Identified substance which is present in the sample of 55.5g is calcium, because the calculated and actual specific heat is almost same.
What is the relation between specific heat and absorbed heat?Relation between the amount of absorbed heat and specific heat of any substance is shown by following equation:
Q = mcΔT, where
Q = absorbed heat = 0.500kJ = 500Jm = mass of unknown substance = 55.5 gc = specific heatΔT = change in temperature = 14 degrees CelsiusOn putting all these values on the above equation, we get
c = 500 / (55.5)(14) = 0.643 J/g. degrees Celsius
And this value is almost equal to the given specific heat value of calcium, so the given substance is calcium.
Hence the given unknown substance is calcium.
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If the reaction of 5.87 moles of potassium with excess hydrobromic acid was able to produce 2.49 mol H2, what is the percent yield of hydrogen gas? (3 points)
Unbalanced equation: K + HBr yields KBr + H2
1. 14.6%
2. 29.2%
3. 42.4%
4. 84.8%
Answer: 2. 29.2%
Explanation:
why does water boil at 100° Celsius while hydrogen sulphide boils at 58
degrees Celsius?
When vapor pressure reaches an equivalent value to the surrounding air pressure, the liquid(in this case water) will boil. When at sea level, vapor pressure is equal to the atmospheric pressure which is at 100 degrees celsius. Water has a high boiling point because water requires more energy to break its hydrogen bonds before it can boil to high.
I need help finding both conjugate acid and base
15) A 12.0 g sample of helium gas occupies a volume of 12.6 L at a certain temperature and
pressure. What volume does a 24.0 g sample of neon occupy at these conditions of
temperature and pressure?
The required volume of sample of neon occupy at these conditions of temperature and pressure is 25.2L.
How do we convert grams into moles?Mass (W) in grams of helium gas will be converted into moles (n) by using the below equation:
n = W/M, where
M = molar mass = 4g/mol
Initial moles of helium gas:n = 12g / 4g/mol = 3 mol
Final moles of neon gas:n = 24g / 4g/mol = 6 mol
And for this question as pressure and temperature for both the conditions is constant so ideal gas equation becomes:
V₁/n₁ = V₂/n₂, where
V₁ = initial volume = 12.6 L
n₁ = initial moles = 3 mol
V₂ = final volume = ?
n₂ = final moles = 6 mol
On putting these values, we get
V₂ = (12.6)(6) / (3) = 25.2 L
Hence required volume of neon gas is 25.2 L.
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The percentage by mass of calcium carbonate in eggshell was determined by adding gues
hydrochloric acid to ensure that all the coloum carbonate had reacted. The eness is left we
then titrated with aqueous sodium hydroxide,
(a) A student added 27.20 crn' of 0.200 mol dm * HCI to 0.188 g of eggshell. Calculate the
amount, in mol of HCI added,
(b) The excess and requires 23,80 cm' of 0.100 mol dm Noow for neutralization, Caliste
the amount, in mol, of acid that is in excess,
(0) Determine the amount, in mol, of HCl that reacted with the caldum carbonate in the
eggshell
(d) State the equation for the reaction of HCl with the calcium carbonate in the eggshell.
(e) Determine the amount, in mol, of calcium carbonate in the sample of the eggshell
,
(0) Calculate the mass and the percentage by mass of caldur carbonate in the eggshell
sample
(9) beduce one assumption made in arriving at the percentage of caldur carbonate in the
eggshell sample.
Explanation:
please see images... hope this helps!
How many electrons are unpaired in the orbitals of carbon?
Answer:
2 unpaired electrons
Explanation:
Carbon's bonding state electron configuration is 1s2 2s1 2s1 2p1 2p1. So, there are 4 unpaired electrons in the orbitals of carbon in bonding state.
hope this helps
Which of the following atoms has the least metallic character?
Answer:
The least metallic or most non-metallic element is fluorine.
Explanation:
hope this helps
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Which of the following could cause a change in state from a liquid to a solid?
Increases the pressure l
_____________________
Removing Energy l
2 Select the correct answer. Which is a form of kinetic energy? OA gravitational energy OB. chemical energy OC. electrical energy D. sound energy
Answer:
sound
Explanation:
Kinetic energy = 1/2 m v^2
KE requires movement
How are owls compared to wolfs?
Answer:
They are both very aggressive animals! And amazing hunters at night!
Explanation:
I hope this helps! :)
Answer:
Owl and wolfs dodnt really have simuarities tbh lol, but they are both fercious animals :)
Explanation:
State the second law of thermodynamics in words and express it mathematically defining all terms. (6 marks)
The second law of thermodynamics states, in part, that "every spontaneous activity in any isolated system always leads in a rise in the entropy of that system." Because the universe is an isolated system, this assertion may be represented mathematically as follows: (1.6-2)
The largest mass of silver chloride precipitated is when excess silver ions are added to
A 25.0cm3 of 0.80M hydrochloric acid.
B 30.0cm3 of 0.30M iron(III) chloride solution.
C 50.0cm3 of 0.20M magnesium chloride solution.
D 50.0cm3 of 0.50M sodium chloride solution.
answer is B but have no clue why!
The largest mass silver chloride is precipitated when excess silver ions are added to 30.0cm3 of 0.30M iron(III) chloride solution.
What is a precipitation reaction?A precipitation reaction is a reaction in which an insoluble substance is obtained when two solutions are mixed together as a result of one of the products of the reaction being insoluble in water.
Silver chloride is an insoluble salt that will precipitate when a single silver salt is added to a soluble chloride salt.
In the above, the largest mass silver chloride is precipitated when excess silver ions are added to 30.0cm3 of 0.30M iron(III) chloride solution since iron (iii) chloride is a weak electrolyte.
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Calculate the quantity of energy produced per gram of U-235 (atomic mass = 235.043922 amu ) for the neutron-induced fission of U-235 to form Xe-144 (atomic mass = 143.9385 amu ) and Sr-90 (atomic mass = 89.907738 amu ).
Fission is the formation of two smaller atoms by the collision of the neutrons. The quantity of energy produced per gram is 7.23 × 10¹⁰ J/g.
What is nuclear fission?Nuclear fission is a process in which the neutron collides with the atom and results in the formation of two isotopes.
The nuclear fission reaction is shown as,
[tex]\rm ^{235}_{92}U + ^{1}_{0} n \rightarrow ^{144}_{54} Xe + ^{90}_{38}Sr + 2^{1}_{0}n[/tex]
Energy in joules is calculated by the Einstein's formula as:
[tex]\begin{aligned} \rm E &= \rm mc^{2}\\\\&= 3.139 \times 10^{-28} \times (2.99 \times 10^{8})^{2}\\\\&= 2.82 \times 10^{-11}\;\rm J\end{aligned}[/tex]
Energy per gram is calculated as:
[tex]\begin{aligned}& =\dfrac{ (2.82 \times 10^{-11})(6.022 \times 10^{26})}{235.043}\\\\&= 0.0722 \times 10^{12}\\\\&= 7.23 \times 10^{10} \;\rm J/g\end{aligned}[/tex]
Therefore, the energy per gram of the fission is [tex]7.23 \times 10^{10} \;\rm J/g.[/tex]
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At what temperature does the motion of the particles of an ideal gas cease?
Answer:The temperature at which the motion of particles theoretically ceases is 00A or absolute zero, Absolute 00 is the definition of 00 on the Kelvin and Rankine temperature scales.
Explanation:
An investigator makes a graph of the loudness of a vibrating string over time:
The investigator can reach which conclusion about the different numbered times?
A
The string vibrated more intensely at time 3 than at time 2.
B
The string vibrated more intensely at time 2 than at time 3.
C
The string vibrated more intensely at time 4 than at time 2.
D
The string vibrated more intensely at time 1 than at time 2.
Answer:
A because time 3 is the highest peak than time 1-4 (-3)
Answer:
A. The string vibrated more intensely at time 3 than at time 2.
Explanation:
What is the pH of a 1 x 10^-5 M [OH-] solution
a. 3
b. 9
c. 5
d. 11
Answer:
I think this will help you
Explanation:
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE
A thermometer at room temperature is placed in cup of hot tea. What happens to the molecular kinetic energy of the molecules in the thermometer?
stays the same
•
decreases
increases
Answer:
increases
Explanation:
The energy increases (temp increases)....the molecules become further apart and the liquid expands up the graduated scale of the thermometer to show temp
Water exists as a liquid in what temperature range?
Answer: between 0 degrees Celsius and 100 degrees celsius
How many J of energy would you need in order to heat 252 grams of
iron from 305 K to 445 K?
S(Fe) = 0.450 J/g*K
Answer:
16128 J
Explanation:
Data:
m (mass) = 252 gTi (Temperature initial) = 305 KTf (Temperature final) = 445 Kc (specific heat) 0.450 J/g*KWanted:
q (heat) = ? JSolution:
q = mCΔTq = (256 g)(0.450 J/g*K) (445 K - 305 K)q = (256 g)(0.450 J/g*K) (140 K)q = 16128 JNote:
The answer is not in a correct significant figure. So, make sure you have a correct significant figure.
What is the coordination number of the chromium ion in the complex ion [Cr(NH₃)₄Cl₂]⁺?
Answer:
6
Explanation:
Count the number of species that are bonded to chromium in this complex ion. There are four ammonia molecules and two chlorine atoms bonded to chromium. This yields a coordination number of 6.
The co-ordination number of chromium ion in complex [Cr(NH₃)₄Cl₂][tex]^+[/tex] is six as there are four ammonia molecules and 2 chlorine molecules bonded to chromium which gives total co-ordination number of 6.
What are ions?An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.
Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.
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2. What causes a current in an electric circuit?
conductor
voltage
ampere
electric charge
Answer:
electric charge
Explanation:
Determine the rate of a reaction that follows the rate law: rate = k[A]^m[B]^n, where k = 1.5
If 23.5 g of ammonia (NH3) is dissolved in 1.0 L of solution, what is the molarity?
Answer:
1.38 M
Explanation:
Need to use the Molarity equation M=n/L
23.5g/ 17.031g/mol NH3 = 1.38 moles
1.38 moles/ 1.0 L = 1.38 M
(d) What is the mass percentage of water in CdCl2.4H2O?
The mass percentage of water (H₂O) in cadmium chloride tetra hydratesolution is equal to the 28.2%.
How do we calculate mass percentage?Mass percentage of any substabce present in any solution will be calculated as:
Mass percent = (Mass of substance/Total mass of solution)×100%
According to the question,
Mass of water (H₂O) = 18.02 g/mol
Mass of solvent (CdCl₂.4H₂O) = 183.32 + 4(18.02) = 255.4 g/mol
On putting values, we get
Mass percent = (18.02 / 255.4) × 100% = 28.2%
Hence mass percent of water is 28.2%.
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- 5. Describe the general trend in atomic radil across a row of the periodic table.
Answer:
Across a row, atomic radii decreases.
Explanation:
It decreases because nuclear charge increases across a row, electrons are added to the same shell and shielding remains constant. Therefore the outer electrons are more attracted to the nucleus making the atom smaller.
Molarity by dilution. Show steps
Answer:
[tex]V_2 = 0.0167L = 16.7 mL[/tex]
Explanation:
[tex]c_1 V_1 = c_2 V_2\\2.0 M \cdot 0.100L = 12M \cdot V_2\\V_2 = \frac{2.0M \cdot 0.100L}{12M} = 0.0167L = 16.7 mL[/tex]
What is the formal charge of F in CF4?
Answer:
zero
Explanation:
Answer:
Zero.
Explanation:
The overall formal charge in CF4 is zero.
Which type of precipitation is shown in the diagram below? How does this precipitation form?
Answer:
precipitation means water droplets may grow as a result of additional condensation of water vapor when the particles collide. If enough collisions occur to produce a droplet with a fall velocity which exceeds the cloud updraft speed, then it will fall out of the cloud as precipitation.
Explanation:
i knew this alr
Under business as usual (the starting scenario of DOCs), which of the following are the three current biggest sources of electrical energy? Select 3.
Question 2 options:
Nuclear Power
Hydroelectric
Natural Gas
Coal Power
Answer:
nuclear power, natrual gas , coal power
Explanation:
i took the quiz.
What causes radiation heating?
A. Heat transfer through electromagnetic waves
B. Heat transfer through moving gases or liquids
C. Heat transfer through differences in temperatures
D. Heat transfer through contact between molecules
Answer:
No. A
Explanation:
cause due to the friction between both molecules heat is produced rapidly.
The answer is A) Heat transfer through electromagnetic waves.
Cause due to the friction between both molecules heat is produced rapidly.
What radiation does do to a person?Radiation can harm the DNA in our cells. Excessive doses of radiation can motivate Acute Radiation Syndrome (ARS) or Cutaneous Radiation accidents (CRI). High doses of radiation could also cause most cancers later in life.
Radiation is a mutagen, which finally can lead to cancer. Radiation can either kill cells or harm the DNA within them, which damages their capacity to reproduce and might in the end cause cancer. whilst radiation is a gift, excessive electricity debris bypasses your body.
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