Answer: The energy of the products exceeds the activation energy threshold.
Explanation:
In the reverse reaction, the reactants of the forward reaction are now the products of the reverse reaction and vice versa.
This means that normally since you would need the energy of the reactants of the forward reaction to exceed the activation energy threshold, in the reverse reaction, the energy of the products would need to exceed the activation energy threshold.
with strong heating calcium carbonate undergoes thermal decomposition how many mole of CaCO3 are there in 50g of calcium carbonate
Answer:
a)CaCO 3→CaO+CO 2CaCO3→CaO+CO2
b) Moles of CaCO3=4.37moles
c) I) Mass of calcium oxide =28g
ii)Mass of carbon dioxide=16.7g
iii)Volume=203cm3
Question 12
How many moles of aluminum phosphate are produced when 6.8 moles of aluminum nitrate
reacts?
A dodecahedron must have 12 faces
Of these 12 faces, two must be the top & base.
So there shall be 10 faces on the lateral surface.
Hence there shall be 5 on one half & 5 on the other half.
To have 5 faces on the base of a regular polygon, the base must have 5 sides.
So it must be a regular pentagon.
The faces of a regular dodecahedron are regular pentagons.
Option C) is the right answer.
An image is attached for your reference.
Explanation:
What is the mass of butane gas, C4H10, that can be held in a 3.00 l container at STP?
The mass of butane gas at the given volume and Standard temperature and pressure is 0.0022g.
What is Ideal Gas Law?The Ideal gas law or general gas equation emphasizes on the state or behavior of a hypothetical ideal gas. It states that "the pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature.
It is expressed as;
PV = nRT
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )
Given the data in the question;
Volume of the gas V = 3LAt STP; P = 1.0atm, T = 273.15KAmount of gas n = ?PV = nRT
n = PV / RT
n = ( 1.0atm × 3.00L ) / ( 0.08206 Latm/molK × 273.15K )
n = 3.00Latm / 22.41 Latm/mol
n = 0.13mol
Now, since Molar mass of brutane gas is 58.12 g/mol.
Mass = n × Molar mass
Mass = 0.13mol × 58.12 g/mol
Mass = 0.0022g
Therefore, the mass of butane gas at the given volume and Standard temperature and pressure is 0.0022g.
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To determine the molar mass of a certain protein, 2.00×10-3 g of it was dissolved in enough water to
make 1.00 mL of solution. The osmotic pressure of this solution was found to be 2.24 torr at 25.0 o
C.
Calculate the molar mass of the protein.
The molar mass of the protein from the calculation is 1667 g/mol.
What is osmotic pressure?The osmotic pressure can be determined using the formula;
π=icRT
i = Van't Hoff factor = 1
c = concentration = ?
R = gas constant = 0.082 atmLK-1mol-1
T = temperature = 298 K
π= 2.24 torr or 0.029 atm
Now;
0.029 = 1 * c * 0.082 * 298
c = 0.029/1 * 0.082 * 298
c = 0.0012 M
Now;
2.00×10-3 g/MM = 0.0012 M * 1.00/1000L
MM = 2.00×10-3 g/0.0012 M * 1.00/1000L
MM = 1667 g/mol
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How many moles of H₂O are equivalent to 97.3 grams of H₂O? (H = 1.008 g/mol, O = 16.00 g/mol)
Answer:
5.40
Explanation:
you set up the equation with the given value first which is 97.3grams, and grams also goes on the bottom of the equation since the grams have to cancel out to make a mol. calculate the grams of H20 which is 18.016, then put it on the bottom of the equation, then put 1 mol on top.
97.3g x 1mol/18.016
Answer:
5.4 moles
Explanation:
H2 O mole weight 1.008 * 2 + 16 = 18.016 gm/mole
97.3 gm / 18.016 gm/mole = 5.4 moles
Which of the following is not one of the four things that all organisms need to survive?
A. water
B. air
C. a source of energy
D. the ability to move
Answer:
b
Explanation:
this is because all organisims need water, c is out of the question because no energy is needed, d is out because it is needed for fighting against predators
differentiate between ideal and non - ideal solutions.
[tex] \\ [/tex]
ty! ~
Answer:
Ideal Solution: An ideal solution is a solution where interactions between molecules are identical between all the molecules in the solution. Non ideal Solution: A non ideal solution is a solution that has differences in the interactions between molecules of different components in the solution.
Explanation:
Answer:
Ideal solutions obey Raoult's law over entire range of concentrations. Nonideal solutions do not obey Raoult's law over the entire range of concentrations. 2. The vapour pressure of ideal solution always lies between vapour pressures of pure components.
lodine-131 is a radioactive isotope with a half-life of 8 days. How many grams of a 50 g sample will be left after 48 days?
Answer:
0.805 or 0.781 depending on the method used.
Explanation:
Data provided
half life ie t1/2= 8days.
No= 50g
t=48days
Nt=?
Method 1
Formula: Nt= No(1/2)^n
where n= number of half lives.
= t/t1/2 = 48/8
=6.
thus Nt= 50(1/2)^6= 0.781
Method 2
Formula: Nt= Noe^-(lambda)t
where lambda= decay constant
= ln2/ t1/2= ln2/ 8 = 0.086.
thus Nt= 50e^-(0.086×48)= 0.805.
how many oxygen molecules make up ozone
The mass of ethylene glycol (molar mass 62.1 g / mol), the main component of the antifreeze, must be added to 10.0 L of water to obtain a solidified solution at -23 ° C. Assume a water density of 1 g / mL.
[tex]\huge\tt{SOLUTION:}[/tex]
━┈─────────────────────┈━
First we find out the freezing point:→(-23.0)-(0.0_
→-23.0 degrees C
Calculate target Colligative Molarity:→ -23=1.86 * Cm
→ 12.37= Cm.
→i* molality
→i= 1
→12.37= 1*m
→12.37= m
molality= moles of solute(C2H6O2)/kg of solvent water12.37m= moles C2H6O2/ 10.0kg water
123.7= moles of C2H6O2
123.7moles C2H6O2 * 62.26g C2H6O2
= 7701.56 g of C2H6O2━┈─────────────────────┈━
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Please help!
Given the equation representing a reaction
Which statement explains the energy term in this reaction?
Answer: 3. Mass is lost due to the conversion of mass to energy.
To calculate thedensity of an object,you would ?
To calculate the density of an object, you would need to know the mass and volume of the object.
What is density?The density of an object is the ratio of the mass of the object to that of its volume.
In other words, density = mass/volume.
Thus, in order to calculate the density of an object, both its mass and its volume must be known or given.
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convert from grams to moles for 36g CO2
Answer:
0.82 moles CO₂
Explanation:
To convert from grams to moles, you need to find the molar mass of CO₂. This conversion is a ratio stating the amount of grams CO₂ per 1 mole. The molar mass is calculated using the molar mass of each element (in CO₂) from the periodic table.
Molar Mass (Carbon): 12.011 g/mol
Molar Mass (Oxygen): 15.998 g/mol
Molar Mass (CO₂): 12.011 g/mol + 2(15.998 g/mol)
Molar Mass (CO₂): 44.007 g/mol
36 grams CO₂ 1 mole
---------------------- x -------------------------- = 0.82 moles CO₂
44.007 grams
Complete the sentence using ide, ate or Ic. To determine the name of an anion, you take the name of its element and replace the end with
To determine the name of an anion, you take the name of its element and replace the end with "ide".
What is an anion?An anion in chemistry is a negatively charged ion.
Anions are usually formed when a non-metallic atom gains electron(s).
An anion is usually named by taking the elemental name, removing the ending, and adding “ide.
Examples of anions are as follows:
fluoride (F-)Chloride (Cl-)Iodide (I-)Learn more about anions at: https://brainly.com/question/15578817
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what is chemistry
please help ASAP
Answer: Chemistry is the study of matter and the changes it undergoes.
An example of chemistry being used in the real world is how an ECG works. Chemistry is also sometimes considered the "central science". I hope this answer helped!! :)
Determine the number of valence electrons for sodium through the use of this table.
Na =
Answer:
Sodium has one valence electron. Valence electrons are electrons found in the outermost shell of an atom. The shell number representing the valence shell will differ depending on the atom in question. For sodium, which is in the 3rd row of the periodic table, the valence electrons will be found in the 3rd shell.
How many moles are there in 42.2g of Cu₂SO4?
Answer:
0.264moles
Explanation:
number of moles= given mass/molar mass.
Molar mass of Cu2SO4= 63.5+32+4(16)=159.5
moles(n)=42.2/159.5= 0.264moles
An atom of an element is shown by the model.
How is the model useful
Answer:
I believe it is useful as it shows how electrons are distributed in the shells (energy levels) of an iron atom. An atom is the smallest particle of an element that can take part in a chemical reaction. It contains the nucleus and the shells (energy levels). the nucleus contains protons and neutrons while the shells contain electrons.
Explanation:
if the formula was X203 what is the charge of X
Answer:
Formula-Q = W /V
Explanation:
*hope it's help*
Answer:
[tex]3+[/tex]
Explanation:
[tex]\text{X}_2\text{O}_3 \leftrightharpoons 2\text{X}^{3+}+3\text{O}^{2-}[/tex]
Chris noticed a high-pressure system in the weather forecast for Monday
and Tuesday. Which type of weather conditions are most likely for those
two days?
clear and sunny
cold and stormy
cloudy and rainy
D. warm and stormy
Answer:
A. Clear and Sunny
Explanation:
The answer would be A. Clear and Sunny. A high pressure system occurs where the air mass above the Earth is denser than in surrounding areas, and therefore exerts a higher force or pressure. They usually happen with li9ght winds. Using process of elimination, it could not be D. Warm and Stormy, C. Cloudy and Rainy, or B. Cold and Stormy because all have wet climates.
Differences between practical work inside a laboratory and outside a laboratory
The practical work inside the lab includes lab equipments, chemicals, and the practical outside a laboratory is more about conservation of nature and practicals include natural things in their living areas.
What are lab practicals?
Practicals are set up stations with lab equipments and chemicals and where students learn practical of the theoretical statements.
The exams of practicals are done to test the leaning of chemistry of the students.
Thus, the practical work inside the lab includes lab equipments, chemicals, and the practical outside a laboratory is more about conservation of nature and practicals include natural things in their living areas.
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Two friends decide to start selling their drone camera aerial footage. Which economic question have they answered?
For whom to produce?
How much to produce?
How to produce?
What to produce?
Answer:
D. What to produce?
Explanation:
what type of solution forms when 25g of NaCI are dissolved in 100g of water at 30 degrees c
An unsaturated solution is formed when 25g of NaCI are dissolved in 100g of water at 30 degrees Celsius.
What is an unsaturated solution?A solution is formed as a result of the dissolution of a solute in a solvent.
However, based on the capacity of the solvent to take in more solute, a solution can be of three types namely;
Unsaturated solutionSaturated solutionSupersaturated solutionAn unsaturated solution is a solution whose solvent can dissolve more solute at a particular temperature.
According to this question, 25g of NaCI are dissolved in 100g of water at 30°C, hence, the solvent can take in more solute at 30°C.
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A 700 mL sample of nitrogen is heated from 37 °C to 77 °C at constant pressure. What is the final volume? a. 790 L b. 790 ml c. 970 ml d. 970 L
The final volume of the nitrogen sample would be 790 mL
Charle's LawAccording to Charles, at constant pressure, the volume of a gas is directly proportional to its temperature.
Mathematically: v1/t1 = v2/t2, where v1 and v2 = initial and final volume, and t1 and t2 = initial and final temperature.
In this case, t1 = 37 °C or 310 K, t2 = 77 °C or 350 K, v1 = 700 mL
Thus: v2 = v1 x t2/t1 = 700 x 350/310 = 790 mL
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Why sunlight is an essential source of life sustenance on Earth ?
Answer:
The sun is important to Earth because it helps regulate the climate, is the main source of energy for producers in the ecosystems and it keeps the oceans from freezing, along with providing light. If just one of these factors changed dramatically, it would impact all life on Earth. Without the sun, the planet’s oceans would freeze, temperatures would drop and all life would die off without light or food.
The sun is important to every single aspect of life on the planet. Human life could not exist without it because it would cause all of the water and food sources to cease to exist. The sun is in no danger of disappearing any time soon. Scientists estimate the sun has at least another 5 billion years before it turns into a red giant and swallows up Mercury and Venus. It will also destroy all life on Earth because it will be close to the planet once that change occurs. The temperature of the sun will also increase tenfold from 18 million to 180 million degrees Fahrenheit. The increase in the sun’s size when it finally begins to change will be due to the heat increase causing expansion.
Without the sun, we would no energy to live, no plants to eat, no trees to give us oxygen or animals to roam. We would not have gravity to keep the earth in orbit. Without the sun, the earth would be dark and cold and life would quickly disappear.
Carbon-12 and carbon-13 are isotopes of carbon. Which of the following statements is correct?
They both have seven protons in the nucleus.
They both have the same mass number.
They both have seven neutrons in the nucleus.
They both have the same atomic number.
The last statement is correct
They both have seven protons in the nucleus.
it's wrong because they have six protons in the nuclear
They both have the same mass number.
it's wrong because Carbon-12 has mass number 12 but Carbon-13 has mass number 13
They both have seven neutrons in the nucleus.
it's wrong because Carbon-12 has six in the nucleus but Carbon-13 has seven in the nucleus
They both have the same atomic number.
It's true. They have the atomic number - 6
Answer:
D. They both have the same atomic number.
Explanation:
ed22
Which two nuclides are isotopes of the same element
Answer:
1940K and 1939K Isotopes are two forms of the same element that have different numbers of neutrons in the nucleus. This means same symbol, and same atomic number (subscript), but different mass number (superscript).
What does a negative AH for a molecule mean?
A. Energy was released when the molecule was formed from its
elements.
B. Energy was added when the molecule was formed from its
elements.
C. Energy was added when the molecule changed phases.
D. Energy was released when the molecule went through a phase
change.
A negative enthalpy (ΔH)for a molecule means energy was released when the molecule went through a phase change.
What is change in enthalpy (ΔH)?The enthalpy change of a reaction is the amount of heat absorbed or released as the reaction takes place.
Also, the amount of energy required to change the phase of a material is known as the enthalpy,
A negative enthalpy entails the amount of energy released during an exothermic reaction.
Thus, a negative enthalpy (ΔH)for a molecule means energy was released when the molecule went through a phase change.
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0.0010 M NaOH calculate the pH of this solution
See below~
[tex] [OH^{-}] = 0.001 \\ = 10^{-3} M \Longrightarrow pOH = 3 \\ pH + pOH = 14 \Longrightarrow pH = 14-3 = 11[/tex]
The pH of a 0.0010 M NaOH solution is approximately 11.
To calculate the pH of a solution, you need to determine the concentration of hydrogen ions ([H+]). In the case of a strong base like NaOH, the concentration of hydroxide ions ([OH-]) can be used to calculate the concentration of hydrogen ions.
Given that NaOH is a strong base, it dissociates completely in water to form Na+ and OH- ions. The concentration of hydroxide ions can be assumed to be the same as the concentration of NaOH.
In this case, the concentration of NaOH is given as 0.0010 M.
Since [OH-] = 0.0010 M, we can use the Kw (ionization constant of water) to calculate [H+].
Kw = [H+][OH-] = 1.0 x [tex]10^{-14}[/tex]
[H+] = Kw / [OH-]
[H+] = (1.0 x [tex]10^{-14}[/tex]) / (0.0010)
[H+] = 1.0 x [tex]10^{-11}[/tex]M
To calculate the pH, we use the formula: pH = -log[H+]
pH = -log(1.0 x [tex]10^{-11}[/tex])
pH ≈ 11
Therefore, the pH of a 0.0010 M NaOH solution is approximately 11.
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How many protons,neutrons, and electrons does uranium 238 have
Explanation:
92 protons 92 electrons and 146 neutrons
Answer:
92 protons, 92 electrons, 146 neutrons
Explanation:
U-238 has 92 protons, 92 electrons, 146 neutrons.
The 238 is mass number talking about protons + neutrons. Uranium will always have 92 protons so the rest of the things are neutrons (146). Electrons will always equal protons if the element is neutral (no charge) and since no charge was given the numbers will match