Scientific notation 7.77 x 10^4 =

The correct identification of the units is given below:

The SI units and the physical quantities they represent are the meter for length, the second for time, the kilogram for mass, the kelvin for temperature, the candela for light intensity, the ampere for current flow, and the mole for substance amount.

US customary units refer to the system of measures used in the US to measure objects. All other measures are conventional, including the gallon for volume, mile for length, pound for mass, and degree Fahrenheit for temperature.

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identify each unit as belonging to si units or us customary units. gallon. mile. meter. pound. kilogram. degrees farenheight. kelvin.

Taking into account the reaction stoichiometry, if 10.3 g of Ca(OH)₂ reacts, 5.01 grams of H₂O are formed.

The balanced reaction is:

2 H₃PO₄ + 3 Ca(OH)₂  → 6 H₂O + Ca₃(PO₄)₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 222 grams of Ca(OH)₂ form 108 grams of H₂O, 10.3 grams of Ca(OH)₂ form how much mass of H₂O?

mass of H₂O= (10.3 grams of Ca(OH)₂ ×108 grams of H₂O)÷ 222 grams of Ca(OH)₂

mass of H₂O= 5.01 grams

Finally, 5.01 grams of H₂O are formed.

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1. Determine the total number of valence electrons in the molecule or ion.

• Add together the valence electrons from each atom. (Recall that the number of valence electrons is indicated by the position of the element in the periodic table.)

•If the species is a polyatomic ion, remember to add or subtract the number of electrons necessary to give the total charge on the ion.

2. Arrange the atoms to show specific connections.

• When there is a central atom, it is usually the least electronegative element in the compound.

• Chemists usually list this central atom first in the chemical formula, which is another clue to the compound’s structure.

• Hydrogen and the halogens are almost always connected to only one other atom, so they are usually terminal rather than central.

3. Place a bonding pair of electrons between each pair of adjacent atoms to give a single bond.

• In H2O, for example, there is a bonding pair of electrons between oxygen and each hydrogen.

4. Beginning with the terminal atoms, add enough electrons to each atom to give each atom an octet (two for hydrogen).

• These electrons will usually be lone pairs.

5. If any electrons are left over, place them on the central atom.

• Some atoms are able to accommodate more than eight electrons.

6. If the central atom has fewer electrons than an octet, use lone pairs from terminal atoms to form multiple (double or triple) bonds to the central atom to achieve an octet.

• This will not change the number of electrons on the terminal atoms.

7. Final check

• Always make sure all valence electrons are accounted for and each atom has an octet of electrons except for hydrogen (with two electrons).

To prove the chemical formula of a compound using the Lewis structure, you need to follow these steps:

1. Draw the Lewis structure of the compound: Start by drawing the Lewis structure of the compound using the valence electrons of each atom. The valence electrons are the outermost electrons of an atom, which participate in chemical bonding. To determine the valence electrons of an atom, you can refer to its position in the periodic table.

2. Determine the number of electrons in the compound: Count the total number of valence electrons in the compound by adding up the valence electrons of each atom in the compound. This number is equal to the sum of the valence electrons of all the atoms in the compound.

3. Determine the number of electron pairs in the compound: Count the number of electron pairs in the compound by dividing the total number of valence electrons by 2. This gives you the number of electron pairs in the compound.

4. Determine the connectivity of the atoms: Identify the connectivity of the atoms in the compound by drawing the lines that connect the atoms in the Lewis structure. Each line represents a bond between the atoms.

5. Determine the formal charge of each atom: Calculate the formal charge of each atom in the compound by subtracting the number of lone pair electrons and half the number of bonding electrons from the total number of valence electrons for that atom. The formal charge of an atom should be as close to zero as possible.

6. Write the chemical formula: Write the chemical formula of the compound by using the symbol of each atom in the compound, along with its subscript, which corresponds to the number of atoms of each element present in the compound.

By following these steps, you can use the Lewis structure of a compound to prove its chemical formula.

An illustration of beta decay is the decay of technetium-99, which has too many neutrons to be stable. A proton and a beta particle are created from a neutron in the nucleus.

Along with the beta particle, the nucleus also releases some gamma radiation. The new atom has 44 protons rather than the same number of mass protons.

β A high-speed electron known as a beta particle () is released from an atom's nucleus during various types of radioactive decay. In an equation, the symbol for a beta particle is either or e01. The beta decay of carbon-14 transforms it into a nitrogen-14 nucleus.

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Answer:

limestone < slime < hot coffee < helium balloons

Explanation:

The order is based on the average kinetic energy of the particles in each object. The order increases as the temperature of the object increases, causing the particles to move faster and have more kinetic energy.

1. Limestone: Solid-state mineral with relatively low temperature and slow-moving particles, lowest kinetic energy among the objects listed.

2. Slime: A non-Newtonian fluid that can be considered as a soft solid, its particles have more kinetic energy than solid limestone, but less than a liquid like hot coffee.

3. Hot Coffee: A liquid with a higher temperature than the other objects, particles have more kinetic energy compared to solid or non-Newtonian fluid.

4. Helium Balloons: Gas with a higher temperature than the other objects, particles have the highest kinetic energy among the objects listed, resulting in the balloon expanding and rising.

The largest star in the Alpha Centauri system, Alpha Centauri A, has a larger radius than Sirius.

Alpha Centauri A has a radius of 1.227 solar radii, while Sirius has a radius of 1.191 million kilometers. To compare the two, convert Sirius' radius to solar radii. To do this, use the known radius of the Sun, which is approximately 696,000 kilometers.

Thus, Sirius' radius can be expressed as 1.191 million kilometers / 696,000 kilometers = 1.72 solar radii.

Therefore, Alpha Centauri A has a larger radius than Sirius, with 1.227 solar radii > 1.72 solar radii.

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Answer:

Endothermic reactions: Heat is absorbed.

1) Photosynthesis: Plants absorb heat energy from sunlight to convert carbon dioxide and water into glucose and oxygen. 2) Cooking an egg: Heat energy is absorbed from the pan to cook the egg.

Explanation:

The major organic product of the given reaction is buten-2-one. Its structure is attached in image below. Therefore, option III is correct.

A chemical reaction is a hydration reaction. Water is one of the reactants converted into products. The hydration of alkenes to produce alcohols is one of the most common hydration reactions. The hydration of ethene, for example, produces industrial ethanol.

Hydration of alkynes by H₂SO₄ and HgSO₄ considers the addition reaction following Markovnikov's rule. Addition here is two times and the water get take away from the carbon resulting formation of buten-2-one as product.

Thus, option III is correct.

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Carbohydrates, lipids, proteins, and nucleic acids are the 4 types of organic molecules.

The simplest organic compounds are hydrocarbons, which carry only carbon and hydrogen. Alkanes contain hardly carbon–hydrogen and carbon–carbon single bonds, alkenes hold at least one carbon–carbon double bond, and alkynes contain molecules with one or more carbon–carbon triple bonds.

Four main classes of organic molecules—carbohydrates, lipids, proteins, and nucleic acids—are debated in the following sections. Examples of organic molecules are hydrocarbons, aliphatic amalgam, aromatic and alicyclic compounds, polymers, biomolecules, and buckyballs. collate inorganic molecules.

So we can conclude that organic compounds are carbohydrates, fats (lipids), proteins, and nucleic acids.

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Answer:

4.02 kJ

Explanation:

We must convert the answer to kJ 4023.25 J . 1kJ /1000 =4.02kJ

No, that is not correct. Phosphoric acid (H3PO4) and pyrophosphoric acid (H4P2O7) are two different chemical compounds. Phosphoric acid is a tri-protic acid with three acidic hydrogens, while pyrophosphoric acid is a diphosphoric acid with two acidic hydrogens.

When phosphoric acid is mixed with water, it dissolves to form a solution of hydrogen ions (H+) and phosphate ions (PO4-). The concentration of hydrogen ions can be adjusted by adding more or less water to the solution, which changes the pH of the solution.

Pyrophosphoric acid is a more complex molecule than phosphoric acid, and its behavior in water is different.

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The  reaction rate to the nearest whole number is  352 mg/L/sec. Reaction rate is the pace at which an chemical process moves forward.

Reaction rate is the pace at which an chemical process moves forward. It is frequently described in terms either of the amount of a reactant that's also consumed in a time unit or the intensity of a product that is generated in a unit of time (amount per unit volume). You may also describe it in terms of how much of the reactants are used up or how much of the products are produced in a certain length of time.

at 3°C

Reaction rate = (1000/0.2)/138.5 = 36 mg/L/sec

at 24°C

Reaction rate = (1000/0.2)/34.2 = 146 mg/L/sec

at 40°C

Reaction rate = (1000/0.2)/26.3 = 190 mg/L/sec

at 65°C

Reaction rate = (1000/0.2)/14.2 = 352 mg/L/sec

Therefore, the  reaction rate to the nearest whole number is 352 mg/L/sec.

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Answer:

see below

Explanation:

3°C: 36

24°C: 146

40°C: 190

65°C: 352

Full table: 145

Eight pieces: 173

Tiny pieces: 216

Answer:

B- Active volcano

Explanation:

The enthalpy of this reaction is 1.48 kJ/mol.

The formula to calculate heat energy is

Q = m × c × ΔT

ΔT = T₂ - T₁

ΔT = T₂ - T₁ = 24.70 - 21.00 = 3.70 °C

Q = m × c × ΔT

Q = 191 × 4.184 × 3.70

Q = 2,956.83 J

Q = (2,956.83 ÷ 1,000) kJ

Q = 2.96 kJ

The enthalpy ΔH = Q ÷ n

ΔH = Q ÷ n

ΔH = 2.96 ÷ 2.00

ΔH = 1.48 kJ/mol

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If you put 1.50 moles of N2 and 4.00 moles of O2 gas in a 45.0 L container at a temperature of 45°C, the total pressure of the system is 323.1 atm.

The ideal gas law, also known as the general gas equation, is the state equation for a hypothetical ideal gas. Although it has several limitations, it is a good approximation of the behavior of many gases under many conditions.

Given;

N = 5.50 moles

V = 45.0 L

R = gas constant 8.314

T = 318 kelvin

P = ?

By an Ideal gas equation,

PV = nRT

By substituting this values in ideal gas equation, and we get as follows:

P = nRT / V

= 5.50 × 8.314 × 318 / 45.0

= 323.1 atm

Thus, the total pressure of the system is 323.1 atm.

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Food safety guidelines recommended that a beef rib roast bone in should cook for 23.0 minutes per pound based on 325°F oven setting. 2 hours should it take to cook a 5.17 pound roast.

Food safety is concerned with how food is handled, stored, and prepared in order to prevent infection and ensure that our food contains enough nutrients for us to maintain a healthy diet.

It takes 23 min per one lb (pound)

Then it takes how many min for 5.17 pound

= 23 min / pound x 5.17pound

= 118.91 min x 1hr / 60 min

= 1.982hr

≅ 2 hrs

Thus, 2  hours should it take to cook a 5.17 pound roast.

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1056644.36 calories are in 4421 kilojoules.

As,

1 Kilojoule = 1000 joule

4421 Kilojoule = 4421000 joule

4.184 J = 1 cal

1 J = 1/4.184 cal

4421000 J = 4421000/4.184

So,

4421000 J = 1056644.35 Cal

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The density of the gas is 1.65 g/L.

We know that in this case that we would need to use the ideal gas equation and this is the one that would deal with the pressure and the density of the gas and the formula that is to be used is the one that saya that;

d =MP/RT

M = molar mass of the gas

P = pressure of the gas

P = pressure of the gas

R = gas constant

T = temperature of the gas

We would then have that;

d = 38 * 1.26/0.082 * 354

= 1.65 g/L

The gas would have a density of about 1.65 g/L.

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According to the electronic configuration , gold and silver are inert metals and hence withstand the elements of the sea differently.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule.

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Taking into account the definition of significant figures, 8.4×10⁻² g  expressed using two significant figures is 8.4×10⁻² g

Significant figures are the digits of a number that are considered nonzero and have a real meaning and, therefore, provide some information.

To establish the significant figures you must bear in mind that:

Scientific notation is useful because it makes it easier to understand the value of measurements, especially when they have very large or very small values, and it helps to identify significant figures.

To express a measurement in scientific notation, the first significant figure is placed starting from the left in the units position, followed by the decimal point and the rest of the significant figures. The number obtained is then multiplied by the power of 10 needed to retrieve the original number.

Then, in this case, 8.4×10⁻² g  expressed using two significant figures is 8.4×10⁻² g, since 8 and 4 are the two significant digits.

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1876.5J is the amount of heat released. Heat is the energy that moves through one body to another when temperatures are different.

Heat is the energy that moves through one body to another when temperatures are different. Heat passes from the hotter to the colder body when two bodies with differing temperatures are brought together.

By transitioning through one physical state (or phase) to another, such as from a phase from solid to liquid (melting), from such a solids to a vapour (sublimation), from either a liquid to a vapour (boiling), either from from solid form to another, a substance can absorb heat without increasing in temperature (usually called a crystalline transition).

q=m×c×ΔT

q=99.7632× 0.45×(64.4°C-22.6°C )    

q=99.7632× 0.45×41.8=1876.5J

Therefore, 1876.5J is the amount of heat released.

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Answer:

Explanation:

liquid

The density of nitrogen gas at 67.3 °C and 0.288 atm is approximately 0.0147 g/L.

Nitrogen are commonly used during sample preparation in chemical analysis and It also used to concentrate and reduce the volume of liquid sample.

The density of a gas can be calculated using the Ideal Gas Law:

PV = nRT

We can rearrange the equation to solve for the volume:

V = nRT / P

And then use the density formula:

density = mass / volume = m / V

where m is the mass of the gas and V is the volume.

Since the moles and the mass of a gas are related by its molecular weight (m = n * MW), we can substitute n * MW for m:

density = (n * MW) / V

Plugging in the values we get:

density = (n * 28.01) / (RT / P)

density = (n * 28.01 g/mol) / ((8.31 J/molK * (67.3 + 273.15 K)) / 0.288 atm)

density = (n * 28.01 g/mol) / (547.57 J/mol / 0.288 atm)

density = (n * 28.01 g/mol) / (1915.69 J/mol / atm)

density = (n * 28.01 g/mol) * (1 atm / 1915.69 J/mol)

density = 0.0147 g/L

Therefore, The density of nitrogen gas at 67.3 °C and 0.288 atm is approximately 0.0147 g/L.

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The density of the Nitrogen gas is 0.29 g/mol.

The Ideal gas law is a scientific equation that describes the behavior of an ideal gas, a theoretical gas made up of a large number of particles that do not interact with each other. The Ideal gas law states that the pressure, volume, and temperature of an ideal gas are directly proportional to each other.

Using the formula;

d = MP/RT

Density = d

Molar mass of the gas = M

Gas constant = R

Temperature = T

d= 28 g/mol * 0.288/0.082 * 340.3

d = 8.06/27.9

d = 0.29 g/mol

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The decomposition of 2 moles of ammonia gas will give one mole of nitrogen gas and 3 moles of hydrogen gas. This is an endothermic reaction.  

Ammonia is an inorganic gas formed by the combination of nitrogen gas and hydrogen gas. The industrial synthesis of ammonia gas is known as Haber process.

The formation of ammonia is a reversible process and ammonia can decompose to form the constituent gases nitrogen and hydrogen.

The balanced chemical equation of the decomposition of ammonia gas is written as follows:

[tex]\rm 2NH_{3} \rightarrow 3H_{2} + N_{2}[/tex]

Therefore, the decomposition of 2 moles of ammonia gas will produce one mole of nitrogen gas.

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The mass of the solution is 1.24 Kg. Number of moles of NaCl solute is 2.20. Then the molality of the solution is 1.98 molal. The mass percent of the solute is 10.3 %.

Molality is a term used to express the concentration of a solution. It is the ratio of number of moles of solute to the mass of solvent in kg.

Given the weight of NaCl = 129 g

molar mass = 58.5 g/mol

number of moles = 129/58.5 = 2.20 moles.

Density of solution = 1.08 g/ml

volume of solution  = 1150 ml

then mass of solution = volume  × density = 1150 ×1.08 = 1242 g.

mass of solvent = 1242 -129 = 1113  g = 1.11 Kg.

molality of the solution = 2.2 moles/1.1 Kg = 1.98 molal.

Mass percent of the solution = mass of solute/total mass × 100

mass % = 129 g / 1242 g × 100 = 10.3 %.

Hence, mass percent of the solution is 10.3 %.

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The block on your desk given that it measures 3 cm by 4 cm by 6 cm and has a mass of 184.32 grams is made of marble

To know what the block is made of, we shall determine the density of the block. Details below:

Density = mass / volume

Density of block = 184.32 grams / 72 cm³

Density of block = 2.56 g/mL cm³

Thus, from the calculation made above and also considering the table of densities given, we can conclude that the block is made of marble.

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Missing part of question:

See attached photo

From the formula of the compound;

The formula of the compound from potassium, K, and nitrogen, N is K₃N.

The formula of the compound is K₃N because K has a valency of 1 while N has a valency of 3.

From the formula of the compound, the number of moles of atoms of K present is 3 moles of atoms.

The number of atoms of K will then be 3 * 6.02 * 10²³ = 18.06 * 10²⁴ atoms of K

From the formula of the compound, the number of moles of atoms of N present is 1 mole of atoms.

The number of atoms of N will then be 1 * 6.02 * 10²³ = 6.02 * 10²³ atoms of N.

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Answer: +2

Explanation::)

Answer: sweet home

Explanation: