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storchak [24]
2 years ago
6

ASAP will give brainliest!!!

Chemistry
2 answers:
Ahat [919]2 years ago
8 0

Answer:

For me

Explanation:

It's Cu because other compound contains negative radicals

DENIUS [597]2 years ago
4 0

Answer:

It’s the 3rd one

Explanation:

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Explain why energy sources do not have 100% efficiency. Why do you think some have lower efficiencies?
bearhunter [10]

Answer:

Energy sources do not have 100% efficiency because <em>the processes of energy conversion to usable forms involves energy losses. </em>

Some have lower efficiencies due to; <u>energy losses in form of heat</u> during conversion, <u>poor technology applied during conversion</u> of energy and<u> lack of desire equipment</u> to use in the energy conversion system.

Explanation:

The desired form of energy for use is derived from conversion of energy from the source using an energy converter into another form which is usable. The efficiency of the energy converter is calculated as;

л = output energy/input energy

The efficiency of energy is limited to the cost of equipment required for conversion from energy source by the energy converter to a form which is usable. Additionally, because energy sources are scarce, the technology to use in energy  conversion is a factor affecting energy efficiency in that high efficiency will require advanced technology with better equipment leading higher costs of that energy form. when heat losses are involved during energy conversion, efficiency lowers, thus its better if such losses are used as energy input in another system.

5 0
2 years ago
Is sulfur dioxide a compound, mixture or element? Thanks!
horsena [70]
It is a compound because a compound is two or more different elements chemically combined.
5 0
2 years ago
Students conducted an investigation into the three elements listed above. What type of element should Sulfur be labeled?
soldier1979 [14.2K]
MetAllllllllllllllll
7 0
2 years ago
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Word elements can be used to show chemical reactions. When hydrogen burns in oxygen. Water is produced. The word equation is hyd
frez [133]
Iron + sulphur - iron sulphide
8 0
3 years ago
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A reaction between 46 grams of sodium and 71 grams of chlorine formed table salt and heat.
vazorg [7]

Answer:

d. 117 grams

Explanation:

The mass of the table salt produced will be 117 grams.

Chemical reactions obey the law of conservation of mass. In this regard, matter is neither created nor destroyed in the course of a chemical reaction. It is expected that the mass of the reactants and products remain the same.

 The reaction expression:

         2Na + Cl₂  →   2NaCl

So, mass of sodium  = 46g

      mass of chlorine formed = 71g

Mass of NaCl  = 46 + 71 = 117g

7 0
3 years ago
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