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Science

共有 8553 道题

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Chemistry 共610题

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问答题

What type of reaction always has a product of carbon dioxide and water?

Normal MiddleSchool

9

0

单选题

A C-H bond is an example of what type of bonding?

Normal MiddleSchool

9

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单选题

Which of the following groups of the periodic table contain nearly all of the metalloid elements?

Normal MiddleSchool

5

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问答题

Identify all of the following three particles that would be deflected by a magnetic field: 1) Electr...

Normal MiddleSchool

2

0

问答题

An atom of what element is produced when an atom of krypton-81 undergoes an electron capture?

Normal MiddleSchool

2

0

单选题

A stream is dammed, raising its base level. Which of the following is most likely to happen?

Normal MiddleSchool

3

0

单选题

Which of the following does not affect the reaction rate of the Haber synthesis of ammonia?

Normal MiddleSchool

1

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问答题

What is the greatest integer less than or equal to the log base 3 of 579?

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1

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单选题

For the redox reaction of tin(II) and iron(III) to produce tin(IV) and iron(II), the sum of the coef...

Normal MiddleSchool

1

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问答题

How many neutrons are in an atom of carbon 14?

Normal MiddleSchool

3

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