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faust18 [17]
3 years ago
14

ITS MY WORK FROM SCIENCE, AND I NEED THAT FOR NOW, I DONT EVEN KNOW HOW TO ANSWER THAT​

Chemistry
1 answer:
m_a_m_a [10]3 years ago
5 0

Answer:

TEEHEE

Explanation:

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A chemistry student must write down in her lab notebook the concentration of a solution of potassium chloride. The concentration
almond37 [142]

Answer:

d = 3.65 g/mL

Explanation:

This problem is solved by using the equation:

d= m/V

But we have to be careful with the number of significant figures and number of decimals to report our result.

There are two steps to calculate the density:

1. We should perform a substraction to determine the mass of potassium chloride.

mass KCl =( Weight cylinder + KCl ) - (Weight empty cylinder)

92.7 g - 5.55 g = 87.15 g = 87.2 ( rounded to 1 decimal place)

The rule for addition and substraction is that we round the result  to the number of decimal place  with the least  number of decimals ( 92.7 has one decimal, 5.55 has two)

2. We can now calculate the density by dividing the mass into the volume, but retaining the number of significant figures to the number with the smallest number of significant figures, the rule for multiplication and division.

d= m/V = 87.2 g / 23.9 mL = 3.648 g/mL

87.2 has three significant figures and so does 23.9, so we have to round to 3 significant figures.

The rule here is that if the left most digital to be dropped is greater o equal to 5, we round to the nearest higher digit, so 8 is greater than 5 and we rounded up 3.648 to 3.65.

4 0
4 years ago
Second time posting this, help asap, please :( Will give a brainliest!
nlexa [21]

Answer:

Reduction half

Fe2+ +2e -------> Fe

Oxidation half

Mn-----> Mn4+. +4e

Explanation:

Oxidation is loss of electron and reduction is gain of electron

6 0
3 years ago
Why are models used to represent Atoms
Keith_Richards [23]

Answer:

C

Explanation:

5 0
3 years ago
Read 2 more answers
What is the molar mass of Iron (ll) Hydroxide, Fe(OH)2.
Tanzania [10]

FeOH2 = 73.8602753 g/mol

FOLLOW ME FOR CLEARING YOUR NEXT DOUBT

4 0
3 years ago
Taku mixed some water and juice crystals to make a fruit drink.
aliya0001 [1]
This is not a math question but I’ll help. The solute is what you are dissolving something in. The solvent is what is dissolved. So if you are dissolving juice crystals IN water the juice crystals would be the solvent and the water would be the solute
5 0
3 years ago
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