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yKpoI14uk [10]
3 years ago
7

(worth 10pts!!!!!!) What did Dmitri Mendeleev contribute to science? A. He arranged the first periodic table. B. He developed th

e first model of the atom. C. He discovered many unknown elements . D. He developed the first atomic theory
Chemistry
2 answers:
MAVERICK [17]3 years ago
6 0

Answer:

A.

Explanation:

vesna_86 [32]3 years ago
3 0

Answer:

A. He arranged the first periodic table.

Explanation:

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Determine whether each description represents a genotype or a phenotype.
ANEK [815]

Answer:

phenotype,phenotype,genotype,genotype,

genotype

Explanation:

phenotype is physical appearance and genotype is just like

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8 0
3 years ago
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The following equation represents the type of reaction called
Mazyrski [523]

Answer:

Reduction

Explanation:

Reduction:

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

Mn⁺⁷ +3e⁻    →    Mn⁴⁺

Mn gets three electrons , its oxidation state reduced from +7 to +4 so Mn gets reduced.

Examples:

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.

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.

6 0
3 years ago
Both Sydney, Australia and Guangzhou, China are on the East coasts of continents in the Pacific Ocean. Why are their yearly temp
cestrela7 [59]

Answer:

All of the above

Explanation:

(I'm assuming you meant to put Australia in the options)

Australia is in the southern hemisphere and has its summer in December etc. and Winter in July etc.

China is in the northern hemisphere and has its summer in July etc and Winter in December etc.

6 0
3 years ago
ASAP someone help ASAP
Sonbull [250]

sunlimation is when a solid goes to a gas thats all i can awnser i havent got that far in chemistry yet.

4 0
3 years ago
What is the best description of the energy stored in a stretched or compressed object.
oksian1 [2.3K]

Answer:

Elastic Potential Energy

4 0
3 years ago
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