a compound is found to contain 7.523 % phosphorus and 92.48 % iodine by mass. what is the empirical formula for this compound?

Answer:

H2 + 3N2 ⇒ 2NH3

Explanation:

Remember when balancing chemical equations you are trying to make sure that each side of the equation has a equal number of atoms, and when one sides number of atoms is odd you need to multiply to get a even number.

H2 + N2 = NH3

N = 1 × 2 = 2

H = 3 × 2 = 6

N = 2 × 1 = 2

H = 3 × 2 = 6

H2 + 3N2 ⇒ 2NH3

Hope this helps.

Answer:

Due to the difference in the relative atomic masses and therefore, the molecular masses of Zn and Pb, one mole of Zn is about 3.2 times lighter than one mole of Pb

Explanation:

From the periodic table, we have;

The atomic number of zinc, Zn = 30

The atomic mass of zinc, Zn = 65.38 amu

The molar mass of zinc, Zn = 65.38 g/mol

The atomic number of lead, Pb = 82

The atomic mass of lead, Pb = 207.2 amu

The molar mass of lead, Pb = 207.2 g/mol

Therefore, whereby equal number of moles of Zn is lost and Pb is gained, we have;

Mass of 1 mole of Zn = 65.38 grams

Therefore, 1 gram of Zn = 1/65.38 moles = 0.0153 moles

0.12 grams of Zn = 0.12×0.0153 = 0.00184 moles of Zn

Given that equal number of moles of Zn and Pb are involved in the reaction, the number of moles of Pb gained = 0.00184 moles

The mass of Pb gained = Number of moles of Pb gained × Molar mass of Pb

The mass of Pb gained = 0.00184 × 207.2 = 0.38 g ≈ 0.4 g.

Amount of Pb gained = 0.43 g ≈ 0.4 g

Answer:

Observation

-I smell onions

-My dog weighs 45 pounds

-It is 85 degrees outside today

Predictions

-My dog will bark at the vacuum cleaner

although he has never seen it before

-My mother is going to cook spaghetti for

supper next Tuesday

-It will be a long, hot summer

Explanation:

Since cobalt is not a noble gas, the only 2 things we need to look at in this situation are metal and transition element.

A chemical element with the atomic number 27 and the symbol Co is cobalt. With the exception of minor concentrations found in alloys of naturally occurring meteoric iron, cobalt is only ever found in the Earth's crust in a chemically mixed state. The free element created by reductive smelting is a hard, shiny metal that is silver-gray in colour.

Located in the middle of the periodic table of elements, the group of 28 elements known as transition metals includes cobalt. Many of the properties of transitional metals are shared. They have high melting and boiling temperatures and are quite hard, yet they are also malleable and ductile.

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Answer:

solid

Explanation:

...

The temperature from the metal is transferred to water. Hence the heat lost by the metal is equal to the heat gained by water. Then using calorimetric equation, mass of gold is , 353.8 g.

Calorimetry is an analytical technique used to determine the heat energy absorbed or evolved by a system. The calorimetric equation relating the heat energy q with the mass m, specific heat c and the temperature difference ΔT is :

q = m c ΔT

Here, the heat energy absorbed by water in the calorimeter is equal to the heat evolved from the hot gold metal.

given c of gold = 0.130 J/°C g

c of water = 4.12 J/°C g

temperature difference for water = 45- 20 °C = 25°C

thus, 25°C is lost from the metal.

Then, Mg × 0.130 J/°C g × (150 -25°C ) = 50 g × 4.12 J/°C g × 25°C

then Mg = 353.8 g.

Therefore, mass of gold is 353.8 g.

In similar way, we can find the final temperature of the second system if all other quantities are given.

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Answer

moles = 5.81 mol

Explanation

Given:

Volume = 144 L

AT SATP

1 mole = 24.4651 L

Solution:

1 mole = 24.4651 L

x mole = 144 L

x = 144/24.4651

x = 5.8 mol

Answer:

A) Water

Explanation:

2 hydrogen and 1 oxygen makes water H2O

Water is an inorganic compound.

An inorganic compound are those which don't possess carbon atom in it.

On the other hand, organic compound possesses carbon atoms which are

linked to other elements.

Examples of organic compounds include the following:

Water comprises of Hydrogen and Oxygen atoms thereby making it an

inorganic compound.

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Answer:

H20 only

Explanation:

It's because that When a chemical forms, It turns into a product. The product can't just float away, but byproducts can.

Answer:

smell accordingly so that I can't diffuse the air and reach your nose

A perfume must easily evaporate so that the particles can diffuse through the air and reach your nose. The missing word in this sentence is evaporate.

Evaporation is also called as vaporization which is takes place on the surface of a liquid as it transitions into the gas phase. High concentrations of the chemical that is evaporating slow down evaporation by a significant amount in the surrounding gas.

Evaporation is a surface phenomenon because it occurs when molecules with higher kinetic energy from the top layer of the liquid escape into the air.

Diffusion is a process where particles travel from a highly concentrated location to a less concentrated area.

Thus, A perfume must easily evaporate so that the particles can diffuse through the air and reach your nose.

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Answer:

20 to 50 million

Explanation:

The law that can be used to explain this is the Henry's law. Option A

Henry's law is a theory that explains the connection between a gas's solubility in a liquid and its partial pressure. According to this, the amount of a gas that dissolves in a liquid is directly proportional to the partial pressure of the gas above the liquid when the temperature is constant.

Mathematically;

C = k * P

C = the concentration of the dissolved gas in the liquid

k = Henry's law constant

P = the partial pressure of the gas

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Answer: sorry its lagging i hope this help fore 18.. =D

Explanation:

n,s is repeating the cycle of the inside

Answer/Explanation:

18, a,

I believe the n, and s represents North, South, or just the way the arrows are rotating repeatedly.

18, b,

The phenomenon re-occurring shows the alignment of magnetic dipoles with in a magnet, like inside. The arrows show a direction in the line with an external magnetic field in a way that it can produce its own magnetic fields that seem to travel from North to the South.

18, c,

Incorrect. Refrigerator magnets have multiple layers of magnification, they use opposite polarities to stay this way. If he puts the magnet sideways it may stick to the fridge

~ LadyBrain

Answer: MgAl2O4 or Spinel (gemstone)

Explanation:

Answer:

non metal forms anions

metals for cations

nonmetals and metals bond because of electron transfer

an example is NaCl(Sodium chloride)

Answer:

Nuclear metldowns

Explanation:

Answer:

Which statement would be a valid argument in favor of using nuclear power?

There are few negative impacts from mining the fuel.

Reactors are safe from natural disasters.

There are little to no waste products from fission.

Nuclear power does not contribute greenhouse gases.

Explanation:

The answer is D, because I just answered it on Edge and it was correct. Please mark my answer as the Brainiest!!!!!!!!!!!

A 30 kg dog runs at a speed of 15 m/s.

What is the dog’s kinetic energy?

Answer: 3,400 J

True statement about steel shot versus lead shot is Steel shot is more unstable in flight than lead shot. Hence, option D is correct.

Lead is more dense than steel. The steel pellets weigh one-third less than lead pellets of the same size.

Hence, we can conclude that steel shot is more unstable in flight than lead shot.

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Neon has 8 valence electrons in the outermost shell and Methane also has 8 valence electrons in the outermost shell.

Neon ( Noble gas ) 

The atomic number is 10, 1s2, 2s2, and 2p6.

Eight total valence electrons in the outermost shell (2s2,2p6). Since neon's octet is already complete due to having 8 valence electrons in its outermost shell, it lacks the orbitals necessary to form covalent bonds and does not have any bonding pairs.

Four of its pairs are non-bonding. Since they won't form any bonds, all of the electrons will be counted as non-bonding pairs (1 pair equals 2 electrons

CH4 (Methane) (Methane)  Eight valence electrons total. It has four pairs of bonds. 0 (because there are no lone pairs) non-bonding pairs.

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To determine the pH of a solution using a pH indicator paper, you need a color chart or a color scale that corresponds to different pH values.

This color chart or scale is used to compare the color of the pH indicator paper after it has been immersed in the solution. The pH indicator paper is impregnated with a universal pH indicator, which is a chemical compound that changes color depending on the acidity or alkalinity of the solution.

The indicator undergoes a chemical reaction with the hydrogen ions (H+) or hydroxide ions (OH-) present in the solution, resulting in a color change.

By comparing the color of the pH indicator paper with the color chart or scale, you can determine the approximate pH of the solution. The color chart usually provides a range of colors corresponding to different pH values, allowing you to match the observed color to the nearest pH value.

In the hypothesis mentioned, the aim is to calibrate a cabbage pH indicator using the pH values obtained from a universal pH indicator. Therefore, in addition to the pH indicator paper and color chart, you would also need a range of solutions with known pH values to establish a calibration curve specific to the cabbage pH indicator.

In summary, to determine the pH of a solution using a pH indicator paper, you need a color chart or scale that correlates the observed color of the pH indicator paper with different pH values. This chart or scale serves as a reference for interpreting the color change and determining the pH of the solution.

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Answer: COLOR KEY

Explanation: CS

Answer:

Hubble's Law

Explanation:

search it!!

Answer:

More Stars are being made expaning the universe new galaxys are being made by stars,dust and dark matter.

Answer:

Explanation:

solid would be a wall e.g

liquid would be water e.g

gas would be oxygen e.g

Answer:

def don't understand that sorry

A shorthand notation that represents a chemical symbol and number is called a **chemical formula**.

Chemical formulas are used to represent the composition of compounds and elements in a concise and standardized manner. They consist of chemical symbols for the elements involved, along with subscript numbers that indicate the number of atoms or ions of each element in the compound. For example, the chemical formula H2O represents water, where "H" represents hydrogen and "O" represents oxygen, and the subscript "2" indicates that there are two hydrogen atoms for every one oxygen atom.

Chemical formulas are essential in chemical equations, naming compounds, and understanding the stoichiometry and composition of substances. They provide a convenient and universally recognized way to represent the elements and their ratios within a compound.

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When she heats the bowl, it forms a new compound that may be white before heating and white or some other dark color after heating.

New substances are formed when different kinds of atoms combine to form compounds. New compounds do not have the same physical or chemical properties as the original elements. you have your own new life. Compounds are described using formulas that indicate which elements of the periodic table are combined.

Compounds are formed when two or more elements combine in a chemical reaction. Complex molecules like proteins are formed by a series of reactions involving elements and simple compounds. Compounds are formed through chemical reactions. Elements of a compound are held together by chemical bonds. A chemical bond is an attraction between atoms or ions that share or transfer valence electrons.

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Answer:

scientists are uncertain of how long the resources will last.

Explanation:

It is hard to estimate how long certain natural resources will last because they are dependent upon the rate of consumption and other factors. There are many fields of studies going into alternative energy. Since the technology needed for some of these ideas will take time to be developed, alternative sources of energy must be found before the resources we already have run out.

Answer: A. scientists are uncertain of how long the resources will last.

Explanation:

We are looking into many other types such as: Solar, Nuclear, Water, Etc.

There are 629,852 different basketball teams of 5 players that can be chosen from a group of 100 people

The number of different basketball teams of 5 players that can be chosen from a group of 100 people can be calculated using the formula for combinations:

C(n, r) = n! / (r! * (n-r)!)

where "n" is the total number of people in the group and "r" is the number of people we want to choose for the basketball team.

Substituting n = 100 and r = 5 into the formula, we get:

C(100, 5) = 100! / (5! * (100-5)!)

C(100, 5) = (100 x 99 x 98 x 97 x 96) / (5 x 4 x 3 x 2 x 1)

C(100, 5) = 75,287,520 / 120

C(100, 5) = 629,852

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The fractional yield of fresh water from the process is determined by solving a set of equations. The weight percent of salt in the solution leaving the fourth evaporator can also be determined using these equations.

(a) Flowchart of the process:

In the first evaporator, seawater containing 3.50 wt% salt enters and produces vaporized water with the same salt concentration. The vaporized water is condensed, and the resulting brine, still containing 3.50 wt% salt, is fed to the second evaporator. This process continues until the tenth evaporator, where the brine leaving has a salt concentration of 5.00 wt%. The product stream of fresh water is obtained by condensing and combining the vaporized water from each evaporator.

(b) Set of equations:

To determine the fractional yield of fresh water from the process and the weight percent of salt in the solution leaving the fourth evaporator, the following equations can be solved:

Equation 1: x1 = (1 - 0.035)   [Variable to solve: x1]

Equation 2: x2 = (1 - 0.035) * x1   [Variable to solve: x2]

Equation 3: x3 = (1 - 0.035) * x2   [Variable to solve: x3]

Equation 4: x4 = (1 - 0.035) * x3   [Variable to solve: x4]

Equation 5: x4 = (1 - 0.050) * x10   [Variable to solve: x10]

In these equations, x1, x2, x3, and x4 represent the fractional yield of fresh water from the first, second, third, and fourth evaporators, respectively. x10 represents the fractional yield of fresh water from the tenth evaporator.

(c) Solution:

To solve the equations derived in part (b), we need to find the values of x1, x2, x3, x4, and x10. These values can be obtained by substituting the known values of salt concentrations and solving the equations simultaneously. Once the values are determined, the fractional yield of fresh water from the process and the weight percent of salt in the solution leaving the fourth evaporator can be calculated.

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Answer:

B, E

Explanation:

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