I NEED UR HELP WITH THIS ILL MARK U AS BRAINLIST/5 star and a like. Just answer the ones u know I’ll still mark u as brainlist and also put numbers on the side so I know which is which, let’s see who can answer em with full sentences.

1. A potassium atom contains 19 protons:
A) how many electrons are present in a potassium atom? Justify your answer.
b) What is the electronic configuration of a potassium according to the Bohr model?
C) how many electrons are in the valence shell of a potassium atom?
D) what could be done to potassium atoms to make electrons jump into the fifth shell?

Answer:

Pretty sure its C.

Explanation:

Carbon dioxide is known for trapping heat in the Earth's atmosphere so this makes sense.

Hope this helped!

The type of clothe that you would wear when visiting the mesosphere are the winter clothes.

Mesosphere is used to describe the coldest part of the earth whose temperature is -85°C.

An individual that wants to visit such a cold area should wear clothes that would provide such with warmth such as the winter clothes.

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Answer:

C. Agricultural runoff

Explanation:

sorry  if not helps if do im am sooooo happy

Answer:

0.85 Molar Na2O

Explanation:

Determine the moles of sodium oxide, Na2O, in 10 grams by dividing by the molar mass of Na2O (61.98 g/mole).

 (10 g Na2O)/(61.98 g/mole) = 0.161 moles Na2O.

Molar is a measure of concentration.  It is defined as moles/liter.  A 1 M  solution contains 1 mole of solute per liter of solvent.  [200 ml water = 0.2 Liters water.]

In this case, we have 0.161 moles Na2O in 0.200 L of solvent.

 (0.161 moles Na2O)/(0.200 L) = 0.85 Molar Na2O

Explanation:

Hi,

The number of protons is equal to the atomic number. The number of electrons in a neutral atom is equal to the number of protons. So, in this case, you have 72 protons and 72 electrons.

I hope this helps :)

If an element has the atomic number 72, then the number of protons is also equal to 72. As it is clearly mentioned in the question that it is a neutral atom, which means the number of protons is equal to the number of electrons which is also 72.

An atomic number may be defined as the number of a chemical element in the modern periodic table through which the elements are systematically arranged in order of increasing the number of protons in the nucleus.

According to the context of this question, the atomic number of every element is always equal to the number of protons it has. While in a neutral atom, the number of electrons is equal to the number of protons. For calculating the number of neutrons, you have to subtract the atomic number from the atomic mass.

Therefore, there are 72 protons of an element whose atomic number is 72. The number of electrons is also 72.

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(a) The appropriate hypotheses for testing if the police officers appear to have been exposed to a higher concentration of lead are:

Null hypothesis (H0): The average blood lead concentration of police officers is equal to or lower than the average blood lead concentration of the group in the previous study.

Alternative hypothesis (Ha): The average blood lead concentration of police officers is higher than the average blood lead concentration of the group in the previous study.

(b) The conditions necessary for inference on these data include:

Random sampling: Assumed as the police officers were selected from a group subjected to constant inhalation of car exhaust fumes.

Independence: Each police officer's blood sample is assumed to be independent of others.

Normality: The sample size is large enough for the Central Limit Theorem to apply.

No extreme outliers or skewness in the data.

(c) By conducting a hypothesis test, if the p-value is sufficiently small (below the significance level), it can be concluded that the downtown police officers have a higher lead exposure than the group in the previous study. The interpretation of the results should be done in context and considering the specific significance level chosen.

(d) Without performing a calculation, it is reasonable to expect that a 99% confidence interval for the average blood concentration level of police officers would not contain 35 ug/l since the alternative hypothesis suggests that the police officers have a higher lead exposure.

(a) The hypotheses for testing if the police officers have been exposed to a higher concentration of lead can be stated as follows:

Null hypothesis (H0): μ ≤ 35 ug/l (The average blood lead concentration of police officers is equal to or lower than the average blood lead concentration of the group in the previous study).

Alternative hypothesis (Ha): μ > 35 ug/l (The average blood lead concentration of police officers is higher than the average blood lead concentration of the group in the previous study).

(b) The conditions necessary for inference on these data are:

Random sampling: The blood samples are collected from police officers subjected to constant inhalation of car exhaust fumes while working traffic enforcement. Assuming the sampling process was random.

Independence: It is assumed that each police officer's blood sample is independent of others, meaning one officer's lead concentration does not influence another's.

Normality: The sample size of 52 police officers is relatively large, so the Central Limit Theorem can be applied, assuming the blood lead concentration data follows a normal distribution. Additionally, no extreme outliers or significant skewness should be present in the data.

(c) To test the hypothesis, a t-test or a z-test can be performed, depending on the sample size and whether the population standard deviation is known or estimated from the sample. By comparing the test statistic to the appropriate critical value or by calculating the p-value, it can be determined if the downtown police officers have a significantly higher lead exposure than the group in the previous study. The interpretation of the results should be done in context, considering the chosen significance level and the potential implications of the findings for the health and safety of the police officers.

(d) Without performing a calculation, it can be inferred that a 99% confidence interval for the average blood concentration level of police officers would not contain 35 ug/l. Since the alternative hypothesis suggests that the police officers have a higher lead exposure, the confidence interval is more likely to be centered around the estimated average lead concentration of 124.32 ug/l, indicating a higher value than 35 ug/l.

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The plastic container is likely to impact the integrity of the evidence i.e. a sample of DNA based on this storage method.

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Answer:

What is a concentrated solution?

Concentrated solution is a solution that contains a large amount of solute relative to the amount that could dissolve.

xXxAnimexXx

Happy Labor day!

Answer:

6

Explanation:

The equation given in this question is:

H₂ + N₂ ---> NH₃

To balance this equation i.e to make sure that the number of atoms on each side of the equation is the same, one would make use of coefficients.

The balanced equation is:

3H₂ + N₂ ---> 2NH₃

The coefficients are the number behind each element or molecule. According to this question, the sum of each coefficient is 3 + 1 + 2 = 6

Answer:

Using cobalt glass could be helpful to identify elements that weakly emit blue and/or violet.

Explanation:

Molality of sulfuric acid is 1.1.

As we know that density of solution = 1.509 = mass of solution \ Volume.

10% of \(H{_2}SO_4\) by mass,

\(\frac{10}{100} \times 1.509\) v (g)

As the mass of solvent \(=\frac{90}{100}\times 1.509 V(g)\)

98 g of \(H{_2}SO_4\) contains moles = 1,

\(\frac{10 \times 1.509 V g}{100}\) of \(H{_2}SO_4\) contains moles = \(\frac{1.509 .v}{10 \times 98}\) moles

Molality = moles of solute/ Mass of solvent (kg)

             =\(\frac{1.509 \times 100 \times 1000}{10 \times 98 \times 1.509 .V (kg)}\)

             = 1.1

Hence, the Molality of sulphuric acid is 1.1.

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The new volume of the balloon will be determined by the Ideal Gas Law.

The Ideal Gas Law is a mathematical equation used to describe the behavior of an ideal gas under a given set of conditions. It states that, at a constant temperature and pressure, the pressure, volume and amount of gas present are all directly proportional.

This law states that the product of the pressure, volume, and temperature of a gas is a constant.
Since the pressure of the balloon remains constant, the new volume is inversely proportional to the temperature.
Therefore, the new volume can be calculated by dividing the original volume (13.5 liters) by the ratio of the original temperature (248 K) to the new temperature (324 K),
which is 248/324 = 0.76.
The new volume of the balloon is then 13.5 liters / 0.76 = 17.76 liters.

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The intermolecular forces listed in the answer options are ion-dipole, hydrogen bonding, dipole-dipole, and Van der Waals forces, listed from strongest to weakest.

Ionic bonding is stronger than all of the intermolecular forces mentioned, yet it is not an intermolecular force in and of itself. The strength of the London force will vary greatly if the molecules have highly differing molar masses (by a factor of 2 or more). In this situation, the one with the significantly higher molar mass will have stronger overall intermolecular forces. An electronegative atom on a second molecule is drawn to a hydrogen atom on a first molecule. The characteristics of substances are influenced by intermolecular forces. Larger molecules have stronger intermolecular forces than smaller molecules do.

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A. Inattentional blindness is how we can miss things even if they are clearly visible.

Inattentional blindness is failing to see objects when our attention is directed elsewhere.

A person experiences inattentional blindness or perceptual blindness (occasionally referred to as inattentive blindness) when they are unable to recognize an unexpected stimulus that is right in front of them without the aid of vision problems or deficiencies.

We all occasionally suffer from inattentional blindness, which might occur in the following circumstances: You believe you are paying attention to the road, but you miss the automobile swerving into your lane of traffic because you were distracted, which leads to a collision. You are taking in a historical drama with a Greek setting.

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The amount of heat that is needed to change 250.0 grams of water at 80°C to steam at 100°C is 20900 J of heat.

Heat change is the amount of heat that must be added or that is evolved when a particular change occurs in a substance.

The amount of heat required is determined from the formula of heat given below as follows:

Heat change = mass * specific heat capacity * temperature change

Heat required = 250 * 4.18 * (100 - 80)

Hee=at required = 20900 J

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The mass of Al₂S₃ in kg required is 2815.28 kg

The percentage mass of a substance is the ratio of the substance in a given substance to that of the total mass of the substance expressed as  a percentage.

The percentage mass of aluminum in Al₂S₃ is calculated as follows:

Molar mass of Al = 27 f

Molar mass of Al₂S₃ = 150 g/mol

Percentage mass of Al = 27/150 * 100%

Percentage mass of Al = 18%

Mass of Al₂S₃ required is calculated with the formula:

Mass of Al₂S₃ = mass of Al * 100/percentage mass of Al

Mass of Al₂S₃ = 506.75 * 100/18

Mass of Al₂S₃ = 2815.28 kg

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Answer:

Sodium hydroxide is very corrosive. It can cause irritation to the eyes, skin, and mucous membrane; an allergic reaction; eye and skin burns; and temporary loss of hair. Workers may be harmed from exposure to sodium hydroxide.

Explanation:

How to reduce:

Inhalation: Move victim to fresh air.

Skin Contact: Avoid direct contact

Eye Contact: Avoid direct contact

Ingestion: Have victim rinse mouth with water.

1) The sun is a stat that is located in the middle of the solar system.

2) It gets squeezed together so lightly that four hydrogen nuclei combine to firm form helium atom. This is called nuclear fusion.

3) Solar flares, coronal mass ejection, high-speed solar wind and solar energetic particles.

Stars

All the elements on earth have been cooked from billions of years in stars and the released in the universe through super-nova explosions

Keq = ([CaO][CO\(_2\)]²[H\(_2\)]) / ([CaCO\(_3\)][CO][H\(_2\)O]) is the equilibrium expression for keq for the reaction.

When a chemical reaction reaches equilibrium, the equilibrium constant sheds light on the interaction between the reactants and products. For instance, the ratio of the concentration of the products to the concentration of the reactants, each raised to their respective stoichiometric coefficients, can be used to calculate the equilibrium constant of concentration of a chemical process at equilibrium. The existence of several forms of equilibrium constants that establish relationships between the reactants and products of equilibrium reactions in terms of various units is significant to notice.

Keq = ([CaO][CO\(_2\)]²[H\(_2\)]) / ([CaCO\(_3\)][CO][H\(_2\)O])

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Answer:

phosphorous

Explanation:

A necessary prerequisite to the construction of the periodic table was the discovery of the individual elements. Although elements such as gold, silver, tin, copper, lead and mercury have been known since antiquity, the first scientific discovery of an element occurred in 1649 when Hennig Brand discovered phosphorous.

Answer:

those things that looks like cristals

The pH of the compound or substance with the same number of hydroxide and hydrogen ions is 7. The pH 7 is significantly the neutral pH which is the pH of the pure water.

When the number of hydrogen ions (H+)equals the number of hydroxide ions (OH-), a solution is said to be neutral. Acids increase the number of hydrogen ions (H+) in a solution (there are more hydrogen ions than hydroxide ions) and the resulting solution is said to be acidic.

In pure water, at 25C, the [H3O+] and [OH-] ion concentrations are 1.0 x 10-7 M.The overall concentration of hydrogen ions is inversely related to its pH and can be measured on the pH scale. Therefore, the more hydrogen ions present, the lower the pH; conversely, the fewer hydrogen ions, the higher the pH.

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The value of K_eq for this reaction is approximately 1.805 × 10^-5.

To find the value of the equilibrium constant (K_eq) for the given reaction, we can use the equilibrium concentrations of the species involved. The equilibrium constant expression for the reaction is:

K_eq = [CH3COO-][H3O+] / [CH3COOH]

Given the following concentrations at equilibrium:

[CH3COOH] = 2.0 × 10^-1 M

[CH3COO-] = 1.9 × 10^-3 M

[H3O+] = 1.9 × 10^-3 M

Substituting these values into the equilibrium constant expression, we get:

K_eq = (1.9 × 10^-3)(1.9 × 10^-3) / (2.0 × 10^-1)

K_eq = 3.61 × 10^-6 / 2.0 × 10^-1

K_eq = 3.61 × 10^-6 × 5.0 × 10^0

K_eq = 1.805 × 10^-5

Therefore, the value of K_eq for this reaction is approximately 1.805 × 10^-5.

None of the provided answer choices match this value exactly.

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Answer:

Explanation:

Answer: 1.380 × 10^-8 M

The pH is the measure of alkalinity or acidity of a substance.

It is the negative logarithm of H+ ions concentration [H+].

pH = -log[H+]

pOH on the other hand is negative logarith of OH- concentration [OH-].

pOH = -log[OH-]

In this case;

pOH = 7.86

We can calculate the [OH-]

pOH = -log[OH-]

But, pOH = 7.86

pOH = -log[OH-]

-log[OH-] = 7.86

[OH-] = Antilog -7.86

      = 1.380 × 10^-8 M

Therefore, [OH-] is 1.380 × 10^-8 M

A 1200 mL IV drip is labelled to contain 12% of a laxative. The number of mL of the IV drip that should be administered if a patient is to receive 21 mL of the laxative is 175 mL.

To find the number of mL of the IV drip that should be administered to provide 21 mL of the laxative, we can set up a proportion using the concentration of the laxative.

Let x represent the number of mL of the IV drip to be administered.

The concentration of the laxative is given as 12% or 0.12, meaning that in 100 mL of the IV drip, there are 12 mL of the laxative.

Using the proportion:

(12 mL of laxative) / (100 mL of IV drip) = (21 mL of laxative) / (x mL of IV drip)

Cross-multiplying, we get:

12 mL * x mL of IV drip = 100 mL * 21 mL of laxative

12x = 210 IV drip0

Dividing both sides by 12:

x = 2100 / 12

x = 175

Therefore, 175 mL of the IV drip should be administered to provide 21 mL of the laxative.

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Answer:

4) Neon and Argon

Explanation:

Sodium has 11 electrons, Chlorine has 17.

For both of them to complete their shells Sodium will give one electron to chlorine.

Sodium will become 2,8 in the reaction.

Chlorine will become 2,8,8 in the reaction.

2,8 is the electron configuration of Neon.

2,8,8 is the electron configuration of Argon

A homogeneous mixture is one where the components are uniformly distributed throughout the mixture, meaning that you cannot see the different components separately. Out of the options provided, the only substance that fits this description is glucose. The correct answer for your question is option b. Salt water.

Glucose is a type of sugar that dissolves completely in water, making it a homogeneous mixture. Vegetable soup and salt water are both heterogeneous mixtures, meaning that you can see the different components separately, such as chunks of vegetables or grains of salt. Copper wire is a pure substance, not a mixture at all. Therefore, the answer to this question is c. glucose.
A homogeneous mixture is one in which the components are evenly distributed throughout the mixture, resulting in a consistent composition. In the case of salt water, the salt is dissolved evenly in the water, making it a homogeneous mixture. The other options, such as vegetable soup, glucose, and copper wire, are not considered homogeneous mixtures for various reasons.

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