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3 years ago

How is energy transferred when..

Chemistry

2 answers:

IgorLugansk [536]3 years ago

7 0

Answer:

1. Each collision passes energy from particles moving quickly to particles moving slowly. In this way, the energy spreads throughout the pan and finally reaches the handle. This process is called conduction. Conduction is the transfer of heat that happens when particles collide with each other.

2. A fire spreads by transferring heat energy in three ways: Radiation, Convection, and Conduction. Radiation refers to the emission of energy in rays or waves. Heat moves through space as energy waves. ... This is the reason that when facing the fire, only the front is warmed.

3. The ways in which energy is dissipated depends on the system: ... for a tumble dryer, the electrical work is transferred into useful internal (thermal) energy which helps to dry clothes and energy is dissipated wastefully by sound waves which cause a rise in the internal energy store (temperature) of the surroundings.

Explanation:

Hope this is what you were looking for! Brainliest please?

yanalaym [24]3 years ago

6 0

Answer:

Number 1 is Conduction. Number 2 is Radiation. Number 3 is Convection. i think if thats how im supposed to word it...

Explanation:

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You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO2. What is the percent yield of CO2?

liraira [26]

Answer:

79.14%

Explanation:

Given the equation : 2Fe2O3 + 3C 4Fe + 3C02

The theoretical yield of CO2 ; is 102.6g

Actual yield = 81.2 gram

Percentage yield = (actual yield / theoretical yield) * 100%

Percentage yield = (81.2 / 102.6) * 100%

Percentage yield = 0.7914230 * 100%

Percentage yield = 79.14%

Hence, tbe percentage yield of CO2 is 79.14%

4 0

3 years ago

An iron nail rusts when exposed to oxygen. According to the following reaction, how many grams of iron(III) oxide will be formed

natka813 [3]

Answer: 103.8 g of $Fe_2O_3$ , 0.65 moles of

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

$\text{Moles of} O_2=\frac{31.1}{32}=0.975moles$

Thus $O_2$ is the limiting reagent as it limits the formation of product and $Fe$ is the excess reagent.

$4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3$

According to stoichiometry :

3 moles of $O_2$ produce = 2 moles of $Fe_2O_3$

Thus 0.975 moles of $O_2$ will produce= $\frac{2}{3}\times 0.975=0.65moles$ of $Fe_2O_3$

Mass of $Fe_2O_3=moles\times {\text {Molar mass}}=0.65moles\times 159.69g/mol=103.8g$

Thus 103.8 g of $Fe_2O_3$ will be produced.

7 0

3 years ago

38.0 mL of a 0.026 M solution of HCl is needed to react completely with a 0.032 M NaOH solution. Calculate the number of moles o

svet-max [94.6K]

Answer:

The number of moles of HCl actually present is 0.000988

Explanation:

The balanced chemical equation of the given reaction is 

$HCl+NaOH \rightarrow NaCl+H_2 O$

Here one mole of HCl reacts with one mole of NaOH to form one mole of NaCl and one mole of water. Here the molarity of HCl is given as 0.026M.

molarity of NaOH is 0.032M 

molarity is the number of moles per unit volume of solution.

we have to calculate the number of moles in 36 mL of HCl.

38 mL=36/1000=0.038L 

the number of moles in 38 mL of HCl is given by 

no of moles = $0.026 \times 0.038=0.000988$ 

5 0

4 years ago

Which one from the drop down box

mel-nik [20]

CH4+ 2O2---> CO2+ 2H2O I believe would be correct.

7 0

4 years ago

The body’s pH is tightly regulated because specific enzymes function best within a narrow pH range. What is the approximate pH o

tatuchka [14]

Answer:

The answer to your question is pH = 9.08

Explanation:

Data

pH = ?

Concentration = 1.2 x 10⁻⁵ M

Process

1.- Calculate the pOH of the solution

Formula

pOH = -log[OH⁻]

pOH = -log[1.2 x 10⁻⁵]

pOH = 4.92

2.- Calculate the pH

Formula

pH = 14 - pOH

Substitution

pH = 14 - 4.92

Result

pH = 9.08

5 0

3 years ago