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Gekata [30.6K]
3 years ago
9

The first known telescopes, used around 1600, consisted of a lens and an eyepiece. Today, telescopes are often computer controll

ed and consist of a complicated array of sophisticated lenses. Which statement correctly describes how telescopes have changed over time?
Chemistry
1 answer:
Veseljchak [2.6K]3 years ago
4 0

Answer:

B.

Explanation:

The telescopes of the 1600s were gradually improved upon over time, resulting in the telescopes that are available today.

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Which condition increases the number of collisions between reactant molecules in a given volume?
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Answer:

Increasing Surface Area

Explanation:

A greater surface area (meaning more, smaller particles) allows for more opportunity for particles to collide.  On the other hand, decreasing temperature and removing a catalyst would only decrease the number of collisions, and the clumping option doesn't make much sense.  Hope this helps!

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3 years ago
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A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4
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Answer:

83.20 g of Na3PO4

Explanation:

1 mole of Na3PO4 contains 3 moles of Na+.

Mole of Na ion to be prepared = Molarity x volume

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If 1 mole of Na3PO4 contains 3 moles of Na ion, then 0.5075 Na ion will be contained in:

           0.5075/3 x 1 = 0.1692 mole of Na3PO4

mole of Na3PO4 = mass/molar mass = 0.1692

Hence, mass of Na3PO4 = 0.1692 x molar mass

                                     = 0.1692 x 163.94

                                        = 83.20 g.

83.20 g of Na3PO4 will be needed.

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Answer: it’s b)

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Mg gained mass because it went from being a single element (on the reactant side) to being a molecule (on the product side).

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