The air, soil, and most foods and beverages are examples of _____. mixtures compounds elements pure substances

Answer:

1.674 x 10^-23 grams

Explanation:

Hydrogen-1 is called Protium

wikipedia

atomic mass of Protium is 1.00794 amu

sciencedirectcom

atomic mass of 10 Protiums is 10.0794 amu

10.0794 amu in grams is

1.6737236x10^-23 grams

Answer:

(a) GaF3, gallium(III) fluoride

(b) LiH, lithium hydride

(c) AlI3, aluminum(III) iodide

(d) K2S, potassium sulfide

Answer:

beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

Alkaline earth metals are those that have two valence electrons in their outermost shell.

Barium (Ba), Radium (Ra), Strontium (Sr), Magnesium (Mg), Calcium (Ca), and Beryllium (Be) are the six alkaline earth metals.

By donating their outermost electrons, they take on the noble gas electron configuration, which increases their stability. When electrons are transferred to an atom with an electronegative charge, the alkaline earth metals get a positive charge.

The second column of the periodic table contains alkaline earth metals, which are very reactive metals. These metals are the building blocks of the entire world. These metals are typically found as sulfates in nature.

A few examples of minerals are gypsum, calcium sulfate, epsomite, magnesium sulfate, barite, and barium sulfate.

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For a substance to begin to boil, it must have an increase in kinetic energy, either due to an increase in temperature or a decrease in pressure. Now, by having greater kinetic energy, the average speed of the molecules will be greater, there will also be greater collisions between the molecules and they will begin to move away. Therefore, the correct option will be: The particles move more quickly and spread far apart.

Answer: C. The particles move more quickly and spread far apart.

According to specific heat capacity, 2478.6 joules of heat does the silver bar absorb.

Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.

It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .

It is given by the formula ,

Q=mcΔT, substitution in formula gives Q=255×0.240×40.5=2478.6 J.

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To create molecules, atoms combine. Two hydrogen (H) atoms and one oxygen (O) atom make up a water molecule's three atoms. H2O is a common abbreviation for water because of this.

The smallest unit of a material that keeps its content and characteristics is a molecule, which is made up of two or more atoms linked together by chemical bonds. The building blocks of chemistry are molecules.

The phrase "the molecules of life" frequently refers to these four categories of molecules. Proteins, carbohydrates, lipids, and nucleic acids make up the four basic building blocks of life. Every single life on Earth depends on one or more of the four categories. These four molecules are necessary for a cell and an organism to exist.

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Polymers are large molecules made up of repeating subunits called monomers, and they are essential building blocks for many cellular structures and processes.

A molecule is a group of two or more atoms that are chemically bonded together. Molecules are the fundamental units of compounds, which are substances made up of two or more different types of atoms.

Molecules can have a variety of sizes and shapes, depending on the number and arrangement of atoms. Some molecules are simple, consisting of just a few atoms, while others are much larger and more complex, such as proteins or DNA. The properties and behavior of a substance depend largely on the types of molecules it contains and how those molecules interact with each other.

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Structural isomers are molecules with the same molecular formula but with different structural formulae. This means that they have the same number and types of atoms, but they are arranged differently. The following two organic compounds are structural isomers of each other.

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Because digital data can be lost so easily, Atomic Theory it is essential for photographers to have at least 1 backup of each shot they intend to save for the long term.

Higher Initial Cost: Compared to roll film cameras, greater, fully-loaded digital cameras can be a little more expensive. Battery Consumption: With digital cameras, the battery runs out more quickly. This necessitates having a few spare batteries on hand, especially while taking numerous photos.

The process of finding solutions is iterative: Start by formulating theories for potential solutions to your problem. Create a how map by structuring these hypotheses. Next, prior to performing the actual testing, choose which hypothesis you wish to test first.

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The question requires us to calculate the number of atoms in 25.75 g of Hg, 0.0740 g of Mg and 160 g of Br.

To calculate the number of atoms in a sample, given its mass, we need to use the Avogadro's number, which defines the number of particles (atoms, molecules, ions etc.) in 1 mol of any substance as 6.02 x 10^23 particles.

Using the Avogadro's number, we can write:

1 mol of substance (in mol) = atomic mass or molar mass (in g) --------------- 6.02 x 10^23 particles

mass of a sample (in g) ----------------------------- x

(where x is the value we want to calculate - the number of particles).

Solving for x, we'll have:

Therefore, to calculate the number of atoms in the samples given by the question, we need the atomic mass of the elements (Hg, Mg and Br), the mass of the sample (given by the question) and the Avogadro number (6.02 x 10^23 particles/mol).

Next, we'll calculate the number of atoms for each sample using the equation above:

• For 25.75 g of Hg:

The atomic mass of Hg is 200.59 u. We can apply the equation as it follows:

Therefore, there are 7.728 x 10^22 atoms in 25.75 g of Hg.

For 0.0740 g of Mg:

The atomic mass of Mg is 24.305 u. We can calculate the amount of atoms as it follows:

Answer:

hydrocarbons contain both Hydrogen and Carbon while organic compounds

are compounds in which  one or more atoms of Carbon are  covalently linked

with  other elements

Explanation:

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The partial pressure of hydrogen is 0.98 atm while the partial pressure of water is 0.02 atm. The total pressure of the system is 1 atm.

We have seen the reaction as it has been shown in the equation that is attached to the question above. Now, we must have to find the number of moles of the hydrogen that was obtained.

Number of moles of sodium =  1.90 g/23 g/mol = 0.08 moles

2 moles of sodium produces 1 mole of hydrogen

0.08 moles of sodium would produce 0.08 moles * 1 mole/ 2 moles

= 0.04 moles

Given that;

P = pressure

V = volume

n = Number of moles

R = gas constant

T = temperature

PV = nRT

P = nRT/V

P = 0.04 * 0.082 * 298/1

P = 0.98 atm

The partial pressure of the hydrogen = 0.98 atm

The partial pressure of the water = SVP of water at 18°C = 0.02 atm

Total pressure of the system =  0.98 atm +  0.02 atm = 1 atm

The system has a total pressure of 1 atm.

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Answer:

iron and chlorine

Explanation:

Answer:

The temperature of the iron block is 68.5°C.

Explanation:

The heat released during condensation of water is used to warm the iron block:

q = m_H2O * ΔH_vap = m_fe * c_fe * ΔT

where q is the heat released, m_H2O is the mass of water condensed, ΔH_vap is the enthalpy of vaporization for water, m_fe is the mass of iron, c_fe is the specific heat capacity of iron, and ΔT is the change in temperature of the iron block.

Rearranging the equation gives:

ΔT = (m_H2O * ΔH_vap) / (m_fe * c_fe)

Substituting the given values gives:

ΔT = (0.95 g * 44.0 kJ/mol) / (75.0 g * 0.449 J/(g°C))

ΔT = 46.5°C

Therefore, the final temperature of the iron block is:

T_f = T_i + ΔT = 22°C + 46.5°C = 68.5°C.

The final temperature of the iron block is 68.5°C.

Answer:

Decomposition

Explanation:

Answer:

Bohr's model of the hydrogen atom is based on three postulates:

1) An electron moves around the nucleus in a circular orbit,

2) An electron's angular momentum in the orbit is quantised,

3) The change in an electron's energy as it makes a quantum jump from one orbit to another is always accompanied by the emission or absorption of a photon. Bohr's model is semi-classical because it combines the classical concept of electron orbit (postulate 1) with the new concept of quantisation ( postulates 2 and ).

Th correct answer is 28 g/mol

Given,

mass of the gas = 800 cm³ = 0.8 m

1 mole of gas at STP is 22.4

We know,

If, 1 mole Q occupies 22400 cm

Then, x mole occupies 800 cm³

x = 800/22400

= 0.036mol

Molar mass = Mass ÷ Mole

                   = 1 ÷ 0.036

Molar mass = 28 g/mol

Therefore, the molar mass of Q is 28 g/mol.

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Answer:

399.80 atm

Explanation:

Since there are 101.3 kPa per every 1 atm, you need to divide the given number by 101.3 to convert the pressure from kPa to atm.

1 atm = 101.3 kPa

 40500. kPa               1 atm
---------------------  x  --------------------  = 399.80 atm
                                 101.3 kPa

Explanation:

The percentage abundance of the following gases in the atmosphere is given as;

Carbon dioxide = 0.04 percent

Other trace gases =  about a tenth of one percent of the atmosphere.

Argon = 0.93 percent

Oxygen = 21 percent

Nitrogen = 78 percent

Te order from highest to lowest is given as;

Nitrogen

Oxygen

Argon

Carbon dioxide

Other trace gases

We must take into consideration the balance of atoms and charges in order to balance the half-reaction for the conversion of S2O3 2- to S4O6 2- in acidic solution.

Write the imbalanced half-reaction as the first step.

S2O3 S4O6 2- (aq)

Step 2: Align the atoms, with the exception of hydrogen and oxygen.

2S4O6 2-(aq) = S2O3 2-(aq)

Step 3: Add water (H2O) to balance the oxygen atoms.

2S4O6 2- (aq) + H2O = S2O3 2- (aq)

Step 4: Add hydrogen ions (H+) to balance the hydrogen atoms.

2S4O6 2- (aq) + H2O = S2O3 2- (aq) + 4H+ (aq)

Step 5: Add more electrons (e-) to balance the charge.

2S4O6 2- (aq) + H2O = S2O3 2- (aq) + 4H+ (aq) + 2e-

The balanced half-reaction in acidic solution is:

S2O3 2- (aq) + 4H+ (aq) + 2e- → 2S4O6 2- (aq) + H2O

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Answer:

Potassium is more reactive than aluminium, so no reaction takes place. But aluminium is more reactive than copper, so it replaces the copper in copper nitrate

More reactive metal compound + less reactive metal

-> no reaction

However

Less reactive metal compound + more reactive metal

-> more reactive metal compound + less reactive metal

This is called substitution reaction where the more reactive metal replaces the less reactive metal in the compound.

Answer:

A ---->gamma ray

Explanation:

Gamma rays have the highest frequencies among all electromagnetic waves and therefore have the shortest wavelengths.

Hg + O2 → HgO

✅Word equation: Mercury + Oxygen gas → Mercury (II) oxide

✅ Type of Chemical Reaction: For this reaction we have a combination reaction.

✅ Balancing Strategies: To balance this equation it's probably easiest to begin by changing the coefficient in front of the HgO.

This is a combination reactions because the mercury (Hg) plus the oxygen gas (O2) come together to form the Mercury (II) oxide (MgO).

Hint-1

Hint-2

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The question provides a table with the concentrations of five solutions (including the stock solution) and requires us to describe the procedure to prepare these solutions, considering a sequential dillution process.

To solve this question, we need to calculate the volume of each solution required to prepare the following (more diluted) KMnO4 solution. To do that, we'll be using the following equation:

Where C1 and V1 are the concentration and volume of the initial solution, respectively, and C2 and V2 are the concentration and volume of the final solution.

Since the information we need is actually the volume required of the initial solution and the final volume is always 100 mL (as stated by the question), we can rearrange the equation as:

(Note that C2 and C1 are given in the table)

With the equation above, we can calculate the volumes required and fill out the last column of the table:

For flask 1: V1 = [ (0.0054 M) x (100 mL) ] / 0.054 M = 10 mL

For flask 2: V1 = [ (0.00135 M) x (100 mL) ] / 0.0054 M = 25 mL

For flask 3: V1 = [ (0.0002025 M) x (100 mL) ] / 0.00135 M = 15 mL

For flask 4: V1 = [ (0.0000405 M) x (100 mL) ] / 0.0002025 M = 20 mL

Now that we know the required volumes to prepared all solutions in a sequential dilution process, we can describe the procedure as it follows:

a. To prepare a 0.0054 M KMnO4 solution: use a 10 mL volumetric pipette to transfer 10 mL of the stock solution to a 100mL volumetric flask (Flask 1), then complete the volumetric flask with water.

b. To prepare a 0.00135 M KMnO4 solution: use the 25 mL volumetric pipette to transfer this volume of the solution from flask 1 (0.0054 M) to a clean 100 mL volumetric flask (Flask 2) then complete the flask with water.

c. To prepare a 0.0002025 M KMnO4 solution: use the 15 mL volumetric pipette to transfer this volume of the solution from flask 2 (0.00135 M) to a clean 100 mL volumetric flask (Flask 3) then complete the flask with water.

d. To prepare a 0.0000405 M KMnO4 solution: use the 20 mL volumetric pipette to transfer this volume of the solution from flask 3 (0.0002025 M) to a clean 100 mL volumetric flask (Flask 4) then complete the flask with water.

Answer:10.71 g

Explanation:

Answer: sorry I didnt know the answer it wont let me get off

Explanation:

Answer:

HCl is not a catalyst because these are not used up during the chemical reactions.

Explanation:

Hello there!

In this case, according to the performed experiments, it is possible for us to realize that HCl cannot be a catalyst for this reaction because it is used up during the reaction. This is explained by the fact that catalyst are able to return to the original form once the reaction has gone to completion; this is the example of palladium in the hydrogenation or dehydrogenation of hydrocarbons depending on the case. Moreover, we know that the catalysts increase the reaction rate because they decrease the activation energy of the reaction and therefore the student observed such increase.

Best regards!

Six moles of oxygen are used in the reaction between one mole of glucose to create six moles of carbon dioxide and six moles of water.

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After 2 half-lives there will be 25% (1/4th) of the original isotope, and 75% (3/4 th) of the decay product

A half life is a measurement of the slope of an exponential decay function.

It is also defined as, the time it takes to halve the concentration of something in a process.

Each half life you will have half of what you had at the beginning of a given half life.

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