When do dorbitals start getting filled?
A. After the s orbital of the next highest energy level
B. After the sorbital of the same energy level
c. After the p orbitals of the next highest energy level
D. After the porbitals of the same energy level

Answer:

3.293 m

Explanation:

Data Given:

Frequency of radio wave = 91.10 FM or 91.10 MHz

1 MHz = 10⁶ Hz

1 Hz = 1 s⁻¹

wavelength = ?

Solution:

As Frequency of radio wave is 91.10 FM or 91.10 MHz

if we look for conversion of MHz to Hz

So,

1 MHz = 10⁶ Hz

91.10 MHz = (91.10)(10⁶)  =  91.1 x 10⁶ Hz

So

91.10 MHz = 91.1 x 10⁶ Hz

Now we look for conversion of Hz to s⁻¹

1 Hz = 1 s⁻¹

91.1 x 10⁶ Hz = 91.1 x 10⁶ s⁻¹

So

91.1 x 10⁶ Hz = 91.1 x 10⁶ s⁻¹

Now equation used to calculate wavelength

         f = c/λ

rearrange the above equation

        λ = c/f ........(1)

Where:

c = speed of light = 3 x 10⁸ ms⁻¹

λ= wavelength

put the values in above equation 1

           λ = 3 x 10⁸ ms⁻¹ / 91.1 x 10⁶ s⁻¹

           λ = 3.293 m

So the wavelength of radio station wave = 3.293 m

Answer:

Column 1. They have one valence electron

Column 2. They have 2 valence electrons

Transition metal column. Variable oxidation states

Column 3–7. Valence electron ranges from 3 to 7 electrons

Column 8. Completely filled i.e no valence electron

Explanation:

Each column of the periodic table represents elements with a specific number of valence electrons. Columns 1 and 2 have one and two valence electrons respectively, and are known for their reactivity. Transition metals typically have one or two, Columns 3-7 have 3 to 7, and Noble Gases in Column 8 have a full shell of eight, making them unreactive.

We can categorize columns, or groups, of the periodic table by the number of valence electrons, which are the outermost electrons in an atom that participate in chemical bonding.

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Answer:my answer  is correct

Explanation:

The box has been used to keep the food hot has been a bad conductor of heat. The heat has been entrapped within the box that helps for the food to keep hot.

The material used for the box to keep the food hot has been rubber. Thus, option C is correct.

The conductor is the materials that has been able to transfer the energy. The insulators are the materials that do not allow the transfer of energy.

The metals have been considered as good conductor of energy. Thus, with the use of stainless steel, aluminum foil, or even glass results in the transfer of energy from food to the environment resulting in cooling the food.

The rubber has been a bad conductor of energy and is a good insulator. It has been able to entrap the heat energy in the box and keeps the food hot. Thus, option C is correct.

Learn more about conductors, here:

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Answer: B. Heat from the lemonade moved into the ice

Explanation: The concept of heat flow is explains that heat always move from higher temperature to lower temperature. So the heat in the lemonade moves into the ice until they attain thermal equilibrium or equal temperature.

"Asthenosphere" describes a section of Earth's structure below moving continents as parts of large plates.

Answer: Option C

Explanation:

The asthenosphere denoted as the upper mantle of a very sticky, mechanically weak and flexible area in the earth. It is located below the surface of the lithosphere at depths of about 80 and 200 km (in terms of miles, 50 and 120). The boundary is commonly called the lithospheric LAB - asthenosphere.

The asthenosphere is nearly solid, though some of its regions could be molten below mid-ocean ridges for an instance. The lower asthenosphere boundary isn't well defined. The asthenosphere's thickness depends primarily on the temperature.

Answer:

C. effusion because there is a movement of a gas through a small opening into a larger volume

Explanation:

Effusion makes fluid/gas molecules move to the container with less pressure or larger volume. In diffusion, the movement should work two ways even though one side might receive more. But in effusion, the movement is rather one way.

This case shows how effusion work because its not the concentration that makes the balls moving to the bottom part of the container. No ball moving from bottom container to top either.

Answer:

C. effusion because there is a movement of a gas through a small opening into a larger volume

Explanation:

got it right on edg

Newton's universal law of gravitation states that all objects attract each other with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Gravitational force is a kind of attraction force which acts between two objects and it is represented as:

G = m₁m₂/r²

From the formula it is clear that:

Hence correct options are directly, inversely, directly, acceleration, gravity, larger and toward respectively.

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Answer:

1.0876 M

Explanation:

Initial Volume of NaOH (V1) = 1234.56 mL

Convert mL to L

1 mL = 0.001 L

1234.56 mL = 1234.56 x 0.001 = 1.2346 L

Initial Molarity of NaOH (M1) = 3.33 M

final Volume of NaOH  (V2) = 3.78 L

Final Molarity of NaOH (M2) = ?

Solution:

As we diluting the concentrated NaOH

Note: Molarity = M= mol/L

So, Dilution formula will be used

         M1 V1 = M2 V2

Put values in above equation

            3.33 mol/L x 1.2346 L = M2 x 3.78 L

Rearrange the above equation

           M2 = 3.33 mol/L x 1.2346 L  / 3.78 L

           M2 = 4.1112 mol / 3.78 L

           M2 = 1.0876 M

So, the final molarity of the diluted Sodium hydroxide (NaOH) solution is 1.0876 M.

Answer:

7 moles

Explanation:

The molecular formula of sodium sulfide is Na_2S

One molecule of Sodium sulfide has 2 atoms of sodium and one atom of sulfur

1 mole of Sodium sulfide has  2 moles of sodium and one mole of sulfur

so 3.5 moles of sodium sulfide will have 2× 3.5 moles of sodium atoms

i.e 2×3.5= 7 moles of sodium atom

Final answer:

In 3.5 moles of sodium sulfide (Na₂S), there are 7 moles of sodium atoms because each molecule of sodium sulfide contains two sodium atoms.

Explanation:

To calculate the number of moles of sodium atoms contained in 3.5 moles of sodium sulfide (Na₂S), we need to consider the chemical formula of the compound. Sodium sulfide is made up of two sodium atoms (Na) for every sulfide ion (S²⁻). Therefore, each mole of Na₂S will contain 2 moles of sodium atoms.

Using this stoichiometric relationship, the calculation for the number of moles of sodium atoms in 3.5 moles of sodium sulfide is as follows:

Answer: Al2S3

Explanation: The oxidation number of Al is +3 since it is in group 3 ( Al+3).

Sulfur is in group 6 and has an oxidation of -2 since it is a nonmetal and an anion.

Criss cross the charges and write them as subscripts.

So the chemical composition is

Al2S3

Answer:

The answer is true

Explanation:

This process is called passive transport or facilitated diffusion, and does not require energy. The solute can move "uphill," from regions of lower to higher concentration. This process is called active transport, and requires some form of chemical energy.

Answer:

True

Explanation:

Answer: A. 6

Explanation: It is not present in the balanced chemical equation. Therefore it is not part of the coefficient in the reaction of the substances.

Answer:

It increases by a factor of four

Explanation:

Boyle's Law : At constant temperature , the volume of fixed mass of a gas is inversely proportional to its pressure.

pV = K.......(1)

pV = constant

Charles law : The volume of the gas is directly proportional to temperature at constant pressure.

V = KT

or V/T = K = constant ....(2)

Applying equation (1) and (2)

[tex]\frac{PV}{T}=K[/tex]

[tex]\frac{P_{1}V_{1}}{T_{1}}=\frac{P_{2}V_{2}}{T_{2}}[/tex]

According to question ,

T2 = 4 (T1)

V2 = V1

Put the value of T2 and V2 , The P2 can be calculated,

[tex]\frac{P_{1}V_{1}}{T_{1}}=\frac{P_{2}V_{1}}{4T_{1}}[/tex]

V1 and V1 cancel each other

T1 and T1 cancel each other

We get,

[tex]P1=\frac{P2}{4}[/tex]

or

P2 = 4 P1

So pressure increased by the factor of four

Answer:

b

Explanation:

on edge

Answer:

m = 575 g

Explanation:

Given data:

Volume of solution = 0.500 L (0.500×1000 = 500 mL)

Density of glucose solution = 1.15 g/mL

Mass of glucose solution = ?

Solution:

Formula:

d = m/v

d = density

m = mass

v = velocity

Now we will put the values in formula.

1.15 g/mL = m/500 mL

m = 1.15 g/mL × 500 mL

m = 575 g

Answer:

Milk is considered a colloid because it is a homogeneous mixture

Explanation:

Milk is a colloid because it's a liquid mixture where solid protein particles, large enough to scatter light, are evenly distributed and do not settle with time. This causes milk, like all colloids, to appear cloudy or opaque.

Milk is considered a colloid because it is an example of a liquid mixture in which solid particles, that are large enough to scatter light, are dispersed. This property of colloids is known as the Tyndall effect, and it's the reason why colloids, including milk, may appear cloudy or opaque.

The term 'colloid' originates from the Greek words for 'glue' and 'like' and was first used to designate mixtures similar to milk, which contains small protein particles dispersed throughout the liquid. When milk is dehydrated, it forms powdered milk particles of colloidal size.

In simpler terms, a colloid is a kind of mixture where one substance is evenly distributed within another, and the dispersed particles do not settle with time, just like the molecules in milk.

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Volt is the unit to measure cell potential.

Explanation:

The cell potential is the measure of potential difference in the two halves of the electrochemical cell.

It is the measure of how much voltage exists between the two halves of the battery. The unit of volt is joule/coulomb. The cell potential is measured by voltmeter.

The energy per unit charge from the oxidation-reduction reaction to drive the reaction is cell potential.

Answer:

I am so sorry I wish I could help

Explanation:

maybe use a calculator

The percent error in the measured density of alcohol, with a measured value of 0.8023 g/mL and a true value of 0.7980 g/mL, is approximately 0.539%.

To calculate the percent error for the measured density of alcohol compared to the true value, you can use the following formula:

Percent Error = ( |Measured Value - True Value| / True Value ) 100%

Applying this formula to the given values:

We calculate the absolute difference and then divide by the True Value:

0.8023 g/mL - 0.7980 g/mL| = 0.0043 g/mL

Now divide by the True Value of 0.7980 g/mL and multiply by 100:

(0.0043 g/mL / 0.7980 g/mL) 100%
approximately 0.539%

Therefore, the percent error in the measurement of the density of alcohol is approximately 0.539%.

Answer:

Explanation:

To interpret this pedigree, let’s start with information that we already know:

Brown is recessive, which means brown individuals must have the phenotype BB. In this pedigree, brown individuals are filled in.

Black is dominant, which means black individuals must have at least one B allele. Their phenotype could be either BB or BB. In this pedigree, black individuals are not filled in.

Figure 5 shows the same pedigree, but with information about the individual’s phenotype filled in.

The shaded individual, who is a brown female puppy, must have the phenotype BB. If she had any B alleles, she would be black because the black allele is dominant over the brown allele.

In order for the brown puppy to have the phenotype BB, she must have gotten two “b” alleles: one from each of her parents. We know that her parents are both black (because they are unshaped), which means they must have a least one “B” allele. This means that both parents must be heterogeneous: BB.

The three black puppies must have at least one “B” allele in order for them to be black in color. However, we can’t tell whether they are homologous dominant (BB) or heterogeneous (BB) since both of those phenotype would result in black color. One way to represent this on a pedigree is B-, meaning that the second allele could be either B or b.

Three ways to increase the rate of dissociation of a solid are:

1. Increasing the surface area of the solute.

2. Increasing the temperature of the solvent.

3. Agitating the solute and solvent mixture.

Explanation:

The dissociation of a solid is defined as the separation of ions when an ionic compounds dissolve. The dissociation rate can be increased by increasing the surface area of the solute because it would get enough  chance to interact with other particles, hence the rate of dissociation increases.

By increasing the temperature, the kinetic energy of the molecules increase thereby dissolving more of the solute particles.

Agitating affects dissociation rate because it helps solute particle to get distributed evenly and hence gets dissociate easily.

Answer:

4 overharvesting of seafood. All of the other options directly cause global warming/ climate change.

Explanation:

The cartoon suggests that people are observing unusual weather patterns, and among the environmental concerns listed, deforestation is the one that does not support the main idea.

The cartoon suggests that people are observing unusual weather patterns. To identify the environmental concern that does not support the main idea of the cartoon, we need to examine the choices provided.

However, based on the information given, we can make an educated guess.

1. Deforestation: Deforestation refers to the clearing or removal of trees from a forested area. While deforestation can have various environmental impacts, such as habitat destruction and soil erosion, it is not directly related to observing unusual weather patterns. Therefore, deforestation could be the environmental concern that does not support the main idea of the cartoon.

2. Air pollution: Air pollution refers to the presence of harmful substances in the air, such as gases and particles. While air pollution can affect weather patterns to some extent, it is not necessarily an unusual weather pattern itself. Therefore, air pollution may not be the environmental concern that does not support the main idea of the cartoon.

3. Global warming: Global warming refers to the long-term increase in Earth's average temperature due to human activities, primarily the emission of greenhouse gases. Global warming can lead to various changes in weather patterns, including more frequent and intense extreme weather events. Therefore, global warming is likely to support the main idea of the cartoon.

4. Water scarcity: Water scarcity refers to the lack of sufficient water resources to meet the demands of a particular region or population. While water scarcity can be influenced by changes in weather patterns, it is not necessarily an unusual weather pattern itself. Therefore, water scarcity may not be the environmental concern that does not support the main idea of the cartoon.

Based on the analysis above, deforestation is the environmental concern that does not support the main idea of the cartoon, which is about people observing unusual weather patterns.

Answer:

In a classroom, the comparison that a teacher would most likely use for describing a mole is: jar of jellybeans and a gram of salt crystals.

Explanation:

Answer:

False

Explanation:

Final answer:

The measurement 8.3 kg·m^2/s^2 can be rewritten as 8.3 joules (J), as 1 kg·m^2/s^2 is equivalent to 1 joule.

Explanation:

The measurement 8.3 kg·m^2/s^2 can be simplified to a simpler unit which is the joule (J). In physics, the unit of energy, work, and heat is the joule, and it is defined as 1 kg·m^2/s^2. Hence, the given measurement of 8.3 kg·m^2/s^2 is equal to 8.3 joules (J). The measurement 8.3 kg·m^2/s^2 can be simplified to a simpler unit which is the joule (J). In physics, the unit of energy, work, and heat is the joule, and it is defined as 1 kg·m^2/s^2.The measurement 8.3 kg·m^2/s^2 can be simplified to a simpler unit which is the joule (J). In physics, the unit of energy, work, and heat is the joule, and it is defined as 1 kg·m^2/s^2. Hence, the given measurement of 8.3 kg·m^2/s^2 is equal to 8.3 joules (J). This conversion is based on the fact that energy (E) can be expressed in terms of mass (m), the acceleration due to gravity (g), and height (h) in the equation E = mgh, with g typically approximated as 10 m/s^2 for convenience. Hence, the given measurement of 8.3 kg·m^2/s^2 is equal to 8.3 joules (J). This conversion is based on the fact that energy (E) can be expressed in terms of mass (m), the acceleration due to gravity (g), and height (h) in the equation E = mgh, with g typically approximated as 10 m/s^2 for convenience.The measurement 8.3 kg·m^2/s^2 can be simplified to a simpler unit which is the joule (J). In physics, the unit of energy, work, and heat is the joule, and it is defined as 1 kg·m^2/s^2. Hence, the given measurement of 8.3 kg·m^2/s^2 is equal to 8.3 joules (J). This conversion is based on the fact that energy (E) can be expressed in terms of mass (m), the acceleration due to gravity (g), and height (h) in the equation E = mgh, with g typically approximated as 10 m/s^2 for convenience.This conversion is based on the fact that energy (E) can be expressed in terms of mass (m), the acceleration due to gravity (g), and height (h) in the equation E = mgh, with g typically approximated as 10 m/s^2 for convenience.

Answer:

Explanation:

The following are the order of point from oldest to most recent

1. Atoms are tiny indivisible particles that make up all mater.

it is Postulate of Dalton's atomic theory. this theory was put forward in 1803

2.  Negatively charged electrons are embedded in a mass of positive charge.

In 1897 J.J Thomson discovered that atom consist of tiny negatively charged particles called electrons that are uniformly spread in +vely charged matrix this model called as plum pudding model.

3. Atoms consist of mostly empty space with a dense nucleus of positive charge.

While doing experiment on gold foil Rutherford presented a model in 1909 and stated that atom consist mostly empty space with dense nucleus.

4. Electrons occupy specific energy levels surrounding a positively charged nucleus.

Niels Bohr in 1913 put forward a model to explain atomic orbitals/energy level. This is a postulate of Bohr model.

5. Electrons move about a positively charged nucleus in clouds that are defined by probabilities.

In 1926 Erwin Schrödinger explain the wave function of electrons and its probability.

Answer:

Ba²⁺(aq) + SO₄²⁻(aq)  →   BaSO₄(s)

Explanation:

Chemical equation:

BaCl₂ +  Na₂SO₄   →   BaSO₄ + NaCl

Balanced Chemical equation:

BaCl₂(aq) +  Na₂SO₄(aq)   →   BaSO₄(s) + 2NaCl(aq)

Ionic equation:

Ba²⁺(aq) + 2Cl⁻(aq) + 2Na⁺(aq) + SO₄²⁻(aq)  →  BaSO₄(s)+ 2Na⁺(aq) + 2Cl⁻ (aq)

Net ionic equation:

Ba²⁺(aq) + SO₄²⁻(aq)  →   BaSO₄(s)

The Na⁺ (aq) and Cl⁻(aq) are spectator ions that's why these are not written in net ionic equation. The barium sulfate is present in solid form that's why can not be splitted into ions.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

Answer:

b. the higher the frequency of a wave, the more energy it has

Explanation:

The relationship between frequency and wavelength of electromagnetic waves is an inverse relationship. As the frequency increases, the wavelength decreases, and vice versa.

The correct relationship between frequency and wavelength of electromagnetic waves is option C: The frequency increases as the wavelength decreases.

This is known as the inverse relationship between frequency and wavelength. As the frequency increases, the wavelength decreases, and vice versa. This can be explained using the formula v = fλ, where v is the velocity of the wave, f is the frequency, and λ is the wavelength. Since the velocity remains constant, as the frequency increases, the wavelength must decrease to maintain the equation.

For example, in the electromagnetic spectrum, as we move from radio waves to microwaves, the frequency increases and the wavelength decreases. Conversely, as we move from infrared waves to visible light waves, the frequency increases and the wavelength decreases as well.

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Answer: 1.29 x 10^24 atoms of Nitrogen is present

Explanation:

molar mass of NO = 14 +16 = 30g/mol

number of moles of NO = 4.58mol

number of moles of Nitrogen in NO is = (14/30)x4.58= 2.1373 moles

To get the number of atoms of Nitrogen we use Avogadro's number

Number of atoms of Nitrogen= mole fraction of Nitrogen x Avogadro's constant = 2.1373 x 6.02 x 10^23 = 1.29 x 10^24 atoms

To find the number of moles in [tex]\(4.81 \times 10^{24}\)[/tex] atoms of LiCl, use Avogadro's constant. The calculation yields approximately 8 moles, indicating the quantity of formula units present in the given number of atoms.

To determine the number of moles in a given quantity of formula units, you can use Avogadro's constant. Avogadro's constant states that one mole of any substance contains approximately [tex]\(6.022 \times 10^{23}\)[/tex] entities (atoms, molecules, or formula units). In this case, the formula unit is LiCl.

Given that there are [tex]\(4.81 \times 10^{24}\)[/tex] atoms of LiCl, we can set up the conversion:

[tex]\[ \text{Number of moles} = \frac{\text{Number of entities}}{\text{Avogadro's constant}} \][/tex]

[tex]\[ \text{Number of moles} = \frac{4.81 \times 10^{24}}{6.022 \times 10^{23}} \approx 8 \][/tex]

Therefore, there are approximately 8 moles of LiCl formula units in [tex]\(4.81 \times 10^{24}\)[/tex] atoms.

The question probable maybe:

How many moles are in [tex]4.81*10^2^4[/tex] atoms of formula units of LiCl?

The student's question is about the amount of lithium (4.81*10^24 atoms), which relates to its atomic properties and applicability in technologies like lithium ion batteries.

The question involves calculating the amount of lithium using Avogadro's number and understanding lithium's atomic structure and isotopes. Lithium (Li), with an atomic number of 3, has 3 protons and often appears as its isotope lithium-7, which has 4 neutrons. The mass number of lithium-7 is 7, indicating it has a mass of 7.016 u. The electron configuration for lithium is 1s22s1, with the first two electrons filling the 1s orbital and the third electron in the 2s orbital. This knowledge is essential in fields like battery technology, where Lithium ion batteries are prominent. Lone pairs and London dispersion forces also play a role in the properties of lithium compounds, but the student's question is focused on the number of atoms, so those concepts are less directly relevant here.

Answer:

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

Explanation: