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Svet_ta [14]
3 years ago
11

Jesse travels 3.0 meters east and then turns and travels 4.0 meters north. What distance did Jesse travel? 1 m 5 m, northeast 7

m 7 m, northeast

Chemistry
2 answers:
Nuetrik [128]3 years ago
4 0

Answer : The correct option is, 7 m

Explanation :

Distance : It is defined as the how much distance is covered by an object during the motion. It is a scalar quantity that means it does not depends on the direction.

Displacement : It is defined as the change in the position of an object. It is a vector quantity that means it has magnitude and as well as direction.

According to the question,

The distance traveled by jesse towards east = 3.0 m

The distance traveled by jesse towards north = 4.0 m

The total distance traveled by jesse = 3.0 m + 4.0 m = 7.0 m

Hence, the distance traveled by jesse is, 7 m

boyakko [2]3 years ago
3 0
7.0 meters because 3.0+4.0=7 
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Question 3) A 1.00 L buffer solution is 0.250 M in HF and 0.250 M in LiF. Calculate the pH of the solution after the addition of
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The pH of the solution after adding 0.150 moles of solid LiF is 3.84

<u>Explanation:</u>

We have the chemical equation,

HF (aq)+NaOH(aq)->NaF(aq)+H2O

To find how many moles have been used in this

c= n/V=> n= c.V

nHF=0.250 M⋅1.5 L=0.375 moles HF

Simillarly

nF=0.250 M⋅1.5 L=0.375 moles F

nHF=0.375 moles - 0.250 moles=0.125 moles

nF=0.375 moles+0.250 moles=0.625 moles

[HF]=0.125 moles/1.5 L=0.0834 M

[F−]=0.625 moles/1.5 L=0.4167 M

To determine the problem using the Henderson - Hasselbalch equation

pH=pKa+log ([conjugate base/[weak acid])

Find the value of Ka

pKa=−log(Ka)

pH=−log(Ka) +log([F−]/[HF]

pH= -log(3.5 x 10 ^4)+log(0.4167 M/0.0834 M)

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pH=3.84

The pH of the solution after adding 0.150 moles of solid LiF is 3.84

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