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Lapatulllka [165]
3 years ago
14

A rubber ball falling vertically bounces off a concrete floor. Just as that ball begins to bounce up, all of its energy is kinet

ic. According to the law of conservation of energy, what forms of energy will this kinetic energy convert to?
A: thermal, sound, light
B: gravitational potential, thermal, sound
C: chemical potential, thermal, light
D: gravitational potential, chemical potential, sound
Chemistry
1 answer:
mylen [45]3 years ago
5 0
B don’t know what light has to do with a ball bouncing
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Aluminum has a density of 2.70 g/cm3. what would be the mass of a sample whose volume is 10.0 cm3?
anastassius [24]
Hey there!

Density = 2.70 g/cm³

Volume = 10.0 cm³

Therefore:

Mass = density *  volume

Mass = 2.70 * 10.0

Mass = 27.0 g
3 0
3 years ago
How many moles of sodium carbonate contain 1.773 × 1017 carbon atoms?
vesna_86 [32]

Answer:

  • 2.941 × 10⁻¹⁷ mol

Explanation:

1) Chemical formula of sodium carbonate: <em>Na₂CO₃</em>

2) Ratio of carbon atoms:

  • The number of atoms of C in the unit formula Na₂CO₃ is the subscript for the atom, which is 1 (since it is not written).

Hence, the ratio is 1 C atom / 1 Na₂CO₃ unit formula.

This is, there is 1 atom of carbon per each unit formula of sodium carbonate.

3) Calculate the number of moles in 1.773 × 10⁷ carbon atoms

  • Divide by Avogadro's number: 6.022 × 10²³ atoms / mol

  • number C moles  = 1.773 × 10⁷ atoms / (6.022 × 10²³ atoms/mol)

  • number C moles = 2.941 × 10⁻¹⁷ mol

Since, the ratio is 1: 1, the number of moles of sodium carbonate is the same number of moles of carbon atoms.

5 0
3 years ago
Which of these is a chemical property of matter?
Hitman42 [59]

Answer:

A. Ability to burn

Explanation:

8 0
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Which of the following is NOT a characteristic of a compound?
MissTica

Answer:

I think it's D

sorry if I'm wrong.

Explanation:

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What are some global problems that material scientists are working to fix
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