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3 years ago

A scientist adds iodine as an indicator to an unknown substance. What will this indicator reveal about the substance?

Chemistry

1 answer:

VLD [36.1K]3 years ago

7 0

Answer:

it will turn blue black to any substance

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What is work and why energy is useful for work???<br>(please guys give answer)

dexar [7]

Work is labor and energy is useful for it because you need energy to work unless you will be tired

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3 years ago

When determining the melting point of a substance, should one use a large or a small sample in the capillary? Should the sample

REY [17]

The glass capillary having one end closed and one open end is generally used for the determination of melting point of the sample. From the open end, the sample is put into the capillary, the sample must be firmly packed as the melting point is an intrinsic property that means it is independent of sample size. So, in order to determine the melting point of the sample small sample in the capillary is sufficient to measure the melting point of the sample. To obtain the more consistent value of melting point one must pack the sample firmly in the capillary.

Hence, when determining the melting point of a substance, one should use a small sample in the capillary and the sample should be firmly packed.

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3 years ago

How would you separate a mixture of alcohol and water

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3 years ago

Which of the following best describes the force that holds the nucleus and electrons of an atom together.

ANEK [815]

Answer: d Positive particles in the nucleus are attracted to shared electrons, so the atoms stay close together.

Explanation:

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3 years ago

What is the mole fraction of sodium chloride in solution that is 13. 0 y mass sodium chloride and that has a density of 1. 10 g/

lyudmila [28]

Mole fraction is the ratio of the constituent moles to the total constituents. The mole fraction of sodium chloride is 0.0443.

<h3>What is a mole fraction?</h3>

A mole fraction is the proportion of the moles of the component in a total component present.

In 100 gm of solution 13.0 5 means, there is 13.0 gm of sodium chloride present. The mass of water is calculated as,

100 - 13.0 = 87.0 gm

Moles of sodium chloride is calculated as:

$\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass} \\\\&= \dfrac{13}{58}\\\\&= 0.224 \;\rm moles\end{aligned}$

Moles of water are calculated as:

$\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass} \\\\&= \dfrac{87}{18}\\\\&= 4.83\;\rm moles\end{aligned}$

Now, moles fraction is calculated by dividing moles of sodium chloride by total moles as,

$\begin{aligned} \text{Mole fraction of NaCl} &= \dfrac{0.224}{0.224 + 4.83}\\\\&= 0.0443\end{aligned}$

Therefore, the mole fraction of sodium chloride is 0.0443.

Learn more about mole fraction here:

brainly.com/question/8076655

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2 years ago