Answer:
194 mm Hg or 193.8mm Hg
Explanation:
273+18=291 K
2.35g /44
=0.0534 moles
P=0.0534 mol×0.082×29 / 5L
=0.2548 atm
0.255 × 760
=193.8 mmHg
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
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
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.
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 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!! :)
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
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.
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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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 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
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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Which term is used to describe all the habitats around the world?
Ecosystem diversity
Genetic diversity
Natural selection
Species diversity
Answer:
ecosystem diversity
Explanation:
hope this helped
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:
1)Substance A melts at 2300 °c, and it doesn’t conduct electricity even when molten and doesn't dissolve in water. What is the structure and bonding of this?
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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Which factors affect heat transfer between a warm and a cool substance?
the time it took to heat the substance, the area of contact, and the specific heats of the substances
O the amount of time of contact, the area of contact, and the specific heats of the substances
O the time it took to heat the substance, the area of the substances, and the specific heats of the substa
O the amount of time of contact, the area of the substances, and the specific heats of the substances
The amount of time of contact, the area of contact, and the specific heats of the substances. Hence, option A is correct.
What are specific heats?The heat in calories is required to raise the temperature of one gram of a substance one degree Celsius.
Factors that affect the rate of heat flow include the conductivity of the material, the temperature difference across the material, the thickness of the material, and the area of the material.
Different materials have greater or lesser resistance to heat transfer, making them better insulators or better conductors.
The amount of time of contact, the area of contact, and the specific heats of the substances.
Hence, option A is correct.
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Answer: The answer is C and D
B: If a substance undergoes a physical change, then it will retain most of its original properties because no new substance is formed.
C: If a substance undergoes a chemical change, then it will not retain its original properties because a new substance is formed.
Explanation: I took the test on edg
Given the unbalanced equation which represents aluminum metals reacting with an acid:
Al + H+ → Al+3 + H₂
What is the total number of moles of electrons lost by 1 mole of aluminium?
There are three number of electrons lost by 1 mole of aluminium because aluminum has +3 charge on it.
What is cation?When an atom loses electron, positive charge appears on the atom this is called cation. In this reaction we can see that aluminium has +3 charge which means that it loses 3 electrons.
So we can conclude that There are three number of electrons lost by 1 mole of aluminium because aluminum has +3 charge on it.
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Which statement is correct abound chemical bonding in BF3 molecule O The molecule is not stable and hardly exist since the number of valence electrons around a central atom in a molecule are less than 8 O The molecule is stable and can exist even though the number of valence electrons around central atom in the molecule are less than 8 The molecule is not stable and hardly exist since the number of valence electrons around an atom in a molecule are more than 8 and covalent bonding is not possible None of the above is correct
The molecule is stable and can exist even though the number of valence electrons around central atom in the molecule are less than 8.
Is BF3 molecule stable or not?BF3 molecule is a stable molecule because all the electrons present in the outermost shell of boron are covalently bonded with fluorine. Boron in BF3, three bonds is the maximum possible because boron only has 3 electrons to share.
So we can conclude that the molecule is stable and can exist even though the number of valence electrons around central atom in the molecule are less than 8.
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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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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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“Work smarter not harder”
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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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.
Using the information in the table, calculate the number of formula units in a 62.2 g sample of aluminum sulfide (Al2S3)
A 62.2 g sample of aluminum sulfide has 2.49 * 10²³ formula units.
What is a mole ?
A mole is defined as 6.022 * 10²³ of atoms , molecules , ions or others.
It is given in the question to find the number of formula units in 62.2 g sample of Aluminum Sulfide.
To determine no. of formula units , No. of mole needs to be determined
Molecular Weight of Aluminum Sulfide is 150.158 gm
150.158 g of Aluminum Sulfide makes 1 mole
62.2 g will make 62.2 * 1 / 150.158 = 0.414 moles
1 mole = 6.022 * 10²³ formula units.
0.414 moles = 0.414 * 6.022 * 10²³
= 2.49 * 10²³ formula units.
Therefore , a 62.2 g sample of aluminum sulfide has 2.49 * 10²³ formula units.
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Part E
State your conclusion in the form of a theorem, and then prove the theorem using a two-column proof. When
you write the proof, refer to the diagram you created in part A. It will be helpful to use point labels to state
what is given and what you have to prove and to use those labels throughout the proof.
As part of the proof, you'll have to construct a line segment connecting the top intersection point on one of
the transversals with the lowest intersection point of the other transversal, thus forming two triangles. Take a
screenshot of the construction, save it, and insert the image in the space below before you begin your written
proof.
The midpoint theorem states that there is a parallel to the line that joins two sides of a triangle on the third side.
What is the evidence of the midpoint theorem?In a given triangle, if there are different sides to a triangle, then the midpoint is parallel to the third side from two sides of the same triangle.
For example:
If E and D are the midpoints of the sides AC and AB.
Then the line DE is said to be parallel to the side BC because the side DE is half of the side BC; i.e. DE = (1/2 * BC).
Hence, we can see that your question is incomplete, so a general overview is given to you about the midpoint theorem and how it is used.
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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:
3) The following reaction produces chlorine molecules:
Energy + HCl (g) + CINO3 (8) Cl₂ (8) + HNO3 (8)
a) Describe 4 ways you could increase the concentration of chlorine molecules.
b) How would cooling shift the equilibrium of this reaction?
The 4 ways to increase the concentration of chlorine molecules is listed below and the reaction will go into reverse if cooled.
What is Le Châtelier’s principle ?
Le Châtelier's principle states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change to reestablish an equilibrium.
Energy + HCl (g) + ClNO₃ ⇄ Cl₂ + HNO₃
a. So in this reaction when at equilibrium , To increase the concentration of Chlorine molecules
1. An increase in Temperature will favour the formation of Chlorine molecules.
2. Decrease in concentration of Chlorine , or partial removal of Chlorine will result the equation to go in forward direction.
3.An Increase in the concentration of HCl will favour formation of Chlorine molecules.
4.An Increase in the concentration of CINO₃ will also favour formation of Chlorine molecules.
b. The cooling would shift the reaction into backward direction as it is an endothermic reaction in forward state.
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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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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]
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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