WHAT IS THIS SYMBOL AND HOW DO I FIND THIS?
I asked so many of my friends what this is but I don't know! I know that Ea is activation energy, but this is different.
I attached the graph and the question with the odd symbol.
I will mark Brainliest!

Answer:

Compounds

Explanation:

A compound is a substance formed when two or more elements are chemically joined. (For example Water, salt, and sugar are compounds.) When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of.

Answer:

weak bonds require less energy to form bonds than strong bonds

Answer: 140

Explanation:

Given the following :

Mass of metal = 18g = 0.018kg

Mass of water (calorimeter) = 21g = 0.021kg

Initial temperature of metal = 273 + 96 = 369k

Initial temperature of water = 273 + 24 = 297k

Final temperature inside calorimeter = 273 + 26 = 299k

Temperature change of metal = 299 - 369= -70k

Temperature change of water = 299 - 297 = 2k

H = mc ΔT

m = mass

c = specific heat capacity

ΔT = change in temperature

Heat lost by metal = heat gained by water

mc ΔT = mc ΔT

Specific heat capacity of water = 4200

18 * C * ( 299 - 369 ) = 21 * 4.2 * ( 299 - 297)

0.018 × C × -70 = 0.021 × 4.2 × 2

- 1.26 × C = 0.1764

C = 176.4/1.26

C = 140

Answer:

Option A. 2, 3, 2

Explanation:

We'll begin by balancing the equation. This can be achieved by doing the following:

Fe + Cl2 —> FeCl3

There are 2 atoms of Cl on the left side and 3 atoms on the right side. It can be balance by putting 3 in front of Cl2 and 2 in front of FeCl3 as shown below:

Fe + 3Cl2 —> 2FeCl3

There are 2 atoms of Fe on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Fe as shown below:

2Fe + 3Cl2 —> 2FeCl3

Now the equation is balanced.

The coefficients are : 2, 3, 2

Answer:

On the left side of calcium atom.

Explanation:

There are two dots are present on the left side of calcium atom which represents the unpaired electrons present in the outermost shell. This structure is presented by Lewis in order to show the number of unpaired electrons in the atom. if the calcium atom loses these two electron during a chemical reaction so the two dots disappear and the calcium atom is now stable.

Answer:

the electrons in the fourth shell

Explanation:

the Lewis electron dot diagram represents the valence electrons, in the case of calcium, the V.E. are in the fourth shell

Answer:

LPG -Liquefied Petroleum Gas. CNG-Compressed Natural Gas.

May this help you

Hey!!!

LPG=Liquified Petroleum Gas

Or,

Liquid petrol Gas

CNG=Compressed Natural Gas

Hope it helps....

Good luck on your assignment

Answer:

Combined with Hydrogen

Explanation:

This might help you with your question.

This is a person who scientific researches to make more knowledge in a certain area of interest

Answer:

NUCLEAR ENERGY -----> MECHANICAL ENERGY -------> THERMAL ENERGY --------> ELECTRICAL ENERGY

Explanation:

In nuclear reactor, various energy transformations occur in order to generate electricity. Nuclear reactor converts the energy released from nuclear fission and the heat generated is removed from the reactor by a cooling system where steam is generated. The steam then drives a turbine which powers a generator to produce electricity.

A nuclear reactor is hence an equipment where nuclear chain reactions occur and control can be obtained. The nuclear reactor uses mostly uranium-235 and Plutonium-239. When these radioactive substances absorbs neutrons, they undergo nuclear fission causing the nucleus to split into two or more smaller compounds with  the release of kinetic energy a form of mechanical energy, gamma radiations and others.The kinetic energy is then harnessed in the equipment as heat (thermal energy) which is received by a cooling system and steam is generated. The steam can then power the generator from which electricity is obtained (electrical energy).

So therefore, in a nuclear reactor, the nuclear energy is transformed to mechanical energy and then thermal energy which powers the generation of the electrical energy.

Answer:

nuclear energy Right arrow. mechanical energy Right arrow. thermal energy Right arrow. electrical energy or (A)

Explanation:

Answer:

284.395332

Explanation:

1 mole= 36.46094

so multiply 36.46094 times 7.8

and you get 284.395332

hope that helped ! Please mark brainliest I only need one more.

Answer:

Final pressure = [tex]4.31atm[/tex]

Explanation:

According to Gay-Lussac's law the pressure of a given mass of gas varies directly with the absolute temperature of the gas, provided the volume is kept constant.

SEE THE ATTACHMENT BELOW FOR STEP BY STEP EXPLANATION

Answer:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

The total ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and are represented as ions.

The net ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and do not show the spectator ions which are same in the reactants and the products.

a) zinc nitrate + calcium sulphide [tex]\rightarrow [/tex] zinc sulphide + calcium nitrate

balance equation : [tex]Zn(NO_3)_2(aq)+CaS(aq)\rightarrow ZnS(s)+Ca(NO_3)_2(aq)[/tex]

total ionic equation :

[tex]Zn^{2+}(aq)+2NO_3^-(aq)+Ca^{2+}(aq)+S^{2-}(aq)\rightarrow ZnS(s)+Ca^{2+}(aq)+2NO_3^-(aq)[/tex]

net ionic equation :

[tex]Zn^{2+}(aq)++S^{2-}(aq)\rightarrow ZnS(s)[/tex]

b) potassium + calcium chloride  [tex]\rightarrow [/tex] potassium chloride + calcium

balance equation : [tex]2K(s)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(s)[/tex]

total ionic equation :

[tex]2K(s)+Ca^{2+}(aq)+2Cl^-(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca[/tex]

net ionic equation: [tex]2K(s)+Ca^{2+}(aq)+\rightarrow 2K^+(aq)++Ca[/tex]

Answer:

Final pressure is 0.956 atm

Explanation:

Based on Boyle's law, "The volume of an ideal gas is inversely proportional to the pressure when temperature is constant". The equation is:

P₁V₁ = P₂V₂

Where 1 represents initial state and 2 final state of the gas.

If a gas has 239L and 2.00 atm as initial state. If the final volume is 500L:

239Lₓ2.00atm =  P₂500L

239Lₓ2.00atm / 500L =  P₂

0.956atm =  P₂

Answer:

a) The temperature of the water will rise by maximum 100 K, steam by 143.9 K

b) The temperature of the water will rise by maximum 100 K, steam by 1077.45 K

c) The temperature of the water will rise by maximum 100 K, steam by 972.75 K

d) The temperature of the water will rise by maximum 100 K, steam by 1027.86 K

e) The temperature of the water will rise by maximum 100 K, steam by 902.6 K

Explanation:

a) ΔH for ethanol = 29.65 kJ/g therefore, burning 100 g will produce;

29.65 × 100 = 2965 kJ

The specific heat capacity of water = 4.184 J/(g·K)

Therefore, 2965000= 1000 × 4.184 × ΔT

ΔT = 2965000 ÷ (1000 × 4.184) = 708.65 K

Latent heat of water = 2260 kJ/kg will be absorbed when the temperature reaches the boiling point of water hence we have

2965 - 2260 = 705 kJ to heat the water of which a maximum of 418.4 will boil the water and the steam temperature will rise by (705-418.4)/1.996 = 143.59 K

b) For Hexane: ΔH = 48.29 kJ/g

100 g will produce 4829 kJ

∴ Temperature change for the 1 kg water is given as follows

ΔT = 4829000 ÷ (1000 × 4.184) = 1154.16 K

However

4829 - 2260 = 2569

2569 - 418.4 = 2150.6

2150.6 / 1.996 = 1077.45 K

The final steam temperature will rise by 1077.45 K

c) For Kerosene(C₁₂H₂₆): ΔH = 46.2 kJ/g

100 g will produce 4620 kJ

∴ Hypothetically the temperature change for the 1 kg water is given as follows

ΔT = 4620000 ÷ (1000 × 4.184) = 1104.21 K

However

4620 - 2260 = 2360

2360 - 418.4 = 1941.6

1941.6 / 1.996 = 972.75 K

The final steam temperature will rise by 972.75 K

d) For Car Fuel(90% octane): ΔH = 47.3 kJ/g

100 g will produce 4730 kJ

∴ Temperature change for the 1 kg water is given as follows

ΔT = 4730000 ÷ 4184 = 1130.5 K

However

4730 - 2260 = 2470

2470 - 418.4 = 2051.6

2051.6 / 1.996 = 1027.86 K

The final steam temperature will rise by 1027.86 K

e) For Diesel (C₁₂H₂₃): ΔH = 44.8 kJ/g

100 g will produce 4480 kJ

∴ Temperature change for the 1 kg water is given as follows

ΔT = 4480000 ÷ 4184 = 1070.75 K.

However

4480 - 2260 = 2220

2220 - 418.4 = 1801.6

1801.6 / 1.996 = 902.6 K

The final steam temperature will rise by 902.6 K.

Answer:

i think its metal pipes

Explanation:

sorry if im wrong

Answer:

C- transforemed or changed

Explanation:

matter can be changed by application of heat or cold

Answer:

B

Explanation:

By using coulombs law meaning the amount of force between two stationary electrically charged particles

Answer:

nice question dont know the answer tho

Statement of Dalton's theory which is no longer used today is that matter is composed of small tiny particles called atoms as there are sub-atomic particles which are discovered.

Matter is a substance which is made up of various types of particles  which occupy space and have inertia . All living things and objects  are made up of various types of particles  that occupy space and have inertia .

Depending on temperature and other factors matter is able to exist in different phases. Most common of which are solid, liquid and gas. Matter can exist in more than one state depending on the temperature  and pressure .

State of matter can be changed  by heating or cooling and even by changing the applied pressure.When a state changes matter does not break rather its state changes though its chemical composition remains same.

Physical characteristics of matter are shape, color, size and temperature. Every matter is made up of elements which  cannot be broken down further by ordinary chemical reactions.

Learn more about matter,here:

https://brainly.com/question/12972782

#SPJ2

Answer:

get a little more than that is a great deal for the company and inventor of a company how can we get u a great job with their best friend in a few months but il will send you i will be the only person I know of fishes and the best I have to ask me to make it to my own home wifi and I am grade up to the same thing and the same way of the American people I have a lot to make a simple one person

Answer:

The chemical equation is;

Ca3(PO4)2 + 8C ———> Ca3P2 + 8CO

Explanation:

Here, we are interested in writing a chemical equation that is useful in the reduction of phosphorite.

We should understand that to be able to reduce phosphorite, there is need for a reducing agent.

Solid carbon can be used here.

The products formed are shown in the equation as follows;

Ca3(PO4)2 + 8C ———> Ca3P2 + 8CO

Answer:

get alcohol, and put it on a cloth then wipe it

Explanation:

the medical alcohol btw, not the one you drink lol

idk if it'll work wit paint but for sure with the marker

Answer:

For the marker, if it’s permanent then you should pour a little bit of nail polish remover ON THE STAIN and scrub it off with a paper towel.

For the paint, you can try using paint thinner, but this only works for a wood table that isn’t painted so I wojldnt reccomend that. Idk what to do with the paint tbh. But the first tip for the nail polish definitely works.

Answer:

try to give away its two outer electron to another atom

Explanation:

Answer: Number of protons and number of valance electrons.

Explanation:

There are three factors which determine metallic bond strength. greater the no of protons, greater will be attraction between nucleus and valance shell electrons and stronger will be metallic bond. greater no of valance electron, greater will be attractions between nucleus and electrons and stronger will be bond.

Answer:

K: +1

Br: +7

O: -2

Explanation:

O is always -2

K is in group one, so that is its charge

-8+1 is -7, so we flip the sign and that becomes Br

The reason why we flip it is to get a net balance of 0

Answer:

Yes, i'm gay.

Have a nice day!!

~Narancia

Answer:

The concentration of the potassium ions in ppm is 137.5 ppm

Explanation:

Here, we are interested in calculating the concentration of the potassium ions in ppm.

Mathematically, the term ppm which is read as parts per million is = mg of solute/liter of solution

We already have the mg of solute as 55mg

all we need now is the liters of solution

But what we have is 400 ml which is read as 400 milliliters

Mathematically, 1000 ml = 1l

Thus 400 ml = 400/1000 L = 0.4 L

Now the ppm = 55mg/0.4L = 137.5 mg/L or simply 137.5 ppm

Answer:

yes because I wouldn't do it

Answer:

11.2 moles of KNO3 will be required to prepare 8.0 L of 1.40 M KNO3

Explanation:

To answer this question, we need an understanding of the units of the term called molarity.

1.40M KNO3 means that there are 1.4 moles per dm^3 or per liter of the solution.

Now, since there are 1.4 moles in 1 liter

x moles will be present in 8.0 liters

Thus, mathematically;

x * 1 = 8 * 1.4

x = 11.2 moles

Answer:

Heat of fusion

Explanation: