How would I separate uncooked rice from salt rocks?

1 answer:

4 0

Mixing the 3 with water would dissolve the salt. Filtration would then yield salt water and a rice/pepper mix on the filter. Evaporation of the salt water would afford dry salt. THe other two are harder being organics - trial and error might lead you to a solvent that would dissolve pepper, but not rice or vice-versa. Filtration and evaporation could be used again, but I have no idea about which solvent to use.

To use chromatography you would need a solvent for all three or a sequence of solvents to sequentially dissolve each component.

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What is the density of salt water?

mel-nik [20]

The density of salt water is 1.025 kg/liters .

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Along with removing drugs from the body, the kidneys also __________. A. balance pH levels B. release hormones that regulate blo

swat32

I think the answer must be B, although A is technically somewhat true too. Though the liver can regulate acid secretion, thus helping to balance the pH of blood by increasing or decreasing the acid secretion (can rid the body of excess acid through urine), the question doesn't specify that it balances the pH levels of BLOOD, and equally, multiple factors in the body have a role in balancing bodily pH levels, thus it is not the primary function of the liver. Thus, it must be B. The cells in the liver release an enzyme called renin, which activates angiotensin, which in turn activates the hormone aldostrene, which controls salt retention and elimination of potassium in the kidneys, thus affecting blood pressure and fluid balance.

Hope I helped! x

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kumpel [21]

<span>A total mechanical energy of an object is calculated as the sum of kinetic energy and potential energy</span>

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A gas occupies 100.0 mL at a pressure of 780 mm ahh. What is the volume of the gas when it’s pressure is increased to 880 mm Hg

vlabodo [156]

Hello!

The volume of the gas when its pressure is increased to 880 mm Hg is 88,64 mL

This question can be easily answered using the Boyle's Law, which states that as pressure increases, the volume is lower. It can be expressed in a mathematical way as follows:

$P_1*V_1=P_2*V_2$

So, from this equation we can clear V₂ to find the volume at 880 mm Hg:

$V_2= \frac{P_1*V_1}{P_2}= \frac{780 mmHg*100 mL}{880 mmHg}=88,64 mL$

Have a nice day!

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4 years ago

What happened to Mendeleev's mother after he was accepted into St. Petersburg University?

Rama09 [41]

Answer:

his mother died i think

Explanation:

Although he was not accepted, his mother was determined to give her son a first-class education and they walked to St. Petersburg. Dmitri was accepted into the Institute of Pedagogy on a full scholarship. That same year his mother died and at the age of sixteen, Dmitri was orphaned.

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