What reaction would the chemical equation 2H2O→2H2+O2 represent? helppppp!!!


decomposition of water


formation of water


replacement of water


combustion of water

Answer:

They collect all of the evidence for cases

Explanation:

The value that would be put in the numerator of this calibration would be 10° C .

The process of calibrating an instrument involves setting it up such that it can produce results for samples that are within a reasonable range. A key component of instrumentation design is eliminating or reducing conditions that lead to faulty measurements.

In order to ascertain the mistake or confirm the precision of the unknown value of the DUT, a calibration is normally carried out. As a simple illustration, you may calibrate a DUT thermometer by measuring its temperature in water at its known boiling point (212 degrees Fahrenheit) in order to determine the thermometer's inaccuracy.

To obtain accurate readings, a thermometer must be calibrated because its precision is susceptible to deterioration over time. Thermometers can change over time for a variety of reasons.

Hence, The value that would be put in the numerator would be 10° C because difference between two marked values or space between two marked value is 10.

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Answer:

1653.21 cm

Explanation:

volume formula of rectangular prism is volume times height times width

40.1 times 4.457 times 9.25 = 1653.21

Answer:

The volume of cuboid is 1653.21 cm³

Step-by-step explanation:

GIVEN :

TO FIND :

USING FORMULA :

\(\quad{\star{\underline{\boxed{\sf{V_{(cuboid)} = lbh}}}}}\)

SOLUTION :

Substituting all the given values in the formula to find the volume of cuboid :

\(\quad{\longrightarrow{\sf{V_{(cuboid)} = lbh}}}\)

\(\quad{\longrightarrow{\sf{V_{(cuboid)} = l \times b \times h}}}\)

\(\quad{\longrightarrow{\sf{V_{(cuboid)} = 40.1 \times 4.457 \times 9.25}}}\)

\(\quad{\longrightarrow{\sf{V_{(cuboid)} = 178.7275 \times 9.25}}}\)

\(\quad{\longrightarrow{\sf{V_{(cuboid)} = 1653.21272}}}\)

\(\quad{\longrightarrow{\sf{V_{(cuboid)} \approx 1653.21}}}\)

\(\quad{\star{\underline{\boxed{\sf{V_{(cuboid)} = 1653.21 \: {cm}^{3}}}}}}\)

Hence, the volume of cuboid is 1653.21 cm³.

Answer: Florida

Explanation:

jus did it

Answer:

B. Florida

Explanation:

Answer:

The answer is A.

Explanation:

When acid react with metal carbonate, it will form salt, water and carbon dioxide.

For example :

HCl + CaCO3 → CaCl + H2O + CO2

Answer:

There are 30 atoms in total

Explanation:

There is 5 carbon, 5 of whatever A is and 4 oxygens but since the whole symbol has been multiplied by 5 there would be 20 oxygen

So 20 + 5 + 5 = 30 atoms

The standard molar enthalpy for the reaction C(s) + ½ O2(g) → CO(g) is -111KJ.

Molar enthalpy is the amount of energy per mole. In light of this, the primary distinction between enthalpy and molar enthalpy is that the former refers to the total heat content of a thermodynamic system, whereas the latter refers to the total heat per mole of reactant in the system.

C(s) + O₂(g) → CO₂(g)    ΔHO = -394 kJ ----(1)

CO₂(g) → CO(g) + 1/2O₂(g)      ΔHO = +283 kJ -----(2)

Adding 1 & 2

C(s) + ½ O₂(g) → CO(g)  

ΔHO = -394 kJ + 283 kJ

ΔHO = -111KJ.

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Complete question is " Find the standard molar enthalpy for the reaction C(s) + ½ 02(g) → CO(g)

Given that

C(s) + O2(g) → CO2(g) AHO = -394 kJ

CO2(g) → CO(g) + ¹/2O2(g) AHO = +283 kJ ".

Answer:

D. Carbon​.

Explanation:

Carbon can be mixed with Many things. for example, YOU are mostly made out of carbon. Other things include furniture, clothing, plastics, charcoal, pencil led, diamonds, and gas.

Answer:

b                                 xplanation:

Answer:

The answer is D..i.e phosphate. it consists of 1p and 4oxygen atoms

\(PO_4^{3-}\)  is a polyatomic ion. Hence, option D is correct.

What is a polyatomic ion?

Polyatomic ions are ions which consist of more than one atom.

The prefix poly- means many, so a polyatomic ion is an ion that contains more than one atom. This differentiates polyatomic ions from monatomic ions, which contain only one atom.

\(PO_4^{3-}\) is a chemical derivative of phosphoric acid with a chemical name Phosphate. Phosphate is also called Phosphate ion or Orthophosphate.

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There are several amino acids that are usually positive, or protonated, at physiological pH, which is around 7.4. These include histidine, lysine, and arginine.

Histidine has a side chain with a pKa of approximately 6.0, which means that at physiological pH, about half of the histidine molecules will be protonated and carry a positive charge. Lysine and arginine have side chains with even higher pKa values, around 10.8 and 12.5, respectively. As a result, almost all of the lysine and arginine molecules in a physiological environment will be protonated and positively charged. These positively charged amino acids play important roles in protein structure and function, as well as in enzyme catalysis and ion transport across cell membranes.
Amino acids that are usually positive or protonated at physiological pH (around 7.4) are lysine, arginine, and histidine. These amino acids contain basic side chains which can accept protons, making them positively charged under physiological conditions.

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Based on the data provided, the (a) Specific volume at the final state = 0.25 m³/kg ; (b) Work done by CO = 50.4 KJ ; (c) Heat transfer to CO = 100.4 KJ ; (d) The direction of heat transfer = from paddle wheel to CO.

Given data :

Mass of carbon monoxide (CO) = 4 kg

Volume of the tank = 1 m³

Energy transferred to CO by paddle wheel (W) = 14 W

Time = 1 hr

Increase in the specific internal energy of carbon monoxide (CO) = 10 kJ/kg

(a) Specific volume at the final state, in m³/kg can be calculated as follows :

Using the first law of thermodynamics : Q = ∆U + W …………………(1)

where,

Q = Heat transferred to CO

∆U = Change in internal energy of CO

W = Work done by CO

∆U = m × u₂ - m × u₁

where, m = Mass of CO, and u₂ = Final specific internal energy of CO

u₁ = Initial specific internal energy of CO

∴ u₂ = u₁ + (∆U / m)= u₁ + (10 × 10³ / 4) ………………(2)

Using ideal gas equation:P V = m R T

where,

P = Pressure of CO

V = Volume of CO

T = Temperature of CO = Constant

R = Gas constant

∴ Specific volume (v) of CO can be given by : v = V / m …………………(3)

(b) Work done by CO, W = Energy transferred to CO by the paddle wheel = 14 × 1 × 3600 ………………(4) = 50400 J

Heat transfer to CO, Q = ∆U + W - ∆K.E - ∆P.E

There is no change in kinetic energy and potential energy of the system.

Hence,∆K.E = ∆P.E = 0

∴ Q = ∆U + W ………………….(5)

Solving equations (2), (3), (4) and (5) we get : v = V/m = 1/4 = 0.25 m³/kg

Work done, W = 50400 J = 50.4 KJ

(c) Heat transferred, Q = ∆U + W= (4 × 10 × 10³) / 4 + 50400 = 100400 J = 100.4 KJ

(d) Heat is transferred from paddle wheel to the CO.

Therefore, the direction of heat transfer is from paddle wheel to CO.

Thus, the required answers are : (a) 0.25 m³/kg ; (b) 50.4 KJ ; (c) 100.4 KJ ; (d) from paddle wheel to CO

The complete question is : Four kilogram of carbon monoxide (CO) is contained in a rigid tank with a volume of 1 m3. The tank is fitted with a paddle wheel that transfers energy to the CO at a constant rate of 14 W for 1 h. During the process, the specific internal energy of the carbon monoxide increases by 10 kJ/kg. If no overall changes in kinetic and potential energy occur, determine

(a) the specific volume at the final state, in m3/kg.

(b) the energy transfer by work, in kJ.

(c) the energy transfer by heat transfer, in kJ.

(d) the direction of the heat transfer.

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Answer:

the kittens received half of their DNA from the mother cat

Answer:

C) the kittens received half of their genetic information from the mother cat

Explanation:

1. there was another answer

2. I took the test and I got 100% by choosing this answer

Have a good day!! :DD

Geologists use rock samples including sedimentary rocks as direct evidence and seismic waves as indirect evidence.

They are the types of rocks which are formed as a result of accumulation of minerals or organic particles at the surface of the earth.Sedimentation is the name given to a collective process which cause the particles to settle.

The study of sedimentary rocks is useful in civil engineering and as important sources of coal, fossil fuels and ores.The color of sedimentary rock is often determined by iron content and sometimes due to the presence of organic matter.

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Answer:

Dissolved minerals in the ground water precipitate (crystallize) from water in the pore spaces forming mineral crusts on the sedimentary grains, gradually cementing the sediments, thus forming a rock

Explanation:

Yes, an electron cause an electromagnetic wave to vibrate.

One of the waves is propagated by simultaneous periodic variations of electric and magnetic field intensity and that includes radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

Electromagnetic waves are produced when something vibrates—an electric charge that moves back and forth.

When an electric charge vibrates, the electric field around it changes. Because the electric charge is in motion, it also has a magnetic field around it.

This magnetic field also changes as the charge vibrates.

Therefore, an electron causes an electromagnetic wave to vibrate.

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Magnets on a railroad provide electricity to a train by electrifying the propulsion loops generates magnetic fields that both pull the train forward from the front and push it forward from behind.

A magnetic field is described as a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.

Electrodynamic suspension (EDS) uses superconducting electromagnets or strong permanent magnets that create a magnetic field, this  magnetic field induces currents in nearby metallic conductors when there is relative movement and hence  pushes and pulls the train towards the designed levitation position on the guide way thereby providing electricity.

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In the chemical equation of aluminium nitrate and sulfuric acid limiting reactant is sulfuric acid as it is present in small quantity.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

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Answer:

Go to your periodic table and look for each element. Find the mass for Aluminum, Nitrogen, Oxygen, and Hydrogen.

After you find those, for each compound you must add them together and find the least amount of sig figs after the decimal point.

For the first compound, Al(NO3)3, you will have a total of

1 Aluminum atom

3 Nitrogen atoms

9 Oxygen atoms

Aluminum has 26.982 g/mol

Nitrogen has 14.007 g/mol

Oxygen has 15.999 g/mol

Now multiply those numbers by the amount of atoms of each element.

(1)26.982 g/mol = 26.982 g/mol

(3)14.007 g/mol = 42.021 g/mol

(9)15.999 g/mol = 143.991 g/mol

now add all of those numbers together, and you see that their least significant figure after the decimal is 3, so round to 3 digits after the decimal point.

26.983 + 42.021 + 143.991 = 212.994

now do the same for the other compound

to start you off.. you have

6 Hydrogen atoms

3 Oxygen atoms

Hydrogen has 1.009 g/mol

Oxygen has 15.999 g/mol

the least significant figure after the decimal point is 3, so round you 3 digits after the decimal point.

after you finish getting your totals, you. until them and find the greatest sig fig over all. comment on this if you need further instruction :)

10mL of water in SX at 0.00003 g/cm3 The average density value in g/cm3 is 0.9982 and was calibrated at 15°C, 20°C, and 25°C.

Two teaspoons are equal to 10 mL. (2tsp). Three teaspoons make to one tablespoon, which is three times larger than a teaspoon (1Tbsp or 1Tb). 15 mL is also equal to one tablespoon.

The result is calculated by multiplying the entered milligramme by 0.001, since 1 milligramme is equal to 0.001 millilitres. When there are 15 milligrammes, for instance, 15 x 0.001 is 0.015 mL in the conversion of milligrammes to milliLitres.

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Answer:

6

Explanation:

Answer: Mg and Ca

Explanation:

In the modern periodic table, Mg and Ca are the last pair of elects for which Newlands' Law of Octaves would hold true.

Law of Octaves is the generalization that was made by Newlands. It states that when chemical elements are arranged based on their increasing atomic weight, then the ones that have the same chemical and physical properties will occur after an interval of seven elements.

In such a case, every eighth element will have identical properties when the elements in the periodic table are arranged based on their atomic masses.

Based on the above information, Magnesium (Mg) has an atomic number of 12 while Calcium (Ca) has an atomic number of 20. Therefore, the elements follow the law of Octaves as they have a difference of 8 in their atomic numbers.

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Answer:

Fluorine

Explanation:

Fluorine is the most electronegative element because it has 5 electrons in it's 2P shell.

Fluorine is the most reactive nonmetal and the most electronegative element in the periodic table, and hence it is the strongest oxidizing agent. Therefore, fluorine is more reactive than phosphorus.

The chemical element fluorine has an atomic number of 9 and the symbol F. The lightest halogen, it is an extremely poisonous, pale yellow diatomic gas under normal conditions. It is exceedingly reactive and reacts with all other elements, except the light inert gases, making it the most electronegative reactive element.

Of all the halogens, fluorine has the smallest atomic size. The nuclear attraction is therefore highest for the furthest electrons. Fluorine is the most reactive of the halogens.

Due to the angular strain in the P4 molecule, where the angles are only 60 degrees, white phosphorus is less stable and hence more reactive than the other solid phases under typical circumstances. White phosphorus is far more reactive than red phosphorus.

Thus, fluorine is more reactive than phosphorus.

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The term mole concept is used here to determine the theoretical yield of H₂. The theoretical yield of H₂ is 1.75 g and the moles of Fe is 10.8. The correct options are D and C.

One mole of a substance is defined as that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of Carbon - 12. The equation used to calculate the number of moles is:

Number of moles (n) = Given mass / Molar mass

The theoretical yield of H₂ is:

1. 3.5 × 1/2 = 1.75 g

2. The moles of Fe needed to react with 8.1 mole of O₂ is:

8.1 × 4 / 3 = 10.8 mole

Thus the correct options are D and C.

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Answer:

materials that allow heat to flow easily​ conductors of heat. For examples, aluminum, iron and copper.

Explanation:

Hope it helps!!!

A) To calculate the threshold frequency of light required to emit photoelectrons from K, we can use the equation:

E = hν

where E is the energy required to remove an electron (work function), h is the Planck's constant (6.62607015 × 10^-34 J·s), and ν is the frequency of light.

First, let's convert the work function from electron volts (eV) to joules (J):

Work function of K (ϕ(K)) = 2.2 eV = 2.2 × 1.60 × 10^-19 J = 3.52 × 10^-19 J

Now, we can rearrange the equation to solve for the frequency:

ν = E / h

ν(K) = ϕ(K) / h

Substituting the values:

ν(K) = 3.52 × 10^-19 J / (6.62607015 × 10^-34 J·s)

ν(K) ≈ 5.31 × 10^14 s^-1

Therefore, the threshold frequency of light required to emit photoelectrons from K is approximately 5.31 × 10^14 s^-1.

B) Similarly, to calculate the threshold frequency of light required to emit photoelectrons from Ni, we use the same equation:

ν(Ni) = ϕ(Ni) / h

where the work function of Ni (ϕ(Ni)) is 5.0 eV.

Converting the work function from eV to J:

Work function of Ni (ϕ(Ni)) = 5.0 eV = 5.0 × 1.60 × 10^-19 J = 8.00 × 10^-19 J

Substituting the values:

ν(Ni) = 8.00 × 10^-19 J / (6.62607015 × 10^-34 J·s)

ν(Ni) ≈ 1.21 × 10^15 s^-1

Therefore, the threshold frequency of light required to emit photoelectrons from Ni is approximately 1.21 × 10^15 s^-1.

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Answer:

Filtration

explanation:

Filtration is a separation method used to separate out pure substances in mixtures comprised of particles—some of which are large enough in size to be captured with a porous material. Particle size can vary considerably, given the type of mixture. For instance, stream water is a mixture that contains naturally occurring biological organisms like bacteria, viruses, and protozoa. Some water filters can filter out bacteria, the length of which are on the order of 1 micron. Other mixtures, like soil, have relatively large particle sizes, which can be filtered through something like a coffee filter.

Answer:

KBr final solution:

V = 250mL --> 0.25L

Concentration/Molarity = 1.5 mol/L

To find the amount of moles of KBr here, just multiply the volume by the concentration (0.25 x 1.5 = 0.375 mol)

So the amount of moles for KBr is 0.375 mol. Now we know that the mass divided by the molar mass (the atomic mass values of K and Br in the periodic table added together) would give us the amount of moles aswell.

n = moles

m = mass

M = molar mass

n = m/M

so if we rearrange this equation to find mass, we would get:

m = n x M

Molar mass for KBr: (39.09) of K + (79.90) of Br = 118.99

m = 0.375 mol    x    118.99

m = 44.62g

Therefore 44.62g of KBr is needed to make 250mL of a 1.5 M KBr solution.

BaCl₂ + Na₂(SO4)→ Ba(SO4) + 2NaCl the type of chemical reaction is taking place in this equation is double replacement reaction. Therefore, option 2 is correct.

The double replacement reaction is also called as double displacement reaction.

A general formula for a double replacement reaction is written as follows: AB + CD ⇒ AD + BC.

Examples of double replacement reactions are sodium hydroxide reacts with ammonium chloride to produced sodium chloride, ammonium hydroxide. NaOH + NH₄Cl ⇒ NaCl + NH₄OH.

When barium chloride solution reacts with sodium sulphate solution, a white precipitate of barium sulphate and sodium chloride are produced. This is double replacement reaction.

Thus, option 2 is correct.

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The correct expression for the solubility product constant, Ksp, for a solution of barium fluoride, BaF2, is:

Ksp = [Ba2+][F-]2

This expression represents the equilibrium constant for the dissolution of solid barium fluoride in water to form aqueous barium and fluoride ions, according to the balanced chemical equation:

BaF2(s) ⇌ Ba2+(aq) + 2F-(aq)

Note that the stoichiometry of the balanced equation determines the powers to which the concentrations of Ba2+ and F- are raised in the Ksp expression.

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