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3 years ago

Lavoviser is commonly know as the( brainly dont eveer help)

2 answers:

6 0

Lavoisier is known as the “Father of Modern Chemistry” or the “Father of Chemistry”.

He is famous for isolating oxygen and establishing the law of conservation of mass.

Elodia [21]3 years ago

3 0

Answer:Lavoisier is known as the “Father of Modern Chemistry” or the “Father of Chemistry”.

Explanation:

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What continent has no deserts

nevsk [136]

Answer:

Antarctica.

Explanation:

It’s all ice.

4 0

3 years ago

Which information in the periodic table indicates the number of protons in an atom? A. the position of the element in its c

Leni [432]

Hi there!

D is true

the number of protons is same as atomic number in an atom

good luck!

3 0

3 years ago

Read 2 more answers

er solutions can be produced by mixing a weak acid with its conjugate base or by mixing a weak base with its conjugate acid. The

liubo4ka [24]

Answer:

You need to add 19,5 mmol of acetates

Explanation:

Using the Henderson-Hasselbalch equation:

pH = pKa + log₁₀ [base]/[acid]

For the buffer of acetates:

pH = pKa + log₁₀ [CH₃COO⁻]/[CH₃COOH]

As pH you want is 5,03, pka is 4,74 and milimoles of acetic acid are 10:

5,03 = 4,74 + log₁₀ [CH₃COO⁻]/[10]

1,95 = [CH₃COO⁻]/[10]

<em>[CH₃COO⁻] = 19,5 milimoles</em>

Thus, to produce an acetate buffer of 5,03 having 10 mmol of acetic acid, you need to add 19,5 mmol of acetates.

I hope it helps!

7 0

4 years ago

At 298 K, the rate constant for a reaction is 0.0346 s-1. What is the rate constant at 350K if the Ea = 50.2kJ/mol

frutty [35]

Answer:

0.702 /s

Explanation:

Rate constant at $[298 \mathrm{~K}, \mathrm{~K}_{1}=3.46 \times 10^{-2} \mathrm{~s}^{-1}$

Rate constant at $350 \mathrm{~K}, \mathrm{~K}_{2}=?$

$T_{1}=298 \mathrm{~K}$

$T_{2}=350 \mathrm{~K}$

Activation energy, $\mathrm{Ea}=50.2 \times 10^{3} \mathrm{~J} / \mathrm{mol}$

Use the following equation to calculate $K_{2}$ at $350 \mathrm{~K}$

$\ln \frac{\mathrm{K}_{2}}{\mathrm{~K}_{1}}=\frac{\mathrm{Ea}}{\mathrm{R}}\left[\frac{1}{\mathrm{~T}_{1}}-\frac{1}{\mathrm{~T}_{2}}\right]$

Therefore,

$\ln \left(\frac{K_{2}}{3.46 \times 10^{-2} \mathrm{~s}^{-1}}\right) &=\frac{50.2 \times 10^{3} \mathrm{~J} / \mathrm{mol}}{8.314 \mathrm{JK}^{-1} \mathrm{~mole}^{-1}}\left[\frac{1}{298 \mathrm{~K}}-\frac{1}{350 \mathrm{~K}}\right]$

$\ln \left(\frac{K_{2}}{3.46 \times 10^{-2} \mathrm{~s}^{-1}}\right) &=\frac{50.2 \times 10^{3} \mathrm{~J} / \mathrm{mol}}{8.314 \mathrm{JK}^{-1} \mathrm{~mole}^{-1}}\left[\frac{52 \mathrm{~K}}{298 \mathrm{~K} \times 350 \mathrm{~K}}\right]$

$\frac{K_{2}}{3.46 \times 10^{-2} \mathrm{~s}^{-1}} &=\mathrm{e}^{3.01}$

$\frac{K_{2}}{3.46 \times 10^{-2} \mathrm{~s}^{-1}} &=20.3$

$K_{2} &=20.3 \times 3.46 \times 10^{-2} \mathrm{~s}^{-1}$

$&=0.702 \mathrm{~s}^{-1}$

hence, the rate constant at $350 \mathrm{~K}$ is 0.702 $\mathrm{~s}^{-1}$

5 0

3 years ago

4. Which of the following organic molecules are isomers?

KengaRu [80]

The following organic molecules are isomers CH3CH₂CH₂CH3. <u>Option A</u>.

All organic compounds have isomers. Isomers mean that they have the same molecular formula but different configurations. The connectivity of a connection ultimately determines its functionality. For example, the same molecular formula can be used to identify alcohols or ethers.

Isomers are molecules that have the same molecular formula but differ in the arrangement of their atoms in space. This excludes all other configurations by rotating the molecule as a whole or around specific bonds. In organic chemistry, isomers are molecules that have the same molecular formula but differ in the structural or spatial arrangement of the atoms within the molecule.

Learn more about Organic molecules here:-brainly.com/question/26556885

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5 0

1 year ago