What happens during the fall in September?
A.) The Sun is at its highest point in the sky.
B.) The northern end of Earth's axis is tilted toward the Sun.
C.) The Northern Hemisphere receives minimal daylight hours.
D.) The Sun's rays are not as concentrated as in summer.

Correct Answer is; D.

In this question, we have to find the amount of energy required to melt ice at 0°C, and in order to do that, we will be using the Calorimetry formula but modified for melting of ice, the formula will be:

Q = m*ΔHfusion

m is 12.80 grams

ΔHfusion is 334 J/g

Now we add these values into the formula:

Q = 12.80 * 334

Q = 4275 Joules are required

Answer:  **

H-N-H

   |

  H

Explanation:

Look at a periodic table to determine how many electrons you need to account for. Hydrogen (H) only has 1 electron, while Nitrogen (N) has 5. We have three Hydrogen atoms and one Nitrogen atom, so the total number of electrons will be 3 * 1 + 5 = 8 e-.

Now, place the center atom, which will be Nitrogen and place the three Hydrogens on three sides of it as above in the answer. You should use single bonds for this. Each single bond is a pair of electrons, so since we have three single bonds so far, we have accounted for 2 * 3 = 6 electrons. However, we need 2 more electrons for the total of 8. We put these electrons in as a lone pair above Nitrogen.

We check to see if everything follows the octet rule: Nitrogen has three single bonds, so that's 6 e-, as well as one lone pair, so that's another 2 e- for a total of 8 e-. Check. Now look at Hydrogen: H is the only element whose full orbital is 2 e-. Each H has a single bond with Nitrogen, so each does have 2 e-.

Thus, we know this is the correct diagram, and we are done.

Explanation:

A bond line structure of a compound has H N H in linear plane and a hydrogen is branching upward, and the compound is H N (H) H. The nitrogen has two dots at its bottom represents a lone pair of electrons. So ,the correct answer is option C.

The correct Lewis structure for ammonia (\(NH_3\)) is option C. It shows a bond line structure with three hydrogen atoms (H) bonded to a central nitrogen atom (N) in a linear plane.

One hydrogen atom branches upward from the plane. Additionally, the nitrogen atom in this structure has two dots at its bottom, indicating a lone pair of electrons. This arrangement follows the octet rule, as nitrogen has formed three covalent bonds with hydrogen, completing its valence shell. The lone pair on nitrogen gives ammonia its characteristic properties.

Thus, option C accurately represents the Lewis structure of ammonia, showing the bonding and lone pair arrangement of its atoms.

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Since Ghs. 421.78 was deducted from Adjoa's salary pay, her take home pay is Ghs. 4265.46.

Given the following data:

Gross profit can be defined as the profit earned by a business after subtracting its cost of manufacturing and distributing goods from its total revenue (sales).

On a related note, gross salary is the amount of money earned by an individual before any deduction such as tax.

To find how much take home pay Adjoa earned this past month:

\(Take\;home = Gross\;salary - deduction\\\\Take\;home = 4687.24 - 421.78\)

Take home = Ghs. 4265.46.

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Answer:

21.44× 10² atoms

Explanation:

Number of chromium atoms = ?

Moles of potassium chromate = 3.56 × 10⁻²¹ mol

Solution:

1 mole of K₂CrO₄ contain 1 mole of Cr.

3.56 × 10⁻²¹ moles of K₂CrO₄ contain 3.56 × 10⁻²¹  moles of Cr.

Number of atoms of Cr:

1 mole contain 6.022× 10²³ atoms

3.56 × 10⁻²¹ mole ×  6.022× 10²³ atoms / 1mol

21.44× 10² atoms or 2144 atoms

Answer:

Metastable state

Explanation:

The stability of atoms depends on whether or not their outermost shell is filled with electrons. If the outer shell is filled, the atom is stable. Atoms with unfilled outer shells are unstable, and will usually form chemical bonds with other atoms to achieve stability.

Explanation:

Aqueous hydrobromic acid (HBr) will react with solid sodium hydroxide (NaOH) to produce aqueous sodium bromide (NaBr) and liquid water (H₂O). They will react according to the following equation.

HBr + NaOH ---> NaBr + H₂O

0.81 g of HBr are mixed with 0.568 g of NaOH. We have to find the mass of NaBr that can be produced. To do that we have to find which of the reactants is limiting the reaction. First, we will convert their grams into moles using their molar masses.

molar mass of HBr = 80.91 g/mol

molar mass of NaOH = 40.00 g/mol

mass of HBr = 0.81 g

mass of NaOH = 0.568 g

moles of HBr = 0.81 g * 1 mol/(80.91 g)

moles of HBr = 0.0100 moles

moles of NaOH = 0.568 g * 1 mol/(40.00 g)

moles of NaOH = 0.0142 moles

HBr + NaOH ---> NaBr + H₂O

Now if we take a quick look at the coefficients of the reaction we will see that 1 mol of HBr will react with 1 mol of NaOH since both coefficients are 1. Then their molar ratio is 1 : 1. That also means that 0.0100 moles of HBr will only react with 0.0100 moles of NaOH, and we have mixed 0.0142 moles of it. So, NaOH is in excess and HBr is the limiting reagent.

1 mol of HBr : 1 mol of NaOH molar ratio

moles of NaOH = 0.0100 moles of HBr * 1 mol of NaOH/(1 mol of HBr)

moles of NaOH = 0.0100 moles < 0.0142 moles ----> NaOH is in excess

And now that we know that HBr is the limiting reagent we can find the number of moles of NaBr that will be produced by 0.0100 moles of HBr. And finally convert those moles into grams using the molar mass.

1 mol of HBr : 1 mol of NaBr molar ratio

moles of NaBr = 0.0100 moles of HBr * 1 mol of NaBr/(1 mol of HBr)

moles of NaBr = 0.0100 moles

molar mass of NaBr = 102.89 g/mol

mass of NaBr = 0.0100 moles * 102.89 g/mol

mass of NaBr = 1.0289 g

mass of NaBr = 1.0 g

Answer: the maximum mass of sodium bromide that could be produced is 1.0 g.

Answer:

ok

Explanation:

Answer:

Zero

Explanation:

Hello,

The question require us to calculate the mass of nitrogen present in aluminium carbonate.

This can easily be calculated using Avogadro's number as a constant with some minor calculations but however in this case, we can't because there's no single atom of nitrogen present in aluminium carbonate hence we can't calculate the mass of nitrogen present in it.

Chemical formula of aluminium carbonate = Al₂(CO₃)₃.

From the above chemical formula, we can see that there's no single atom of nitrogen present in the formula hence the mass of nitrogen present in aluminium carbonate that contains 1.23×10²³ carbon atoms is zero.

To prepare a 0.12 M solution of FeCl₃, the amount of solid FeCl₃ to be dissolved in a given volume of solvent will be 9.72 grams.

Given,

Molarity of FeCl₃ (M)= 0.12 M

The molecular weight (m) of FeCl₃ is  = 162 gm

The volume of the solution (V) to be prepared is =500 ml

The amount of FeCl₃ to be dissolved to make a 0.12 M solution is= x

So,

MV= x ÷ m × 1000

0.12× 500 = x ÷ 162 × 1000

x = 60 × 162 ÷ 1000

x= 9.72 gm

So 9.72 grams of FeCl₃ is dissolved to make 500 ml of 0.12 M solution.

For preparing 0.4 M HCl from 4M HCL:

If we need to make 500 ml of solution with 0.4M of HCL, then we use the formula:

M₁V₁= M₂V₂

0.4 × 500= 4 × x

x= 50 ml

So 50 ml of 4M HCL is taken to make 0.4 M HCL.

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Answer:

In Thomas Cole's painting "The Oxbow," Thomas Cole, the artist, shows himself sitting in the landscape while painting it.

Explanation:

In the painting called "The Oxbow" by Thomas Cole, the artist actually put himself in the picture. He's sitting right in the middle of the landscape, just like he placed himself in the painting, as if taking a selfie while working on it. It's like he took a snapshot of himself while he was working on the painting. This shows how much he cared about creating the artwork and how he felt a personal connection to the beautiful scenery. It's really fascinating because it gives us a glimpse into how he saw himself as an artist and how he wanted to capture the incredible beauty of nature through his art.

Period 2 element would the 4th ionization energy be much larger than the 3rd ionization energy is Boron.

Boron belongs to period second. atomic no. of boron is 5 and the electronic configuration is given as :

B₅  =   1s² 2s² 3p₁

The 1st ionization energy = 800.6

the 2nd ionization energy = 2427.1

the 3rd ionization energy = 3659.7

the 4th ionization energy = 25025.8

So. we can see that the 3rd ionization energy is much lower than 4th ionization energy because after removing the 3rd electron from 2s boron will attain the stable electronic configuration of helium. now to remove electron from filled orbital it will require much larger energy the 3rd ionization energy.

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The type of crude oil that is considered to be the highest quality for gasoline is West Texas Intermediate (Option B).

Oil is a fossil fuel obtained from Earth's crust, which is fundamental nowadays to generate electricity.

West Texas Intermediate is a highly pure and high-type energy source of crude oil used in industry.

In conclusion, the type of crude oil that is considered to be the highest quality for gasoline is West Texas Intermediate.

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The statement that in an acidic solution, the hydroxide ion concentration is lesser than the hydronium ion concentration, and vice versa in basic solution is true.

Acidic solutions are classified as acids due to low pH and high concentration of hydronium ions. Hence, in acidic solutions, the concentration of hydronium ions is greater than that of hydroxide ions. The compounds or solutions are classified as bases and acids depending upon the level of hydronium or hydroxide ions.

An acidic solution possesses a lower pH while a basic solution has a higher pH value.The hydronium ion is an important factor when dealing with chemical reactions that occur in aqueous solutions. Its concentration relative to hydroxide is a direct measure of the pH of a solution. The pH of a solution depends on its hydronium concentration.

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1. Water begins to boil - Endothermic

2. Fireworks explode - Exothermic

3. Sweat evaporates cooling your skin - Endothermic

4. Water begins to freeze into ice - Exothermic

5. You ignite your homework assignments once the year is over - Exothermic

6.Sunrays burn your skin - Exothermic

7.Cellular respiration - Exothermic

Exothermic and endothermic refer to two types of chemical reactions or physical processes that release or absorb energy, respectively.

Exothermic reactions release energy in the form of heat, light, or sound. When these reactions occur, they produce a net release of energy into the surroundings, which can often be felt as an increase in temperature. Examples of exothermic reactions include combustion, oxidation, and many types of explosions.

Endothermic reactions, on the other hand, absorb energy from the surroundings in order to proceed. These reactions typically feel cold to the touch and require energy to be added to the system in order to occur. Examples of endothermic reactions include melting, evaporation, and many types of chemical reactions that require heat to be added in order to proceed.

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Answer:

78 : 71

Explanation:

From the question given above, the following data were obtained:

Mass of KCl = 149 g

Mass of K = 78 g

Mass ratio of K and Cl =?

Next, we shall determine the mass of Cl in the compound. This can be obtained as follow:

Mass of KCl = 149 g

Mass of K = 78 g

Mass of Cl =?

Mass of Cl = (Mass of KCl) – (Mass of K)

Mass of Cl = 149 – 78

Mass of Cl = 71 g

Finally, we shall determine the mass ratio of K and Cl. This can be obtained as follow:

Mass of K = 78 g

Mass of Cl = 71 g

Mass ratio of K and Cl =?

Mass ratio = mass of K / mass of Cl

Mass ratio = 78 / 71

Therefore, potassium, K and chlorine, Cl are released in mass ratio of 78 : 71

Explanation:

7. the group of elements that are poor conductors of electricity and heat

nonmetal

Answer:

Voltage is the measure of electric potential energy per unit charge, current is the flow of electric charge through a circuit, and resistance is the property of a material that opposes the flow of electric current.

Ohm's Law relates these three concepts by stating that current is directly proportional to voltage and inversely proportional to resistance.

Hope this helps!

Answer:

1,095 x 2= $2,190

year= 365 days  

day= 1 day  

1 day = $2.00

i knew that 1 year was 365 I so i did 365x3 to get 1,095 x 2 to get how much i would spent in 3 years to get 2,190

Explanation:

cool

Answer:

Number of moles   = 0.75 mol

Mass = 118.5 g

Explanation:

Given data:

Number of moles of KMnO₄ = ?

Mass in gram = ?

Molarity of KMnO₄ = 0.25 M

Volume of KMnO₄ solution = 3 dm³ (3 L)

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles  / L of solution

0.25 M = number of moles / 3 L

Number of moles   = 0.25 M× 3 L

            M = mol/L

Number of moles   = 0.75 mol

Mass in gram:

Mass = number of moles × molar mass

Mass = 0.75 mol × 158 g/mol

Mass = 118.5 g

Rounding to the appropriate number of significant figures, the equilibrium constant (Kc) for the reaction is approximately 1.66.

To calculate the equilibrium constant (Kc) for the given reaction, we can use the formula:

Kc = ([H2]^3 * [N2]) / [NH3]^2

Plugging in the given equilibrium concentrations, we have:

Kc = (0.470^3 * 0.800) / (0.250^2)

Calculating the numerator:

(0.470^3 * 0.800) = 0.1037032

Calculating the denominator:

(0.250^2) = 0.0625

Now, dividing the numerator by the denominator:

Kc = 0.1037032 / 0.0625 = 1.6592512

The equilibrium constant represents the ratio of the concentrations of products to reactants at equilibrium. In this case, the equilibrium constant is greater than 1, indicating that the products (H2 and N2) are favored at equilibrium. This means that the forward reaction is favored, leading to the formation of more products compared to reactants.The equilibrium constant value of 1.66 suggests that the forward reaction is moderately favored at equilibrium, but without additional context, it is difficult to determine the extent of the reaction or the relative concentrations of reactants and products at the beginning of the reaction.

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Answer:

21.9102g

Explanation:

mass = 28.09 × 0.78

         = 21.9102g

Answer:

i think its 7.4

Explanation:j

dgctfvybhuinjok;l,'

Answer:0.226 gram

Explanation:you can get the answer in two steps calculate 3.40 . 10^22 atoms =

Answer:

4.2 × 10²² ÷ 6.022× 10²³

4.2 × 10²² equals 0.069 moles (approx)

weight of 1 mole of iron = 56g

therefore, 0.069 moles = 56 × 0.069 = 3.9 g

Sorry for lazy work.. :P

Chemistry => Chemical Reactions => Balancing equations

We have a synthesis reaction, two compounds are linked to form one.

To balance the equation we must start by counting the atoms of each element on both sides of the reaction.

We have 2 atoms of Br on the reactants and 1 atom of Br on the products. We write coefficient 2 on KBr to have the same number of Br atoms.

Now, we continue with the K atom. We write coefficient 2 on K molecule in order to have the same number of K atoms. We will have:

Now, the equation is balanced.

Answer: 2K + Br2 → 2KBr

A quasar is a star that emits intense radio and light energy.

A quasar is an extremely bright radio source. It is called a quasi-stellar radio source. It appears to be like a star but is not a star. These quasars are young galaxies that are located far away from us and are highly luminous. The luminosity of a quasar is 1000 times greater than the luminosity of a milky way galaxy.

A quasar is powered by a supermassive black hole with its mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous accretion disc.

The quasars were first discovered in the 1950s using the Hubble space telescope and were found to be a massive bright source emitting radio waves of unknown origin. But now, millions of quasars were discovered.

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The nucleus of an atom is positively charged and contains most of the mass if the atom.

An atom is the smallest particle of a an element that can take part in a chemical reaction.

Atoms are made up of other smaller sub-particles which are:

The protons and neutrons are found in the nucleus of an atom

The electrons are found regions around the nucleus.

Due to the positive charge of the protons, the nucleus of an atom are positively charged and is massive.

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Answer:

1.279e-7

Explanation:

The oxidation and reduction half reactions are

Mg(s) → Mg²⁺(aq) + 2e⁻

and

Ni²⁺(aq) + 2e⁻ → Ni(s)

respectively

From the question, we are to write the half reactions for the oxidation and reduction taking place

The given reaction is

Mg(s) + NiSO₄(aq) → MgSO₄(aq) + Ni(s)

To write the oxidation and reduction half reactions, first we will write the ionic equation for the reaction.

The ionic equation for the reaction is

Mg(s) + Ni²⁺(aq) → Mg²⁺(aq) + Ni(s)

Recall:

Oxidation is the loss of electron(s) while reduction is the gain of electron(s)

Therefore,

The oxidation half reaction is

Mg(s) → Mg²⁺(aq) + 2e⁻

and the reduction half reaction is

Ni²⁺(aq) + 2e⁻ → Ni(s)

Hence, the oxidation and reduction half reactions are

Mg(s) → Mg²⁺(aq) + 2e⁻

and

Ni²⁺(aq) + 2e⁻ → Ni(s)

respectively.

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Answer:

A physical property of a solid used to describe its surface is surface roughness. Surface roughness refers to small, irregular deviations on the surface of a solid that affect its appearance, performance, and ability to interact with other surfaces or materials. It is typically measured in terms of the average height of the surface deviations, known as the root mean square (RMS) height, or the maximum height of the deviations, known as the peak-to-valley height. Surface roughness can be caused by a variety of factors, such as manufacturing processes, wear and tear, and exposure to the environment. Some common ways to measure surface roughness are profilometry, stylus instrument and optical profiler.