I need help with this

Explanation:

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Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products. These reactions lower the temperature of their surrounding area, thereby creating a cooling effect. Physical processes can be endothermic as well – Ice cubes absorb heat energy from their surroundings and melt to form liquid water (no chemical bonds are broken or formed).

When a chemical bond is broken, it is usually accompanied by a release of energy. Similarly, the formation of chemical bonds requires an input of energy. The energy supplied/released can be of various forms (such as heat, light, and electricity). Endothermic reactions generally involve the formation of chemical bonds through the absorption of heat from the surroundings. On the other hand, exothermic reactions involve the release of heat energy generated from bond-breakage.

Endothermic Reaction Examples

Ammonium nitrate (NH4NO3), an important component in instant cold packs, dissociates into the ammonium cation (NH4+) and the nitrate anion (NO3–) when dissolved in water

Answer:Hydrogen and Helium

Explanation: Young stars would contain first hydrogen, then helium.

Young stars, just beginning their life in the galaxy, would contain mostly hydrogen and helium. That is option D.

A young star is a newly formed luminous object that is found in the galaxy.

The young star is mostly made up of two very light elements called hydrogen and helium. They also shine by conversion of hydrogen into more helium.

Therefore, Young stars, just beginning their life in the galaxy, would contain mostly hydrogen and helium.

Learn more about galaxy here:

https://brainly.com/question/1995133

#SPJ2

The second volume :   V₂= 884.14 L

Given

955 L at 58 C and 108 KPa

76 C and 123 KPa

Required

The second volume

Solution

T₁ = 58 + 273 = 331 K

P₁ = 108 kPa

V₁ = 955 L

P₂ = 123 kPa

T₂ = 76 + 273 = 349

Use combine gas law :

P₁V₁/T₁ = P₂V₂/T₂

Input the value :

108 x 955/331 = 123 x V₂/349

V₂= 884.14 L

Moles of Oxygen produced : = 1.836

Given

Reaction

2KClO₃ = 2KCl +3O₂​

Required

moles of Oxygen

Solution

moles of Potassium chlorate(122.5 g/mol) :

= mass : MW

= 150 g : 122.5 g/mol

= 1.224

From the equation,mol ratio of KClO₃ : O₂ = 2 :3 , so mol O2 :

= 3/2 x mol KClO₃

= 3/2 x 1.224

= 1.836

Answer:

The English and French versions of the list of ingredients must begin on a separate line, except, for small packages with an available display surface (ADS) of less than 100 cm 2, where the second language version of the list of ingredients may start after the end of the first language list [B.01.008.2(9), FDR].

Explanation:

Answer:

The atom resembles plum pudding

Explanation:

The discovery of the electron in 1897 by J. J Thomson and the proton in 1917 by Rutherford most directly refuted or replace the idea that the atom resembles plum pudding.

Answer:

The parts of an atom are electrons, usually found in an electron shell around the nucleus of the atom, and protons and neutrons, found in the nucleus of the atom. Typically, electrons are gained or lost in order to obtain charge.

Answer:

B) The molecules were closer together when the juice pop was frozen.

Answer:

5.88 x 10⁻⁴Hz

Explanation:

Given parameters:

Wavelength = 510 x 10⁹m

Unknown:

Frequency  = ?

Solution:

To solve this expression, we use the equation below:

             V  = f∧

V is the velocity  = 3 x 10⁸m/s

f is the frequency

∧ is the wavelength

          3 x 10⁸   = f x 510 x 10⁹

       f  = 5.88 x 10⁻⁴Hz

Answer:

0.012× 10⁻²³ moles of iron

Explanation:

Given data:

Number of moles of iron = ?

Number of iron atoms = 0.0723 atom

Solution:

Avogadro number:

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

0.0723 atom × 1 mol / 6.022 × 10²³ atoms

0.012× 10⁻²³ mol

The new temperature(T₂) : T₂=596 K = 323 °C

Given

T₁ = 25 C + 273 = 298 K

V₁ = 10 m³

V₂ = 20 m³(doubled)

Required

The new temperature(T₂)

Solution

Charles's Law  

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]

Input the value :

T₂=(V₂.T₁)/V₁

T₂=(20.298)/10

T₂=596 K = 323 °C

Answer:

Br₂ + BeF₂ → BeBr₂ + F₂

Bromine gas reacts with beryllium fluoride to produce beryllium bromide and fluorine gas.

Explanation:

This is a single replacement reaction in which bromine replaces fluorine.

Hope that helps.

Answer:

[Fusion: Nuclei Fuse together and release energy]  [Fission: Pressure and energy is released. This release of energy, is what causes the unstable atom to split to an isotope. I hope this helps!]

[isotopes can split too. At least some.]

Explanation:

Imagine you are trying to push something heavy, fusion is how you can join together and help each other to push this heavy material.

Fun fact! Heavier materials have more inertia against other forces acting on them.

You push harder, harder and harder! Until its pushed.

This will release a lot of energy which escalates to an extended length.

It might not be the finest example, it helped me to understand the basics.

Fission. Imagine having so much energy, in this case, try thinking of so many people in a tight space. What do you do? You will eventually start to escape and leave the room. This is the act of splitting the atom.

This won't be the same than how it was before.

Again, Energy is released (energy!!).

For anyone struggling with this, although it might not be the best idea, I would recommend researching the more advaced options for this topic.

This will give you a wide range of information which can develop your current knowledge about, "Nuclear Fission and Fusion."

It will be difficult, it definitely was for me when I was a child (starting to study science).    

Just keep trying, you'll get it.

Difference between molecular weight and molar mass

Hint : Molar mass of molecules is also called molecular weight . Its unit is gram per mole. We can calculate molar mass of molecule with the help of following rules; ... Molar mass of nitric acid (HNO3) =atomic mass of hydrogen + atomic mass of nitrogen +3× atomic mass of oxygen .

Answer:

answer

Explanation:

Sorry I do not know the answer, hope you have a great day

Answer:

Answer. 0.400 mol N2O5 contains 2.41 molecules of N2O5

Explanation:

Answer:

2m/s

Explanation:

2meters/second

Answer:

I think true

if wrong correct me plsssssss

I will always help you understanding your assingments

enjoy your day

#Captainpower:)

Answer:

It is a commonly observed fact that the yield of benzene and other aromatic hydrocarbons is greatest when the heat is intense, or its application to the vaporized hydrocarbons prolonged, ...TRUE

[tex]\displaystyle 0.1 \ mol \ Fe[/tex]

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

6.022 × 10²² atoms Fe (iron)

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Answer:

D. Gravity and inertia

When it happens orbital motion occurs

Answer:

180g

Explanation:

El soluto y el solvente son los componentes químicos que se mezclan en una solución. El soluto es una sustancia química, la cual puede poseer diferentes estados de agregación (es decir, sólido, líquido o gaseoso), que se se disuelve en un solvente; mientras que el solvente es una sustancia en estado líquído en la cual se diluye el soluto, formando una solución. La solubilidad de una sustancia química se define como la proporción en que una cantidad determinada soluto puede disolverse en una determinada cantidad de un solvente, a una temperatura específica. En este caso, 240 gramos (g) corresponde al 100% del contenido total de la solución, con lo cual la cantidad de solvente (agua) de una solución al 25% correspondería a la siguiente fórmula:

X = (75 x 240g) / 100

X = 180g

Answer:

C.

Explanation:

It is a different type of the same atom

they have a different number of neurons

Answer: The first question’s answer is 2 and the second question answer is 3. 12.B, 13.C

Explanation:

Answer:

D

Explanation:

ive watched this on a national geo show. But remind me again what is 1 Au and 3DO AU i forgot...

Answer:Name and Title:

Colleen DeBruin, Hillary Mulkavits, 11/18/2020, compounds lab.

Objectives(s):

to build chemical compounds from known elements

Hypothesis:

if I use oxygen hydrogen and carbon then I can make five new compounds in four minutes

Procedure:

The materials and procedures are listed in your virtual lab. You do not need to repeat them here. However, you should note if you experienced any errors or other factors that might affect your outcome. Using your summary questions at the end of your virtual lab activity, please clearly define the dependent and independent variables of the experiment.

Data:

Record the composition of each of your compounds below. Be sure to include the number of atoms for each element. An example has been supplied for you.

Compound Name Chemical Formula Sodium (Na) Atoms Calcium (Ca) Atoms Hydrogen (H) Atoms Oxygen (O) Atoms Carbon (C) Atoms Chlorine (Cl) Atoms

Ex: Sodium

hypochlorite NaClO 1 0 0 1 0 1

Water H20 o 0 1 2 0 0

Glucose C6H12O6 0 0 12 6 6 0

Formic/methanoic acid HCOOH 0 0 2 2 1 0

Butanoic Acid C3H7COOH 0 0 8 2 4 0

Carbon Dioxide C02 0 0 0 2 1 0

Carbon Monoxide CO 0 0 0 1 1 0

Fructose C6H12O6 0 0 12 6 6 0

0 0 0

0 0 0

0 0 0

Conclusion:

Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words.

I found as many combinations of carbon hydrogen and oxygen as possible

If there is a job that combines elements you would be doing that every day making it an every day matter

elements are like people, they are all different causing them to react differently and be more reactive

H20 has four because there are 2 oxygen and one hydrogen because of the numbers in the name of the compound

Yes because two elements can form two different types of bonds causing different outcomes

Explanation:

Answer:

Explanation:

Hydrolysis is a chemical decomposition involving breaking of a bond and the addition of elements

of water. In this hydrolysis of ester (ethyl acetate) with an alkali (sodium hydroxide), HCl was

used as catalyst to accelerate it. 1ml and 2ml of ethyl acetate was injected separately into the

500ml reactor vessels which contains 0.05N of NaOH and thoroughly mixed. At regular time

interval, 0, 10, 20, 30, 40, and 90 minutes, 25ml of each of the samples were withdrawn into a

250ml conical flask containing 0.05N HCl, and titrated against 0.05N NaOH solution using

phenolphthalein as indicator. From the titre values, the hydrolysis involving the 1ml ethyl acetate

was faster than that of the 2ml ethyl acetate, indicating that the higher the concentration the faster

the rate of reaction. The rate constant after evaluation from the graphs was approximately

0.003min-1

cm-3

for the 1ml and 2ml ethyl acetate, signifying that while the r