hello people ~
The combustion reaction which occurs on its own, without any external supply of heat is called as:

A. Explosion

B. Spontaneous combustion

C. Fire

D. Rapid combustion​

Answer:

As water is boiled, kinetic energy causes the hydrogen bonds to break completely and allows water molecules to escape into the air as gas (steam or water vapor). When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding.

Explanation:

1) elements are composed of atoms, which are the tiny building blocks that compose matter.

2) Atoms resemble a solar system: the sun being the nucleus (protons and neutrons) and the electrons being the planets that orbit the nucleus.

3) Mostly everything (food, electronics, animals, plants, air)

4) The # of protons in the element

5) The same elements that were forged by stars are also present in us

Answer:

Brain

Explanation:

It's obviously the brain everyone knows that. Its not gonna be the heart or the lungs is it. The brain is most active at night while the body is sleeping xoxo. Also it links with how we see things and the nerve system but i aint got time to go into detail lots of love guvan

Brain is the organ system coordinates the action of the body.

Organ system is defined as a biological system made up of a collection of organs that collaborate to carry out one or more functions. The function of organ system are helps the body filter out dangerous metabolites, alcohol, narcotics, and other hazardous substances. Managing the amounts of several vital substances in the blood, such as amino acids. Creating bile acid. blood is sanitized by some microorganisms.

Brain is defined as a remarkable three-pound organ that regulates every bodily process, processes information from the outside world, and embodies the spirit and mind. The brain is arguably the most important organ in the human body. It regulates and coordinates every aspect of who we are as people, including our capacity for thought and feeling, as well as our capacity for memories and emotions.

Thus, brain is the organ system coordinates the action of the body.

To learn more about organ system, refer to the link below:

https://brainly.com/question/13278945

#SPJ6

Answer:

[tex]\huge\boxed{\sf 186.59\ L}[/tex]

Explanation:

Given that:

No. of moles = 8.33 mol

At STP, 1 mol. of all gases has a molar value of 22.4 dm³/mol

So,

Volume of 8.33 mol of N₂ gas:

= no. of moles x molar value

= 8.33 x 22.4

= 186.59 dm³

Since 1 dm³ = 1 L

So,

Volume = 186.59 L

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

pasagot nga po please need lang po talaga.

Answer:

Explanation:

T1 = 25C = 298.15 K

P1 = 2.0 atm

V1 = 1.00 L

T2 = 125C = 398.15 K

P2 = 12.0 atm

V2 = ?

P1V1/T1 = P2V2/T2 must be changed to T2P1V1/T1/P2

398.15 x 2.0 x 1.00 ÷ 298.15 ÷ 12.0 = V2

So 0.223 L is the answer!!

Answer:

Ca2B6O11·5H2O

Explanation:

colemanite, borate mineral, hydrated calcium borate (Ca2B6O11·5H2O) that was the principal source of borax until the 1930s.

Answer:

Decomposition reaction

Explanation:

2Ag₂O => 4Ag + O₂

As silver oxide is split into silver metal and oxygen gas, it can be classified as decomposition reaction.

Answer:

the boiling point of HF is higher than H2 and F2

Explanation:

it is because inter molecular give is present in HF because of the Hydrogen bond present. Hydrogen bond is strong and will require much energy to break ,since no hydrogen bond is in the rest H2 and F2 has a low boiling point

The boiling point of a liquid depends upon the pressure of the surrounding. Here HF has higher boiling than the molecule of hydrogen and fluorine due to the presence of hydrogen bonding between 'H' and 'F' atoms.

The temperature at which the vapor pressure of the liquid becomes equal to the atmospheric pressure of the liquid's environment is defined as the boiling point. A t this temperature, the liquid is converted into a vapour.

The intermolecular forces can be used to predict the relative boiling points. If stronger is the intermolecular force, the lower is the vapor pressure of the substance and the higher is the boiling point.

The order of intermolecular forces are:

H - bonding > dipole-dipole > London dispersion (Van der Waals)

Here HF has intermolecular hydrogen bonding which is not present in H₂ and F₂ and has high boiling point.

To know more about boiling point, visit;

https://brainly.com/question/16945842

#SPJ7

Answer: who is post malone

Explanation:

Answer:

Select the letter of the correct answer.

A vertical skateboard ramp is 12.5 feet high. The staircase leading to the top of the ramp is 15 feet long. How far away from the bottom of the ramp is the bottom of the staircase? Round your answer to the nearest tenth of a foot.

Press enter to interact with the item, and press tab button or down arrow until reaching the Submit button once the item is selected

A8.3 feet

B8.4 feet

C8.0 feet

D8.2 feet

Explanation:

so can someone help me please i only have 15 mins left !!!!!

A reagent that could be added to a mixture of [tex]Ag^+[/tex] and [tex]Cu^{2+}[/tex] to separate this two species is hydrochloric acid (HCl).

A separation technique can be defined as a technique that is used to separate (convert) two or more mixture and solution of chemical substances into distinct products such as solutes, chemical compounds or elements.

In this scenario, a reagent that could be added to a mixture of [tex]Ag^+[/tex] and [tex]Cu^{2+}[/tex] to separate this two species is hydrochloric acid (HCl). As HCl is added to this mixture, a white precipitate would be formed by silver ions ([tex]Ag^+[/tex]) while the copper ion ([tex]Cu^{2+}[/tex]) would form a maroon precipitate.

In conclusion, the above confirmation test should be done when hydrochloric acid (HCl) is added to a mixture of [tex]Ag^+[/tex] and [tex]Cu^{2+}[/tex] as a reagent.

Read more on separation technique here: brainly.com/question/4980962

Answer:

Your answer I believe will be C. To determine the probability that an offspring would have a specific trait.

Answer:

Its D. All of the above

Answer: There is gas produced.

Explanation:

After waking up one morning the smell of bacon was noticed. This was made possible due to the gas produce from the chemical reaction taking place during the process of making the bacon.

This gases are produced from the cooking of the bacon ( meat ), on the fire using cooking oil and all other ingredients.

Answer:

water

Explanation:

you can go longer without food than you can with water.

Answer:

Thus, when 2.5 mol of oxygen reacted with hydrogen, 2 * 2.5 mol = 5 so its A

Answer:

Compound

Explanation:

Compounds consists of atoms of two or more different elements that are chemically bonded together.

The series along which the bond angle is increasing is: C. H2O NH3 CH4.

Bond angle refers to the geometric angle that actually exists between angles that are adjacent to each other. It is also known to be the angle that is formed by three contiguous atoms.

We can see that as we move from H2O to NH3 then to CH4, the bond angle increases.

Learn more about bond angle on https://brainly.com/question/25425872

Answer:

Boron and/or Polonium

Explanation:

In the periodic table, you can see a stair-stepped line starting at Boron (B), atomic number 5, and going all the way down to Polonium (Po), atomic number 84. Except for Germanium (Ge) and Antimony (Sb), all the elements to the left of that line can be classified as metals.

Answer:

The pelvic bones of whales are one of the classic examples of a vestigial structure. In most animals, the pelvic bones are needed to be able to move the lower or rear set of limbs for the purpose of locomotion.

Density = Mass/Volume but it can also be rearranged to:

Mass = Volume x Density

Given in the question:

Volume - 240 cm3

Density - 15 g/cm3

Calculation

Mass = Volume x Density

= 240 x 15

= 3600g

Therefore, the mass of the box is 3600g so the answer is C.

Since Russia and the U.S.A have discovered new features on planets using spacecraft in modern times, this is an example of: C. how contributions by many different cultures throughout history have advanced our understanding of the solar system.

A solar system can be defined as a collection of the outer and inner astronomical or planetary bodies (planets) alongside the Moon that are in orbit around the Sun, in slightly elliptical orbits.  

Culture simply refers to the general way of life of people in a specific society or geographical area. This ultimately implies that, culture is a terminology which can be used to describe a sum total of the norms, beliefs, clothes, language, foods, and behaviors which a group of people that are living in a geographical area share in common.

In this context, we can reasonably infer and logically deduce that contributions by various cultures around the world have helped us to advance our understanding of the solar system.

Read more on culture here: brainly.com/question/25671025

#SPJ1

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass of gold bar = 34.5 g

volume = 17 mL

We have

[tex]density = \frac{34.5}{17} \\ = 2.02941176...[/tex]

We have the final answer as

Hope this helps you

Explanation:

[tex]19.87mol \times \frac{22.4lit}{1mol} = 445.088 lit[/tex]