Answer: [tex]0.65\ J/g.^{\circ}C[/tex]
Explanation:
Given
Mass of iron piece is [tex]m=17.98\ g[/tex]
Heat absorbed [tex]Q=2056.5\ J[/tex]
Temperature changes from [tex]25^{\circ}C\ to\ 200^{\circ}C[/tex] i.e.
[tex]\Delta T=200-25=175^{\circ}C[/tex]
Heat absorbed is given by [tex]Q=mc\Delta T\quad [c=\text{specific heat of material}][/tex]
Insert the values
[tex]\Rightarrow 2056.5=17.98\times c\times 175\\\\\Rightarrow c=\dfrac{2056.5}{3146.5}\\\\\Rightarrow c=0.65\ J/g.^{\circ}C[/tex]
Thus, the specific heat of iron is [tex]0.65\ J/g.^{\circ}C[/tex]
Please hurry!!! And help!!
*URGENT*
Best answer gets marked Brainliest!
The table below shows several minerals found in earths crust based on the information in the table which mineral is also an element
A) Calcite
B) quartz
C) hematite
D) graphite
Answer:
Graphite, because it has atoms of same atomic and electrovalent electrons
What happens when a solid turns straight into gas and skips the liquid stage?
Answer:
Explanation:
Liquid to solid phase transitions are known as "freezing.". Solid to liquid phase transitions are known as "melting.". Solid to gas phase transitions are known as "sublimation.". In most cases, solids turn into gases only after an intermediate liquid state.
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.
if two metals has the same specific heat how can distinguish them in two ways
Explanation:
1) Thermal and Electric conductivity
2) Metallic strength
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:
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:
calculate the wavelength of yellow light with the energy of 3.45x10-19 J
Answer: The wavelength of yellow light with the energy of [tex]3.45 \times 10^{-19} J[/tex] is [tex]5.76 \times 10^{-7} m[/tex].
Explanation:
Given: Energy = [tex]3.45 \times 10^{-19} J[/tex]
Formula used to calculate the wavelength is as follows.
[tex]E = \frac{hc}{\lambda}[/tex]
where,
E = energy
h = Planck's constant = [tex]6.63 \times 10^{-34} Js[/tex]
c = speed of light = [tex]3 \times 10^{8} m/s[/tex]
[tex]\lambda[/tex] = wavelength
Substitute the values into above formula as follows.
[tex]E = \frac{hc}{\lambda}\\3.45 \times 10^{-19} J = \frac{6.63 \times 10^{-34} Js \times 3 \times 10^{8} m/s}{\lambda}\\\lambda = 5.76 \times 10^{-7} m[/tex]
Thus, we can conclude that the wavelength of yellow light with the energy of [tex]3.45 \times 10^{-19} J[/tex] is [tex]5.76 \times 10^{-7} m[/tex].
What properties of the elements did Mendeleev study?
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!!!
For each equation, state the reaction type and then balance the equation.
___Na3PO4 + ___HCl → ___H3PO4 + ___NaCl Will give brainliest
NOT A DOWNLOAD CMON
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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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
convert 32 degrees celsius to kelvin
Answer:
305.15
Explanation:
32 celsius converted to kelvin is 305.15 kelvin
Formula
32°C + 273.15 = 305.15K
2+5*6
how to get over someone
me and him were together for 10 months
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!
A chemist has a small amount of compound that has the boiling point 65°c that must be fractionally distilled. Yet, the chemist doesn't want to lose any of the compound to hold up on the column. What the chemist should do?
Answer:
A "chaser," a high-boiling compound whose vapors will displace the vapors of the desired low-boiling compound, can be used to distill a small amount of compound.
A smaller fractionation apparatus or a Vigreux column could be used instead.
Explanation:
Which statement describes the law of conservation of energy?
A. All systems will exchange matter and energy with their surroundings.
B. All systems can exchange energy, but not matter, with their surroundings.
C. Energy cannot be created nor destroyed, but it changes from one form to another.
D. Energy is destroyed in most chemical reactions when new products are formed.
Answer:
Energy cannot be created nor destroyed, but it changes from one form to another.
Explanation: got it
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
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!
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)
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
Write the balanced half equation of iron 2 and permanganate in a solution of acid. Show all of your work.
Answer:
5Fe⁺² + MnO₄⁻ + 8H⁺ => 5Fe⁺³ + Mn⁺² + 4H₂O
Explanation:
Fe⁺² + MnO₄⁻ + H⁺ => Mn⁺² + Fe⁺³ + H₂O
5(Fe⁺² => Fe⁺³ + 1e⁻) => 5Fe⁺² => 5Fe⁺³ + 5e⁻
MnO₄⁻ + 5e⁻ => Mn⁺² => MnO₄⁻ + 8H⁺ + 5e⁻ => Mn⁺² + 4H₂O
=> 5Fe⁺² + MnO₄⁻ + 8H⁺ => 5Fe⁺³ + Mn⁺² + 4H₂O
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?
What common compounds are in selenium? Where are these compounds found and what are they used for? What properties do they have?
Please answer AS SOON AS POSSIBLE!!! Thanks!!!!!
Answer:
tanaka..........................
elect the best choice, and briefly indicate the reason for your choice: a. Lowest ionization energy: K Rb Cs b. Most favorable electron affinity: Cl Br I c. Most energy required to remove an electron: Cu Cu Cu2
Answer:
Lowest ionization energy: Cs
Most favorable electron affinity: Cl
Most energy required to remove an electron: Cu2+
Explanation:
Ionization energy decreases down the group. That means that as we move down the group, the ionization energy of elements decreases due to greater distance of the outermost electron from the nucleus and greater screening effect of inner electrons on this outermost electron. Hence Cs has the lowest ionization energy.
Electron affinity of halogens decreases down the group. Hence, Cl possess the most favorable electron affinity.
When an electron has been removed from an atom, the removal of the next electron is usually harder. Thus, the second ionization energy is always greater than the first ionization energy and so on. Thus, it is most difficult to remove an electron from Cu^2+ from which two electrons have already been removed.
Which reaction type is the following: AgF + CaCl2 --> AgCl + CaF2
Explanation:
[tex]{\small{\underline{\bf{\red{answer...}}}}} \\ \\ [/tex]
[tex]\small\mathfrak\purple{Double \: displacement \: reaction} \\ \\ \small\mathfrak\orange{hope \: it \: helps...}[/tex]
12. Convert 1.98 grams of PbSo, to molecules.
No links please
Answer:
3.93 × 10²¹ molecules
Explanation:
Convert 1.98 grams of PbSO₄ to molecules.
Step 1: Given data
Mass of PbSO₄: 1.98 g
Step 2: Calculate the number of moles corresponding to 1.98 g of PbSO₄
The molar mass of PbSO₄ is 303.26 g/mol.
1.98 g × 1 mol/303.26 g = 6.53 × 10⁻³ mol
Step 3: Calculate the number of molecules in 6.53 × 10⁻³ moles of PbSO₄
To convert moles to molecules, we need a conversion factor: Avogadro's number. There are 6.02 × 10²³ molecules of PbSO₄ in 1 mole of molecules of PbSO₄.
6.53 × 10⁻³ mol × 6.02 × 10²³ molecules/1 mol = 3.93 × 10²¹ molecules
Why do different parts of the world have such different animals?
Answer:
a
Explanation:
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:
Given the following information: SO2(g) + 12 O2(g) = SO3(g) Kp = 2.5E-2 What is the Kp value for the following reaction: 2 SO2(g) + O2(g) = 2 SO3(g)
Answer:
K = 6.25x10⁻⁴
Explanation:
Based on the reaction:
SO₂ + 1/2 O₂ ⇄ SO₃ Kp = 2.5x10⁻²
We can find the Kp of a similar reaction using Hess's law where the sum of 2 reactions a and b produce a K that is:
K = Ka*Kb
The sum of twice the reaction of the problem:
SO₂ + 1/2 O₂ ⇄ SO₃
+ SO₂ + 1/2 O₂ ⇄ SO₃
2SO₂ + O₂ ⇄ 2SO₃
Where K must be:
K = Kp*Kp = Kp²
K = (2.5x10⁻²)²
K = 6.25x10⁻⁴18. 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]