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Elanso [62]
3 years ago
6

Sodium hydroxide is a substance that causes severe burns. It is used in many educational laboratory activities but, because of i

ts hazardous nature, care must be taken to ensure its safe use in the lab Select the following items that are true regarding the nature of sodium hydroxide, and the safety precautions that should be used when handling it in the laboratory. Select all that apply.
a. If sodium hydroxide is spilled on skin or clothing, the contaminated clothing should be removed immediately and the affected area should be drenched with plenty of water. Medical attention should be sought if a large area is affected, or if blistering occurs.
b. Sodium hydroxide solutions are particularly dangerous to the eyes
c. Sodium hydroxide solutions with high concentration can cause severe burns
d. If sodium hydroxide is introduced to the eyes, flush the affected eye continuously with water for at least 15 minutes. Get medical attention immediately.
e. Eye protection should be worn at all times when handling any form of sodium hydroxide
Chemistry
1 answer:
Pepsi [2]3 years ago
5 0

Answer:

All the alternatives are TRUE

a. If sodium hydroxide is spilled on skin or clothing, the contaminated clothing should be removed immediately and the affected area should be drenched with plenty of water. Medical attention should be sought if a large area is affected, or if blistering occurs.

b. Sodium hydroxide solutions are particularly dangerous to the eyes

c. Sodium hydroxide solutions with high concentration can cause severe burns

d. If sodium hydroxide is introduced to the eyes, flush the affected eye continuously with water for at least 15 minutes. Get medical attention immediately.

e. Eye protection should be worn at all times when handling any form of sodium hydroxide

Explanation:

Sodium hydroxide (NaOH) is used in industry (mainly as a chemical base) in the manufacture of paper, fabrics, detergents, food and biodiesel. Also used to clear pipes and sinks because it is corrosive. It is produced by electrolysis of an aqueous solution of sodium chloride (brine).

The handling of sodium hydroxide must be done with total care, as it presents many health risks. If ingested, it can cause serious and sometimes irreversible damage to the gastrointestinal system, and if inhaled it can cause irritation, and in high doses it can lead to death. Contact with the skin is also a dangerous fact, as it can cause a simple irritation to a severe ulcer, and in the eyes it can cause burns and corneal or conjunctive problems. In cases of contact with sodium hydroxide, the exposed region should be placed in running water for 15 min and seek medical help. If swallowed, the victim should be given water or milk without causing vomiting, if inhaled, take the victim to an open place so he can breathe. If the victim is not breathing, artificial respiration is required.

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Calculate the no. of each atoms presents in 10 grams of calcium carbonate.
raketka [301]

Molar Mass of Calcium carbonate:-

\\ \sf\longmapsto CaCO_3

\\ \sf\longmapsto 40u+12u+3(16u)

\\ \sf\longmapsto 52u+48u

\\ \sf\longmapsto 100u

\\ \sf\longmapsto 100g/mol

  • Given Mass=10g

\boxed{\sf No\:of\;moles=\dfrac{Given\:Mass}{Molar\:Mass}}

\\ \sf\longmapsto No\:of\;moles=\dfrac{10}{100}

\\ \sf\longmapsto No\:of\:moles=0.1mol

Now

\boxed{\sf No\:of\:molecules=No\;of\:moles\times Avagadro\: No}

\\ \sf\longmapsto 0.1\times 6.023\times 10^{23}

\\ \sf\longmapsto 6.023\times 10^{22}molecules

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Answer:

E

C

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A

Explanation:

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Utiliando las leyes de Newton encontraremos que la aceleración de Ana es -1.6 m/s^2.

La segunda ley de Newton dice que:

F = m*a

Fuerza es igual a masa por aceleración.

La tercera ley de Newton dice que cuando dos objetos interactuan, cadan objeto ejerce una fuerza de <u>igual magnitud pero opuesta direccion</u> en el otro.

Ahora veamos como aplicar esto.

Sabemos que la niña empuja al niño, asumamos que con una fuerza F.

Tendremos entonces la ecuación:

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Sí quieres aprender más, puedes leer:

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