How is the delta H fusion used to calculate the energy released when a volume of liquid freezes

Answer:

5.60 Liters at STP

Explanation:

First you need the balanced reaction equation

2 H2 +  O2   ====>   2  H2O

4 g of oxygen ( O2 )  is   4/(15.999*2) moles of O2     (using periodic table)

  Twice the number of moles of H2O re produced   (from equation)

     at STP the volume of a mole of gas is 22.4 liter/ mole

       put all of this together  

         2 *   4 / (15.999*2) moles * 22.4 L/mole = 5.60 L

Answer:

4.21778 J/(g*C)

Explanation:

specific heat = joules / (mass times temperature change)

949 / (9 times 25)

949 / 225 =

4.21778

Answer:

The one that is in dark green is (New Hampshire)

if that's not what tell me i will fix it

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Answer:

Apply cool compresses to the skin. Use topical treatments to relieve itching, including calamine lotion, oatmeal baths, Tecnu, Zanfel, or aluminum acetate (Domeboro solution). Oral antihistamines, such as diphenhydramine (Benadryl), can also help relieve itching.

Answer:

The oceans obtained freshwater from glaciers melting. The freshwater was then trapped into small places below waves, which could be a reason why there is not much freshwater in the world.

Answer:

1. We get the symbol and formulas of the reactants and products.

2. The physical state of the reactants and products.

3. From this reaction, we can know the molecular formula of ammonia, water and nitrogen.

4. Here all the species are in a gaseous state.

5. The reaction takes place at a high temperature and pressure.

6. Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. This equation is written as:

Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. This equation is written as: Zn+H2SO 4→ZnSO 4 +H2.

Dish of Cabbage, carrot, pea, cauliflower and brinjal are the meals we could enjoy that contain only plant products.

Cabbage, carrot, pea, cauliflower and brinjal are the five different plants based meals. In these meals, vegetables are used which are the parts of plant. We know that vegetables are very healthy and nutritive which can be get from plants.

So we can conclude that dish of Cabbage, carrot, pea, cauliflower and brinjal are the meals we could enjoy that contain only plant products.

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The phase of water at 0.5 atm and 100°C is gaseous phase.

Water exists in three different phases such as liquid, gas, and solid.

The phase of the given water can be determined using phase diagram at standard temperature and pressure as shown in the image uploaded.

At 0.5 atm and 100 °C, the water is still in vapour or gaseous phase.

Thus, the phase of water at 0.5 atm and 100°C is gaseous phase.

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Answer:

299.60 g

Explanation:

Use the formula q = mCΔT (q= heat, m= mass, c = specific heat for that specific substance, ΔT is change in temperature Final Temp - Initial Temp)

Released heat means it has negative sign.

q = mCΔT

-2744 = (mass) (0.129) (19-90)

mass= 299.60 g

Answer:

The pressure of a given amount of gas is directly proportional to the temperature at a given volume. When the temperature of a system goes up, the pressure also goes up, and vice versa. The relationship between pressure and temperature of a gas is stated by the Gay-Lussac's law.

The best explanation would be that the temperature of the gas has dropped before measuring the pressure.

According to pressure law, the pressure of a gas is directly proportional to its temperature, provided the volume of the gas remains constant.

Thus, since the initial pressure of the gas was calculated to be 7.5 atm, the temperature of the gas must have dropped in order for the measured pressure to be 7.1 atm.

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Answer:

False.

Explanation:

Humans are made of matter too :)

Answer:

Wax

Explanation:

The combustible material in a candle or its fuel is wax. Before the wax can become fuel, it first needs to get hot enough. To start that heating process, you first need to light the wick with another source of fire, such as a match. As the wick burns down the heat of the flame melts the wax around the wick.

Covalent bonding is the sharing of electrons between atoms. The electronegativity difference of 1.7 is the largest for a bond to be covalent. Thus, option B is accurate.

The electronegativity difference is the parameter used to determine the polarity and the type of the bond formed by the atom of the species. it gives the measure of the atom to attract the shared electrons.

For a covalent bond to form the electronegativity difference between the two atoms of the molecules must be less than 2. A difference of more than 2 results in ionic bond formation.

Therefore, option B. 1.7 is the highest electronegativity difference for a covalent bond formation.

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We know the formula

C is concentration and V is volume

The new volume will be by using the relation between molarity and volume formula.

Molarity, also termed as molar concentration in a solution, is a method of determining how much material is present in a chemical solution.

Calculation of volume with the aid of molarity formula is shown below:

Volume is calculated by using the molarity formula.

[tex]M_{1} V_{1} = M_{2} V_{2}[/tex]

Where, M is molarity and V is volume.

It is given that, [tex]M_{1}[/tex] = 0.750 M , [tex]M_{2}[/tex] = 0.500 M, [tex]V_{1}[/tex] = 275 ml .

Now, put the value of given data in molarity formula.

[tex]M_{1} V_{1} = M_{2} V_{2}\\V_{2} = M_{1} V_{1} / M_{2}\\V_{2} = (0.750 M) (275 ml) / 0.500 M\\V_{2} = 183.34 ml[/tex]

Therefore, the volume will be 183.34 ml.

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Considering the Hess's Law, the desired enthalpy is obtained through adding intermediate reactions together. (option D)

Hess's law, also called Law can also be called Law of additivity of the enthalpies of reaction, it is a useful method when it is not possible to calculate the enthalpies of reaction from the enthalpies of formation, or in reactions in which the reaction enthalpy cannot be determined experimentally because it is very slow or very explosive.

Hess's law states that when reactants are converted to products, the enthalpy change is the same whether the reaction takes place in one step or in a series of steps.

In this way, Hess's Law determines that when a chemical reaction can be expressed as an algebraic sum of other reactions, its reaction enthalpy is equal to the sum of the enthalpies of the partial reactions. In this way, it allows thermochemical equations to be treated as algebraic equations, and can be added, subtracted, or multiplied by a number to find the desired thermochemical equation.

Hess's Law states that the sum of the ∆H of each stage of the reaction will give us a value equal to the ∆H of the reaction when it occurs in a single stage.

That is, the desired enthalpy is obtained through adding intermediate reactions together. (option D)

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Answer:

keep it from being washed away by water

The total pressure of gasses (nitrogen and oxygen) in the flask is determined as 3 atm.

The balanced chemical equation of nitrogen gas and oxygen gas is determined as follows;

N₂  + 2O₂  → 2NO₂

PV = nRT

P(total) = P(N₂) + PO₂

P(total) = 1 atm + 2(1 atm)

P(total) = 3 atm

Thus, the total pressure of gasses (nitrogen and oxygen) in the flask is determined as 3 atm.

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Answer:

A. They insulate the bears and allow them to blend in with their environment

As both the ions have charge of +2 the compound formed is PbMg as the like charges will cancel out each other.

An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.

Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.Ions of opposite charges combine in ionic compounds.

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Answer:

1.6 x 10^4

Explanation:

16,340

with 2 significant figures is

16000

in scientific notation

is 1.6 × 10^4

because 10^4 means

if you move the decimal point 4 spaces then

1.6 becomes 16000

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Answer:

Boiling: The process of conversion from liquid to gas on heating is called boiling.

Example: Water on heating turns into water vapour.

Melting: The process of conversion from solid to liquid at room temperature is called melting.

Example: Ice cream melting at room temperature.

Sublimation: The Conversion of solid to gas directly is called sublimation.

Example: Camphor, Dry ice

Explanation:

Hope it helps you:))))

Answer:

Explanation:

lewis dot structure:

Carbon has 4 valence electrons and hydrogen has 1 electron. Therefore, in below given way, the lewis dot structure for H[tex]_2[/tex]CCCl[tex]_2[/tex] can be drawn.

These illustrations, commonly referred to as lewis structures and electron dot structures, show how electrons are distributed and grouped around atoms.

You must be aware of the total amount of valence electron cloud in order to create the Lewis structure. Based on the atom's group number inside the periodic table, it is possible to determine how many valence electrons are present in a certain atom. Carbon has 4 valence electrons and hydrogen has 1 electron. The lewis dot structure for  H[tex]_2[/tex]CCCl[tex]_2[/tex] is given below.

Therefore, in above given way, the lewis dot structure for H[tex]_2[/tex]CCCl[tex]_2[/tex] can be drawn.

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Answer:

on-skin silicone, liquid latex, and gelatine

Explanation:

hope this helps:)

Answer:

it would occur when there are two different metals involved.

Answer:

C

Explanation:

The powdered iron has a greater surface area than the single piece of metal, allowing reactions to be done faster.

It's NOT A because in the reaction Iron is a reactant NOT a catalyst

It's NOT B because it's completely irrelevant to the question

It's NOT D because it's also not relevant to the question at hand

The hypothesis as to why the sisters have different statures occurs because from genetics we know that it is linked to the alleles so one sister is shorter than the other one was they had different alleles.

On average, siblings share about 50% of their DNA with each other, but some siblings share even more and some less. So while we all have approximately 50% DNA from each parent, the segments we end up getting are completely random.

Hereditary character or gene that is manifested by the absence of the opposite gene, called dominant, in this case, Kiera is extremely short for her age.

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