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3 years ago

A student is heating a chemical in a beaker with a Bunsen burner.

2 answers:

7 0

The student should wear a lab coat that will protect the body from potential spilling of the substance, protective eyewear in case the compound will explode and latex gloves to have some protection against the chemicals which may burn the skin. Besides the respiratory mask, the heating should be carried out in a laboratory hood to prevent the inhalation of the toxic compound which may be released if the chemical will burn. After the heating is complete the beaker should be handled with wooden pliers because is very hot and so avoiding thermal burning.

Explanation:

gogolik [260]3 years ago

3 0

Explanation:

A lab coat protects the student from any spillage of the chemicals on his body. Gloves should protect the student from getting the chemical on his hands as he works. Safety goggles also protect the eyes from any splatter than may be directed towards the eyes.

If the heating produces fumes he must heat the chemical near a window and with the mouth of the beaker facing away from him/her. A safety cabinet should be used if the fumes are considered harmful to inhale.

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Molarity = 3.9 * 10 ^ -8

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pH = - (-7.40893539)

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______ reactions release energy.

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Combustion reactions release energy in the form of heat.
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If 185 mg of acetaminophen were obtained from a tablet containing 350 mg of acetamino- phen, what would be the weight percentage

Alex73 [517]

Percentage recovery gives us an idea of the amount of pure substance recovered after the chemical reaction. Percentage recovery can be more than 100 % or less than 100 %. Usually, in any experiment performed the weight percentage recovery will be less than 100. Percent recovery values greater than 100 show that the recovered compound is contaminated.

Amount of acetaminophen initially taken = 350 mg

Amount of acetaminophen obtained after recovery =185 mg

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= $\frac{185 mg}{350 mg}*100$

= 52.9%

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3 years ago

Ethan pushes a wooden box across a carpeted floor. Then he pushes the same box across a smooth marble floor. Why does Ethan find

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Because there is less friction on the marble floor.

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2 years ago

Calculate how many grams of the first reactant are necessary to completely react with 17.3 g of the second reactant. the reactio

soldier1979 [14.2K]

Taking into account the reaction stoichiometry, 16.611 grams of Na₂CO₃ are necessary to completely react with 17.3 g of CuCl₂.

<h3>Reaction stoichiometry</h3>

In first place, the balanced reaction is:

Na₂CO₃ + CuCl₂ → CuCO₃ + 2 NaCl

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Na₂CO₃: 1 mole
CuCl₂: 1 mole
CuCO₃: 1 mole
NaCl: 2 moles

The molar mass of the compounds is:

Na₂CO₃: 129 g/mole
CuCl₂: 134.45 g/mole
CuCO₃: 123.55 g/mole
NaCl: 58.45 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Na₂CO₃: 1 mole ×129 g/mole= 129 grams
CuCl₂: 1 mole ×134.45 g/mole= 134.45 grams
CuCO₃: 1 mole ×123.55 g/mole= 123.55 grams
NaCl: 2 mole ×58.45 g/mole=116.9 grams

<h3>Mass of CuCl₂ required</h3>

The following rule of three can be applied: If by reaction stoichiometry 134.35 grams of CuCl₂ react with 129 grams of Na₂CO₃, 17.3 grams of CuCl₂ react with how much mass of Na₂CO₃?

mass of Na₂CO₃= (17.3 grams of CuCl₂× 129 grams of Na₂CO₃)÷ 134.35 grams of CuCl₂

<u><em>mass of Na₂CO₃= 16.611 grams</em></u>

Finally, 16.611 grams of Na₂CO₃ is required.

Learn more about the reaction stoichiometry:

brainly.com/question/24741074

brainly.com/question/24653699

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6 0

1 year ago