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3 years ago

Which milligram quantity contains a total of four significant figures

Chemistry

2 answers:

denis23 [38]3 years ago

7 0

D has a total of four significant figures.

Ksenya-84 [330]3 years ago

3 0

Answer:

Explanation:

The first 0 is sandwiched between the 3&1 and a ending 0 that is after the decimal is significant.

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Which will diffuse the most? The particles with the

spayn [35]

Answer:

B. Most potential energy

Explanation:

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3 0

3 years ago

Calculate the final pH of a solution made by the addition of 10 mL of a 0.5 M NaOH solution to 500 mL of a 0.4 M HA originally a

Allushta [10]

This question is not complete, the complete question is;

Calculate the final pH of a solution made by the addition of 10 mL of a 0.5 M NaOH solution to 500 mL of a 0.4 M HA originally at pH = 5.0 ( pKa = 5.0)

Neglect the volume change.

Options:

a) 6.10

b) 5.09

c) 7.00

d) 5.02

Answer:

the final pH of a solution is 5.02

Option d) 5.02 is the Correct Answer

Explanation:

Given the data in the question,

Initially pKa = pH; so ratio is 1:1

thus, 0.4 M acid and base

Now, moles of NaOH = molarity × volume = 0.5 × 10 = 5 mmol = 5 × 10⁻³ mol.

Going into 500 mL ( 0.5 L ) of solution

new molarity will be;

⇒ moles / volume = 5 × 10⁻³ / 0.5 = 0.01 M

ACID reacting with BASE

original concentration of acid = 0.4 - 0.01 = 0.39 M

original concentration of base = 0.4 + 0.01 = 0.41 M

pH = 5 + log( base/acid)

= 5 + log ( 0.41/0.39)

= 5 + log ( 1.0512)

= 5 + 0.021

pH = 5.02

Therefore the final pH of a solution is 5.02

Option d) 5.02 is the Correct Answer

5 0

3 years ago

When you walk, you push against the floor, and _________.

Taya2010 [7]

When you walk, you push against the floor, and the floor pushes back against you.

Answer: B. The floor pushes back agaisnt you.

Good luck with your studies, I hope this helps~!

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3 years ago

Unscramble the following words to form a complete sentence about the cycles of nature:

Luden [163]

Answer: idk I have that question too , sorry to get ur hopes up high thinking this was an answer. PERIOTTTT

Explanation:

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3 years ago

Calculate the pH at of a 0.10 Msolution of anilinium chloride . Note that aniline is a weak base with a of . Round your answer t

notsponge [240]

The question is incomplete, here is the complete question:

Calculate the pH at of a 0.10 M solution of anilinium chloride $(C_6H_5NH_3Cl)$ . Note that aniline $(C6H5NH2)$ is a weak base with a $pK_b$ of 4.87. Round your answer to 1 decimal place.