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3 years ago

Who created the first compound microscope and telescope?

Chemistry

2 answers:

vesna_86 [32]3 years ago

8 0

Answer:

Janssen

Explanation:

-BARSIC- [3]3 years ago

6 0

Answer:

Hans Martens/Zacharias Janssen

Explanation:

Janssen was the son of a spectacle maker named Hans Janssen, in Middleburg, Holland, and while Zacharias is credited with inventing the compound microscope, most historians surmise that his father must have played a vital role, since Zacharias was still in his teens in the 1590s.

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notka56 [123]

Answer:

Butter is a mixture of pure substances.

Explanation:

just poop and you will see

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3 years ago

How did Niels Bohr describe electrons in his atomic model

Reptile [31]

Answer: Bohr proposed his quantized shell model of the atom to explain how electrons can have stable orbits around the nucleus.

so C would seems to be right.

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3 years ago

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After reading a book about parrots, Tani wants to learn more about them. Which question could be answered through scientific inv

FrozenT [24]

After reading a book about parrots, Tani wants to learn more about them. The question that could be answered through scientific investigation is letter B, ‘<span>What substances make up an eggshell?’ The other choices cannot be answered through scientific investigation.</span>

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3 years ago

Hello! for titration method , why is alkali used instead of bases?

34kurt

Your question has been heard loud and clear.

Uhm , Alkalis are just bases who react with water. In titration we use water also , so we need bases that react with water , and such bases are alkalis.

Alkalis are a type of bases.

Thank you

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3 years ago

Ammonia (NH3) reacts with sulfuric acid to form ammonium sulfate. How many grams of ammonium sulfate are obtained from 8.73 g of

Gwar [14]

I hope you understand my working:
1) Finding the mol of NH3 to find the mol of (NH4)2SO4 (ammonium sulfate)
2) Mr of (NH4)2SO4
3) Theoretical yield: The actual grams of (NH4)2SO4 produced when reacting 0.514 mol of NH3 to 0.514 mol H2SO4
4) Using formula of (given grams)/(theoretical grams or actual grams) * 100 = 73%
5) Basic algebra

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3 years ago