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2 years ago

Evaluate the method of separation to be used.1. Stones and rice (for cooking)

Chemistry

2 answers:

zheka24 [161]2 years ago

8 0

Answer:

hand picking

Explanation:

as stone is bigger in size we can see them with our eyes so we can handpick it

Ira Lisetskai [31]2 years ago

3 0

Answer:

The method of hand picking is used to separate undesirable substances such as small pieces of stones from wheat, rice and pulses. The food grains containing small pieces of stones are taken in a flat container. The pieces of stones are picked up from the grains by hands, one by one, and thrown away.23 Oct 2020

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BRAINLIESTTT ASAP!! PLEASE HELP ME :)

Ratling [72]

Jot down the formula of the ionic compound. Let's say the ionic compound you're working with is NaCl.

Write the name of the metal.

Add the name of the non-metal with an –ide ending.

Combine the cation and anion names.

Practice naming more simple ionic compounds.

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3 years ago

After distilling your crude methyl benzoate, you set aside 4.83 grams of the purified ester. You then prepare the grignard reage

Ber [7]

Answer:

95.6 %

Explanation:

For this question, we will have 2 reactions, the formation of the grignard reagent and the formation of the alcohol. The first step then is the calculation of the maximum amount of the grignard reagent. For this, we have to convert the grams to moles and check the smallest value. To do this we have to take into account the following conversion ratios:

Molar mass of Mg = 24 g/mol

Molar mass of phenylmagnesium bromide ( $C_6H_5Br$ )= 157 g/mol

Density of bromobenzene= 1.5 g/mL

Molar ratio between Mg and $C_6H_5Br$ = 1:1

$2.3~g~Mg\frac{1~mol~Mg}{24~g~Mg}=0.096~mol~Mg$

$9.45~mL~\frac{1g}{1.5mL}\frac{1~mol~C_6H_5Br}{157~g}=0.0402~mol~C_6H_5Br$

The smallest value is the mol of bromobenzene therefore 0.0402 mol of phenylmagnesium bromide would be produced.

The next step is repite the same steps for the reaction of formation of the alcohol. Therefore we have to find the moles of methyl benzoate, so:

Molar mass of methyl benzoate: 136.14 g/mol

$4.83~g~\frac{1~mol}{136.14~g}=0.35~mol$

The we have to divide by the coefficient of each reactive in the balance reaction. So:

$\frac{0.35~mol}{1}=0.35$

$\frac{0.0402~mol}{2}=0.0201$

Therefore the limiting reagent would be the phenylmagnesium bromide. Now, the molar ratio between the phenylmagnesium bromide and triphenyl carbinol is 2:1, so the amount of alcohol produced is 0.0201 mol triphenyl carbinol. The next step is the conversion from mol to grams of triphenyl carbinol:

Molar mass of triphenyl carbinol= 260.33 g/mol

$0.0201~mol\frac{260.33~g}{1~mol}=5.23~g~triphenyl carbinol$

Finally, we have to divide the obtanied solid by the calculated one:

$Percentage=\frac{5}{5.23}*100=95.6\%$

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3 years ago

Each particular chemical reaction cannot be expected to occur at identical rates.

givi [52]

Each particular chemical reaction cannot be expected to occur at identical rates.

True. Not all chemical reactions happen at the same rate, depending on the catalyst.

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3 years ago

How many molecules are present in 2 H₂ SO4

fomenos

Answer:

in H2So4 splits in 2 H+ and a

so42 -particle=3particle per mole.So2

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2 years ago

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Which element can join with other elements to form covalent bonds? beryllium (Be) carbon (C) cesium (Cs) iron (Fe)

Rainbow [258]

Answer:

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3 years ago

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Evaluate the method of separation to be used.1. Stones and rice (for cooking)​

Evaluate the method of separation to be used.1. Stones and rice (for cooking)