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-BARSIC- [3]
3 years ago
13

1. Describe potential long-term and short-term effects of exposure to chemicals.

Chemistry
1 answer:
attashe74 [19]3 years ago
5 0

Answer:

The answer to the question is explained below

Explanation:

A chemical is any substance or an element that can occur naturally or can be created artificially. Chemicals are found in many places like the soil, water, air. They can be found solely as an element without being combined with other elements, and they can also be found as a mixture in compounds.

Exposure to chemicals can be made possible through direct contact with the eye, broken skin. It can also be possible through Inhalation of gases, also through the mouth.

Long-term effects occur when an individual has been exposed to harmful chemicals over a long period of time, with the effect often fatal. Long-term exposure to chemicals include:

1. The weakening of the immune system

2. can cause cancer. For example, Carcinogens that cause cancer in humans, are gotten from exposures to Carbon Tetrachloride, Chloroform.

3. It can cause brain damage

4. It can lead to reproductive disorders

5. It can lead to eye damage, skin problems, and respiratory problems

Short-term effects occur when an individual has been exposed to harmful chemicals accidentally, or within a short period of time. As such, depending on the type of chemical, the amount the individual is exposed to, the effect is usually less fatal and can be addressed. Short-term exposure to chemicals include:

1. Skin or eye irritation

2. Headache

3. Nausea

4. Cough

5. Dizziness

6. Physical injuries

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A particular flask has a mass of 17.4916 g when empty. When filled with ordinary water at 20.0°c (density = 0.9982 g/ml), the ma
LUCKY_DIMON [66]

The mass of the empty flask is 17.4916 g. Now after feeling the ordinary water the mass of the flask is 43.9616 g. Thus the change of weight due to addition of ordinary water is (43.9616 - 17.4916) = 26.47 g.

Now as the density of the ordinary water at 20°C is 0.9982 g/ml, so 26.47 g is equivalent to \frac{26.47}{0.9982}=26.5177 mL of water. Thus the capacity of the flask is 26.5177 mL.

Now the density of heavy water is 1.1053 g/mL at 20°C. Thus 26.5177 mL of heavy water is equivalent to (1.1053×26.5177) = 29.310 g.

Thus the total weight of the flask filled with heavy water will be (17.4916 + 29.310) = 46.8016 g at 20°C.  

4 0
3 years ago
Read 2 more answers
The temp of a star is 6000k and it’s luminosity is 1000k. What kind of star is it? A) white dwarf B) main sequence star C) giant
coldgirl [10]
Hi,


The answer is none of them.
A star with 6000k of surface temperature can only be yellow dwarf.

Hope this helps.
r3t40
4 0
3 years ago
Read 2 more answers
A chemist measures the energy change Delta H during the following
solong [7]

Answer: 1) Endothermic

2) Yes, absorbed.

3) 166.86 kJ will be absorbed.

Explanation:

1) To determine if a reaction is endothermic (heat is absorbed by the system) or exothermic (heat is released by the system), first calculate its change in Enthalpy, which is given by:

ΔH = H_{products} - H_{reagents}

For the reaction 2Fe₂O₃(s) ⇒ 4FeO(s) + O₂(g):

<u />

<u>Enthalpy of Reagent (</u>Fe₂O₃(s)<u>)</u>

Enthalpy of formation for Fe₂O₃(s) is - 822.2 kJ/mol

The reaction needs 2 mols of the molecule, so:

H = 2(-822.2)

H = - 1644.4

<u />

<u>Enthalpy of Products (</u>4FeO(s) + O₂(g<u>))</u>

Enthalpy of formation of O₂ is 0, because it is in its standard state.

Enthalpy of formation of FeO is - 272.04 kJ/mol

The reaction produces 4 mols of iron oxide, so:

H = 4(-272.04)

H = -1088.16

<u>Change in Enthalpy</u>:

ΔH = H_{products} - H_{reagents}

ΔH = - 1088.16 - (-1644.4)

ΔH = + 556.2 kJ/mol

The change in enthalpy is positive, which means that the reaction is absorving heat. Then, the chemical reaction is Endothermic.

2) When Fe₂O₃(s) reacts, heat is absorbed because it is an endothermic reaction.

3) Calculate how many mols there is in 94.2 g of Fe₂O₃(s):

n = \frac{mass}{molar mass}

n = \frac{94.2}{160}

n = 0.6 mols

In the reaction, for 2 mols of Fe₂O₃(s), 556.2 kJ are absorbed. Then:

2 mols --------------- 556.2 kJ

0.6 mols ------------- x

x = \frac{0.6*556.2}{2}

x = 167 kJ

It will be absorbed 167 kJ of energy, when 94.2 g of Fe₂O₃(s) reacts.

4 0
3 years ago
What type of matter is in this
malfutka [58]
Pretty sure it’s Plasma
5 0
3 years ago
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What is an isotope and what is atomic structure?
Anarel [89]

Answer:

Isotopes are atoms with the same number of protons, but different numbers of neutrons.

Explanation:

Ex.

Ne 20/10

Ne 21/10

Ne 22/10

*the number of protons in an atom must stay the same or the element itself will change drastically

8 0
3 years ago
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