C3H8+3O2 = 3CO2+4H2O what is the enthalpy combustion

Answer:

A. Uni-cellular

Answer:

16 °C

Explanation:

Step 1: Given data

Step 2: Calculate the temperature change (ΔT) experienced by the metal

We will use the following expression.

Q = c × m × ΔT

ΔT = Q/c × m

ΔT = 811.68 J/(0.534 J/g.°C) × 95 g = 16 °C

Answer:

0.448 mols

Explanation:

Use balanced equation:

2H2 + O2 -> 2H2O

For every one mole of oxygen, there are two moles of water

hence the molar ratio 1:2

So if there are 0.224 mols of oxygen

Water = 0.224×2

Which is 0.448 mols of H20

Answer:

Rubber

Rubber

Make me brainlyist

Explanation:

Threshold frequency: Threshold frequency is the minimum frequency of the incident radiation below which photoelectric emission is not possible irrespective of the intensity of the incident radiation. ... Emitted electrons are called photoelectrons.

Hope this helps you dear :)

Good morning!

Answer:

1

because a dwarf star will seemlarge because of the in ability of any human being to see d sun

Answer:

by boiling water and add the salt

Explanation:

because salt dissolves better if mixed with hot water which makes the process faster and effective

Answer:

d. asteroids affected by Jupiter's gravity

Explanation:

A Trojan horse or Trojan is a type of malware that is often disguised as legitimate software. Trojans can be employed by cyber-thieves and hackers trying to gain access to users' systems. Users are typically tricked by some form of social engineering into loading and executing Trojans on their systems.

Answer:

D

Explanation:

D is the correct answer, they are planets that are close to the center star

Answer:

An exothermic reaction  

✔ produces energy

.

In an endothermic reaction, the energy of the products is  

✔ more than

the energy of the reactants.

Activation energy is  

✔ always greater than

the potential energy of the products

Answer:

Produces energy

More than

Always greater than

Explanation:

Answer: The concentration of [tex]H_2SO_4[/tex] is 0.234 M

Explanation:

According to the neutralization law,

[tex]n_1M_1V_1=n_2M_2V_2[/tex]

where,

[tex]n_1[/tex] = basicity [tex]H_2SO_4[/tex] = 2

[tex]M_1[/tex] = molarity of [tex]H_2SO_4[/tex] solution = ?

[tex]V_1[/tex] = volume of  [tex]H_2SO_4[/tex] solution = 50.0 ml

[tex]n_2[/tex] = acidity of [tex]NaOH[/tex] = 1

[tex]M_1[/tex] = molarity of [tex]NaOH[/tex] solution = 0.375 M

[tex]V_1[/tex] = volume of  [tex]NaOH[/tex] solution = 62.5 ml

Putting in the values we get:

[tex]2\times M_1\times 50.0=1\times 0.375\times 62.5[/tex]

[tex]M_1=0.234M[/tex]

Therefore concentration of [tex]H_2SO_4[/tex] is 0.234 M

Answer:

[tex]l=3.5*10^{-10}m[/tex]

Explanation:

From the question we are told that:

1st Energy     [tex]E_1=12eV=4(3eV)[/tex]

2nd Energy  [tex]E_2=27eV=9(3eV)[/tex]

3rd Energy   [tex]E_3=48eV=16(3eV)[/tex]

Generally the equation for Energy E for electron in one dimensional box at ground state [tex]E_0[/tex] is mathematically given by

  [tex]E_0=\frac{h}{8ml^2}[/tex]

  [tex]E_0=\frac{h}{8ml^2}[/tex]

Therefore Length a is mathematically given as

[tex]l=\sqrt{\frac{h^2}{8mE_0} }[/tex]

[tex]l=\sqrt{\frac{(6.625*10^{-34})^2}{8(9.1*19^{-31}{(3eV(1.6*10^{-19}))}}[/tex]

[tex]l=3.5*10^{-10}m[/tex]

Answer:

Driving to get supplies

Explanation:

Answer:

4.) 9, 1, and 4    5.) 4, 1, and 4

Explanation:

I am not quite sure about this because I cannot remember if the coefficient (the number before the elements) is applied to every element in the compound. If it is then your number of atoms are as follows: CORRECTION: you do not have to apply the coefficient to every element only the one that is after it. So when you back and fix the error your number of atoms will be as follows:

number 4

H: 9

P: 1

O: 4

number 5:

H: 4

S: 1

O: 4

you can calculate the number of atoms present in this compound by multiplying the coefficient and the subscripts of each atom.

hope this helped you :)

Answer:

I guess

Wave speed= Frequency x Wavelength

-> Wavelength= Wave speed divide Frequency

-> 50m/s divide 100Hz= 0.5m

I hope it help! :)

Answer:

KOH is a strong base, and therefore dissociates completely into negative  and positive ions in water solution. pH 8.35 is a high pH (> 7), therefore this is a basic solution. 4.

Explanation:

Answer:

A. CO

Explanation:

This is the answer I believe based on that it has the least amount of elements leading me to think that it would have the least ionic character.

The compound that contains a bond with the least ionic character is CO.

Ionic bonding involves transfer of valency electrons. Usually from a metal to a non metal.

The ionic character or nature of a bond is determined by the relative

electronegativity of the atoms involved.

So, the bigger the difference between the electronegativity of two atoms, the more likely it is to be ionic.

This simply implies that if the electronegativity differences of the atoms

involved are smaller, the ionic character will be small.

Therefore, the  compound that contain a bond with the least ionic character is CO.

The difference in negativity of the carbon and oxygen atoms are small, this is

why the compound CO among the options possess the least ionic character.

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Answer:

A five-sided polygon.- cyclopentane

A square.- cyclobutane

A five-sided polygon with one line extending from a point.- methylcyclopentane

A 6-sided polygon with a line extending from one point to a C H 3.- methlcyclohexane

Explanation:

The correct options are :

Cycloalkane is a cyclic hydrocarbon meaning that the carbon of the molecules is arranged in the form of a ring. These are also saturated and all of the carbon stems make up a ring.

These are monocyclic and made from hydrogen and carbon. One ring structure is named after cyclo. Cyclobutane is columns gases and is available in liquefied gas.

Find out more information about the cycloalkanes.

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Answer:

[tex]KI\\\\MgF_2[/tex]

Explanation:

Hello there!

In this case, since the Lewis dot structures are able to show the number bonds, required atoms and valence electrons of each bonding species, it is necessary to keep in mind that potassium has one valence electron, iodine has seven, magnesium has two and fluorine has seven; therefore, we can infer that the compound KI has one bond whereby iodine is able to attain the octet and the compound MgF needs two fluoride ions to fill out those two valence electrons of magnesium to obtain MgF₂, since the Lewis structures are:

[tex]K-I\\\\F-Mg-F[/tex]

Therefore, the chemical formulas are just:

[tex]KI\\\\MgF_2[/tex]

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Answer:(b) By referring to a periodic table or table of elements, we see that phosphorus (symbol P) has an atomic number of 15. Thus, each atom has 15 protons. The mass number of the ion is 15 + 16 = 31. Because the ion has 15 protons and 18 electrons (three more electrons than protons), its net charge is 3-

Answer:

Its a punnet square

Explanation:

As we move left to right across Period 3 from Sc to Zn, the energy needed to remove an electron from an atom generally increases.

Periodic table is the arrangement of chemical elements according to their atomic number in the tabular form. It is arranged from the lowest atomic number to highest atomic number i.e.  the total number of protons in the atomic nucleus are in the increasing order.

In this type of recurring pattern which is called as periodic law in their properties in which elements in the same column (group) have similar properties.

The horizontal rows which goes from left to right is called as periods (7 in numbers) where the vertical columns which goes from up to down are called groups (18 in numbers). There is a square for each element includes a number and letters. These letter are the chemical name for the element like Hydrogen is H but for silver it is Ag. The number present is the atomic number. There are total 118 elements but only 94 is naturally exist on Earth.

So, as we move left to right across Period 3 from Sc to Zn, the energy needed to remove an electron from an atom generally increases.

Learn more about Periodic table, here:

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Answer:

Some natural resources like sunlight and wind are found everywhere, but other natural resources are unevenly distributed. Resources like oil, coal, and natural gas are only found where conditions were favorable to grow and preserve large quantities of animal or plant matter.

Explanation:

Answer: it think it would be last one.  the mouth to the stomach is the answer.

Explanation:

Answer:

The correct answer is D! The esophagus connects the mouth to the stomach.

Explanation:

The mouth is connected to the esophagus, which in turn is connected to the throat. The throat, in turn, connects the mouth to the stomach.

I had this on a science test and I got it right :D

I hope this helps! ;)

Answer:

Explanation:

Start earning $78/hourly for working online from your home for few hours each day... Get regular payment on a weekly basis... All you need is a computer, internet connection and a little free time..... Read more here... www.Nifty2.com

Answer:

Cools Very Quickly

Explanation:

This is the right answer!