4 years ago

I need help on #'s 4 and 5

Chemistry

1 answer:

kompoz [17]4 years ago

3 0

The answer for four is frequency.

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Objects that can bew seen only under magnification

timofeeve [1]

The answer is (D) microscopic. You can remember this, because the name is very close to "microscope," an instrument used to greatly magnify and observe tiny organisms and objects.

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3 years ago

Which expression of distance uses SI units?

Oliga [24]

D) 500 meters
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3 years ago

How many copper(I) ions (atoms of Cu 1+ ) are in a sample of copper(I) sulfate that weighs 35.4 grams?

Keith_Richards [23]

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copper has 2+ ions in a sample of copper

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3 years ago

When an object falls to the ground, potential energy is most likely transformed into

pentagon [3]

Answer:

kinetic energy

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When the object is released, the gravitational potential energy is gradually converted into kinetic energy as it picks up speed.

8 0

3 years ago

Using the Hoffman apparatus for electrolysis, a chemist decomposes 2.3 moles of water into its gaseous elements. How many grams

solong [7]

Answer:

2.318032g

Explanation:

-The electrolysis equation of water is written as below:

$2H_2O_{(l)}->2H_2_{(g)}+O_2_{(g)}$

-The mole ratio of Water to the hydrogen formed is 1:1, therefore 2.3 moles of hydrogen gas is produced.

-Hydrogen's molar mass is 1.00784 grams:

$Mass=moles\times molar \ mass\\\\\=2.3\times 1.00784\\\\=2.318032\ g$

Hence, 2.318032 grams of hydrogen is produced.

7 0

4 years ago