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Alexus [3.1K]
2 years ago
5

Help me plsnayone here50 pointsfreee ​

Chemistry
2 answers:
tatyana61 [14]2 years ago
8 0

Answer:

what is the question? Because all i see is that theirs answer choices so i guess the answer is A

Explanation:

scoray [572]2 years ago
3 0

8).

(a) Acid Rain is formed due to precipitation of acids (oxides of nitrogen and sulfur dioxide) mixing with the oxygen and water in the clouds. Then they pour on the ground with the rain water leading huge problems like damaging habitat for animals and etc.

(b) Acid rain is formed due to Sulphur dioxide formed by combustion of fuels and nitrogen oxides from hot engines, they dissolve and cause acid rain.

Equation's:

formation of Sulphur dioxide : S + O₂ = SO₂

formation of sulfuric acid : SO₂ + ½O₂ + H₂O = H₂SO₄

(c) Some harmful effects of acid rain are:

   i) Damages tree and plants.

   ii) Kills fish and animals in river.

   iii) Damages buildings and structures.

Additional: Acid rain can be prevented by addition of catalytic converters in car and using slaked lime in factories to neutralize the acidic oxides.

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A hot lump of 39.9 g of iron at an initial temperature of 78.1 °C is placed in 50.0 mL H 2 O initially at 25.0 °C and allowed to
Drupady [299]

Answer : The final temperature of the mixture is 29.6^oC

Explanation :

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

q_1=-q_2

m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)

where,

c_1 = specific heat of iron = 0.499J/g^oC

c_2 = specific heat of water = 4.18J/g^oC

m_1 = mass of iron = 39.9 g

m_2 = mass of water  = Density\times Volume=1g/mL\times 50.0mL=50.0g

T_f = final temperature of mixture = ?

T_1 = initial temperature of iron = 78.1^oC

T_2 = initial temperature of water = 25.0^oC

Now put all the given values in the above formula, we get

(39.9g)\times (0.499J/g^oC)\times (T_f-78.1)^oC=-(50.0g)\times 4.18J/g^oC\times (T_f-25.0)^oC

T_f=29.6^oC

Therefore, the final temperature of the mixture is 29.6^oC

8 0
3 years ago
match these items. three-dimensional bonding, hardest natural substance, used as lubricant, nonconductor, weak planar bonds, car
DENIUS [597]

Answer:

1. three-dimensional bonding

Diamond

2. Hardest natural substance

diamond

3. Used as lubricant

Graphite

4. nonconductor

Diamond

5. Weak, planar bonds

Graphite

6.Carbon black or soot

Amorphous

Explanation;

sorry im late, hopefully this can help somebody :)

4 0
2 years ago
Ultraviolet radiation has a frequency of 6.8×1015 Hz. What is the energy associated with this frequency?
stellarik [79]

Use Planck's equation (E=hv) to solve.  where <span>frequency (v) of ultrviolet radiation is 6.8 × 1015 1/s.  </span><span> </span>The variable h is a constant equal to 6.63 × 10-34 J·s
E= <span>(6.8 × 1015 1/s)x(</span>6.63 × 10-34 J·s)


5 0
3 years ago
Why does hydrogen peroxide turn your skin white
Julli [10]

Answer:

Hydrogen Peroxide is known as a dental “debriding agent”. But when used on skin for minor wounds it will foam and turn surrounding tissue white. ... H2O2 decomposes easily to make water (H2O) and a single free oxygen atom which is looking for something to react with - like your skin.

Explanation:

4 0
3 years ago
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What is a chemical property of plastic
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Chemical property of plastic are compounds composed of carbon , hydrogen .
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