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True or false for these questions

Answer:

2H2+ 02-->2H20

So 4H2 + 202-->4H20

so the answer is 4 water molecules.

Answer:

The branch of knowledge dealing with engineering or applied sciences is called technology .

Hope this helps you!

Answer:

since you have not provided which units you want the conversion for I'll answer some of the common ones for atmospheric pressure :

to convert into pascal(pa)

you have the formula :

1 atm = 101325 pa

thus

0.200 atm = 20265 pa .

This problem is providing us with the reaction whereby tungsten is produced from tungsten (VI) oxide and hydrogen, so the percentage atom economy is required and found to be 64.3 % according to:

In the ambit of green chemistry, atom economy is one of the twelve principles of green chemistry, and tell us how efficient a chemical process is, in terms of the necessary reactants, versus the yielded products. In the ideal case, it is 100 % meaning that all the reactants lead to the desired product.

However, when byproducts are present, this percentage dwindles and the idea is to reason how convenient the process is. In this case, we can calculate the atom economy, by simply dividing the atomic mass of tungsten by the addition of the molar mass of tungsten (VI) oxide and three times that of waters:

\(\%A-E=\frac{183.84g/mol}{231.84g/mol+3*18.02g/mol} *100\%\\\\\%A-E=64.3\%\)

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Elements which have high electron negativity are more reactive than elements with low electron negativity.

This is because elements with high electron negativity will gain more electrons to become more stable.

When electron negativity of an element decrease it becomes more into its element form.

There will be more ionization energy of the elements who have more electron negativity.

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Answer:     An element will be more reactive if it has a very high or very low electronegativity.  

Is your answer

The energy is required to remove a proton from ¹⁵N₇ is

The reaction to remove the proton is given as follows :

¹⁵N₇  ---->   ¹⁴C₆  +  H

The mass of ¹⁵N₇   =  15.000109

the mass of ¹⁴C₆ = 14.003242

The mass of H = 1.007825

The energy requires to remove a proton is given as:

E = ( 14.003242 + 1.007825 - 15.000109) u

E = 0.010958 × 9312.5 MeV

E = 10.2046375 MeV

Thus, energy is required to remove a proton from ¹⁵N₇ with  the masses of the atoms ¹⁵N₇ , ¹⁴C₆ and H are 15.000109 u , 14.003242 u and 1.007825 u , respectively is 10.2046375 MeV.

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(a) N/N0 = 0.498

(b) N/N0 = 0.129

(c) N/N0 = 0.002

(a) The fraction of the tritium sample remaining after 3.60 years can be calculated using the formula N/N0 = (1/2)^(t / t1/2), where t is the time elapsed and t1/2 is the half-life. Plugging in the values, we get N/N0 = (1/2)^(3.60 / 12.32) ≈ 0.498.

(b) Similarly, for 10.9 years, N/N0 = (1/2)^(10.9 / 12.32) ≈ 0.129.

(c) For 123.2 years, N/N0 = (1/2)^(123.2 / 12.32) ≈ 0.002.

The calculations are based on the exponential decay model, where the fraction remaining is determined by the time elapsed divided by the half-life. As time increases, the fraction of tritium remaining decreases exponentially.

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Answer:

2Al + 3FeO->Al2O3+3Fe

Explanation:

plug in those numbers to balence the equation and yes Al2O3 does not have a number in front

Answer:

2Al +3FeO = 1 Al2O3 + 3Fe

Explanation:

you need 2 al on the left to get al2 on the right, and you need 3 o on the left to get o3 on the right. there's still 3 fe left over, so that's what you put there.

The ratio of the heat added to the system to the corresponding temperature change of the system is referred to as the d) heat capacity.

The heat capacity present in most systems is not constant, but depends on various conditions of the thermodynamic system. The heat capacity depends on the temperature itself, as well as the pressure and volume of the system.

Various ways to measure heat capacity can be done, which are generally carried out under conditions of constant pressure or constant volume. So that the specific capacity symbol is adjusted, becoming Cp for the specific capacity at constant pressure, and CV for the specific capacity at constant volume.

Gases and liquids are generally measured at constant volume. Measurements at constant pressure will produce a larger value because the constant pressure value also includes the heat energy used to do work to expand the volume of a substance when the temperature is increased.

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Answer:

Hunds rule is violated here.

Hunds rule : pairing of electrons takes place only if all the orbitals are filled with single electrons each.

Answer: Its A, provides landmarks, such as buildings

Explanation:

the person above me is wrong </3

Answer:

A (provides landmarks, such as buildings)

Explanation:

Satellite imagery is a useful tool used in GPS and many other forms of digital mapping. It is often extremely detailed and useful for looking at what buildings are where! :))

Answer:

Shaggy off the today science ka sara kam yyyyyy the today science and technology y rocks and minerals and vitamins a

Answer:

limitting reactant = 7.79g

excess reactant = 16.517g

percentage yild =145.05%

Explanation:

you can read and understand from the image okey

The final temperature of the gas is approximately 40.96 Kelvin.

To determine the final temperature of the gas, we can use the ideal gas law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin.

First, let's convert the given temperatures to Kelvin. We have:

Initial temperature: -125 degrees Celsius = 148 K (approximate)

Final temperature: Unknown

The initial conditions of the gas are as follows:

Initial pressure (P1) = 1.25 atm

Initial volume (V1) = 1250 mL = 1.25 L (since 1 L = 1000 mL)

Initial temperature (T1) = 148 K

The final conditions of the gas are as follows:

Final pressure (P2) = 50.0 atm

Final volume (V2) = 325 mL = 0.325 L

Final temperature (T2) = Unknown

Using the ideal gas law, we can set up the following equation:

(P1 * V1) / T1 = (P2 * V2) / T2

Substituting the known values:

(1.25 atm * 1.25 L) / 148 K = (50.0 atm * 0.325 L) / T2

Simplifying the equation:

T2 = (50.0 atm * 0.325 L * 148 K) / (1.25 atm * 1.25 L)

T2 = 40.96 K

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Answer:

B. Na

Explanation:

Once balanced you get 2Na + Cl₂ ⇒ 2NaCl. Sodium is the limiting reagent because it would produce the smallest amount of the product (NaCl)–while chlorine is the excess reagent. Based off of the Na in the balanced equation, it would produce 3 moles of NaCl, and for Cl₂ it would produce an excess of 6 moles of NaCl. [It'd be wise to utilize stoichiometric factors to get a good grasp of this]

Answer:

Mole fraction for C₂₂H₁₉Cl₂NO₃ = 0.0086

Explanation:

Mole fraction remains a sort of concentration. It indicates:

moles of solute / (moles of solute + moles of solvent)

Moles of solute / Total moles.

Solute: Cypermethrin → C₂₂H₁₉Cl₂NO₃

Solvent: Water (PM = 18g/mol)

We calculate moles from solvent: 1000g /18 g/mol = 55.5 moles

We calculate PM for C₂₂H₁₉Cl₂NO₃

12g/mol . 22 + 1g/mol . 19 + 35.45 g/mol . 2+ 14g/mol + 16g/mol . 3 = 416 g/m

Moles of solute: 200 g / 416g/mol = 0.481 moles

Total moles: 0.481 + 55.5 = 55.98 moles

Mole fraction for C₂₂H₁₉Cl₂NO₃ = 0.481 moles / 55.98 moles = 0.0086

Answer:

Molecularity is the number of ions or molecules that take part in the rate determining step

Order of reaction is the number of molecules of reactant whose concentration changes during the chemical change

Answer:

red dwarf, yellow dwarf, giant, supergiant

Explanation:

Super giants and giants tend to be the brightest of the bunch while the yellow dwarf is in its main sequence which is like the sun while the red dwarf is a low mass main sequence meaning low mass= low brightness

Answer:

7.00

Explanation:

Pure Water is the only purely neutral substance on earth so it has a neutral pH of 7

Answer:

1. Convert the mass of A to moles dividing in molar mass

2. Convert the moles of A to moles of D (2mol A = 3mol D)

3. Convert the moles of D to mass multiplying by its molar mass

Explanation:

As you can see in the equation, 2moles of A produce 3 moles of D, the equation is:

2mol A = 3mol D

But in the problem you are having the mass of A and you need the mass of D. That means you require to convert the mass of A to moles. With the moles of A you can find the moles of D and, as last, you need to convert the moles of A to mass.

To convert mass to moles or vice versa you must use Molar Mass. That means, the answer is:

The electronic configuration of Krypton is- 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6.

Answer:

na(s) +o2(g)=na2o

Explanation:

na2o2 is peroxide btw

Answer: stars vary in their effective temperature and colour. A hot star radiates more energy per second per metre surface area than a cooler star. Does this then mean that a hot star is going to appear brighter to us than a cooler one? The answer to this actually depends on a few factors

Explanation: pa brainiest po

The cultures of prehistoric humans are primarily known through the excavation of stone tools and other durable artifacts, such as the Oldowan and Acheulian tool traditions.

Stone tools and imperishable artifacts serve as key archaeological evidence for understanding prehistoric cultures. Through meticulous excavation and analysis, archaeologists have been able to piece together the lifestyles, technological advancements, and social behaviors of early human societies. The term "paleolithic" refers to the Old Stone Age, a time when humans relied on stone tools as their primary implements.

The Oldowan tool tradition is considered the earliest stone tool industry, dating back around 2.6 million years ago. It is characterized by simple tools, such as choppers and scrapers, which were crafted by flaking off pieces from larger stones. These tools were primarily used for basic activities like butchering and processing animal carcasses.

Later, the Acheulian tool tradition emerged around 1.76 million years ago, representing an advancement in stone tool technology. Acheulian tools, such as handaxes and cleavers, were more refined and standardized, showcasing an increased level of sophistication in tool-making techniques. These tools served a wide range of purposes, including hunting, woodworking, and shaping raw materials.

By studying the Oldowan and Acheulian tool traditions, researchers gain valuable insights into the cognitive abilities, cultural development, and technological progress of early humans. The examination of these artifacts provides evidence of their adaptability, problem-solving skills, and the gradual refinement of their tool-making techniques over time.

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Answer:

I guess second option i.e. More potential employment opportunities and revenue because collecting recyclable material needs manpower to collect them, and secondary employment in transport i.e. to collect all the material at one place we need transport and so on!

Answer:

sun gives you vitamin D

Explanation:

Our body creates vitamin D from direct sunlight on our skin when we're outdoors.