witch of the following is not a method of heat transfer?
radiation Insulation Conduction Convection

Answer:

Mass = 11.23 g

Explanation:

Given data:

Mass of water produced = ?

Mass of ammonium nitrate decomposed = 25.0 g

Solution:

Chemical equation:

NH₄NO₃     →    N₂O + 2H₂O

Number of moles of NH₄NO₃ :

Number of moles = mass/molar mass

Number of moles = 25.0 g/ 80.0 g/mol

Number of moles = 0.312 mol

Now we will compare the moles of NH₄NO₃  and H₂O

            NH₄NO₃       :        H₂O

                1               :          2

             0.312          :       2/1×0.312 = 0.624 mol

Mass of water formed:

Mass = number of moles × molar mass

Mass = 0.624 mol × 18 g/mol

Mass = 11.23 g

11.23 grams of water produced from the decomposition of 25.00 grams of solid Ammonium Nitrate.

How we calculate moles from mass?

We can determine the moles of any substance by using the equation:

n = W /M, Where:

n = no. of moles

W = given mass

And M = molar mass

Given balanced equation is:

NH₄NO₃ → N₂O + 2H₂O

Also given that mass of NH₄NO₃ = 25 g

Mole of NH₄NO₃ = 25 / 80 = 0.312 mol

From the stoichiometry of the reaction, ratio between NH₄NO₃ and water is 1:2; it means one mole of NH₄NO₃ will produce 2 moles of water.

Moles of water formed = 2 × 0.312 = 0.624 mol

Now we convert this mole to grams through following way:

W = n × M

W = 0.624 × 18 = 11.23 grams

Hence, produced mass of water is 11.23 grams.

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Answer:

I hope it helps..... you can stop at the full-stop

O₂ as a limiting reactant

Given

28 moles of butene

228 moles of Oxygen

Required

Limiting reactant

Solution

We use the basis for the given reaction because for the name butane it should have the formula C₄H₁₀, while C₄H₈ is butene

Reaction(balanced)

C₄H₈ + 6 O₂ → 4 CO₂ + 4 H₂O

Find limitng reactant from mol : coefficient of reactants

C₄H₈ : 28 : 1 = 28

O₂ : 228 : 6 = 38

O₂ as a limiting reactant (smaller ratio)

Answer:

Genetic Variation

Explanation:

Gene flow — also called migration — is any movement of individuals, and/or the genetic material they carry, from one population to another. ... If gene versions are carried to a population where those gene versions previously did not exist, gene flow can be a very important source of genetic variation.

Answer:

mountains

Explanation:

mountains is the answer because mountains are just there doing nothing

Answer:

They may react in the air and become an acidic gases.

Answer:

B) the chemicals are gaining energy from the surroundings.

Explanation:

The positive sign of the energy difference in a chemical reaction would indicate that the chemicals are gaining energy from the surroundings. This is what happens in an endothermic reaction.

In an endothermic reaction, heat is absorbed from the surroundings hence the surrounding becomes colder at the end of the changes.

Answer:

B) 22 atoms

Explanation:

Aluminum Acetate has a formula of C6H9AlO6, meaning that it has 6 Carbon atoms, 9 Hydrogen atoms, 1 Aluminum atom, and 6 Oxygen atoms.

In total there are: 6+9+1+6 atoms, or a total of 22 atoms.

Hope this helps!

Answer:

The molecular or chemical formula of Aluminium Acetate is C6H9AlO6.

6-carbon atoms

9-hydrogen atoms

6-oxygen atoms

1-aluminium atom

b. 22 is the right answer

According to Newton's first law of motion,if a large rock hits the bike your body will fly forward as an external force is acting on it.

Motion is defined as a phenomenon which is described with respect to change in object's position with respect to time.It is given in terms of displacement,velocity,distance ,acceleration,speed.

Branch of physics which deals with motion of objects without any reference to it's cause is called kinematics while the branch which studies forces and their effects on motion is called as dynamics.

Motion applies to various systems like objects,bodies, matter particles ,radiation ,curvature.There are three laws of motion which are proposed by Newton.Classical mechanics is based on Newton's law of motion.Relativistic  mechanics is based on modern kinematics.

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Answer:

0.22moles of carbon dioxide

Explanation:

Given parameters:

Number of molecules of carbon dioxide  = 1.33 x 10²³molecules

Unknown:

Number of moles   = ?

Solution:

To solve this problem, we use the relationship below:

   1 mole of a substance contains 6.02 x 10²³moleccules;

So;

    1.33 x 10²³molecules will contain [tex]\frac{1.33 x 10^{23} }{6.02 x 10^{23} }[/tex]   = 0.22moles of carbon dioxide

Answer:

The correct answer is - false.

Explanation:

At the energy-generating station, when the coal is burned, the chemical energy store in the coal converted into thermal energy and light or luminous energy.

The thermic energy generated used to heat and boil the water or liquid to generate the gas and generate the kinetic energy to move the fan that is desgined to generate the electrical energy.

Thus, the statment is false statement as it does not convert into sound energy.

%yield = 91.8

Given

20 g NaCl

45 g AgCl

Required

%yield

Solution

Reaction

NaCl + AgNO₃ ⇒ AgCl + NaNO₃

mol NaCl :

= mass : MW

= 20 g : 58,44 g/mol

= 0.342

mol AgCl from equation :

= 1/1 x mol NaCl

= 1/1 x 0.342

= 0.342

Mass AgCl(theoretical) :

= mol x MW

= 0.342  x 143,32 g/mol

= 49.02 g

%yield = (actual/theoretical) x 100%

%yield = (45/49.02) x 100%

%yield = 91.8

Percentage % yield = 91.8%

Given:

20 g NaCl

45 g AgCl

To find:

% yield=?

The balanced chemical equation will be:

NaCl + AgNO₃ ⇒ AgCl + NaNO₃

First, we need to calculate moles of NaCl.

[tex]\text{Number of Moles}=\frac{\text{Given Mass}}{\text{Molar Mass}} \\\\\text{Number of Moles}=\frac{20}{58.44} \\\\\text{Number of Moles}= 0.342 moles[/tex]

Then, calculate moles of AgCl from equation:

[tex]\text{mol of AgCl}= 1/1 * \text{ mol NaCl}\\\\\text{mol of AgCl}= 1/1 * 0.342\\\\\text{mol of AgCl}= 0.342[/tex]

Mass AgCl(theoretical) :

[tex]\text{Mass of AgCl}= mol * MW\\\\\text{Mass of AgCl}= 0.342 x 143,32 g/mol\\\\\text{Mass of AgCl}= 49.02 g[/tex]

Now, calculate for percentage yield.

[tex]\%yield =\frac{actual}{theoretical} * 100\%\\\\\%yield = (45/49.02) * 100\%\\\\\%yield = 91.8\%[/tex]

The percentage yield will be 91.8%.

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Answer:

search it up ;)

Explanation:

Answer:

active transport

Explanation:

passive transport does not involve energy

Answer: The Law of Conservation of Mass

In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction. If we account for all reactants and products in a chemical reaction, the total mass will be the same at any point in time in any closed system.

In a chemical reaction, mass can neither be created nor be destroyed.

Answer:

8.33 meters per second

Explanation:

1500 meters/180 seconds=1500/180=8.3333 meters per second

Answer:

Molecular formula = C₂H₆

Explanation:

Given data:

Percentage of hydrogen = 20.0 %

Percentage of carbon = 80.0 %

Molar mass = 30.0 g  

Empirical formula = ?

Solution:

Number of gram atoms of H = 20 / 1.01 = 19.8  

Number of gram atoms of C = 80 /12 = 6.7

Atomic ratio:

            C              :           H            

         6.7/6.7        :        19.8/6.7  

            1               :           3        

C : H = 1 : 3

Empirical formula is CH₃.

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula = CH₃ = 12×1 +3×1.01 = 15.03 g/mol

n = 30 g/mol / 15.03 g/mol

n = 2

Molecular formula = n (empirical formula)

Molecular formula = 2 (CH₃)

Molecular formula = C₂H₆

Answer:

9.7 ml

Explanation:

Molarity = 2.5 M

Mass = 0.97g

Volume = ?

The relationship between these quantities is;

Molarity = Number of moles / Volume

Number of moles = Mass / Molar mass

Molar mass of NaOH = 40g/mol

Number of moles = 0.97 / 40  = 0.02425 mol

Volume = Number of moles / Molarity = 0.02425 / 2.5 = 0.0097 L

1000 ml = 1L

x = 0.0097 L

x = 0.0097 * 1000 = 9.7 ml

Mass of O₂ needed : = 57.408 g

Given

122 g of Aluminum oxide

Required

Mass of Oxygen

Solution

Reaction

4Al + 3O₂ → 2Al₂O₃

Mol Al₂O₃(MW=102 g/mol) :

= mass : MW

= 122 g : 102 g/mol

= 1.196

From the equation, mol ratio of O₂ : Al₂O₃ = 3 : 2, so mol O₂ :

= 3/2 x mol Al₂O₃

= 3/2 x 1.196

= 1.794

Mass O₂ (MW = 32 g/mol) :

= mol x MW

= 1.794 x 32

= 57.408 g

Answer:

Net: 1N

Explanation:

1.) Net:1N, direction: left

2.) Net: 1N, direction: down

3.) Net: 0N, no motion

4.) Net: 1N, direction: up

5.) Net: 1N, direction: up

The answer is B. the molar mass.

The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample, measured in moles.

Answer:

Ionic substance

Explanation:

An ionic substance is formed when oppositely charged ions link up to form an infinitely large lattice structure that can only be described in terms of unit cells.

Ionic substances may consist of billions of oppositely charged ions. Ionic substances are hard, have high melting and boiling points and do not conduct electricity in the solid state because the ions are not free in the solid state.

However, in solution or molten state, the substance conducts electricity since the ions which are the charge carriers are now mobile.

Answer:

Approx 32g

Explanation:

Oxygen has an atomic weight of 15.999. Times to is 32g

Answswer its a

Explanation:

i don't think it's any of these because divergent boundaries pull away from each other and convergent boundaries run into each other.

Answer: [tex]K_p=\frac{[H_2]^4}{[CH_4]^1[H_2O]^2}[/tex]

As value of K is greater than 1, the reaction is forward driven.

Explanation:

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. For equilibrium constant in terms of pressure , only gaseous reactants and products are considered.

For the given chemical reaction:

[tex]CaO(s)+CH_4(g)+2H_2O(g)\rightleftharpoons CaCO_3(s)+4H_2(g)[/tex]

The expression for [tex]K_p[/tex] is written as:

[tex]K_p=\frac{[H_2]^4}{[CH_4]^1[H_2O]^2}[/tex]  

As > 1, the reaction will be favoured in the forward direction and thus more products will be there.

Answer:

Reaction #4

Explanation:

Generally, combustion reactions produce water and carbon dioxide, and the fourth answer choice is the only one that produces both of these compounds. Therefore, the fourth answer choice is the only one that can be a combustion reaction.

Answer:  Solubility.

Explanation:

Solubility is defined as the maximum amount of solute dissolved per 100 g of the solvent at a certain fixed temperature to form a saturated solution.

STP condition is Standard Temperature and Pressure condition which is  temperature of 273 K and pressure of 1 atm.

Thus the scientific term for "the number of grams of solute dissolved in 100 g of the solvent to form a saturated solution at STP​" is called as Solubility.