dilution = (MV) after dilution.
M before dilution = 1.5 M, V before dilution = 340 mL.
M after dilution = ??? M, V after dilution = 340 mL + 560 mL = 900 mL.
∴ M after dilution = (MV) before dilution/(V) after dilution = (1.5 M)(340 mL)/(900 mL) = 0.5667 M ≅ 0.57 M.
David runs a 100-m dash while pushing a stroller with a force of 25N. What amount of work does David do on the stroller?
David runs a 100-m dash while pushing a stroller with a force of 25N. The work done by David is 2500 Nm.
What is force?Force is a power that changes the motion of the object.
The displacement is 100 m
The force is 25 N
Work done = force x displacement
25 x 100 = 2500 Nm
Thus, the work done by David is 2500 Nm.
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In IR spectroscopy, a primary amine will produce two signal(s) above 3300 cm-1, because the amino group ________________________.
A primary amine will produce two signal(s) above 3300 [tex]cm^1[/tex], because the amino group has two possible modes of stretching (symmetric and asymmetric)
What is IR?Infrared radiation (IR), sometimes referred to simply as infrared, is a region of the electromagnetic radiation spectrum where wavelengths range from about 700 nanometers (nm) to 1 millimeter (mm).
The N-H stretches of amines are in the region 3300[tex]cm^1[/tex].
These bands are weaker and sharper than those of the alcohol O-H stretches which appear in the same region.
In primary amines ([tex]RNH_2[/tex]), there two bands in this region, the asymmetrical N-H stretch and the symmetrical N-H stretch.
Hence, In IR spectroscopy a primary amine will produce two signal(s) above 3300 cm-1, because the amino group has two possible modes of stretching (symmetric and asymmetric).
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Part A The first step to engineering is to define the problem. Write down the problem the students have to solve, and describe the challenges they will face when coming up with a solution.
WILL MARK BRAINLIEST!!
Answer:
Engineering is all about solving problems using math, science, and technical knowledge. And engineers have solved a lot of problems in the world by designing and building various technologies. We have everything from machines that can breathe for you in hospitals to suspension bridges to computers we use every day. All of these things were once designed by engineers using the engineering design process.
Explanation:
Answer:
Students will have to use their brains to solve problems and challenges they will face to find a solution to cleaning up oil spills. Students will face failures after completing their solution, lots of research, and problems during the making of their solutions. What will work? What won't?
Explanation:
Hope this helps!
Define density please thanks!!
An HNO3 (ag) solution has a pH of 1.75. What is the molarconcentration of the HNO3(aq) solution?
⇒ 0.018
-use pH=-log[H3O+]
-solve for H3O+
2. Observe Examine the flame closely. Is it the wax or the wick that burns?
Answer:
Wax
Explanation:
The combustible material in a candle or its fuel is wax. Before the wax can become fuel, it first needs to get hot enough. To start that heating process, you first need to light the wick with another source of fire, such as a match. As the wick burns down the heat of the flame melts the wax around the wick.
A few drops of food coloring are put into two containers of water. Observations are shown in the table. Which statement best explains the observations in the table? A) The temperature of sample 1 is higher than the temperature of sample 2 B) The molecules in sample 1 are moving faster than the molecules of sample 2 C) The temperature of sample 2 is higher than the temperature of sample 1 D) The water molecules in sample 2 are moving slower than the molecules in sample 1
Answer:
C
Explanation:
Increasing temp causes increased molecule movment in sample 2
Which equation represents a combustion reaction?
1) 4fe + 3o2 = 2fe2o3
2) 2h2o = 2h2+o2
3) 2agno3 + h2s = ag2s + 2nho3
4) 2al + n2= 2aln
Answer:
2
Explanation:
do take note that combustion reactions releases oxygen.
2.0 mL of a 0.75 M solution of potassium permanganate , KMnO4 solution is used to make a 500 mL solution . What is the concentration of the new solution ?
The concentration of the new solution is 0.003 M.
How do we calculate the required concentration?Required concentration of the final solution will be calculated by using the below equation as:
M₁V₁ = M₂V₂, where
M₁ & V₁ are the molarity and volume of initial solution.
M₂ & V₂ are the molarity and volume of final solution.
On putting values from the question, we get
M₂ = (0.75)(2) / (500) = 0.003 M
Hence required concentration is 0.003M.
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Explain why a solution of calcium conducts electricity but solid calcium chloride does not
Answer:
because the ions arent firmly held in place!
Explanation:
Which hydrocarbon will undergo a substitution reaction with chlorine.
The hydrocarbons that will undergo substitution reactions with chlorine would be those that are saturated.
What are saturated hydrocarbons?They are hydrocarbons that contain no double or triple carbon to carbon bonds.
Such hydrocarbons cannot undergo addition reactions unlike those that contain double or triple bonds.
Alternatively, saturated hydrocarbons are able to undergo substitution reactions with chlorine in the presence of light, with hydrogen being displaced in the process.
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A given substance has a melting point of -7 oC and a boiling point of 59 oC. This substance exists as a ____________ at room temperature conditions. Note: room temperature is 25 oC.
A given substance that has a melting point of -7C and a boiling point of 59C exists as a liquid at room temperature conditions.
What are the states of matter?The states of matter refer to the separation of the molecules of a given material in certain temperature conditions.
The states of the matter are three and include the gaseous state, liquid state and solid-state.
In conclusion, a given substance that has a melting point of -7C and a boiling point of 59C exists as a liquid at room temperature conditions.
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the temperature of gas is raised by 100 deggres to 200 deggres. what happens to the volume of the gas
Answer:
Increases by 100 Pa
Explanation:
According to The Ideal Gas Equation,
the temperature of the gas is directly proportional to the volume of the gas present in itIf the temperature rises from 100 K to 200 K, then the volume will increase by 100 Pa (standard unit of Pressure)how do atoms show both unity and diversity
Answer: As one atomic dipole nears another atom it will affect the electron density distribution, so for example if the slightly positive end of the atom is located next to another atom, it will attract the electron(s) in the other atom. A covalent bond happens when atoms share an electron between them. The other kind of bond is called ionic, and it happens when one atom gives an electron to another atom. These bonds are held together with electric forces. Two atoms of the same element can be different if their electrons are in different states. If one copper atom has an electron in an excited state and another copper atom has all of its electrons in the ground state, then the two atoms are different.
Answer:
there are relatively few atoms but they can make many molecules
Explanation:
Terbium-147 undergoes positron emission to become a stable atom. what is that stable atom? a. b. c. d. e. f.
Terbium-147 undergoes positron emission to become a stable atom, the stable atom is ₆₄Gd¹⁴⁷.
What are radioactive decay series?Series (or family) of natural radioactive decay is the set of elements with unstable nuclei, which follow an orderly sequence of spontaneous decay, that is, they emit alpha and beta particles, until a stable lead nucleus is created.
In this case, natural radioactive decay occurs when the nucleus of the atom of some chemical element is unstable and then it "breaks", releasing electromagnetic radiation and disintegrating.
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Why is copper a pure substance? a. because it is an element b. because it is a compund c. because it is a homogenous mixture
Answer:
a. because it is an element
Explanation:
its pure because it only has one type of atom, making it an element
look at the screenshot ;)
This is not the best way to organize a periodic table because two elements might have similar atomic mass.
What is periodic table?Periodic table is a chart in which arrangement of chemical elements are done.
In the early periodic table elements are arranged on the basis of their atomic masses, while after sometime Moseley arranged the periodic table on the basis of atomic number as he proposed that properties of an element is justified on the basis of number if electrons.
And mass of two substances may be same so it is difficult to differentiate between them.
Hence, two elements might have similar atomic mass.
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What is the equilibrium constant equation for the chemical process below?
2A + B2 —> A₂B2
Let's see
[tex]\\ \rm\dashrightarrow k=\dfrac{Concentration\:of\: products}{Concentration\:of\: reactants}[/tex]
[tex]\\ \rm\dashrightarrow k=\dfrac{\left[A_2B_2\right]}{\left[A\right]^2\left[B\right]}[/tex]
What is the name of the colony shown?
Answer: New Hampshire
Explanation:
If it is the dark green then its New Hampshire :)
Answer:
New Hampshire ;)
Explanation:
New Hampshire is the dark green state on this map, and it is apart of the first 13 colony I hope that helped.
Which is a non renewable resource A.oil b.sunlight c. Water d.wood
Answer:
(a) Oil
Explanation:
Oil is a renewable source, along with natural gas, coal, and nuclear energy.
lmk is this helped you
~rere
Answer:
A. Oil
Explanation:
Oil, along with natural gas, and coal are called fossil fuels and fossil fuels were formed within the Earth from dead plants and animals millions of years ago.
A student is making tea on a cold day. When he tries to put honey in his tea, the honey will not flow out of the bottle. Describe how the student could make the honey flow out of the bottle more easily, and explain why your method would work.
Answer:
Warming it would make it come out. On a cold day the honey is frozen and atoms will not move as fast and are close toghether. When you warm it the atoms will move faster and the honey will come out of the bottle
Explanation:
An atom was observed with +3 charge, n = 38, and e = 28, What is the element name of the atom?
A. Gallium - 69
B. Nickel - 66
C. Manganese - 63
D. Selenium - 72
Which of these metals must release the most heat to expenence a given decrease in temperature per gram of metal? Aluminum, Lead, and Iron.
Aluminium is the metal which must release the most heat to experience a given decrease in temperature per gram of metal.
What is Thermal conductivity?This is as a result of free electrons and is the ability of a substance to conduct heat.
Aluminium has the highest thermal conductivity in this case which is why it will release the most heat to experience a given decrease in temperature per gram of it.
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The concentration of reactants and products and the rate of reaction were measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8x10^-6 M/s. Which of the following would
explain a lower rate after another 3 seconds?
A) The concentration of reactants increased while the concentration of product decreased
B) The concentration of reactants decreased while the concentration of product increased
C) All concentrations of reactants and products decreased
D) All concentrations of reactants and products increased
Answer: B
Explanation:
