I NEED HELP ASAP what is the difference between an isotopes mass number and an elements atomic mass number?

Answer:

5791

Explanation:

Easy peasy lemon squeazy

Answer:

You are likely a scientist, researcher, or engineer working in the field of household cleaning product development. Your job involves studying and testing various chemical compounds to create more effective and eco-friendly cleaning solutions for consumers.

To improve the formulation of household cleaning products, you would need to have a deep understanding of chemistry and how different chemicals interact with each other. You would also need to be familiar with the latest developments in green chemistry and sustainable manufacturing practices.

In addition to scientific knowledge, you would need to be skilled in project management, data analysis, and communication. You would work closely with colleagues in marketing, sales, and production to ensure that your research aligns with business goals and customer needs.

Overall, your job is critical in ensuring that households have access to safe and effective cleaning products that are also environmentally responsible.

Explanation:

Answer:

acid

Explanation:

7 is neutral if more than 7 add acid if less than 7 add alkali

Answer:NO

Explanation:NO

Answer:

make me brainliest pls :)

Explanation:

Science is both a body of knowledge and a process. In school, science may sometimes seem like a collection of isolated and static facts listed in a textbook, but that's only a small part of the story. Just as importantly, science is also a process of discovery that allows us to link isolated facts into coherent and comprehensive understandings of the natural world.

Science is exciting. Science is a way of discovering what's in the universe and how those things work today, how they worked in the past, and how they are likely to work in the future. Scientists are motivated by the thrill of seeing or figuring out something that no one has before.

Science is useful. The knowledge generated by science is powerful and reliable. It can be used to develop new technologies, treat diseases, and deal with many other sorts of problems.

Science is ongoing. Science is continually refining and expanding our knowledge of the universe, and as it does, it leads to new questions for future investigation. Science will never be "finished."

Science is a global human endeavor. People all over the world participate in the process of science. And you can too!

Answer:

C: 4

H: 1

Mg: 2

O : 6

Explanation:

You can quickly find out the number of valence electrons by looking at where the element is on the periodic table and referring to the table that is attached.

The empirical formula of the compound is CHCl₃, representing 1 carbon, 1 hydrogen, and 3 chlorine atoms.

To determine the empirical formula of a compound, we need to find the simplest whole number ratio of the atoms present.
First, let's convert the masses of each element to moles.
The molar mass of carbon (C) is 12.01 g/mol, hydrogen (H) is 1.01 g/mol, and chlorine (Cl) is 35.45 g/mol.
Moles of carbon = mass of carbon / molar mass of carbon

                           = 5.03 g / 12.01 g/mol

                           = 0.418 moles
Moles of hydrogen = mass of hydrogen / molar mass of hydrogen

                                = 0.42 g / 1.01 g/mol

                                = 0.416 moles
Moles of chlorine = mass of chlorine / molar mass of chlorine

                             = 44.5 g / 35.45 g/mol

                            = 1.256 moles
Next, we need to find the ratio of the moles.
Divide each mole value by the smallest mole value, which is 0.416 moles.
Carbon = 0.418 moles / 0.416 moles

            = 1.005

            ≈ 1
Hydrogen = 0.416 moles / 0.416 moles

                 = 1
Chlorine = 1.256 moles / 0.416 moles

              = 3.02

              ≈ 3
Therefore, the empirical formula of the compound is CHCl₃, representing 1 carbon, 1 hydrogen, and 3 chlorine atoms.

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The mass, in grams, of H₂O is produced in the decomposition of ammonium nitrate is 72.06 grams.

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = required mass

M = molar mass

Given chemical reaction is:

NH₄NO₃ → N₂O + 2H₂O

Moles of 160.1 g of NH₄NO₃ = 160.1g / 80.03g/mol = 2moles

From the stoichiometry of the reaction, it is clear that:

1 moles of NH₄NO₃ = produce 2 moles of H₂O

2 moles of NH₄NO₃ = produce 2×2=4 moles of H₂O

Mass of H₂O will be calculated as:

W = (4mol)(18.01 g/mol) = 72.04 grams (72.06 approx)

Hence, option (4) is correct.

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Explanation

Given:

Mass of copper = 5.07 g

Density of copper = 8.96 g/mL = 8960 g/L

Requested: Volume of copper

Solution

p = m/V where p is the density, m is the mass and V is the volume

m = p x V

V = m/p

V = 5.07 g/8.96 g/mL

V = 0.566 mL

Answer

Volume of copper = 0.566 mL

The molarity of phosphoric acid in a solution labelled 20% of Phosphoric acid by weight and a density of 1.12g/mL is 11.85 mol/L.

What is molarity?

The number of moles of solute divided by the number of liters of solution is the definition of molarity, a concentration unit in chemistry. Molarity is measured in moles per liter (mol/L).

Number of moles of phosphoric acid whose molar mass is 98:

\(Number of moles = \frac{mass}{molar mass}\)

n = 20/98

n = 0.204 mols

\(Volume = \frac{mass}{density }\)

V = 20/1.22

V = 17.85 ml

Molarity is the number of moles of solute per liter of solution.

\(M = \frac{n}{V}\)

Where, M = molarity, V = volume of solvent in liters, n = no. of moles of solute.

So, \(M = \frac{0.204}{17.85} \times \frac{1000}{1}\)

M = 11.85 mol/L

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2. When NaCl is dissolved in water it forms Nat and CL-ions which interact with water with ion-dipole forces of attraction. There exists a sphere of water molecules around respective ions.

Whereas in isopropyl alcohol there exists H- Bonds as well as Ion-dipole forces in these dyes in comparison to those there will

3.) There will exist H bonding in all these dyes along with ion-dipole forces of attraction as well as repulsive forces as well because of nonpolar groups in dyes and polar water molecules but attractiveness will be more than that of repulsive ones.

4. Chromatography papers are generally made up of cellulose which is again a polymer of glucose. Now there exist H bonds between hydroxyl groups of paper that are hydrophilic which means water-loving. polymer and water molecules. Because of this H binds chromatography.

B.  There will exist again hydrogen bonds among dye and chromatogram more will be the attractions between dye and paper lesser will be retention factor it will adsorb more or lesser will go with solvent.

In chromatography, there are also intermolecular forces such as hydrogen bonding and dipole-dipole interactions that help keep the analytes on the stationary phase of the column. The stronger the intermolecular forces, the stronger and longer the compound will be retained on the column. It is a type of planar chromatography that uses cellulose filter paper to act as the stationary phase for the separation of compounds.

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Qualities of a solution known as coagulative qualities rely on the quantity of solute particles present but not on the kind of solute.

Boiling point elevation, osmotic pressure, and vapour pressure depression are a few examples of colligative qualities. Solubility is the response to the query of what is not a collative property.

The amount of a solute that can dissolve in a solvent is known as its solubility, and the solute's type does affect this quantity. Solubility is not a collative quality, then.

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Answer:

The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun.

The deepest layer is a solid iron ball, about 1,500 miles (2,400 kilometers) in diameter. Although this inner core is white hot, the pressure is so high the iron cannot melt.

The iron isn't pure—scientists believe it contains sulfur and nickel, plus smaller amounts of other elements. Estimates of its temperature vary, but it is probably somewhere between 9,000 and 13,000 degrees Fahrenheit (5,000 and 7,000 degrees Celsius).

Above the inner core is the outer core, a shell of liquid iron. This layer is cooler but still very hot, perhaps 7,200 to 9,000 degrees Fahrenheit (4,000 to 5,000 degrees Celsius). It too is composed mostly of iron, plus substantial amounts of sulfur and nickel. It creates the Earth's magnetic field and is about 1,400 miles (2,300 kilometers) thick.

You can get more info, in national geographic.

https://www.nationalgeographic.com/science/article/earths-interior

Lithium alkali metals has the highest electronegativity. An atom's ability to attract the electrons of a bond grows with electronegativity, a feature of an atom.

The electrons in a covalent bond are shared evenly by two bound atoms if their electronegativity levels are the same. Typically, the more electronegative atom attracts the electrons in a chemical bond more so than the other one. Consequently, a polar covalent bond is created. The electrons aren't shared at all if the electronegativity values are significantly dissimilar. Ionic bonds are created when one atom essentially steals the other atom's bond electrons.

Over a period, electronegativity often increases as it moves from left to right. The noble gases frequently defy this rule.

Moving down on the periodic table often results in a decrease in electronegativity.

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Answer: EADCBCEDBA

Explanation:

1.  E - Moderately to very polar covalent

        Electronegativity (χ) = .84

2. A - Nonpolar covalent

        χ = 0 - There is no electronegativity difference

3. D - Ionic

        χ = 3 - The electronegativity is greater than 2

4. C - Very polar covalent

          χ = 1.55

5. B - Moderately polar covalent

         χ = .76

6. C - Very polar covalent

         χ = 1.4

7. E - Moderately to very polar covalent

        χ=.89

8. D - Ionic

       χ= 2.46

9. B - Moderately polar covalent

       χ = .82

10. A- Nonpolar covalent

      χ = 0 - There is no electronegativity difference

hope this helps :3

Answer:

The total mass of mercury in the lake is 631,542.7 kg

Explanation:

Question: The given dimensions of the lake as obtained from a similar question posted online are;

The surface area of the lake, A = 100 mi²

The lake's average depth, d = 20 ft.

The concentration of the mercury, C = 0.4 μg Hg/mL = 0.4 × 10⁻⁶ kg Hg/L

Therefore, we have;

The volume of water mixture in the lake, V = A × d

∴ V = 100 mi² × 20 ft. = 2,787,840,000 ft.² × 20 ft. = 55,756,800,000 ft.³

1 ft³ = 28.31685 L

∴ 55,756,800,000 ft.³ = 55,756,800,000 ft.³ × 28.31685 L/ft.³ = 1.57885675 × 10¹² L

The total mass of mercury in the lake, m = C × V

∴ m = 0.4 × 10⁻⁶ kg Hg/L × 1.57885675 × 10¹² L = 631,542.7 kg

The total mass of mercury in the lake, m = 631,542.7 kg.

Based on the equation of the reaction, nitrogen is the limiting reagent while hydrogen is the excess reagent.

Hydrogen and nitrogen combines to form ammonia ina mole ratio of 3 : 1 as shown by the equation of the reaction below:

The number of moles of the reactants in 14g of Nitrogen gas and 8.0g of hydrogen is calculated as follows:

Molar mass of N_{2} = 14.0 g

Molar mass of H_{2} = 2.0 g

Moles of N_{2} = 14/14.0 = 1 mole

Moles of H_{2} = 8/2.0 = 4 moles

Based on the data above:

Therefore, the limiting reagent is nitrogen while hydrogen is the excess reagent.

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If an IV bag of 500 mL D5W is infusing at a rate of 50 mL/hr, and the IV bag was hung at 11:30 am, the infusion will be complete in 10 hours and 30 minutes.

To determine the time it takes for the infusion to be complete, we need to consider the volume of the IV bag and the infusion rate.

The IV bag contains 500 mL of D5W (5% dextrose in water). The infusion pump is set at a rate of 50 mL/hr, which means 50 mL of the solution is administered every hour.

To find the time it takes for the infusion to be complete, we divide the total volume of the IV bag (500 mL) by the infusion rate (50 mL/hr):

Time = Volume / Rate

Time = 500 mL / 50 mL/hr

Time = 10 hours

Since the IV bag was hung at 11:30 am, we add 10 hours to this time to determine when the infusion will be complete:

11:30 am + 10 hours = 9:30 pm

Therefore, the infusion will be complete at 9:30 pm.

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Answer:

for number one it is the first one. the second one it the third. and number 3 is the second one.

Explanation:

im just realy smart

Answer:

Weight,mass, volume, density

Answer:

Mass, volume, weight, and density.

Explanation:

Answer:

The three events that occur when the Sun, Moon, and Earth line up in a row are

Answer:

production of antibodies

Answer:

C

Explanation:

The body will start to make antibodies to rid of the "invasion".

So the answer is C

While visiting his uncle's farm, Derek learned that horses and donkeys are two different species. Based on this information, Derek can infer that horses and donkeys are members of different populations.


Since horses and donkeys are different species, they belong to different populations. A population refers to a group of individuals of the same species that live in the same area and can interbreed. While horses and donkeys can mate, their offspring, known as mules, are usually infertile.

This means that mules cannot produce offspring of their own, which indicates that horses and donkeys are not members of the same population. In contrast, if they were members of the same population, they would be able to produce fertile offspring. Therefore, Derek can infer that horses and donkeys are members of different populations.

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: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

What is pressure?

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

Various units are used to express pressure. Some of these are units of force divided by units of area. For example, the SI unit of pressure, Pascal (Pa), is 1 Newton per square meter (N/m2). Similarly, pounds force per square inch (psi, symbol lbf/in2) is the traditional unit of pressure in imperial and US systems. Pressure can also be expressed as standard atmospheric pressure. Atmospheric pressure (atm) is equal to this pressure and torr is defined as 1/760 of this. Manometric units such as centimeters of water, millimeters of mercury, and inches of mercury are used to express pressure as the height of a particular liquid column within a manometer.

If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

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The object occupies a volume of 0.1616 liters.

To determine the volume in liters occupied by an object, we need to divide its mass by its density. In this case, the object has a mass of 212.3 g and a density of 1.312 g/mL.

To convert the density from grams per milliliter (g/mL) to grams per liter (g/L), we need to multiply it by 1000 since there are 1000 milliliters in a liter. Therefore, the density is 1.312 g/mL x 1000 = 1312 g/L.

Now, we can calculate the volume using the formula:

Volume (in liters) = Mass / Density.

Substituting the given values:

Volume = 212.3 g / 1312 g/L = 0.1616 L.

Therefore, the object occupies a volume of 0.1616 liters.

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