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3 years ago

hi, can you check if my answers are correct? I'm not so confident in this topic (topic: Classifying Types of Chemical Reactions)

Chemistry

1 answer:

NikAS [45]3 years ago

7 0

I am pretty sure your answer are correct , from what I know. Good job!

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The many electron diamonds around the central carbon are 1689

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3 years ago

What is another name for the acid dissociation constant?

sveticcg [70]

A. Ionization constant

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3 years ago

Read 2 more answers

What is the ph of a solution with [h+] = 2.3 10-9?

oksano4ka [1.4K]

$pH = -log[H+] = -log[2.3*10^-9] = 8.64$

8 0

3 years ago

2- A sheet of steel 3.0-mm thick has nitrogen atmospheres on both sides at 900Â°C and is permitted to achieve a steady-state dif

Bezzdna [24]

Answer:

2.78x10⁻³ m

Explanation:

Nitrogen diffusion in the steel can be expressed using the following equation:

$J = - D*\frac{\Delta C}{\Delta x} = - D*\frac{C_{1} - C_{2}}{x_{1} - x_{2}}$

Where:

J: is the diffusion flux = 1.0x10⁻⁷ kgm⁻²s⁻¹

D: is the diffusion coefficient = 1.85x10⁻¹⁰ m²/s

C₁: is the concentration of nitrogen in the steel at the surface = 2 kg/m³

C₂: is the concentration of nitrogen at the distance x₂ = 0.5 kg/m³

x₁: is the distance at the surface = 0

x₂: is the distance to find

Hence, we have:

$J = - D*\frac{C_{1} - C_{2}}{- x_{2}}$ (1)

Solving equation (1) for x₂:

$x_{2} = D \frac{C_{1} - C_{2}}{J} = 1.85 \cdot 10^{-10} m^{2}/s \frac{2 kg/m^{3} - 0.5 kg/m^{3}}{1.0 \cdot 10^{-7} kgm^{-2}s^{-1}} = 2.78 \cdot 10^{-3} m$

Therefore, the nitrogen will enter 2.78x10⁻³ m into the sheet.

I hope it helps you!

7 0

3 years ago

In the reaction 2 c o2 → 2 co, how many moles of carbon are needed to produce 66.0 g of carbon monoxide

weeeeeb [17]

The solution would be like this for this specific problem:

Given:

66.0 g of carbon monoxide

reaction 2 C + O2 → 2 CO

mol e= mass / molar mass 
mole of 2CO = 66.0g / (12.011 15.999)g / mol 
mole of 2CO = 2.36 (CO and C has a 1:1 mole ratio)

mole of 2CO = 2.36 -> mole of 1 CO = 2.36 / 2 = 1.18

We got 2 moles of C, thus 1.18 x 2 = 2.36

So, we 2.36 moles of carbon are needed to produce 66.0 g of carbon monoxide in the reaction 2 C + O2 → 2 CO. To add, Carbon nonmetallic and tetravalent, thus, making four electrons available to form covalent chemical bonds.

6 0

3 years ago