Electron Dot Structures

Draw the electron dot structures for the following elements:

Magnesium (Mg)


Lithium (Li)


Argon (Ar)


Carbon (C)


Sulfur (S)


Helium (He)


Aluminum (Al)


Nitrogen (N)


Silicon (Si)


Hydrogen (H)


Calcium (Ca)


Neon (Ne)


Potassium (K)


Boron (B)


Chlorine (Cl)

Answer:

fungi

Yeasts are eukaryotic organisms that are included in a group of organisms called “fungi,” which also includes molds and mushrooms. Yeasts can have both positive and negative effects on fermented products consumed by humans and animals.

Explanation:

Answer:  Fungi

Explanation:

Yeasts are eukaryotic organisms that are included in a group of organisms called “fungi,” which also includes molds and mushrooms. Yeasts can have both positive and negative effects on fermented products consumed by humans and animals.

Answer:

did you get the answer???

Explanation:

I really need help

Answer:

6 moles

Explanation:

You have a 1:3 ratio between nitrogen gas and hydrogen gas

The phase of energy metabolism that often begins with the sight, the smell, or even the thought of food is the cephalic phase.

The cephalic phase is the initial stage of digestion and energy metabolism that occurs before food even enters the body. It involves the sensory stimulation of the brain through visual, olfactory, and cognitive cues associated with food.

When we see, smell, or think about food, our brain sends signals to the digestive system, triggering the release of enzymes and hormones that prepare the body for food intake. This phase includes processes such as increased salivation, gastric acid secretion, and pancreatic enzyme release.

The cephalic phase plays a crucial role in preparing the body for efficient nutrient digestion and absorption, ultimately contributing to overall energy metabolism.

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Solid lead nitrate is heated and forms solid lead oxide, gaseous nitrogen dioxide, and oxygen then it form of decomposition reaction

Lead nitrate is a white color inorganic powder with the chemical formula Pb ( NO₃)₂ when Lead nitrate decomposes it produces Lead oxide a yellow colored oxide of  brown colored Nitrogen dioxide gas, and colorless Oxygen gas and also it gives yellow colors

When lead nitrate is heated it decomposes to form lead oxide, nitrogen dioxide and oxygen from the reaction, we can see that lead nitrate decomposes on heating and forms lead oxide, nitrogen dioxide and oxygen thus, lead nitrate on decomposition gives lead oxide, nitrogen dioxide and oxygen and the lead nitrate and when solid lead nitrate heated it decomposes to produce light yellow solid lead monoxide, reddish-brown nitrogen dioxide gas and colourless oxygen gas

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Answer:

The order of a chemical reaction is determined by the rate law equation, which describes the relationship between the rate of a reaction and the concentrations of the reactants. The order of the reaction with respect to a given reactant is determined by the exponent of its concentration term in the rate law.

The order of a reaction can change depending on the specific conditions of the reaction, including the presence of other reactants or catalysts. Therefore, it is possible for the order of a crystal violet solution mixed with sodium hydroxide to be different than the order of the crystal violet solution alone.

Without further information, it is not possible to definitively say whether the crystal violet solution mixed with sodium hydroxide is second order or not. However, it is possible that the presence of sodium hydroxide could affect the rate of the reaction and alter the order of the crystal violet solution. A more detailed investigation would be needed to determine the order of the reaction under these specific conditions.

Answer:

Al^3+;Al

Explanation:

When a metal ion is formed, the corresponding ion is smaller than the atom from which it was formed.

Oftentimes, the formation of a metal ion leads to the loss of an entire shell. The reduces the ionic radius compared to the atomic radius. Hence the metal ion is always much smaller than the metal atom.

Answer:

75% will have long legs and 25% will have short legs

Explanation:

The rearrangement of 1,5-dienes involves the movement of a double bond to create a new arrangement of atoms. This rearrangement can occur through different mechanisms, such as sigmatropic rearrangements or electrocyclic reactions.

Here are a few examples of 1,5-diene rearrangements:

Claisen rearrangement: In the Claisen rearrangement, a 1,5-diene undergoes a [3,3]-sigmatropic rearrangement to form a new carbonyl compound. An example of this rearrangement is the conversion of allyl vinyl ether to allyl acetate:

CH2=CH-CH2-O-CH=CH2 --> CH2=CH-CO-O-CH2-CH3

Cope rearrangement: The Cope rearrangement involves the intramolecular rearrangement of a 1,5-diene to form a new conjugated system. An example is the conversion of 1,5-hexadiene to 1,3,5-hexatriene:

CH2=CH-CH2-CH=CH-CH2-CH3 --> CH2=CH-CH=CH-CH=CH2

Claisen and Cope rearrangement combination: In some cases, a 1,5-diene can undergo a combination of Claisen and Cope rearrangements. An example is the conversion of 1,5-cyclooctadiene to 1,3,5-cyclooctatriene:

CH2=CH-CH2-CH=CH-CH2-CH=CH2 --> CH2=CH-CH=CH-CH=CH-CH=CH2

Regarding the photolysis of 3-methyl-5-phenyl dicyanomethylene cyclohexenes, the specific products will depend on the reaction conditions and the nature of the substituents. Photolysis can lead to various photochemical reactions, such as bond cleavage, rearrangements, or radical reactions.

the rearrangement of 1,5-diene via examples are mentioned.

Without more specific information, it is difficult to determine the exact products of the photolysis reaction.

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Answer:

Ca + AgNO3 ---> Ca(NO3)2 + Ag

Calcium + silver nitrate ---> Calcium nitrate + silver

also ...reaction type is Single displacement reaction .

hope this answer's your question.

Explanation:

So 2 moles of carbon reacts with 2 moles of oxygen to produce 2 moles of CO2.

A mole of CO2 molecules (we usually just say “a mole of CO2”) has one mole of carbon atoms and two moles of oxygen atoms. The atom ratio and the mole ratio of the elements are identical! 1-).

1 mole of CO2 = 1 × 12 + 2 × 16 = 44 g. 2 mole of CO2 = 2 × 44.0 = 88.0 g.

The result of the experiment caused Rutherford to conclude that the atom mostly was made of the empty spaces and had a positively charged nucleus in it.

Rutherford assaulted extremely thin sheets of gold foil with swiftly moving alpha (∝) particles, along with his colleagues Hans Geiger and Ernest Marsden. Positively charged alpha particles have a mass that is around four times that of a hydrogen atom.

The majority of the alpha-particles, they discovered, were undeflected, and only a small percentage were bounced off the gold foil at extremely enormous angles. Some were even sent back in the direction of the source.

Rutherford thought about these findings and came to the following conclusion: The fact that the majority of alpha particles passed straight through the foil is proof that the atom is primarily made up of empty space. It was determined that there is a concentration of positive charge in the atom based on the small number of alpha particles that were deflected at large angles.

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Answer:

Niels Bohr

Explanation:

No. of moles of gas is constant at combined gas law and pressure, temperature and volume is variable.

Gas laws tells about the behavior and characteristics of gas at different conditions.

According to this law at constant pressure, volume of the gas is directly proportional to the temperature of the gas, and it is represent as:

V ∝ T or V = kT, where k = gas constant.

According to this law pressure of the gas is directly proportional to the temperature of the gas, and it is represent as:

P ∝ T or P/T = k, where k = gas constant.

According to this law at constant temperature, pressure of the gas is inversely proportional to the volume of the gas, and it is represent as:

P ∝ 1/V or PV = k, where k = gas constant.

Combined gas law is the combination of all three above laws at constant moles of gas and it is represented as:

PV/T = k.

Hence, pressure and temperature is variables at Gay Lussac's Law.

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Answer:

c

Explanation:

a. Molten KCl: The products formed are elemental potassium (K) at the cathode and chlorine gas (\(Cl_2\)) at the anode.

b. Aqueous KCl: The products formed are hydrogen gas (\(H_2\)) or potassium (K) at the cathode, chlorine gas (\(Cl_2\)) at the anode, and potassium hydroxide (KOH) if water is present in the solution.

a. When molten KCl (potassium chloride) is electrolyzed with inert electrodes, the products formed are potassium (K) metal and chlorine (Cl₂) gas. The overall reaction can be represented as:

2KCl (l) -> 2K (l) + Cl₂ (g)

In this case, the electrolysis of molten KCl results in the decomposition of the compound into its elements, with potassium being reduced at the cathode (negative electrode) and chlorine being oxidized at the anode (positive electrode).

b. When aqueous KCl (potassium chloride) is electrolyzed with inert electrodes, the products formed are hydrogen (H₂) gas and chlorine (Cl₂) gas. The overall reaction can be represented as:

2H₂O (l) -> 2H₂ (g) + O₂ (g)

However, since the electrolyte is KCl, the presence of chloride ions (Cl⁻) allows for another reaction to occur:

2Cl⁻ (aq) -> Cl₂ (g) + 2e⁻

Hence, the resulting products are hydrogen gas evolving at the cathode and chlorine gas evolving at the anode. The reduction of hydrogen ions (H⁺) to form hydrogen gas is preferred over the reduction of potassium ions (K⁺), while the oxidation of chloride ions (Cl⁻) to form chlorine gas occurs at the anode.

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Answer:

Probably because there is more helium to burn. After billions of years there's only gonna be helium so no more of that firey energy.

I think....

Answer:

B and I think A but you may want a secon opinion on that

Explanation:

I know that electrons are shared with covalent bonds so I assume the 2 answers are the ones with electrons it them

The following changes affect the value of the equilibrium constant for a gas-phase exothermic reaction:

Addition of a catalyst-  Increase equilibrium constant

Decrease in the temperature - Decrease equilibrium constant

Removal of a product- No effect on equilibrium constant

Decrease in the volume- Decrease equilibrium constant

Removal of a reactant- Decrease equilibrium constant

Define  exothermic process

An exothermic process in thermodynamics is a thermodynamic process or reaction that releases energy from the system to its surroundings, typically in the form of heat but occasionally in the form of light (such as a spark, flame, or flash), electricity (such as from a battery), or sound (such as the explosion produced by the burning of hydrogen).

The relationship between a reaction's products and reactants with regard to a certain unit is expressed by the equilibrium constant, K. The equilibrium constant is temperature-dependent and unaffected by the precise ratios of reactants to products, the presence of a catalyst, or the presence of inert substances. Additionally, it is unaffected by the volumes, pressures, and concentrations of the reactants and products.

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The ion which will combine with sulfide in a 2:1 ratio is Choice B: Ammonium.

The sulfide ion is negatively charged and needs two electrons to complete it's octet;

In essence, it needs two positive charges.

However, since the question asks Which ion will combine with sulfide in a 2:1 ratio.

The ion is ammonium ion; NH4+

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Answer:

If its windy it will fly away. If its not windy I think it will float down to the ground

Explanation:

Answer:

1,2,3,4,8,9,10,12,14,15 and 16

Explanation:

Coz they have different kinds (colours) of atoms

The rest are pure substances,

I'm not so sure though, double check after this

Answer:

The skin

Explanation:

The skin is the largest organ of the body. The skin and its derivatives (hair, nails, sweat and oil glands) make up the integumentary system. One of the main functions of the skin is protection. It protects the body from external factors such as bacteria, chemicals, and temperature.

P,T,Y refers to the set of points which are collinear and is therefore denoted as option C.

This is commonly used in geometry and refers to the set of points which lie on the same straight line and are always close to each other when compared to other points. It is possible for them to appear on different planes only and the value by the triangle from the three points is usually zero.

In the example give, only P,T and Y are the points which lie on the same line while other options have points which lie on different lines thereby making them incorrect.

This is therefore the reason why option C was chosen as the most appropriate choice.

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Boric acid is a monoprotic and Lewis acid. B(OH)\(_3\) + H\(_2\)O ⇌ [BO(OH)\(_2\)]− + H\(_3\)O+ and HBO\(_2\) + H\(_2\)O ⇌ [BO\(_2\)]− + H\(_3\)O+ are the reactions for ionisation of boric acid.

In particular, orthoboric acid is a boron, oxygen, plus hydrogen chemical having the formula B(OH)3. Trihydroxidoboron, hydrogen orthoborate, and boracic acid are other names for it. It occurs naturally as the substance known as sassolite and is typically found as colourless crystals.

A white powder that dissolves in water. It is a weak acid that can react using alcohols to produce borate esters as well as a variety of borate anions and salts. Boric acid is a monoprotic and Lewis acid. B(OH)\(_3\) + H\(_2\)O ⇌ [BO(OH)\(_2\)]− + H\(_3\)O+ and HBO\(_2\) + H\(_2\)O ⇌ [BO\(_2\)]− + H\(_3\)O+ are the reactions for ionisation of boric acid.

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An object possesses a density of 2.780 g/mL. and the mass of the object is 0.896 grams, the volume, in of the object in mL is  (A) 0.3223 mL

To calculate the volume of an object, we can use the formula:

Volume = Mass / Density

Given that the mass of the object is 0.896 grams and the density is 2.780 g/mL, we can substitute these values into the formula:

Volume = 0.896 g / 2.780 g/mL

By performing the division, we find:

Volume = 0.3223 mL

So, the volume of the object is 0.3223 mL.

Therefore, the correct answer is (A) 0.3223 mL.

It's important to note that the volume is expressed in milliliters (mL) since the density is given in grams per milliliter (g/mL). The calculation involves dividing the mass (in grams) by the density (in g/mL), resulting in the volume in milliliters.

Understanding and applying the formula for calculating volume using mass and density helps us determine the physical space occupied by an object based on its characteristics. Therefore, Option A is correct.

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Answer:

Atoms and molecules are matter

Explanation:

Matter is anything that have mass and occupies space

Launching a projectile over a significant distance, such as several hundred miles, presents a range of complex challenges that must be carefully addressed. The success of achieving such a long range relies on accounting for various factors that influence the projectile's trajectory, including aerodynamics, atmospheric conditions, Earth's curvature, and external forces.

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Answer:

makwe me brainliest pls hope it helps;)

Explanation:

Neutrons are electrically neutral, but contribute to the mass of a nucleus to nearly the same extent as the protons. Neutrons can explain the phenomenon of isotopes (same atomic number with different atomic mass). The main role of neutrons is to reduce electrostatic repulsion inside the nucleus

1) The 95% confidence interval for k₁ is approximately 1.542 to 2.258.

2) The correlation between k₁ and k₂ is approximately 0.094.

3) The AIC value for the first model is approximately -991.224 and for the second model is approximately -979.218. The second model provides a better fit for the data.

To solve the given questions, we can follow the following steps:

1) Compute a 95% confidence interval for k₁:

The 95% confidence interval for a parameter estimate is given by:

CI = k₁ ± t_(α/2,n-2) * SE(k₁),

where t_(α/2,n-2) is the critical value from the t-distribution with n-2 degrees of freedom (n = number of data points), and SE(k₁) is the standard error of the parameter estimate.

From the error-covariance matrix C, the standard error of k₁ can be obtained as SE(k₁) = √(C₁₁/N), where C₁₁ is the (1,1) element of matrix C, and N is the number of data points.

Plugging in the values:

SE(k₁) = √(1.6/50) ≈ 0.17889

The critical value t_(α/2,n-2) for a 95% confidence interval with 50 data points (n = 50) and α = 0.05 (two-tailed test) can be obtained from the t-distribution table or statistical software. Let's assume it to be t = 2.0096.

Therefore, the 95% confidence interval for k₁ is:

CI = 1.9 ± 2.0096 * 0.17889

Calculating the upper and lower limits of the confidence interval:

Upper limit = 1.9 + 2.0096 * 0.17889

Lower limit = 1.9 - 2.0096 * 0.17889

2) Compute the correlation between k₁ and k₂:

The correlation coefficient between two parameters can be calculated using the formula:

ρ(k₁, k₂) = C₁₂ / √(C₁₁ * C₂₂),

where C₁₂ is the (1,2) or (2,1) element of matrix C, C₁₁ is the (1,1) element, and C₂₂ is the (2,2) element.

Plugging in the values:

ρ(k₁, k₂) = 0.08 / √(1.6 * 0.9)

3) Compute Akaike Information Criterion (AIC) values for both models:

AIC is calculated using the formula:

AIC = 2k - 2ln(L),

where k is the number of parameters in the model, and L is the likelihood function.

For the first model with 2 parameters and a residual sum of squares (RSS) equal to 500, the AIC value can be calculated as:

AIC₁ = 2 * 2 - 2 * ln(500)

For the second model with 4 parameters and a RSS equal to 490, the AIC value can be calculated as:

AIC₂ = 2 * 4 - 2 * ln(490)

Comparing the AIC values, the model with the lower AIC value provides a better fit for the data.

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