3 years ago

Define new periodic table

1 answer:

6 0

The old periodic table orders the elements based on their atomic mass. But the new periodic table orders the elements according to their atomic mass. This is a major change. Therefore, the elements are placed in completely new positions on the periodic table.

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4 years ago

Calculate the volume of a box, in cubic centimeters, which is 423 cm long, 12 cm wide, and 25 cm high. Report your answer with c

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Answer:

130,000 cubic centimeters

Explanation:

The volume of a box is its length multiplied by its width multiplied by its height (lwh). 423 times 12 times 25 is 126,900. When multiplying, the number of significant figures is the same as the number with the least number of significant figures. The correct number of significant figures in this example is 2, so 126,900 would need to round up to 130,000 in order to have 2 significant figures.

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3 years ago

What is the energy of light with a wavelength of 589 nm? (The speed of light in a vacuum is 3.00 x 10^8 m/s, and Planck's consta

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Answer:

Explanation:

$\frac{6.626\cdot10^{-34}\cdot\left(3\cdot10^{8}\right)}{589}$ = 3.37 x 10^-28 J