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4 years ago

Count the atoms in each formula from the reactions here:

Chemistry

1 answer:

drek231 [11]4 years ago

7 0

Answer:

Part A: (on left side)

Hydrogen= 511
Carbon=7
Oxygen= 3
Sodium= 1

Part B: (on the right side)

Hydrogen= 511
Carbon=7
Oxygen= 3
Sodium= 1

Here is the thing, for a chemical equation, both sides have same number of atoms, even though the compounds are different

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The student plans to conduct a spectrophotometric analysis to determine the concentration of Cu2+(aq) in a solution. The solutio

mestny [16]

Answer:

The wavelength the student should use is 700 nm.

Explanation:

Attached below you can find the diagram I found for this question elsewhere.

Because the idea is to minimize the interference of the Co⁺²(aq) species, we should <u>choose a wavelength in which its absorbance is minimum</u>.

At 400 nm Co⁺²(aq) shows no absorbance, however neither does Cu⁺²(aq). While at 700 nm Co⁺²(aq) shows no absorbance and Cu⁺²(aq) does.

7 0

3 years ago

Given the following equation: 4 Fe + 3022 Fe2O3 What mass of iron is needed

icang [17]

Answer : The mass of iron needed is 29.5 grams.

Explanation : Given,

Mass of $O_2$ = 12 g

Molar mass of $O_2$ = 32 g/mol

First we have to calculate the moles of $O_2$ .

$\text{Moles of }O_2=\frac{\text{Given mass }O_2}{\text{Molar mass }O_2}$

$\text{Moles of }O_2=\frac{12g}{32g/mol}=0.375mol$

Now we have to calculate the moles of $Fe$

The balanced chemical equation is:

$4Fe+3O_2\rightarrow 2Fe_2O_3$

From the reaction, we conclude that

As, 3 moles of $O_2$ react with 4 moles of $Fe$

So, 0.375 mole of $O_2$ react with $\frac{4}{3}\times 0.375=0.5$ mole of $Fe$

Now we have to calculate the mass of $Fe$

$\text{ Mass of }Fe=\text{ Moles of }Fe\times \text{ Molar mass of }Fe$

Molar mass of $Fe$ = 59 g/mole

$\text{ Mass of }Fe=(0.5moles)\times (59g/mole)=29.5g$

Therefore, the mass of iron needed is 29.5 grams.

8 0

4 years ago

PLEASE HELP ME WITH THISSSS!!!

Lilit [14]

16) you can tell which craters are younger by them being small and you can tell which craters are older by them being larger.

17) The larger craters experienced energetic impacts because they are simply larger in size which makes them being impacted.

Hope this was helpful have a nice day :)

4 0

3 years ago

Define and describe each of the following forms of energy and then classify each as either: potential energy, kinetic energy, or

TiliK225 [7]

Potential energy: It is an energy stored in an object due to its position.

Chemical energy: It is an energy stored in a bonds of a chemical compound and this energy is released during the reaction in the form of heat.

Elastic energy: It is a stored potential energy in an elastic object when subjected to any deformation or change in shape.

Gravitational energy : It is an energy possessed by an object due its position in a gravitational field.

Electric energy: Energy due to flow of charged particles. It is a type of a stored potential energy due to relative position of charged particle .

Nuclear energy : it is an energy stored in a nucleus of an atom. This energy kept the particles present inside the nucleus binded together.

Static electricity: It is an electricity which arises due to presence of imbalance in charge within or on the surface of the material.

Transfer of some quantity of energy:

Heat energy: Transfer or flow of energy from one object to another in form of heat. This transfer is due to difference in temperature of two objects.

Electromagnetic energy: It is an form of energy emitted by the magnetic field and electric field vibrating perpendicular to each other while propagation of the electromagnetic wave. Energy transfer takes place in from of electromagnetic wave.

Sound energy ; it is the energy produced by the vibration of sound waves. the energy transferred from one substance to another in form of sound wave.

Kinetic energy: Its an energy possessed by an object due its motion.

Movement of mass : It is an energy which leads to movement of the mass of an object.

Thermal work : It is an energy posses by the body due to movement of the particles.

3 0

3 years ago

Read 2 more answers

A 312 g sample of a metal is heated to 257.128 °C and plunged into 200 g of water at a temperature of 41.933 °C. The final tempe

DENIUS [597]

<h3>Answer:</h3>

0.362 J/g °C

<h3>Explanation:</h3>

We are given:

Mass of metal = 312 g

Initial temperature of the metal = 257.128 °C

Mass of water = 200 g

Initial temperature = 41.933 °C

Final temperature of water = 67.555 °C

Specific heat capacity of water = 4.184 J/g °C

We are required to calculate the specific heat capacity of the metal;

Step 1: Heat gained by water

Quantity of heat = mass × specific heat × change in temperature

Q=m × c × Δt

Change in temperature, Δt = 25.622 °C

Therefore,

Heat gained by water = 200 g × 4.184 J/g °C × 25.622 °C

= 21,440.49 Joules

<h3>Step 2: Heat released by the metal </h3>

Change in temperature of the metal, Δt =(257.128 °C-67.555 °C)

= 189.573 °C

Q = mcΔt

Assuming the specific heat capacity of the metal is c

Q= 312 g × 189.573 °C × c

= 59,146.776c Joules

<h3>Step 3: Calculate the specific heat capacity of the metal</h3>

The heat released by the metal is equivalent to heat gained by water.

Therefore;

59,146.776c J = 21,440.49 J

c = 21,440.49 J ÷ 59,146.776

= 0.362 J/g °C

Thus, the specific heat capacity of the metal is 0.362 J/g °C

3 0

3 years ago