Please answer will give brainiest!

Answer:

Explanation:

In general, formation of bonds is always exothermic and bond breaking is always endothermic. In the methane-oxygen combustion reaction bonds in the reactants methane and oxygen are broken (endothermic) and bonds in carbon dioxide and water are formed (exothermic). One rule to keep in mind about all reactions whether overall energy change is endothermic or exothermic is that for the product compounds to form they must move to a lower energy level than the reactants. This will always translate into stronger bonds in the product compounds than the reactant compounds, otherwise the reaction would not occur.

Now, please understand that the energy lost on formation of each product compound (exothermic) is not the same as the 'overall' energy change of a reactions. Products form from elements with atomic structures ready to bond. The following diagram may be of interest in that it shows breaking of reactant bonds to push the elements into atomic states followed by bond formations to give product compounds.

CH₄ + 2O₂ => CO₂ + 2H₂O

 ↓ (endo)            ↑(exo)

     ··C·· + 4H· + 4·:O:·   <= (elements in atomic form ready to bond)

The above diagram refers to element to element interactions. The overall energy change of the reaction may be endothermic or exothermic. The combustion reactions are overall exothermic but the interaction of elements is endothermic for breaking reactant bonds and exothermic for formation of product bonds.

=> Sure hope this helps, but let me know if you need more explanations.

Answer:

Explanation:

Steroids have two principal biological functions: as important components of cell membranes which alter membrane fluidity; and as signaling molecules. Hundreds of steroids are found in plants, animals and fungi. All steroids are manufactured in cells from the sterols lanosterol (opisthokonts) or cycloartenol (plants).

Answer:

20

Explanation:

Answer:

The one inside with "+"--- Protons

The grey ones inside--neutrons

The ones on the electron orbits---electron

Everything is called an atom

Explanation:

Answer:

a. True

Explanation:

From Thomson's Plum Postulate on Pudding model of an atom, he posits that particle includes electrons that are encircled by a circle of positive charge to adjust the negative charges of electrons, which is fundamentally the same as way like negatively charged "plums" is getting encased by positively charged pudding.

Hence, the above statement is true.

interstitium

#keeponlearning

Answer:

pleura

Explanation:

The lungs are covered by a thin tissue layer called the pleura. The same kind of thin tissue lines the inside of the chest cavity -- also called pleura.

0.239 mol Sm(NO₃)₃

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[Given] 80.3 g Sm(NO₃)₃

[Solve] moles Sm(NO₃)₃

Step 2: Identify Conversions

[PT] Molar Mass of Sm - 150.36 g/mol

[PT] Molar Mass of N - 14.01 g/mol

[PT] Molar Mass of O - 16.00 g/mol

Molar Mass of Sm(NO₃)₃ - 150.36 + 3[14.01 + 3(16.00)] = 336.39 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

0.238711 mol Sm(NO₃)₃ ≈ 0.239 mol Sm(NO₃)₃

Answer:

a

Explanation:

because that is .y answee

Answer:f

Explanation:

Plz give brainlest

Answer: Ur answer would be C: Table sugar

Answer:

The cause of death is the specific injury or disease that leads to death. The manner of death is the determination of how the injury or disease leads to death.

Explanation:

.

Answer: they get their energy from the sun.

Explanation:

Answer:

B) occurs when objects rub against each other

Explanation:

Answer:

B. occurs when objects rub against each other

Explanation:

Friction is a force between two surfaces that are sliding, or trying to slide, across each other. ... Friction always works in the direction opposite to the direction in which the object is moving or trying to move. Friction always slows a moving object down.

Answer:

42.3moles

Explanation:

The chemical equation given in this question is as follows:

H2 + O2 → H2O

However, this equation is unbalanced, the balanced chemical equation is as follows:

2H2 + O2 → 2H2O

This equation shows that;

2 moles of hydrogen gas (H2) will produce 2 moles of water (H2O)

Hence, If 42.3 moles of water (H2O) are produced, 42.3 × 2/2

= 42.3moles of hydrogen was reacted.

Answer:

a. the water represents -- 3.the ocean

b. the sides of the tank represent   -- 4.continents

c. blowing through the straw represents  ---  2.prevailing winds

d. the moving pepper helps illustrate the movement of  --  1. currents

Explanation:

Answer:

speeds up, slows down, slows down, speeds up, slows down

Answer:

Mitochondria is a membrane-bound organelle stored in cells and their function is to generate chemical energy to power the cell's biochemical reaction.

The excretory system is an organ system that eliminates wastes, prevents harmful accumulation of chemicals in the body, and maintains the body's chemical concentration.

Explanation:

3.25 × 10²⁴ atoms are present in 5.40 moles of Copper, Cu.

Thus, option D is accurate.

A mole is a measurement of quantity. A fixed amount of something is represented by 1 mole.

Objects with dimensions on the atomic scale are counted using this unit.

According to formal definition, one mole of a substance has the same number of particles as atoms in a 12-gram sample of carbon-12.

Mole of Copper (n) = 5.40 mol   (Given)

We know that, one mole of particle contains Nₐ= 6.022 × 10²³ mol⁻¹ number of particles.  (Nₐ stands for Avogadro's Number)

Thus, the number of atoms in n = 5.40 mol of copper is:

N = Number of Moles × Number of molecules per mole

N = 5.40 mol × 6.022 × 10²³

N  =  3.25 × 10²⁴

Thus, 5.40 moles of Copper, Cu contains 3.25 × 10²⁴ atoms.

To know more about mole, refer to the below link :

https://brainly.com/question/22540912

#SPJ2

Answer:

MgBr2

Explanation:

On the periodic table, Magnesium has 2+ charge and Bromine has -1 charge.

You cross charges and get MgBr2

Magnesium and bromine react to produce magnesium bromide. The balanced chemical equation for this reaction is Mg + Br[tex]_2[/tex] [tex]\rightarrow[/tex]  MgBr[tex]_2[/tex].

An equation for just a chemical reaction is said to be balanced if both the reactants as well as the products have the same number of atoms and total charge for each component of the reaction. In other words, both side of the reaction have an equal balance of mass and charge.

This is accomplished by altering the compounds' coefficients.  In this example, the subscripts (tiny numbers towards the outside of some elements, including iron and oxygen) are never altered. Magnesium and bromine react to produce magnesium bromide. The balanced chemical equation for this reaction is Mg + Br[tex]_2[/tex] [tex]\rightarrow[/tex]  MgBr[tex]_2[/tex].

Therefore, the balanced chemical equation for this reaction is Mg + Br[tex]_2[/tex] [tex]\rightarrow[/tex]  MgBr[tex]_2[/tex].

To learn more about balanced equation, here:

https://brainly.com/question/29769009

#SPJ6

Answer:

A. Inflation pressure of the tyres

Explanation:

In an experiment, the independent variable is the variable that the experimenter changes or manipulates in order to induce a response in another variable called Dependent variable.

In this case in which an experiment was conducted on how inflation pressure of tyre affects a vehicle's maximum speed. The tyres of three different vans were used. The tyre of the first van were set at normal pressure of 35psi, the other van tyres were set at 40psi (overinflated) and 30psi (underinflated) respectively. This means that the INFLATION PRESSURES OF THE TYRES were the variable being changed, hence, is the INDEPENDENT VARIABLE.

Answer:

Explanation:

where is the pic?

Answer:

what are the following? if you can provide them I can try to answer it for you

Explanation:

Answer:

30 moles of ethanol are needed to prepare a 25 m solution, using 1200 g of water

Explanation:

This a short problem of solutions:

Our solute is ethanol: C₂H₅OH

Our solvent is water-

25 m, is our solution's concentration. m means molality (moles of solute contained in 1kg of solvent).

Our solvent mass is 1200g. We convert them to kg

1200 g . 1kg / 1000g = 1.2 kg

m = mol/kg → mol = m . kg

mol = 25 mol/kg . 1.2kg →30 moles

To solve this we must be knowing each and every concept related to enthalpy and its calculations. Therefore, H[tex]_2[/tex]O is the substances that releases the greatest amount of energy. The correct option is option D.

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.

Mathematically,

q = n ×ΔH

where

q = amount of heat

n = no of moles

ΔH = enthalpy

n = w / M.M

w = given mass

M.M = molar mass

H[tex]_2[/tex]O is the substances that releases the greatest amount of energy.

Therefore, H[tex]_2[/tex]O is the substances that releases the greatest amount of energy. The correct option is option D.

To know more about enthalpy, here:

brainly.com/question/24170335

#SPJ1

Answer:

Yes It was a 147 yr old knife it had been passed down for a few generations we were glad to find it again i will pas it down one day too

Explanation:

When we rediscover something that we had missed years ago we feel very happy. This happiness will come in everyone's face without any difference in the ages.

The term rediscover indicates to find something or someone again after losing or forgetting about it, him, or her for a long time. For example in child hood days we all have gone to parks. But now all those parks are a happy rediscovery of childhood.

When i was in the age of 5 my grandfather gifted me a beautiful necklace of gold. I used to wear that in all functions. But one day when i searched it was not at my room. I cried a lot during that time.

But after 5 years, when we are shifting to a new home all the places of our old home is cleaned. During cleaning i got my necklace from an old utensil in the store room. This time i just shocked, i didn't thought that it will again come into my hand.

To know more about discovery, visit;

https://brainly.com/question/28338261

#SPJ6

Answer: Chromium is less reactive as compared to Aluminium as it can not easily electrons as aluminium.

Explanation:

The arrangement of metals in a series according to the decreasing order of their reactivity is called reactivity series.

The metals that are placed above hydrogen are more reactive and those below hydrogen are less reactive.

A metal placed above another metal can displace lower metal from its salt solution. Thus a metal placed above in series is more reactive than metals placed below it.

As aluminium can easily lose electrons as compared to chromium , it is more reactive than Chromium.

Answer:

They are called downbursts.

Answer:

you speak spanish

speak spanish

Answer:

[tex]75.04gC_6H_{12}O_6[/tex]

Explanation:

Hello!

In this case, since one mol of any atom is related via the Avogadro's number and each mol of glucose has 6 moles of atoms of oxygen, it is possible to obtain the moles of glucose as shown below:

[tex]1.505x10^{24}atomsO*\frac{1molO}{6.022x10^{23}atoms O}*\frac{1molC_6H_{12}O_6}{6molO}\\\\=0.4165 mol C_6H_{12}O_6[/tex]

Thus, since the molar mass of glucose is 180.15 g/mol, the mass turns out to be:

[tex]0.4165mol*\frac{180.15g}{1mol} \\\\=75.04gC_6H_{12}O_6[/tex]

Best regards!