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viktelen [127]
4 years ago
8

What is Mendeleev most known for?

Chemistry
1 answer:
fenix001 [56]4 years ago
4 0
Dmitri Mendeleev devised the first periodic table.
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How many moles are in 250 atoms of silver (show work)
Korvikt [17]

Answer:

6.02 x 1023 number of atoms in one mole.

Explanation:

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3 0
3 years ago
In an experimental investigation, the variable that the researcher changes or manipulates in order to see its effects is called
Ghella [55]

Independent variables don't change

Dependent variables change as a result of the alteration made during the experiment

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Kobotan [32]
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Which structures main function is to produce food (sugar) in a plant
bija089 [108]
Chloroplasts is the answer
3 0
3 years ago
Which of the following occurs during a redox reaction?
GenaCL600 [577]

Answer:

C = Electrons are won and lost.

Explanation:

The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining and losing the electrons and oxidation state of elements are changed.

Oxidation:

Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

Reduction:

Reduction involve the gain of electron and oxidation number is decreased.

Consider the following reactions.

4KI + 2CuCl₂  →   2CuI  + I₂  + 4KCl

the oxidation state of copper is changed from +2 to +1 so copper get reduced.

CO + H₂O   →  CO₂ + H₂

the oxidation state of carbon is +2 on reactant  side and on product side it becomes  +4 so carbon get oxidized.

Na₂CO₃ + H₃PO₄  →  Na₂HPO₄ + CO₂ + H₂O

The oxidation state of carbon on reactant side is +4. while on product side is  also +4 so it neither oxidized nor reduced.

H₂S + 2NaOH → Na₂S + 2H₂O

The oxidation sate of sulfur is -2 on reactant side and in product side it is also -2 so it neither oxidized nor reduced.

Oxidizing agents:

Oxidizing agents oxidize the other elements and itself gets reduced.

Reducing agents:

Reducing agents reduced the other element are it self gets oxidized.

3 0
3 years ago
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