Answer:
Petersburg, Russia), Russian chemist who developed the periodic classification of the elements. Mendeleev found that, when all the known chemical elements were arranged in order of increasing atomic weight, the resulting table displayed a recurring pattern, or periodicity, of properties within groups of elements.
Explanation:
Hope this helps!!!
When water molecules gain a hydrogen ion, the ion that forms is _________.
A. hydronium
B. hydroxide
C. water ion
D. hydrogen ion
Answer:hydronium
Explanation:
if two metals has the same specific heat how can distinguish them in two ways
Explanation:
1) Thermal and Electric conductivity
2) Metallic strength
Determina cuantos moles hay en 2.31g de NaCl
Answer:
0.0395 mol NaCl
Explanation:
¡Hola!
En este caso, es necesario para nosotros considerar que las relaciones masa-mol se desarrollan teniendo en cuenta las masas molares de los compuestos involucrados en el sistema. Ahora, dado que este sistema se compone de NaCl, cloruro de sodio como sal de mesa, es posible saber que la masa molar de este es alrededor de 58.44 g/mol.
De esta manera, las moles en 2.31 g se calculan como sigue:
[tex]=2.31gNaCl*\frac{1molNaCl}{58.44gNaCl}\\\\=0.0395molNaCl[/tex]
¡Saludos!
Two ways that salinity can increase
Answer:
Evaporation of ocean water and the formation of sea ice both increase the salinity of the ocean.
Explanation:
2+5*6
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me and him were together for 10 months
413 mg of dried KHP is dissolved in 41 mL of distilled water and titrated with potassium hydroxide (KOH). If it took 20.05 mL of KOH to reach the endpoint, determine the concentration of KOH. Show calculations.
Answer: The concentration of KOH is 0.1 M.
Explanation:
Given: Mass of KHP = 413 mg (1 mg = 0.001 g) = 0.413 g
Volume of KOH = 20.05 mL
Volume of solution = 41 mL
The molecular mass of KHP is 204.22 g/mol
Hence, moles of KHP are calculated as follows.
[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{0.413 g}{204.22 g/mol}\\= 0.002 mol[/tex]
As molarity is the number of moles of a substance present in a liter of solution.
So, molarity of the given solution is as follows.
[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.002 M}{0.041 L}\\= 0.0493 M[/tex]
When the given solution is titrated with KOH then concentration of KOH is calculated as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula.
[tex]M_{1}V_{1} = M_{2}V_{2}\\0.0493 M \times 41 mL = M_{2} \times 20.05 mL\\M_{2} = \frac{0.0493 M \times 41 mL}{20.05 mL}\\= 0.1 M[/tex]
Thus, we can conclude that the concentration of KOH is 0.1 M.
Is cardboard naturally occurring?
Answer:
No, it is not naturally occuring because it is man-made.
The useful metal manganese can be extracted from the mineral rhodochrosite by a two-step process. In the first step, manganese(II) carbonate and oxygen react to form manganese(IV) oxide and carbon dioxide:
2MnCOA9 + 02(g) 2 MnO2(s) + 2 CO2(g)
In the second step, manganese(IV) oxide and aluminum react to form manganese and aluminum oxidide
3Mn02(6)+4Als)3Mnsl20s)
Suppose the yield of the first step is 66% and the yield of the second step is 97'%. Calculate the mass of manganese(II) carbonate required to make 4.0 kg of manganese.
Be sure your answer has a unit symbol, if needed, and is rounded to the correct number of significant digits.
Answer:
The answer is "6.52 kg and 13.1 kg"
Explanation:
For point a:
[tex]Actual\ yield = 6.52 \ kg\\\\Percent \ yield= 66\%\\\\Percent \ yield = \frac{Actual \ yield}{Theoretical\ yield} \times 100 \%\\\\Theoretical\ yield \ of \ MnO_2 = \frac{Actual \ yield}{Percent \ yield} \times 100\%\\\\=\frac{6.52 \ kg}{66 \%} \times 100\% =9.88 \ kg\\\\[/tex]
Equation:
[tex]3MnCO_3 +O_2 \longrightarrow 2MnO_2 + 2CO_2\\\\[/tex]
Calculating the amount of [tex]MnCO_3[/tex]
[tex]= 9.88 \ kg \times \frac{1000 \ g}{1 \ kg} \times \frac{1 \ mol \ MnO_2}{86.94 \ g} \times \frac{2 \ Mol \ MnCO_3}{2 \ mol \ MnO_2} \times \frac{114.95\ g}{1 \ mol \ MnCO_3 }\times \frac{1\ kg}{1000\ g}\\\\= 13.1 \ kg[/tex]
For point b:
[tex]Actual\ yield = 4.0 \ kg\\\\Percent\ yield=97.0\%\\\\Percent \ yield = \frac{Actual \ yield}{Theoretical \ yield} \times 100 \% \\\\Theoretical \ yield\ of\ Mn = \frac{Actual \ yield}{Percent \ yield} \times 100\%\\\\[/tex]
[tex]=\frac{4.0 \ kg}{97.0\%} \times 100\% =4.12 \ kg[/tex]
Equation:
[tex]3MnO_2 +4AL \longrightarrow 3Mn + 2AL_2O_3\\\\[/tex]
Calculating the amount of [tex]MnO_2:[/tex]
[tex]= 4.12 \ kg \times \frac{1000 \ g}{1 \ kg} \times \frac{1 \ mol \ Mn}{54.94 \ g} \times \frac{3 \ Mol \ MnO_2}{3 \ mol \ Mn} \times \frac{86.94 \ g}{1 \ mol \ MnO_2 }\\\\= 6516 \ g \\\\=6.52 \ kg\\\\[/tex]
PLEASE HELPPP WILL MARK BRAINLEST!!
Answer:
A. cell potential.
Explanation:
Hello there!
In this case, according to the Nerst equation:
[tex]Ecell=E\°cell-\frac{0.0592}{n}log(Q)[/tex]
We can say that at equilibrium Ecell=0 and Q=K, so:
[tex]0=E\°cell-\frac{0.0592}{n}log(K)[/tex]
In such a way, we can solve for K as follows:
[tex]log(K)=\frac{nE\°cell}{0.0592}\\\\K=10^{\frac{nE\°cell}{0.0592}}[/tex]
Thus, we infer that E° in this equation is A. cell potential.
Regards!
For each equation, state the reaction type and then balance the equation.
___Na3PO4 + ___HCl → ___H3PO4 + ___NaCl Will give brainliest
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Answer:
Na3PO4+3HCl —> H3PO4+3NaCl
The reaction type for this equation is a double displacement or acid-base reaction, where Na₃PO₄ and HCl exchange ions to form H₃PO₄ and NaCl.
What is double displacement reaction?A double displacement reaction is a type of chemical reaction in which the cations and anions of two different compounds exchange places, producing two new compounds. Double displacement reactions are also known as double replacement, metathesis, or ion-exchange reactions.
To balance the equation, you need to make sure that the number of atoms of each element is equal on both sides of the equation. Here is one possible balanced equation:
2Na₃PO₄+ 6HCl → 2H₃PO₄ + 6NaCl
In this balanced equation, there are:
6 sodium atoms (Na) on both sides
2 phosphorus atoms (P) on both sides
12 oxygen atoms (O) on both sides
6 hydrogen atoms (H) on both sides
Note that you can also write the equation in terms of formulas instead of names:
Na₃PO₄ + 3HCl → H₃PO₄ + 3NaCl
Both equations represent the same chemical reaction, but the second one is more concise.
Find more on double displacement reactions:
https://brainly.com/question/13854110
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if a material conducts heat easily, its a good _____.
It has to be a 18 letter word
Answer:
a thermal conductor
Explanation:
thats what its called
Which of the following is a property of water?
It has a relatively high heat capacity.
It freezes in a short time.
It exists in only the liquid state.
It repels other water molecules.
Answer:
The correct answer is a
A property of water among the given properties It has a relatively high heat capacity. Hence Option (A) is correct
What is Heat Capacity ?Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to an object to produce a unit change in its temperature.
The SI unit of heat capacity is joule per kelvin. Heat capacity is an extensive property.
Therefore, A property of water among the given properties It has a relatively high heat capacity. Hence Option (A) is correct.
Learn more about Heat capacity here ;
https://brainly.com/question/1747943
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PLEASE HELP!!!
A 84.1 g sample of phosphorus reacts with 85.0 g of oxygen gas according to the following chemical equation.
4 P(s) + 5 O2(g) → 2 P₂O5
a. Find the limiting reactant.
b. How many grams of P₂O5 are produced in theory?
c. If only 123 g of P2O5 are produced, what is the percentage yield?
Answer:
(a) oxygen
(b) 154g (to 3sf)
(c) 79.9% (to 3sf)
Explanation:
mass (g) = moles × Mr/Ar
note: eqn means chemical equation
(a)
moles of P = 84.1 ÷ 30.973 = 2.7152 moles
moles of O2 = 85÷2(16) = 2.65625 moles
Assuming all the moles of P is used up,
moles of O2 / moles of phosphorus = 5/4 (according to balanced chemical eqn)
moles of O2 required = 5/4 × 2.7152moles = 3.394 moles (more than supplied which is 2.65625moles)
therefore there is insufficient moles of O2 and the limiting reactant is oxygen.
(b)
moles of P2O5 produced
= 2/5 (according to eqn) × 2.7152
= 1.08608moles
mass of P2O5 produced
= 1.08608 × [ 2(30.973) + 5(16) ]
= 154.164g
= approx. 154g to 3 sig. fig.
(c)
% yield = actual/theoretical yield × 100%
= 123/154 × 100%
= 79.870%
= approx. 79.9% (to 3sf)
18. Calculate the molar mass, by titration calculations, of oxalic acid (H2C204) if 25.00 mL of a 0.750
M KOH solution were required to titrate 0.846 grams of oxalic acid.
Explanation:
[tex]1000 \: ml \: contain \: 0.750 \: moles \\ 25.00 \: ml \: will \: contain \: ( \frac{25 \times 0.75}{1000} ) \: moles \\ = 0.01875 \: moles \\ from \: reaction \: eqn \\ H _{2} C _{2} 0 _{4} + 2KOH - - > K _{2}C _{2} 0 _{4} +2H _{2} 0 \\ 1 \: mole \: of \: oxalic \: reacts \: with \: 2 \: moles \: of \: KOH \\ 0.01875 \: moles \: react \: with \: ( \frac{0.01875 \times 2}{1} ) \\ = 0.0375 \: moles \\ 0.0375 \: moles \: weigh \: 0.846g \\ 1 \: mole \: weighs \: 56g[/tex]
the average kinetic energy of water at 25oC is
Answer: The average kinetic energy of water at [tex]25^{o}C[/tex] is [tex]1.233 \times 10^{-26} J[/tex].
Explanation:
Given: Temperature = [tex]25^{o}C = (25 + 273) K = 298 K[/tex]
Kinetic energy is the energy acquired by the molecules of a substance due to its motion.
Formula to calculate average kinetic energy is as follows.
[tex]K.E = \frac{3}{2}kT[/tex]
where,
T = temperature
k = Boltzmann constant = [tex]1.38 \times 10^{-23} J/K[/tex]
Substitute the value into above formula as follows.
[tex]K.E = \frac{3}{2}kT\\= \frac{3}{2} \times 1.38 \times 10^{-23} J/K \times 298 K \\= 1.233 \times 10^{-26} J[/tex]
Thus, we can conclude that the average kinetic energy of water at [tex]25^{o}C[/tex] is [tex]1.233 \times 10^{-26} J[/tex].
What two forces drive the rock cycle on Earth?
Answer:
The rock cycle is driven by two forces: (1) Earth's internal heat engine, which moves material around in the core and the mantle and leads to slow but significant changes within the crust, and (2) the hydrological cycle, which is the movement of water, ice, and air at the surface, and is powered by the sun.
Explanation:
Calcium metal is burned completely in oxygen to form 11.2g of calcium oxide. Find the volume of the required oxygen. (Ca = 40, O = 16, 32 of oxygen has 24.4L) *
Answer:
2.44 L
Explanation:
Step 1: Write the balanced equation
2 Ca + O₂ ⇒ 2 CaO
Step 2: Calculate the mass of O₂ required to form 11.2 g of CaO
The molar mass of O₂ is 32 g/mol and in the balanced reaction, there is 1 mole of O₂, that is, 1 mol × 32 g/mol = 32 g.
The molar mass of CaO is 56 g/mol and in the balanced reaction, there are 2 moles of CaO, that is, 2 mol × 56 g/mol = 112 g.
11.2 g CaO × 32 g O₂/112 g CaO = 3.2 g O₂
Step 3: Calculate the volume occupied by 3.2 g of O₂
Under the conditions of the task, 32 g of O₂ occupy 24.4 L.
3.2 g × 24.4 L/32 g = 2.44 L
An atom or ion has 7 protons, 7 neutrons, and 6 electrons. Is it positive, negative, or
neutral? Why? What element is it?
Can someone please help!
Answer:
Any atom with six protons, regardless of how much other stuff it has, is a carbon atom. Having 7 neutrons, this would be an atom of Carbon 13 (C-13), a stable isotope of carbon making up 1.1% of natural carbon in the atmosphere and near the Earth's surface. As for the electrons, Carbon has six, but atoms may temporarily pick up or lose electrons in the hurly burly of chemical reactions, solar radiation and so forth. This is a negative ion of C13, which will soon pass on its extra election to an atom which needs it (a positive ion).
Explanation:
https://www.quora.com/What-element-has-6-protons-7-neutrons-and-7-electrons
Un catión tetravalente tiene 50 electrones, si la cantidad de neutrones excede en 20 a su número atómico; hallar su número de masa. a) 162 b) 128 c) 281 d) 234
Answer:
I don't speak espanol
Explanation:
hdhdbdbdbsnsnsndndndnd
A cubic box has a 0.5 meter side. Find the mass of air in the box in kilograms. (1 Liter of air has a mass of 1.3 g). *
m = 0.1625 kg
m = 162.5 kg
m = 16.25 kg
m = 16 kg
A cubic box has a 0.5 meter side. Find the volume of air in the box in a liter? *
V = 2.5 L
V = 0.125 L
V = 125 L
V = 12.5 L
Answer: [tex]m=0.1625\ kg,\ ,V=125\ L[/tex]
Explanation:
Given
The length of the box is [tex]a=0.5\ m[/tex]
1 liter of air has a mass of 1.3 gm
So, the density of air is [tex]1.3\ g/L[/tex]
The volume of the box is
[tex]\Rightarrow a^3=0.5^3\\\Rightarrow 0.125\ m^3\ or\ 125\ L[/tex]
Mass of air in the box is
[tex]\Rightarrow m=\rho \times V\\\Rightarrow m=1.3\times 125\\\Rightarrow m=162.5\ gm\ or\ 0.1625\ kg[/tex]
Can someone answer 4 chemistry questions for brainliest ?
Answer:
Hydrochloric acid + zinc = zinc chloride + hydrogen gas
sulfuric acid + magnesium oxide = zinc sulfate + water
nitric acid + lead carbonate = Lead nitrate + carbon dioxide
Sorry can't remember how to do the last one :(
Explanation:
Parallel structure aids the reader's comprehension of ideas and their relative importance True or False
Answer:
This question is obviously true
Explanation:
I would expect
what is the name of the molecule belowwww
Answer:
A) 2-pentene
Explanation:
We count from side where we encounter double bond closest so that's going to be from left to the 2nd carbon. Total carbons are 5.
Thus pent- for prefix of 5 carbons and -ene as suffix for double bond.
2- for locant of double bond.
Thus, 2-pentene
Answer the boxes in the image
Answer: the c thingy is where you be like burgundy sauce then be like racial slair is what it mean's so the name thingy
Explanation:
who is sire sirol from among us?
Answer:
I'm not sure,
Explanation:
Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day!
Hi. I need a full distillation organic chemistry lab report.
Explanation:
The purpose of this seven-page lab report is to use simple and fractional distillation to purify volatile liquids. The boiling points were obtained from the distillate collected drops and the efficiency of the two methods of purification were compared. The introduction experiment, data, conclusion
What is the pH of a 3.5 x 10-5 M solution of HCl?
Answer:
pH = 4.45
Explanation:
We need to find the pH of [tex]3.5\times 10^{-5}\ M[/tex] solution of HCl. We know that, pH of a solution is given by :
[tex]pH=-log[H]^+[/tex]
Put all the values,
[tex]pH=-log[3.5\times 10^{-5}]\\\\pH=4.45[/tex]
So, the pH of the solution of HCl is 4.45.
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Answer:
Hello. I'll help
Explanation:
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TWO HYDROGEN ATOMS COMBINE TO FORM HELIUM ATOMS RESULTING IN THE FORMATION OF...
when two heavy hydrogens combine to for helium , it results in the formation of energy, and a neutron, along with the helium atom
Answer:
When two nuclei form one atom, fusion reactions occur. Two hydrogen atoms combine to produce helium with the sun's reaction. It looks very simplified as follows: H+ H + D + D + H + D. This is referred to as a mass deficit and that mass differential becomes energy.
Explanation:
how many moles of solute are in 9.03 M solution with 15.8 L of solution?
Answer:
Explanation:
How many moles of solute are in 9.03 M solution with 15.8 L of solution?