Answer:
C
Explanation:
In the presence of a catalyst, both the forward and reverse reaction rates will speed up equally. :)
Please help me with this homework
A compound found in the athletes urine had a percent composition of 80.8% carbon, 8.97% hydrogen and 10.3% oxygen. What is the Empirical formula of the compound? What is the molecular formula of the compound if the molar mass of the compound is 312g/mol?
Answer:
C21H2802
Explanation:
C=12g/mol
H=1g/mol
O=16g/mol
Part (C) of compound-80.18%
(0.8018 x 312)/12=21
Part (H) of compound-8.97%
(0.897 x 312)/1=28
Part (O) of compund-10.3%
(0.103 x 312)/16 = 2
Therefore the emp. formula is C12H28O2
Periodic table 50 elements with thier valancies
Answer:
The first 50 elements along with their valences are given below :
1. Hydrogen = 1
2. Helium = 0
3. Lithium = 1
4. Beryllium = 2
5. Boron = 3
6. Carbon = 4
7. Nitrogen = 3
8. Oxygen = 2
9. Fluorine = 1
10. Neon = 0
11. Sodium = 1
12. Magnesium = 2
13. Aluminium = 3
14. Silicon = 4
15. Phosphorus = 3
16. Sulphur = 2
17. Chlorine = 1
18. Argon = 0
19. Potassium = 1
20. Calcium = 2
21. Scandiun = 3
22. Titanium = 3
23. Vanadium = 4
24. Chromium = 3
25. Manganese = 4
26. Iron = 2
27. Cobalt = 2
28. Nickel = 2
29. Copper = 2
30. Zinc = 2
31. Gallium = 3
32. Germanium = 4
33. Arsenic = 3
34. Selenium = 2
35. Bromine = 1
36. Krypton = 0
37. Rubidium = 1
38. Strontium = 2
39. Yttrium = 3
40. Zirconium = 4
41. Niobium = 3
42. Molybdenum = 3
43. Technetium = 7
44. Ruthenium = 4
45. Rhodium = 3
46. Palladium = 4
47. Sliver = 1
48. Cadmium = 2
49. Indium = 3
50. Tin = 4
Note :
An element like Iron, copper can have more than one valencies.
Answer:
50 elements chemical eq, atomic number, atomic mass, no.of electrons, no.of protons, no.of neutrons, electronic configuration and valancies are given in the above attachment
Explanation:
Hope it helps you
Gas density can be calculated by dividing the mass of gas by its volume. If you took a balloon of gas and then warmed the balloon in a sunny window, what can now be said about the density of the gas in the balloon? Gas density can be calculated by dividing the mass of gas by its volume. If you took a balloon of gas and then warmed the balloon in a sunny window, what can now be said about the density of the gas in the balloon? The gas density will decrease. The gas density will remain the same. The gas density will increase. The density of gases is independent of temperature. none of the above
Answer: The density will decrease
Explanation: Heating a substance causes molecules to speed up and spread slightly further apart, occupying a larger volume that results in a decrease in density.
Adiabatic process is a process in which _ is constant (a) temperature (b)volume (c)pressure (d) heat
Answer: Adiabatic process is a process in which heat is constant
Explanation:
The processes in which temperature remains constant is called isothermal process.
The process in which Volume remains constant is called isochoric process.
The process in which pressure remains constant is called isobaric process.
The process in which no heat is gained or lost by the system, Hence heat remains constant is called as adiabatic process.
Thus option d) heat is correct
What is the best synonym for "alloy?"
A: nonmetal
B: mineral
C:blend
D:stone
Tyrone mixes some chemicals together. He notices that the mixture gives off heat and is hot to touch. What type of reaction is this?
A. Physical
B. Chemical
C. Polar Bear
D. Solution
What amount of heat is released when the temperature of 450.0 g of a
substance drops by 7.1 °C? Assume that the specific heat = 1.264 J/g.°C
Answer:
[tex]\boxed {\boxed {\sf 4038.48 \ Joules}}[/tex]
Explanation:
Since we are given the mass, specific heat, and change in temperature, we should use this formula for heat:
[tex]q=mc\Delta T[/tex]
The substance's mass is 450.0 grams, the specific heat is 1.264 J/g°C, and the change in temperature is 7.1 °C.
[tex]m= 450.0 \ g \\c= 1.264 \ J/g \textdegree C\\\Delta T= 7.1 \ \textdegree C[/tex]
Substitute the values into the formula.
[tex]q= (450.0 \ g)(1.264 \ J/g \textdegree C)(7.1 \ \textdegree C)[/tex]
Multiply the first 2 values together. The grams will cancel out.
[tex]q= 568.8 \ J/ \textdegree C (7.1 \ \textdegree C)[/tex]
Multiply again. This time, the degrees Celsius cancel out.
[tex]q= 4038.48 \ J[/tex]
4038.48 Joules of heat energy are released.
What is the equilibrium constant for the chemical equation:
1. N2 (g) + 3H2 (g) ↔ 2NH3 (g)
At equilibrium, the concentration of N2 is 2.5 x 10-4 M, the concentration of H2 is 6.4 x 10-3 M, and the concentration of NH3 is 5.3 x 10-2 M.
Write out the equilibrium constant, Keq, and show you work.
2. Mg3P2 (s) ↔ 3Mg+2 (aq) + 2P-3 (aq)
At equilibrium, the concentration of Mg3P2 is 5.5 x 10-6 M, the concentration of magnesium ions is 7.2 x 10-5 M, and the concentration of phosphide ions is 9.8 x 10-8 M.
Write out the equilibrium constant, Keq, and show you work.
Answer:
beaner
Explanation:
Answer:
x= 1 /5 y+ 4 /5
Explanation:
Let's solve for x.
10x−2y=8
Step 1: Add 2y to both sides.
10x−2y+2y=8+2y
10x=2y+8
Step 2: Divide both sides by 10.
10x /10 = 2y+8 /10 x= 1 /5 y+ 4 /5
6. Which two regions of Earth in the illustration are experiencing winter?
N
Sun
Position
A. Northern and Southern Hemispheres at position A
B. Northern Hemisphere at position A and Southern Hemisphere at position B
C. Northern and Southern Hemispheres at position B
D. Northern Hemisphere at position B and Southern Hemisphere at position A
Answer:
B
Explanation:
Organelle X is a -
A.
mitochondrion, which makes energy for the cell.
B.
ribosome, with carries proteins within the cell.
C.
centriole, which helps divide the cell in two.
D
lysosome, which helps digest substances inside the cell.
Answer:
A.
Explanation:
4.6 moles of a gas are at a temperature of 325 K and a volume of 96.8 L, what is the pressure of the gas
Answer:
1.27atm is the pressure of the gas
Explanation:
Using combined gas law, we can find the pressure of a gas with the moles, temperature and volume of the gas. The formula is:
PV = nRT
P = nRT / V
Where P is pressure in atm
n are the moles of the gas: 4.6 moles
R is gas constant: 0.082tamL/molK
T is absolute temperature: 325K
V is volume: 96.8L
Replacing:
P = 4.6mol*0.082atmL/molK*325K / 96.8L
P = 1.27atm is the pressure of the gas
Which ionization process requires the most energy? which ionization process requires the most energy? f(g) → f +(g) + e- o(g) → o +(g) + e- f +(g) → f 2+(g) + e- o +(g) → o 2+(g) + e-?
Guys im going to be going over these with my teacher tomorrow so please help me if u have a little bit of humanity inside you ASAP
Answer:
5. Amplitude.
6. 344.8 meters/second
Explanation:
5. The energy is proportional to the amplitude is all I remember. Sorry :/ Been a long time since I took these classes.
6. Traveling to the wall & back is 200m
100 + 100 = 200m total traveled
The time is 0.58s so, we can use the speed formula to solve [ s = d/t ] where s = speed, d = distance, and t = time.
s = 200/0.58
s = 344.82758
I don’t know if they’ll have you round, but I would say the speed of the sound is 344.8 m/s.
Please answer the question
Answer: c
Explanation:
Why is knowing where volcanoes and earthquakes occur important?
Please help!!!!!
1. How many molecules are there in 24 grams of iron (III) fluoride?
*Urgent*
A balloon has a volume of 31.8 L at a temperature of 46 degrees C. What is the new temperature
of the balloon in degrees C if the volume is changed to 49.2 liters?
Round answers to 0.1 decimals
Answer:
The new volume will be
0.7 L
Explanation:
This is an illustration of Charles' law, some of the time called the temperature-volume law. It expresses that the volume of a gas is straightforwardly corresponding to the Kelvin temperature, while pressing factor and sum are held steady. The condition is V 1 T 1 = V 2 T 2 , where V is volume and T is temperature in Kelvins. Known V 1 = 0.5 L T 1 = 20 ∘ C + 273.15 = 293 K T 2 = 150 ∘ C + 273.15 = 423 K Obscure V 2 Arrangement Revise the condition to confine V 2 . Substitute the known qualities into the condition and address. V 2 = V 1 T 2 T 1 V 2 = ( 0.5 L × 423 K ) 293 K = 0.7 L adjusted to one huge figure
A full moon appears on July 1: On what date is the next full moon likely to appear in the night sky?
А July 15
B July 29
C August 14
D August 28
A full Moon chances roughly every 29.5 days, so it may be possible the next full moon likely to appear in the night sky of Earth on July 29, hence the option B is correct.
The lunar phase during which the Moon is completely lit from Earth's viewpoint is known as the full moon.
When Earth is situated halfway between the Sun and the Moon, this happens. This indicates that the near side of the moon, which faces Earth, is fully illuminated by the sun and appears as a roughly round disc.
A full Moon chances roughly every 29.5 days, so it may be possible the next full moon likely to appear in the night sky on July 29.
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What is the difference between the reaction of CH3COOH with H20 and with OH?
Answer:
Explanation: CH3COOH(aq) + H2O(l) ↔ CH3COO-(aq) + H3O+(aq) acid base ... sulfuric acid can react with either OH- or. H.
what is the mass of an electron?
0 amu
1 amu
2 amu
dependent upon the type of element
PLEASE HELP
Answer:
the answer is 0 amu I hope it helps
Un Hidrocarburo de peso molecuar 42g/mol contiene un 85,7 de carbono, ¿cual es la formula empirica y molecular?
Answer:
1 respuesta. fórmula empírica = CH2
Explanation:
Translatation: 1 Answer. empirical formula = CH2
Cd(s)+2HCI(aq)---- H2(g)+CdCl2(aq). what volume in liters of 0.81m HCI solution would be needed to fully react with 32.71g Cd. answer only please
Answer:
0.718L of 0.81M HCl are required
Explanation:
Based on the reaction:
Cd(s)+2HCI(aq) → H2(g)+CdCl2(aq)
1 mol of Cd reacts with 2 moles of HCl
To solve this question we must, as first, find the moles of Cd. With the moles of Cd we can find the moles of HCl needed to react completely with the Cd. With the moles and the molarity we can find the volume:
Moles Cd -Molar mass: 112.411g/mol-:
32.71g * (1mol / 112.411g) = 0.2910 moles Cd
Moles HCl:
0.2910 moles Cd * (2 moles HCl / 1mol Cd) =
0.5820 moles HCl
Volume:
0.5820 moles HCl * (1L / 0.81moles) =
0.718L of 0.81M HCl are requiredexplain why decomposition uses solar energy
Answer:
Without the sun's energy, biological life would not be able to exist to decompose. Many microbes and fungi do their best work out of direct sunlight.
In an ecosystem, microbes make use of solar energy to decompose dead plant and animals.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different types of ecosystems present.
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The standard molar enthalpy of vaporization for water is 40.79kJ/mol. What mass of steam is required to release 500 kJ of energy upon condensation?
Answer:
220.9g of water are required
Explanation:
The molar enthalpy of vaporization is defined as the heat released when 1 mole of water changes from liquid to gas.
For water, 1 mole releases 40.79kJ. To release 500kJ are necessaries:
500kJ * (1mol / 40.79kJ) = 12.26 moles are necessaries
To convert moles to grams we must use the molar mass (H2O = 18.02g/mol):
12.26 moles * (18.02g / 1 mol) =
220.9g of water are required3.
Which quantity of salt will form an
unsaturated solution in 100 g of water
at 50°C?
(1) 43 g of KCI
(2) 50 g of NH4Cl
(3) 100 g of KNO,
(4) 116 g of NaNO,
Answer:
Option D, 116 g of NaNO3
Explanation:
An unsaturated solution is the one in which the amount of salt dissolved in more than the maximum amount of salt that can be dissolved in it.
At 50 degree Celsius, 37 grams of salt can be dissolved in 100 ml of water. Hence, 116 gram of salt is the correct answer
1. Pressures up to 3000 bar are measured with a dead-weight gauge. The piston diameter is 4 mm. What is the approximate mass in kg of the weights required
Answer:
The approximate mass of the weight required is 348.3 kg
Explanation:
The dimensions of the dead-weight gauge are;
The pressure up to which the dead-weight gauge measures, P = 3,000 bar
The diameter of the piston of the dead-weight gauge, D = 4 mm = 0.004 m
The dead-weight gauge pressure formula is given as follows;
Pressure, P = The weight applied, W ÷ The area the weight is applied, A
∴ The weight applied, W = P × A
Where;
P = Pressure
A = The area the weight is applied
W = The weight applied to the piston
The area the weight is applied, A = The area of the piston = π·D²/4
Where;
D = The diameter of the piston
∴ A = π × (0.004 m)²/4
When P = 3,00 bar, and A = π × (0.004 m)²/4, we have;
The weight applied, W = P × A
∴ W = 3,000 × π × (0.004 m)²/4 ≈ 3,769.9118 N
W ≈ 3,769.9118 N
W = m·g
Where;
m = The mass of weight
g = The acceleration due to gravity ≈ 9.81 m/s²
m = W/g
∴ m = 3,769.9118 N/(9.81 m/s²) ≈ 384.3 kg
The approximate mass of the weight required, m = 348.3 kg.
We started by Solving for the force and then the area of the piston, we then applied the formula for force using the constant for acceleration due to gravity and the mass was found to be 384.34 kg
Given Data
Pressure = 3000 bar
Diameter = 4mm
Let us convert bar to N/mm^2
1 bar = 0.1 N/mm^2
3000 bar = x N/mm^2
= 0.1*3000
= 300 N/mm^2
We know that pressure P = Force/Area
Let us find the area of the piston
Area = πd^2/4
Area = 3.142*4^2/4
Area = 3.142*16/4
Area = 50.272/4
Area = 12.568 mm^2
Let us find the force F
F = P*Area
F = 300*12.568
F = 3770.4 Newton
We know that Force = Mg
g = 9.81 m/s^2
Hence, m = F/g
m = 3770.4/9.81
m = 384.34 kg
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A rubber ball contains .570 mL of gas at a pressure of 2.05 atm. What volume will the gas Couoh at 7.47 atm?
Answer:
the volume that the gas occupy at 7.47 atm is 0.1564 liters
Explanation:
The computation of the volume that the gas occupy at 7.47 atm is shown below:
As we know that
P1V1 = P2V2
Now
V2 = P1V1 ÷ P2
= 2.05 atm × 0.570 liters ÷ 7.47 atm
= 0.1564 liters
Hence, the volume that the gas occupy at 7.47 atm is 0.1564 liters
So the same would be considered and relevant
How many molecules are in 6.20 moles of CaCO3?
1 mole is equal to 1 moles CaCO3, or 100.0869 grams.
What is mole?A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created.
The mole is a SI unit that is used to quantify any quantity of a substance. The word "mole" is shortened to "mol".
A mole consists of precisely 6.022140761023 particles. The "particles" could be anything, from tiny things like electrons or atoms to enormous things like stars or elephants.
Therefore, 1 mole is equal to 1 moles CaCO3, or 100.0869 grams.
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Why do North and South Pole have different winter times?
The two poles have different location.
North Pole is found in the Western Hemisphere.
The tilt of the Earth towards the Sun changes throughout the year.
North Pole is found in the Northern Hemisphere.
Answer:
Explanation:
Both the Arctic (North Pole) and the Antarctic (South Pole) are cold because they don't get any direct sunlight. The Sun is always low on the horizon, even in the middle of summer. In winter, the Sun is so far below the horizon that it doesn't come up at all for months at a time.
Answer:
The tilt of the Earth towards the Sun changes throughout the year.
Explanation