Answer:
B
Explanation:
Remember the formula;
density = mass/volume
If the mass are same but the volume is different. So the density also different
Two objects have the same mass, but one object occupies a smaller volume than the other because the two objects have different densities. Thus, option B is true.
What is density?“Density is defined as a mass of a unit volume of a material.”
Density can be expressed as:
d = m/v
Where m = mass and v = volume
Density is commonly expressed as gram per cubic centimeter.
Mass is a measure of the amount of matter that an object contains. Volume is the amount of space occupied by the substance or object.
Density is directly proportional to mass and inversely proportional to volume. Thus, with an increase in density, mass increases and volume decreases, and vice-versa.
The two objects have the same mass, but one object occupies a smaller volume than the other because the two objects have different densities. Thus, option B is true.
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How many electron shells will elements in the 3rd period of the periodic table have?
Answer:
electron apacity of the third shell is 18
Calculate the work of expansion accompanying the complete combustion of 1 g of glucose to carbon dioxide and liquid water at 20°C when the external pressure is 1 atm. Answer in J -Nm). (Assume that the carbon dioxide gas that is formed behaves ideally.) 25 points Save Answer
The work of expansion accompanying the complete combustion of 1 g of glucose to carbon dioxide and liquid water at 20°C, with an external pressure of 1 atm, is approximately -5640 J (or -5640 Nm).
To calculate the work of expansion, we need to consider the change in volume and the external pressure. The complete combustion of glucose (C6H12O6) to carbon dioxide (CO2) and water (H2O) can be represented by the balanced chemical equation:
C6H12O6 + 6O2 -> 6CO2 + 6H2O
First, we need to determine the moles of glucose. The molar mass of glucose is approximately 180.16 g/mol. Therefore, 1 g of glucose is equal to 1/180.16 mol.
Next, we need to calculate the volume of carbon dioxide produced. Since the gas behaves ideally, we can use the ideal gas law:
PV = nRT
Assuming the volume is measured at the same temperature and pressure as the external conditions, we can substitute the values into the equation. The number of moles of carbon dioxide is equal to the number of moles of glucose, which is 1/180.16 mol. The temperature is 20°C, which is 293 K. The ideal gas constant, R, is 0.0821 L·atm/(mol·K).
We can now calculate the volume of carbon dioxide produced. Rearranging the ideal gas law equation, we have:
V = (nRT)/P = (1/180.16) mol × 0.0821 L·atm/(mol·K) × 293 K / 1 atm
The work of expansion, W, is given by:
W = -PΔV
Since the external pressure is 1 atm and the change in volume is the volume of carbon dioxide produced, the work of expansion is:
W = -1 atm × (1/180.16) mol × 0.0821 L·atm/(mol·K) × 293 K / 1 atm
Simplifying the expression, we find that W ≈ -5640 J (or -5640 Nm).
Therefore, the work of expansion accompanying the complete combustion of 1 g of glucose to carbon dioxide and liquid water at 20°C, with an external pressure of 1 atm, is approximately -5640 J (or -5640 Nm). The negative sign indicates work done by the system.
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What are the chemical compounds of neon and argon?
Answer:
Silica.
Explanation:
Argon fluorohydride or argon hydrofluoride is an inorganic compound with the chemical formula HArF. It is a compound of the chemical element argon.
Neon is a very inert element, however, it has been reported to form a compound with fluorine. It is still questionable if true compounds of neon exist, but evidence is mounting in favor of their existence.
What is an energy level?
a. The region outside the nucleus where an electron is likely to be moving.
b. The region inside the nucleus where an electron is located.
c. The region outside the nucleus where a proton is likely to be moving.
d. The region outside the nucleus where a neutron is likely to be moving.
Answer:
A. The region outside the nucleus where an electron is likely to be moving.
Answer:
Energy levels (also called electron shells) are fixed distances from the nucleus of an atom where electrons may be found. Electrons are tiny, negatively charged particles in an atom that move around the positive nucleus at the center. Energy levels are a little like the steps of a staircase. You can stand on one step or another but not in between the steps. The same goes for electrons. They can occupy one energy level or another but not the space between energy levels.
:D
What is the boiling point (in C) of a 1.58 m aqueous solution of CaCl2? (Amount to three decimal points)
The boiling point of a 1.58 m aqueous solution of CaCl2 is approximately 102.4352 °C.
The boiling point of a 1.58 m aqueous solution of CaCl2 can be calculated using the equation for boiling point elevation. The boiling point elevation is a colligative property, meaning it depends on the concentration of solute particles rather than the identity of the solute. In this case, the solute is CaCl2, which dissociates into three ions: one Ca2+ ion and two Cl- ions.
The boiling point elevation equation is ΔTb = Kb * m * i, where ΔTb is the boiling point elevation, Kb is the molal boiling point elevation constant, m is the molality of the solution, and i is the van't Hoff factor, which represents the number of particles formed when the solute dissociates. For CaCl2, i = 3 because it dissociates into three ions. The molality of the solution is given as 1.58 m. The molal boiling point elevation constant for water is typically around 0.512 °C/m.
Plugging in the values, we can calculate the boiling point elevation: ΔTb = 0.512 °C/m * 1.58 m * 3 = 2.4352 °C. To find the boiling point of the solution, we add the boiling point elevation to the normal boiling point of water, which is 100 °C: Boiling point = 100 °C + 2.4352 °C = 102.4352 °C.
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What is a compound?
A.the center of an atom that is formed by neutrons, protons, and electrons
B.a tiny particle that makes up all matter
C.a molecule that is formed from two or more different types of atoms
D.a molecule that is formed from the same type of atoms
Answer:
I believe the correct answer is c but I'm not a 100% positive
How far is my house if I travel 1 mi/min and it takes me 23 minutes to go home
Answer: The answer would be 23 miles
Explanation: If you are traveling 1mi/min for 23 mins you would add 1, 23 times because it is 1 mile PER minute. Therefore it would be 23 miles.
if a solution of hf (ka=6.8×10−4) has a ph of 3.50, calculate the concentration of hydrofluoric acid.
The concentration of hydrofluoric acid (HF) in the solution is approximately 1.96 × 10^(-2) M.
To calculate the concentration of hydrofluoric acid (HF) in a solution with a pH of 3.50, we need to use the relationship between pH and the acid dissociation constant (Ka).
By taking the negative logarithm (pH) of the hydrogen ion concentration ([H+]) and using the Ka value of HF, we can determine the concentration of HF. In this case, the concentration of HF is found to be approximately 1.96 × 10^(-2) M.
The pH of a solution is related to the concentration of hydrogen ions ([H+]) in the solution. The relationship is given by the equation:
pH = -log[H+]
In this case, the pH is given as 3.50. Taking the antilog (10^x) of both sides of the equation, we can determine the hydrogen ion concentration:
[H+] = 10^(-pH) = 10^(-3.50)
Next, we need to consider the dissociation of hydrofluoric acid (HF) and its acid dissociation constant (Ka):
HF ⇌ H+ + F-
The Ka value for HF is given as 6.8 × 10^(-4). Since the concentration of H+ is equal to the concentration of HF at equilibrium, we can set up the equation:
Ka = [H+][F-] / [HF]
Substituting the values we have:
6.8 × 10^(-4) = (10^(-3.50))(x) / x
Simplifying the equation:
6.8 × 10^(-4) = 10^(-3.50)
Taking the logarithm (log) of both sides of the equation:
log(6.8 × 10^(-4)) = -3.50
Calculating the concentration of HF (x):
x ≈ 1.96 × 10^(-2) M
Therefore, the concentration of hydrofluoric acid (HF) in the solution is approximately 1.96 × 10^(-2) M.
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Notes for timeline panel
the coefficients in a balanced chemical equation directly represent moles of reacting substances.select one:truefalse
True. The statement “the coefficients in a balanced chemical equation directly represent moles of reacting substances” is true. Coefficients in a balanced chemical equation serve as the mole ratios of reactants and products, which provide an indication of the number of moles of each chemical involved in a reaction.
The mole ratio is a conversion factor used to convert the number of moles of one substance into the number of moles of another substance in the chemical equation. It represents the number of moles of each substance involved in a balanced chemical equation and also represents the number of molecules involved in a chemical reaction.
Coefficients in a balanced chemical equation help to identify the number of molecules or moles of each substance involved in a chemical reaction.
The coefficients represent the number of moles of each substance needed to complete a chemical reaction, and the mole ratios of reactants and products are equal to these coefficients. They enable the chemist to determine the limiting reagent and the amount of product that can be formed in a reaction. The mole ratios of reactants and products in a balanced chemical equation are very important for predicting the outcomes of chemical reactions.
If the coefficients in the balanced chemical equation are not balanced, it would be difficult to predict the amount of product that can be produced by a reaction. Therefore, it is important to balance chemical equations before using them to predict the outcomes of chemical reactions. In conclusion, the statement “the coefficients in a balanced chemical equation directly represent moles of reacting substances” is true.
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What is the molarity of a solution if 41. 50 g potassium iodide (ki) is added to a container that is then filled with water to a final volume of 211 ml?
Given that 41.50 g of potassium iodide (KI) is added to a container that is then filled with water to a final volume of 211 mL.
We need to find the molarity of the solution. Molarity is defined as the number of moles of solute dissolved in one liter of solution.
In order to find the molarity,
we need to determine the number of moles of KI first.Number of moles of KI = (given mass of KI) / (molar mass of KI) = 41.50 g / 166.0 g/mol = 0.25 mol
Now we can use this to find the molarity .Molarity (M) = (number of moles of solute) / (volume of solution in liters) M = (0.25 mol) / (211 mL / 1000 mL/L) = 1.18 M
Therefore, the molarity of the solution is 1.18 M.
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When we know the initial concentrations of the reactants and the changes in those concentrations, we multiply them to find the equilibrium concentrations. True False
False. When we know the initial concentrations of the reactants and the changes in those concentrations, we cannot simply multiply them to find the equilibrium concentrations.
Instead, we need to apply the principles of chemical equilibrium and use the equilibrium constant expression to determine the equilibrium concentrations.
The equilibrium constant expression relates the concentrations of the reactants and products at equilibrium and is specific to the balanced chemical equation for the reaction. It is expressed in terms of the molar concentrations (or pressures) of the species involved.
For a generic chemical reaction:
aA + bB ⇌ cC + dD
The equilibrium constant expression is:
K = ([C]^c * [D]^d) / ([A]^a * [B]^b)
Where [A], [B], [C], and [D] represent the molar concentrations of the respective species at equilibrium.
To find the equilibrium concentrations, we need to solve the equilibrium constant expression using the known initial concentrations and the changes in concentrations provided. The changes in concentrations arise from the stoichiometry of the reaction and depend on the balanced equation coefficients.
For example, if the initial concentration of species A is [A]₀ and it undergoes a decrease in concentration of Δ[A], then the equilibrium concentration of A would be ([A]₀ - Δ[A]).
Similarly, if the initial concentration of species B is [B]₀ and it undergoes an increase in concentration of Δ[B], then the equilibrium concentration of B would be ([B]₀ + Δ[B]).
The changes in concentrations can be determined from experimental data or calculated based on the stoichiometry of the reaction and the extent of the reaction.
It's important to note that the equilibrium concentrations represent the concentrations of the species at the point of equilibrium, where the rates of the forward and reverse reactions are equal. Multiplying the initial concentrations by the changes in concentrations does not account for the dynamic nature of the equilibrium process and does not provide accurate equilibrium concentrations.
Therefore, we cannot simply multiply the initial concentrations by the changes in concentrations to find the equilibrium concentrations. Instead, we need to use the equilibrium constant expression and solve for the equilibrium concentrations based on the principles of chemical equilibrium.
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In a calorimetry experiment, it was determined that a 92.0 gram piece of copper metal released 1860 J of heat to the surrounding water in the calorimeter (Qcopper = -1860 J). If the final temperature of the copper metal-water mixture was 25.00 C, what was the initial temperature of the copper metal? The specific heat of copper is 0.377 J/(g°C). a. 28.6 °C
b. -28.6 °C
c. 78.6 °C
d. 92.6 °C
e. 53.6 °C
The initial temperature of the copper metal with specific heat 0.377 J/(g°C) was 78.6 °C. The correct answer is option B.
In a calorimetry experiment, the heat released by the copper metal (Qcopper) can be calculated using the equation:
Qcopper = m * c * ΔT
where:
Qcopper = heat released by the copper metal
m = mass of the copper metal (92.0 g)
c = specific heat of copper (0.377 J/(g°C))
ΔT = change in temperature of the copper metal
We are given that Qcopper = -1860 J (negative sign indicates heat released) and the final temperature of the mixture (after heat transfer) is 25.00 °C.
We need to find the initial temperature of the copper metal.
To find ΔT, we can use the equation:
ΔT = Tfinal - Tinitial
where:
ΔT = change in temperature
Tfinal = final temperature (25.00 °C)
Tinitial = initial temperature (unknown)
Rearranging the equation, we have:
Tinitial = Tfinal - ΔT
Substituting the known values, we get:
Tinitial = 25.00 °C - ΔT
To find ΔT, we rearrange the heat equation as follows:
ΔT = Qcopper / (m * c)
Substituting the known values, we get:
ΔT = -1860 J / (92.0 g * 0.377 J/(g°C))
Simplifying, we get:
ΔT = -1860 J / (34.724 g°C/J)
ΔT ≈ -53.6 °C
Now, substituting the value of ΔT into the equation for T initial, we have:
Tinitial = 25.00 °C - (-53.6 °C)
Tinitial ≈ 78.6 °C
The initial temperature of the copper metal was approximately 78.6 °C. Therefore, the correct answer is option c. 78.6 °C.
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if you have a solution with hydroxide ion ( oh- ) concentration of 0.4180 m, then what would be the ph?
The pH of a solution with hydroxide ion (OH-) concentration of 0.4180 M can be calculated using the formula for the negative logarithm of the hydroxide ion concentration (pOH) and the relationship between pOH and pH.
Here's how: Step 1: Calculate the pOHpOH = -log[OH-]pOH = -log[0.4180]pOH = 0.3786Step 2: Calculate the pH using the relationship between pOH and pHPH + pOH = 14pH = 14 - pOHpH = 14 - 0.3786pH = 13.6214. Therefore, the pH of the solution with a hydroxide ion concentration of 0.4180 M is approximately 13.6214.
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Is magnetic force or gravitational force a stronger force? why?
At what
temperature does oxygen turn from a solid into a liquid (in °C)?
Answer:
‑297 degrees Fahrenheit (‑183 degrees Celsius).
Explanation:
Answer:
-218°C.
Explanation:
Oxygen's melting point is -218°C. At that temperature, solid oxygen starts converting to liquid.
Which of the following reactions would be classified as oxidation-reduction? Check all that apply. View Available Hint(s) 2Na(s) + Cl2(g)→2NaCl(s) O Na(s) +CuCl(aq)-NaCl(aq) +Cu(s) O NaCN(aq) + CuCl(aq)-NaCl(a) CuCN(s)
Among the given reactions, the oxidation-reduction (redox) reactions can be identified as follows:
2Na(s) + Cl2(g) → 2NaCl(s)
Na(s) + CuCl(aq) → NaCl(aq) + Cu(s)
The reaction 2Na(s) + Cl2(g) → 2NaCl(s) is an oxidation-reduction (redox) reaction. In this reaction, sodium (Na) is oxidized from an oxidation state of 0 to +1, and chlorine (Cl) is reduced from an oxidation state of 0 to -1. Sodium loses electrons (undergoes oxidation) and chlorine gains electrons (undergoes reduction) to form sodium chloride (NaCl).
The reaction Na(s) + CuCl(aq) → NaCl(aq) + Cu(s) is also an oxidation-reduction (redox) reaction. In this reaction, sodium (Na) is oxidized from an oxidation state of 0 to +1, and copper (Cu) is reduced from an oxidation state of +2 to 0. Sodium loses electrons (undergoes oxidation) and copper gains electrons (undergoes reduction) to form sodium chloride (NaCl) and solid copper (Cu).
On the other hand, the reaction NaCN(aq) + CuCl(aq) → NaCl(aq) + CuCN(s) does not involve a change in oxidation states, so it is not classified as an oxidation-reduction (redox) reaction.
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In a chemical change
a. a phase change occurs
b. a phase change never occurs
c. the original material can never be regenerated
d. the products are different substances from the starting materials
Answer:
the product are different substances frim the starting materails
1. Use the chemical equation of Photosynthesis to answer the following prompts.
Answer in complete sentences.
6CO2 + 6H2O --> C6H12O6 +602
1. Identify evidence that a chemical reaction has occurred.
2. What element is the most abundant in this chemical reaction?
3. Identify the number of protons, neutrons, and electrons found in the most
abundant element.
4. Identify where we would find the protons, neutrons, and electrons in the
atom of this element.
5. Identify the group and period of the element on the Periodic Table.
swer
Answer:
1. The evidence that chemical reaction has occurred can be found in the change of the reagents present after the reaction, that is formation of glucose in the area where the reaction is taking place
2. The most abundant element of the chemical reaction is oxygen which has a total quantity of 18 atoms in the reaction
3. The oxygen atom has an atomic number of 8 and therefore contains 8 protons and 8 neutrons and (therefore) 8 electrons (to be neutral, electronically)
4. The protons and the neutrons of the atom, oxygen, are located in the nucleus, while the electron are found in the different orbitals surrounding the atom
5. The element, oxygen, symbol, O, belongs to the group 16 of period 2 in the periodic table
Explanation:
In a certain organic compound, one of the carbon atoms is bonded to two atoms: a hydrogen atom and a carbon atom. What type of bond exists between the two carbon atoms? (3 points)
Single covalent
Triple covalent
Ion dipole
Ionic
Answer:
Triple Bond
Explanation:
Carbon has the capability to bond 4 times. If one is going to the hydrogen then the other 3 are going between the carbon elements.
.What factors impact the polarity of a molecule?
a. The 3-D arrangement of atoms in space.
b. The electronegativity difference between the atoms involved in the bonds present in the molecule.
c. Both a. & b. impacts molecular polarity.
d. Neither a. or b. impacts molecular polarity.
Both a. The 3-D arrangement of atoms in space.
b. The electronegativity difference between the atoms impact molecular polarity.
The polarity of a molecule is influenced by both the 3-D arrangement of atoms in space (a.) and the electronegativity difference between the atoms involved in the bonds present in the molecule (b.).
The 3-D arrangement of atoms determines the molecular geometry, which affects the distribution of electron density within the molecule. In a symmetrical arrangement, the polarities of individual bonds may cancel each other out, resulting in a nonpolar molecule. However, an asymmetrical arrangement can lead to an uneven distribution of electron density, causing a molecule to be polar.
The electronegativity difference between atoms in a bond determines the bond polarity. When there is a significant difference in electronegativity, such as between hydrogen (H) and oxygen (O), the bond becomes polar with partial positive and partial negative charges. The overall molecular polarity depends on the vector sum of the individual bond polarities.
Therefore, both option a and b are correct.
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Which one has indefinite shape and indefinite volume? *
1.Aluminum sheet
2. Liquid water
3. Air
4. O Copper wire
Answer:
gas: indefinite shape, indefinite volume. Indefinite shape means that the sample in question takes on the shape of the container. If some water was poured from a round container into a square container, the shape of the sample would change. Indefinite volume means the sample would expand to fill the entire container.
Explanation:
WRITE AND BALANCE THE FOLLOWING EQUATIONS: Ca + H,O -> Ca(OH), + AI(NO3)3 +_ H,SO - Al2(SO )3 + HNO3 *If the equation is already balanced- write "balanced" in the answer box.
The balanced equation becomes: 2Ca + 2H2O -> 2Ca(OH)2 + 2Al(NO3)3 + H2SO4 -> Al2(SO4)3 + HNO3
Now, the equation is balanced with equal numbers of atoms on both sides.
The given equation is: Ca + H2O -> Ca(OH)2 + Al(NO3)3 + H2SO4 -> Al2(SO4)3 + HNO3
To balance the equation, we need to ensure that the number of atoms on both sides of the equation is equal.
First, let's balance the calcium (Ca) atoms. There is one Ca atom on the left side and two Ca atoms on the right side. To balance this, we need to put a coefficient of 2 in front of Ca on the left side.
The balanced equation becomes: 2Ca + H2O -> Ca(OH)2 + Al(NO3)3 + H2SO4 -> Al2(SO4)3 + HNO3
Next, let's balance the hydrogen (H) atoms. There are two H atoms in H2O and two H atoms in H2SO4 on the left side. On the right side, there are four H atoms in Ca(OH)2 and three H atoms in HNO3. To balance this, we need to put a coefficient of 2 in front of H2O on the left side.
The balanced equation becomes: 2Ca + 2H2O -> Ca(OH)2 + Al(NO3)3 + H2SO4 -> Al2(SO4)3 + HNO3
Now, let's balance the oxygen (O) atoms. There are four O atoms in Ca(OH)2 on the right side. To balance this, we need to put a coefficient of 2 in front of Ca(OH)2 on the right side.
The balanced equation becomes: 2Ca + 2H2O -> 2Ca(OH)2 + Al(NO3)3 + H2SO4 -> Al2(SO4)3 + HNO3
Finally, let's balance the aluminum (Al) atoms. There is one Al atom on the right side. To balance this, we need to put a coefficient of 2 in front of Al(NO3)3.
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the primary gas in a volocano is?
Answer:
By far the most abundant volcanic gas is water vapor, which is harmless. However, significant amounts of carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrogen halides can also be emitted from volcanoes
Explanation:
What is it called when an electron is in the lowest possible energy level?
a. Ground state
b. Excited state
c. Bohr state
d. Schrodinger state
Answer:
Ground state
Explanation:
electron is in the lowest possible energy level
excited state is in electron jumps to higher levels
9
The atomic radius of magnesium is 150 pm. The atomic radius of strontium is 200 pm. What
is the atomic radius of calcium? (Atomic radii have been measured for most elements. They
are commonly reported in units of picometers 1 pm = 10-12 m)
Answer:
180 pm
Explanation:
Atomic radius can be defined as a measure of the size (distance) of the atom of a chemical element such as hydrogen, oxygen, carbon, nitrogen etc, typically from the nucleus to the valence electrons. The atomic radius of a chemical element decreases across the periodic table, typically from alkali metals (group one elements such as hydrogen, lithium and sodium) to noble gases (group eight elements such as argon, helium and neon) i.e from the left to the right. Also, the atomic radius of a chemical element increases down each group of the periodic table, typically from top to bottom (column).
Hence, the atomic radius of magnesium, strontium and calcium is 150 pm, 200 pm and 180 pm respectively.
Additionally, the unit of measurement of the atomic radius of chemical elements is picometers (1 pm = 10 - 12 m).
The alkali metals are
Answer:
They are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
Hope this helps :)
Answer:
Groups one of the periodic table.
Lithium Li
Sodium Na
Potassium K
Rubidium Rb
Cesium Cs
Francium Fr
1.000 miles is equal to 1609 meters. A truck is traveling at 42.00 km/hr. What is the speed of the truck in miles per hour?
Answer:
The answer is 400 mph
Explanation:
Match each set of quantum numbers to the correct subshell description by typing in the correct number. 1: n = 2, l = 0 2p: 2: n = 3, l = 2 3d: 3: n = 1, l = 0 2s: 4: n = 2, l = 1 4f: 5: n = 4, l = 3 1s: Type in the maximum number of electrons that can be present in each shell or subshell below. n = 5 shell: n = 2 shell: n = 2, l = 0 subshell: n = 2, l = 1 subshell: 3d subshell: 2s subshell: 5f subshell:
Answer:
4
2
1
5
3
Explanation:
Answer:
edge
Explanation:
Match each set of quantum numbers to the correct subshell description by typing in the correct number.
1: n = 2, l = 0 2p:
4
2: n = 3, l = 2 3d:
2
3: n = 1, l = 0 2s:
1
4: n = 2, l = 1 4f:
5
5: n = 4, l = 3 1s:
3
The illustration below shows how the particles in a substance act in a solid, liquid, and gas. Which of the following causes a substance/object to change from one physical state to another? *
A. an increase or decrease in the temperature of a substance/object causing it to reach a boiling or melting point
B. the bending and shaping of a substance/object
C. mixing a substance with another substance/object
D. all of these will cause a substance/object to change physical states
Answer:
the answer is A. I just learned this.
