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atroni [7]
3 years ago
13

Question 4 of 10

Chemistry
1 answer:
Fiesta28 [93]3 years ago
7 0

Answer:

B is the answer

Explanation:

B is the most un reasonable answer to do at the BEGINNING of the process. All of the other answers are things you do at the beginning or, before you start it. "Decide whether they have designed the best possible product" means you FINISHED it already, and we want what the engineers needs to do at the beginning. Common sense actually. Your welcome.

<em>A friendly dude that likes to help</em>

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Scientists learn about the universe by studying the light that comes to Earth from stars and other objects in space. If you were
AfilCa [17]

there's really no specific answer but mine would be...

1. how does that light show from earth?

2. will that light ever dim?

3. are some stars bright but just not bright enough that we can see?

7 0
3 years ago
Read 2 more answers
A wind turbine generating electricity involves electromagnetic energy. thermal energy. solar energy. mechanical energy. chemical
Vaselesa [24]
<h2>A wind turbine generating electricity involves electromagnetic energy. thermal energy. solar energy. mechanical energy. chemical energy. nuclear energy.</h2><h2>ans: electromagnetic energy, thermal energy, solar energy, and mechanical energy.</h2>

Explanation:

Wind mill

It consist of shaft pole and blades that can rotate .

It converts wind energy into electrical energy .

The shaft of wind mill is connected to shaft of armature of generator .

When the fast moving wind rotates the blades of windmill its shaft rotates, armature rotates hence electricity is produced which is further used for various purposes .  

Advantage of using wing energy

it is natural renewable resource  

It is eco friendly  

Disadvantage :

1. It cant be established everywhere  

2. It requires large area  

3. It is an expensive project  

4. Wind dosen't blow all the time so win energy cant be produced every time  

5. Minimum speed of wind required is 15km per hour .

So, the wind turbine generating electricity involves mechanical energy of wing and blades .

7 0
4 years ago
A pure radioactive substance has a mass of 30 micrograms but had a mass of 240 micrograms 48 years ago. Assuming that the only c
defon

Answer: Half-life of the substance is 16 years.

Explanation:

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  

t = age of sample  = 48 years

a = initial amount of the reactant = 240 micrograms

a - x = amount left after decay process = 30 microgarms

48=\frac{2.303}{k}\log\frac{240}{30}

k=\frac{2.303}{48}\log\frac{240}{30}

k=0.0433years^{-1}

b) t_{\frac{1}{2}} of reaction  

t_{\frac{1}{2}}=\frac{0.693}{k}=\frac{0.693}{0.0433}=16years

Thus half-life of the substance is 16 years.

7 0
3 years ago
What is the significance of writing the formula of Sodium chloride as NaCl, and Sodium sulfide as Na2S?
vodomira [7]

Answer:

There is 1 Sodium in NaCl, but 2 Sodiums in the sulfide. I can’t write it properly. But the “2” should be a subscript.

Explanation:

6 0
3 years ago
What is the total number of moles (n) of electrons exchanged between the oxidizing agent and the reducing agent in the overall r
Sergeu [11.5K]
Answer:
             5 moles of electrons

Explanation:

The balance equation is as follow,

<span>                   5 Ag</span>⁺ + Mn⁺²<span> + 4 H</span>₂O    →<span>    5 Ag + MnO</span>₄⁻<span> + 8 H</span>⁺

Reduction of Ag:

                         Ag⁺ + 1 e⁻    →    Ag
Or,
                         5 Ag⁺  +  5 e⁻    →    5 Ag

Oxidation of Mn:

                          Mn⁺²   →    MnO₄⁻  +  5 e⁻

Result:
          Hence 5 moles of Ag⁺ accepts 5 electrons from 1 mole of Mn⁺².
4 0
4 years ago
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