based on the nebular Theory, which of these is a step in the formation of a new planetary system?
A) evaporation of water
B) nuclear fission of gases
C) repulsion of gaseous masses
D) change of gases into liquids
Final answer:
The formation of a new planetary system involves the condensation of solid particles, accretion and collision of planetesimals, and the formation of protoplanets.
Explanation:
The formation of a new planetary system according to the nebular theory involves several steps. One important step is the condensation of solid particles from the solar nebula, which leads to the formation of planetesimals. The planetesimals then continue to accrete and collide with each other, gradually growing in size. This process eventually results in the formation of protoplanets, which are still in the process of forming into fully developed planets. Therefore, the correct answer is C) repulsion of gaseous masses.
Which of the following statements is not true regarding physical properties and changes?
A. Physical changes include evaporating, boiling, and dissolving.
B. Physical changes can change compounds into elements.
C. Physical properties can be observed without any change in the substance's identity.
D. A series of physical changes, such as filtration and heating, can be used to separate substances with different physical properties.
Answer: Option (B) is the correct answer.
Explanation:
Physical properties and changes are defined as the property or changes that does not cause any change in the chemical composition of a substance.
For example, cutting a piece of sodium with knife is a physical change.
Whereas boiling point, density, melting point etc are all physical changes.
On the other hand, changes that bring change in chemical composition of a substance are known as chemical changes.
For example, reactivity, toxicity etc are all chemical changes.
Hence, we can conclude that the statement physical changes can change compounds into elements, is not true regarding physical properties and changes.
Wine goes bad soon after opening because the ethanol ch3ch2oh in it reacts with oxygen gas o2 from the air to form water h2o and acetic acid ch3cooh , the main ingredient of vinegar. what mass of ethanol is consumed by the reaction of 3.84g of oxygen gas? be sure your answer has the correct number of significant digits.
How tall would a stack of 1000 pennies in centimeters
Final answer:
To find the height of a stack of 1000 pennies, multiply the thickness of one penny (1.52mm) by 1000, resulting in a stack 1520mm tall, which is 152 centimeters.
Explanation:
The question concerns how tall a stack of 1000 pennies would be in centimeters. To answer this, we must know the thickness of one penny. If we assume the thickness of a single penny is approximately 1.52mm (0.0598 inches), we can calculate the height of 1000 pennies by multiplying the thickness of one penny by the number of pennies in the stack. Since there are 10 millimeters in 1 centimeter, we'll need to convert millimeters to centimeters.
Here is the calculation:
Thickness of one penny = 1.52mmHeight of 1000 pennies = 1000 x 1.52mm = 1520mmHeight in centimeters = 1520mm / 10 = 152cmWhat is the concentration of k+ ions in a 0.045 m k2co3 solution assuming complete dissociation?express the concentration in molarity?
Answer: The concentration of [tex]K^+[/tex] ions in the solution is 0.09 M
Explanation:
We are given:
Concentration of [tex]K_2CO_3[/tex] = 0.045 M
The chemical equation for complete dissociation of potassium carbonate follows:
[tex]K_2CO_3(aq.)\rightarrow 2K^+(aq.)+CO_3^{2-}(aq.)[/tex]
By stoichiometry of the reaction:
1 mole of potassium carbonate produces 2 moles of potassium ions and 1 mole of carbonate ions.
So, the concentration of potassium ions in the given solution = [tex](2\times 0.045M)=0.09M[/tex]
Hence, the concentration of [tex]K^+[/tex] ions in the solution is 0.09 M
Which of the following best predicts the outcome of a fusion reaction involving isotopes of hydrogen?
Two hydrogen isotopes form bonds with each other, absorbing a large amount of energy.
The nuclei of the hydrogen isotopes join together to form a heavier element, and energy is released.
Isotopes of hydrogen absorb electrons, undergo an increase in energy level, and split into fragments.
The nuclei of the hydrogen isotopes split, resulting in smaller fragments and the release of a large amount of energy.
The solubility product for barium sulfate is 1.1 × 10–10. calculate the molar solubility of barium sulfate.
the molar solubility of Barium Sulfate is 1.05 × 10⁻⁵ mol/L.
The correct option is (b).
The solubility product (Ksp) for Barium Sulfate (BaSO₄) is given as 1.1 × 10⁻¹⁰. The solubility product is the equilibrium constant representing the relationship between the concentrations of the ions in the saturated solution:
BaSO₄(s) ⇌ Ba²⁺(aq) + SO₄²⁻(aq)
To calculate the molar solubility (S) for BaSO₄, we need to find the concentration of Ba²⁺ and SO₄²⁻ ions at equilibrium. Since Ksp is given, we can use the definition of the solubility product:
Ksp = [Ba²⁺] × [SO₄²⁻]²
We don't have the individual ion concentrations but can find the total molar solubility (Sₙ) by taking the square root of the solubility product:
Sₙ = √(Ksp) = √(1.1 × 10⁻¹⁰) = 1.05 × 10⁻⁵ mol/L
So, the molar solubility of Barium Sulfate is 1.05 × 10⁻⁵ mol/L.
complete question given below:
The solubility product for barium sulfate is 1.1*10⁻¹⁰. Calculate the molar solubility of barium sulfate.
1) 5.5*10⁻⁸ mol/L
2) 1.05 *10⁻⁵ mol/L
3) 2.1*10⁻⁵ mol/L
4) 1.1*10⁻¹⁰ mol/L
5) 2.2*10⁻¹⁰ mol/L
How many electrons potassium isotope with 19 protons and 22 neutrons?
H2O has a Hvap = 40.7 kJ/mol. What is the quantity of heat that is released when 27.9 g of H2O condenses?
Answer:
Quantity of heat released = -63.1 kJ
Explanation:
Given:
Enthalpy of vaporization of water, ΔHvap = 40.7 kJ/mol
Mass of water, m = 27.9 g
To determine:
The amount of heat (Q) released
Explanation:
The reaction is: H2O(g) ↔ H2O(l)
The amount of heat evolved during condensation which involves a phase transition from vapor to liquid is given as:
[tex]Q = n*\-Delta Hvap[/tex]
n = moles of water
Since this is a condensation process: ΔHcond = -ΔHvap
[tex]Q = \frac{27.9 g}{18 g/mol} * -40.7 kJ/mol = -63.1 kJ[/tex]
Find the no. Of electron involved in the electro deposition of 63.5g of cu from a solution of cuso4
a common greenhouse gas containing only hydrogen and oxygen
Calculate the molarity of a solution containing 0.2 mol nh4br in exactly 200 ml solution
Which pair of elements is most apt to form a molecular compound with each other?
How many n2o4 molecules are contained in 76.3 g n2o4? the molar mass of n2o4 is 92.02 g/mol?
Answer:[tex]4.98\times 10^{23}[/tex] molecules
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{76.3g}{92.02g/mol}=0.83 moles[/tex]
1 mole of [tex]N_2O_4[/tex] contains =[tex]6.023\times 10^{23}[/tex] molecules
0.83 moles of [tex]N_2O_4[/tex] contains =[tex]\frac{6.023\times 10^{23}}{1}\times 0.83=4.98\times 10^{23}[/tex] molecules
Thus total number of molecules in 76.3 g of [tex]N_2O_4[/tex] is [tex]4.98\times 10^{23}[/tex] molecules
Taking into account the definition of molar mass and Avogadro's number, 4.99×10²³ molecules are contained in 76.3 g of N₂O₄.
Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Moles that contain 76.3 g of N₂O₄Being the molar mass of N₂O₄ is 92.02 g/mol, you can apply the following rule of three: If by definition of molar mass 92.02 grams of the compound are contained in 1 mole, 76.3 grams are contained in how many moles?
[tex]amount of moles=\frac{76.3 gramsx1 mole}{92.02 grams}[/tex]
amount of moles= 0.829 moles
Molecules contauned in 0.829 moles of N₂O₄Then you can apply the following rule of three: If by definition of Avogadro's number, 1 mole of the compound contains 6.023×10²³ molecules, 0.829 moles contains how many molecules?
amount of molecules= (6.023×10²³ molecules× 0.829 moles)÷ 1 mole
amount of molecules= 4.99×10²³ molecules
Finally, 4.99×10²³ molecules are contained in 76.3 g of N₂O₄.
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The density of a gas is 1.49 g/l at a temperature of 24 âc and a pressure of 0.787 atm . calculate the molar mass of the gas.
The molar mass of the gas is approximately [tex]47.56 \text{ g/mol}[/tex]
To calculate the molar mass of the gas, we can use the Ideal Gas Law, which is given by:
[tex]\[ PV = nRT \][/tex]
where:
- [tex]\( P \)[/tex] is the pressure of the gas,
- [tex]\( V \)[/tex] is the volume of the gas,
- [tex]\( n \)[/tex] is the number of moles of the gas,
- [tex]\( R \)[/tex] is the ideal gas constant, and
- [tex]\( T \)[/tex] is the temperature of the gas in Kelvin.
First, need to convert the temperature from Celsius to Kelvin:
[tex]\[ T(K) = T(\°C) + 273.15 \] \[ T(K) = 24 + 273.15 = 297.15 K \][/tex]
The density [tex]\( \rho \)[/tex] of the gas is given as 1.49 g/L. The density is the mass [tex]\( m \)[/tex] divided by the volume [tex]\( V \)[/tex]:
[tex]\[ \rho = \frac{m}{V} \][/tex]
express the mass in terms of the molar mass [tex]\( M \)[/tex] and the number of moles [tex]\( n \)[/tex]:
[tex]\[ m = M \cdot n \][/tex]
Substituting this into the density equation gives:
[tex]\[ \rho = \frac{M \cdot n}{V} \][/tex]
Now, can rearrange the Ideal Gas Law to solve for [tex]\( n \)[/tex]:
[tex]\[ n = \frac{PV}{RT} \][/tex]
Substituting this expression for [tex]\( n \)[/tex] into the density equation gives:
[tex]\[ \rho = \frac{M \cdot PV}{RTV} \][/tex]
[tex]\[ \rho = \frac{M \cdot P}{RT} \][/tex]
Now, can solve for the molar mass [tex]\( M \)[/tex]:
[tex]\[ M = \frac{\rho RT}{P} \][/tex]
know that the ideal gas constant [tex]\( R \)[/tex] is 0.0821 L·atm/(mol·K), so we can plug in the values:
[tex]\[ M = \frac{1.49 \text{ g/L} \cdot 0.0821 \text{ L\·atm/(mol\·K)} \cdot 297.15 \text{ K}}{0.787 \text{ atm}} \] \[ M = \frac{1.49 \cdot 0.0821 \cdot 297.15}{0.787} \] \[ M = \frac{37.41}{0.787} \] \[ M \approx 47.56 \text{ g/mol} \][/tex]
Therefore, the molar mass of the gas is approximately 47.56 g/mol.
The two naturally occurring isotopes of copper are copper-63 and copper-65. how many neutrons are in one atom of copper-65? 29 34 36 65
Answer: The number of neutrons in copper-65 are 36.
Explanation:
Atomic number is defined as the number of protons that are present in an atom. It is represented as 'Z'
Z = Atomic number = Number of protons
Atomic mass of an element is defined as the sum of number of neutrons and number of protons that are present in an atom. It is represented as 'A'.
A = Atomic mass = Number of neutrons + Number of protons
For Copper, the atomic number is 29.
We are given:
Atomic mass of copper-65 = 65
Number of neutrons = 65 - 29 = 36
Hence, the number of neutrons in the given isotope of copper are 36.
Which statement correctly describes an electrode in a voltaic cell of copper and hydrogen?
A. Copper atoms become copper ions at the anode because the SRP is more positive.
B. Hydrogen ions become diatomic hydrogen at the cathode because hydrogen is always reduced in a voltaic cell.
C. Copper ions become copper atoms at the cathode because copper is always reduced in a voltaic cell.
D. Diatomic hydrogen becomes hydrogen ions at the anode because the SRP is more negative.
A hurricane track gives the probability of a hurricane following a specific path. What type of scientific model is this?
You are given 450.0 g of a 0.7500 molal solution of acetone dissolved in water. how many grams of acetone are in this amount of solution?
To find the grams of acetone in the given solution, we can use the formula for molality and calculate the mass of acetone based on the molality, molar mass of acetone, and mass of the solvent.
Explanation:The mass of the solution is given as 450.0 g and the molality is given as 0.7500 molal. To find the grams of acetone in the solution, we can use the formula for molality:
Molality (m) = moles of solute / mass of solvent (in kg)
Since 0.7500 molal corresponds to 0.7500 mol of acetone per 1 kg of water, we can calculate the mass of acetone by multiplying the molality by the molar mass of acetone and the mass of the solvent:
Mass of acetone = 0.7500 molal * (58.08 g/mol) * (0.4500 kg)
Therefore, there are 22.52 grams of acetone in this amount of solution.
What type of graph shows the relationship between two quantities as those quantities are changing?
what conclusion did rutherford draw from this experiment?
From his experiments, Rutherford deduced two main conclusions: first, the majority of an atom's space is empty, and second, the alpha particles' drastic deflections were due to a highly concentrated, positive charge, i.e., the atomic nucleus. The nucleus, according to Rutherford, is 100,000 times smaller than the atom.
Explanation:Ernest Rutherford, after conducting multiple experimental runs, arrived at two conclusions with respect to the internal structure of atoms:
Most of the atom's space is essentially empty, evidenced by the fact that the majority of fast-moving alpha particles passed through the gold atoms undeflected.A small portion of the alpha particles deflected drastically, implying that they had encountered a highly concentrated, positive charge within a small fraction of the atom's space. This was interpreted as the atomic nucleus.Rutherford's theory suggested that the nucleus was about 10-15 m in size, which made it 100,000 times smaller than the atom itself. The experiment had a profound impact on the field of Physics, leading Rutherford to propose that nearly all the mass of atoms is concentrated in their nucleus. This revolutionary understanding significantly altered the then-existing atomic model and paved the way for a deeper understanding of atomic structure.
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Can someone help mee, pls show the works.. Thx
Answer:
6.6 moles of CO2 is produced
Explanation:
97 g of C3H8 is equal to 2.2 moles, so we'll use ratio method according to which for 97 g of C3H8 6.6 moles of CO2 is produced
In a voltaic cell, where does the reduction take place?
Answer : The reduction reaction takes place at cathode.
Explanation :
Voltaic cell : It is defined as a device which is used for the conversion of the chemical energy produces in a redox reaction into the electrical energy.
In the voltaic cell, the oxidation occurs at an anode which is a negative electrode and the reduction occurs at the cathode which is a positive electrode.
For example : The redox reaction occurs between the zinc and copper sulfate.
The balanced two-half reactions will be,
Oxidation half reaction (cathode) : [tex]Zn(s)\rightarrow Zn^{2+}(aq)+2e^-[/tex]
Reduction half reaction (anode) : [tex]Cu^{2+}(aq)+2e^-\rightarrow Cu(s)[/tex]
Thus the overall reaction will be,
[tex]Zn(s)+Cu^{2+}(aq)\rightarrow Zn^{2+}(aq)+Cu(s)[/tex]
Hence, the reduction reaction takes place at cathode.
Which structure shows the correct electron arrangement in CCl4?
Answer : The figure is attached in the attachment.
Explanation : The central atom will be carbon to which at 109.8 degrees will be each chlorine atoms. And the central carbon atom is [tex] SP^{3}[/tex] hybridized. There will be four chlorine atom surrounding the central carbon atom. There will be 3 lone pairs of electron on each of the chlorine atom which gets attached with carbon atom.
The Lewis structure shows the electrons in a molecule.
The Lewis structure of a molecule shows the number of electrons in the molecule. The unshared electrons are shown as dots while the shared electrons may be showed as a single dash.
The correct Lewis structure of CCl4 is shown in the image attached to this answer.
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Consider the incomplete reaction below.
NaOH + X mc005-1.jpg NaCH3COO + H2O
What is X in this reaction?
NH4OH
H3PO4
H2CO3
CH3COOH
In the given neutralization reaction, X would be CH₃COOH.
Let's consider the incomplete reaction below.
NaOH + X ⇒ NaCH₃COO + H₂O
This seems to be a neutralization reaction.
What is a neutralization reaction?It is a reaction between an acid and a base to form salt and water.
We can identify:
Acid: XBase: NaOHSalt: NaCH₃COOWater: H₂OWhat is X in this reaction?
NH₄OH. No, because it is not an acid.H₃PO₄. No, because it wouldn't form NaCH₃COO. H₂CO₃. No, because it wouldn't form NaCH₃COO.CH₃COOH. Yes.In the given neutralization reaction, X would be CH₃COOH.
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Which term describes the sum of the number of protons and neutrons in an atom?
Answer: The term is Mass number.
Explanation:
Atomic number is defined as the number of protons or number of electrons present in an atom. It is represented as Z.
Z = Number of protons = Number of electrons
Mass number is defined as the sum of number of protons and neutrons in an atom. It is represented as A.
A = Number of proton + Number of neutrons
Hence, the correct answer is Mass number.
When fast moving electrons are released from an atom by way of a beta particle, the atom ends up with...
one less proton and one more neutron.
one more proton and one less neutron.
the same number of protons and two more neutrons.
two more neutrons and the same number of protons.
A solution is prepared by dissolving 16.2 g of benzene (c6h6) in 282 g of carbon tetrachloride (ccl4). the concentration of benzene in this solution is ________ molal. the molar masses of c6h6 and ccl4 are 78.1 g/mol and 154 g/mol, respectively.
Answer:
43.7%
Explanation:
How many carbon atoms are found in a molecule of 2-methyl-3-nonene? 8 9 10 11
If you are given a 1.0 L (1000mL) of an unknown liquid which has the mass of 500 grams it is most likely which of the above substances? Show work to back up your answer. Distilled water density 1.0 g/cm^3 propane density 0.494 g/cm^3 salt water density 1.025 g/cm^3 liquid gold density 17.31g/cm^3