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3 years ago

I have extra points so giving points out to people who can answer these questions

Chemistry

2 answers:

Klio2033 [76]3 years ago

7 0

Answer:

Dunkin' Donuts

Purple

Charli began dancing at age 3, and was a trained competitive dancer for over 10 years prior to starting TikTok.

Explanation:

slamgirl [31]3 years ago

3 0

Answer:

pink

Explanation:

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Following the instructions in your lab manual, you have titrated a 25.00 mL sample of 0.0100 M KIO3 with a solution of Na2S2O3 o

vivado [14]

Answer:

For 1: The amount of potassium iodate that were titrated is $2.5\times 10^{-4}$ moles

For 2: The amount of sodium thiosulfate required is $1.25\times 10^{-4}$ moles

Explanation:

For 1:

To calculate the number of moles for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in L)}}$

Molarity of $KIO_3$ solution = 0.0100 M

Volume of solution = 25 mL

Putting values in above equation, we get:

$0.0100M=\frac{\text{Moles of }KIO_3\times 1000}{25}\\\\\text{Moles of }KIO_3=\frac{0.0100\times 25}{1000}=0.00025mol$

Hence, the amount of potassium iodate that were titrated is $2.5\times 10^{-4}$ moles

For 2:

The chemical equation for the reaction of potassium iodate and sodium thiosulfate follows:

$2KIO_3+Na_2S_2O_3\rightarrow K_2S_2O_3+2NaIO_3$

By Stoichiometry of the reaction:

2 moles of potassium iodate reacts with 1 mole of sodium thiosulfate

So, 0.00025 moles of potassium iodate will react with = $\frac{1}{2}\times 0.00025=0.000125mol$ of sodium thiosulfate

Hence, the amount of sodium thiosulfate required is $1.25\times 10^{-4}$ moles

6 0

3 years ago

Please Help ASAP........................

Gennadij [26K]

C. Wavelength will increase

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3 years ago

if an object 18 millimeters high is placed 12 millimeters from a diverging lens and the image is formed 4 mm in front of the len

Natasha2012 [34]

I think the answer is 7mm but I'm not sure.

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3 years ago

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An element is a pure substance in which there are how many kinds of atoms?

Ostrovityanka [42]

Answer:

One

Explanation:

An element is a pure substance in which there are only one kind of atom. Elements are distinct substances that cannot be split up into simpler substances.

Such substances consists of only one kind of atom. There are over a hundred known elements to date.

Generally, as a pure substance, the composition of an element is definite and they are homogenous in all parts.

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3 years ago

Which part of dalton's theory did thomson's findings dispute? atoms of different elements have different masses. atoms of the sa

skad [1K]

Answer is: the atom is the smallest known particle of matter.
John Dalton claimed that atom is indestructible and all atoms of a given element are identical in mass and properties.
Thomson discovered electron and found the first evidence for isotopes of a stable element.

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3 years ago

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