Which answer best describes what is happening in the following reaction?

2C8H18 + 25O2 Right arrow. 16CO2 + 18H2O
This is not a redox reaction. It is an example of combustion.
This is a redox reaction in which octane (C8H18) is oxidized.
This is a redox reaction in which carbon dioxide (CO2) burns due to ignition.
This is not a redox reaction, because a solution of carbon dioxide and water results.

Answer:

Either the first one or the third one.

Explanation:

Using process of elimination: knowing that the controlled variable is something the conductor is able to control and stays the same throughout; the amount of water is the same, but it also states that temperature is not the same throughout. This cancels out B because the amount of sugar dissolved varies and doesn’t stay the same. D fits the same criteria as well.

so now we are left with A and C.

An independent variable is something that can be by itself and doesn’t depend on anything else. Sugar is NOT independent, as it dissolves DEPENDING on the amount of liquid. So we can already rule out that sugar is a dependent variable. Both A and C have those choices though, so now we are with the control group and the independent variable.

Think about it, which is the independent variable? Water amount doesn’t depend on anything, while the temperature depends on the room. So the answer is most likely A.

Hope this helps, don’t stress about homework. Happy Holidays!

Answer:

C. CO

Explanation:

A molecule is a substance that is a combination of two or more atoms through a chemical bond while an element is a substance containing only one type of atom. However, some elements are also considered molecules because of having diatoms such as: Hydrogen, Oxygen, Chlorine, Bromine, Fluorine, Nitrogen and Iodine.

Among the choices above, it is only choice C (Carbon monoxide) that is a molecule. All the other options (Calcium, Cobalt and Copper) are elements. Carbon monoxide is a combination of one atom of carbon and another atom of oxygen.

The option that represents a molecule would be CO. That is option C.

A molecule is defined as the substance that is made up of two or more elements that are chemically combined together.

From the options give above, CO which is carbon monoxide is diatomic. This shows that it contains two elements making it a molecule.

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Answer:

58.3 cm

Explanation:

took the quiz.

Answer:

Sigma Bonds = 14

Pi bonds = 0

Explanation:

Butanol:

[tex]\sf CH_{3} -CH_{2}-CH_{2}-CH_{2}-OH[/tex]

There is no pi bond in this compound (since there is no double or triply bond)

So,

Pi bond = 0

Now, Coming towards sigma bonds

Sigma bonds = 3 (First carbon with hydrogen) + 2 (Second C with H) + 2 (Third C with H) + 2 (Fourth C with H) + 1 (Bond of O and H) + 4 (Bonds between C and C and C and O)

Sigma Bonds = 14

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Answer:

Its a

Explanation:

i took the quiz

The sentence that is inappropriate in an informational piece of writing with a formal tone is "People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play." The correct option is A.

In academic or professional settings, a formal writing tone is common. This tone emphasizes thoroughness and directness while remaining respectful.

It emphasizes facts and grammatical correctness and uses full words rather than contractions.

The use of standard English, more complex sentence structures, the infrequent use of personal pronouns, and the absence of colloquial or slang terms characterize formal language.

In informal language, nonstandard English forms, colloquial vocabulary, and typically shorter sentence structures are permitted.

"People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play," is an inappropriate sentence in a formal informational piece of writing.

Thus, the correct option is A.

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Answer:

V = 96.61 L

Explanation:

Given data:

Number of moles = 4.0 mol

Pressure = 780 torr (780/760 = 1.03 atm)

Temperature = 30°C

Volume of gas = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

30+273 = 303 K

1.03 atm × V = 4.0 mol × 0.0821 atm.L/ mol.K  × 303 K

V = 99.505 atm.L / 1.03 atm

V = 96.61 L

A) CaCl2

Calcium chloride is an inorganic compound, a salt with the chemical formula CaCl2. It is a colorless crystalline solid at room temperature, highly soluble in water.

Answer:

The Answer Is C

“Atomic mass” is relative to the isotope carbon-12 weighing exactly 12 atomic mass units. Therefore “atomic mass” is precisely the same as “relative atomic mass.”

Two further points:

First, atomic mass as stated on the periodic table is a average of the masses of an element’s naturally-occurring isotopes, weighted by their abundance. This is because atomic mass as normally used is a bulk property: we weigh out many trillions of atoms at a time, because we usually deal in macroscopic quantities. And that means that an average mass is more useful to us.

Second, all masses are relative masses (until the new, physical-constant-based kilogram comes online; and arguably even then). We mass something by comparing it to some standard of reference: until later this year, that something is a chunk of alloy in Paris, France. When the new standard comes into use, we will be comparing the kilogram’s gravitational mass to the strength of the electromagnetic force.

But that’s kind of trivial; it just stems from the fact that any and every measurement is a comparison to something else.

Edit: IUPAC, the world’s premier organization for the imposition of picky definitions that most people never need to use, has the following:

Atomic mass is the mass of a single atom; the unit is the Dalton or unified atomic mass unit. (I would use “isotopic mass” to specify the mass of a particular atom, but that’s not sanctioned by IUPAC.)

Relative atomic mass is the measured average mass of all atoms of a particular element in a particular sample. To make it unitless, it’s divided by the value of the unified atomic mass unit.

Standard atomic weight is the value you read off of the periodic table; it’s an Earth-based average over many samples, of experimental values of the relative atomic mass. Values are promulgated by the IUPAC Commission on Atomic Weights and Isotopic Abundances, and are revised every two years.

Most chemists refer to standard atomic weight as “atomic mass” or “atomic weight” and get on with their lives.

The unified atomic mass unit is 1/12 of the mass of an atom of carbon-12. It is sometimes called the Dalton.

Definitions taken from the IUPAC Gold Book.

As far as I can tell, relative atomic masses and standard atomic weights are made unitless so that they can be used with any convenient macroscopic mass unit to determine correct proportions for a desired chemical reaction.

Answer:

A

Explanation:

Answer:

A

Explanation:

Not D or B

Answer:

the bigger the size the more easier to see from a distance and the smaller the harder to see.

Explanation:

Answer:

Explanation:

The mass of the car can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{2000}{2.5} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

The constant can be calculated using the ratio of products to reactants when the equation has reached equilibrium. The equilibrium constant is often represented by the variable Keq, which is defined by the equilibrium constant expression

Answer:

A.hydrogen

Explanation:

A normal hydrogen (H) atom does not have any neutrons in its tiny nucleus

Answer:

Explanation:

An atom is the smallest unit of an element that can take part in a chemical reaction. Atoms (and there corresponding symbols) mentioned in the question are

Lithium ⇒ Li

Carbon ⇒ C

Nitrogen ⇒ N

Potassium ⇒ K

Oxygen ⇒ O

Iron ⇒ Fe

Chlorine ⇒ Cl

A compound is substance that contains two or more atoms that are chemically combined and can be represented with a chemical formula. The compounds (and there corresponding formula) mentioned in the question are

Water ⇒ H₂O

Edible salt (sodium chloride) ⇒ NaCl

Chalk (calcium carbonate) ⇒ CaCO₃

Lime (calcium oxide) ⇒ CaO

Iodides (such as sodium iodide and potassium iodide) ⇒ NaI and KI respectively

Answer:

D

C

Explanation:

Answer:

Calcium

2.8.8.2

last energy she'll got 2 electrons

as 2 valency

Answer:

134K

Explanation:

Using the ideal gas law equation;

PV = nRT

Where;

P = pressure (atm)

V = volume (Litres)

n = number of moles (mol)

R = gas constant (0.0821 Latm/Kmol)

T = temperature (K)

Based on the information provided, n = 1.4moles, P = 3.25atm, V = 4.738L, T = ?

3.25 × 4.738 = 1.4 × 0.0821 × T

15.3985 = 0.11494T

T = 15.3985/0.11494

T = 133.969

Approximately;

T = 134K

Answer:

Explanation:

Convection currents generated within the asthenosphere push magma upward through volcanic vents and spreading centres to create new crust.

Answer:

it is because a number of factors, including sample surface cleanliness and temperature, can prevent chunks of alkali metals from exploding on contact with water. The team eliminated those variables and others by using a sodium-potassium alloy that remains liquid at room temperature and a droplet delivery system featuring a calibrated syringe.

Answer: Potassium has a chloride mixture which makes it so sodium interacts easily with it to form the bond

Answer:

125 pounds = 56.6990463 kilograms

Explanation:

Answer:

Se requerirán 14.57 gramos de MgSO₄·7H₂O, que se disolverían en 105.43 gramos de agua.

Explanation:

Si tenemos 120 gramos de una solución al 10% de sulfato de magnesio en peso, habrán en la solución (120*10/100) 12 gramos de sulfato de magnesio (MgSO₄).

Sin embargo, el reactivo que está disponible es heptahidratado (MgSO₄·7H₂O), por lo que hay que calcular cuántos gramos de sulfato de magnesio heptahidratado contendrán 12 gramos de MgSO₄.

Calculamos las moles de 12 gramos de MgSO₄, usando su masa molecular:

Después calculamos la masa de MgSO₄·7H₂O que contendrá 0.0997 mol MgSO₄, usando la masa molecular de MgSO₄·7H₂O:

Para saber la cantidad de agua en la que se disolverá el reactivo, restamos la masa de soluto de la masa total de la solución:

Answer:

1: C

2: a

3: B

4: D

hope this helps

Answer:

B. The air pressure would increase 2X

Explanation:

Pressure = density × acceleration due to gravity × height

p = ρ × g × h

Pressure is force per unit area

p = F/a

Density is mass per unit volume

Pressure is directly proportional to density hence, any change in the density of a body directly affects the change in pressure of the body and vice versa.

Answer:

Anticline

Other than that Just A C:

Explanation:

Answer:

A

Explanation:

Answer:

D

they are used for manufacturing Of diodes

Answer:

is the answer D

Explanation:

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Explanation:

In methane the intermolecular forces are the weak London dispersion forces. Water molecules are held together by hydrogen bonding.

Hydrogen bonds holds water molecules together. Since it is a stronger bond, it confers a higher boiling point

Answer:

V₂  = 495.89 mL

Explanation:

Given data:

Initial number of moles = 0.213 mol

Initial volume = 652 mL

Final number of moles = 0.162 mol

Final volume = ?

Solution:

V₁/n₁    =    V₂/n₂

By putting values,

652 mL/0.213 mol   =  V₂ /0.162 mol

V₂  = 652 mL 0.162 mol /0.213 mol

V₂  = 105.62 mL.mol /0.213 mol

V₂  = 495.89 mL