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kvv77 [185]
3 years ago
10

Snape and Dumbledore both agree that safety must be a priority. Before we get into the more challenging questions they think we

should review some safety practices. For the reactivity of metals experiment which of the following is a laboratory safety precaution? Please read all the choices before choosing an answer.A) Since you will be working with hydrochloric acid (6M) care must be exercised not to get this acid on your clothes or skin. If you should come into physical contact with it, wash if off as fast as possible with copious amounts of water. Then inform your teaching assistant of your spill.B) You must wear goggles in this laboratory.C) Handle your thermometer with care. When you remove it from your drawer be sure to hold both ends of the thermometer so that it does not slip out.D) No flames of any type will be permitted in the laboratory while this experiment is being performed.
Chemistry
1 answer:
alukav5142 [94]3 years ago
4 0

Answer:

The correct answer is option C) "Handle your thermometer with care. When you remove it from your drawer be sure to hold both ends of the thermometer so that it does not slip out".

Explanation:

Handling a thermometer with care is part of the laboratory safety precautions that should be considered regarding to the reactivity of metals. Old thermometers are based on the element mercury, a shining metal that is the only element that is in liquid state on room temperature conditions. Mercury is very toxic, and is particularly dangerous because it vaporizes at room temperature and it could be inhaled.

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Describe one example of an energy transformation in this diagram and explain why it is a transformation. Repeat this description
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Explanation:

here u go :P

8 0
3 years ago
Read 2 more answers
Please help make sure its correct thanks
Wewaii [24]

The empirical formula of metal iodide : CoI₃(Cobalt(III) Iodide)

<h3>Further explanation</h3>

13.02 g sample of Cobalt , then mol Co(MW=58.933 g/mol) :

\tt mol=\dfrac{mass}{Ar}=\\\\mol=\dfrac{13.02~g}{58.933}\\\\mol=0.221

Mass of metal iodide formed : 97.12 g, so mass of Iodine :

\tt =mass~metal~iodide-mass~Cobalt\\\\=97.12-13.02\\\\=84.1~g

Then mol iodine (MW=126.9045 g/mol) :

\tt \dfrac{84.1}{126.9045}=0.663

mol ratio of Cobalt and Iodine in the compound :

\tt 0.221\div 0.663=1\div 3

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The SA node, the cardiac center in the medulla oblongata, and the endocrine system
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