3 years ago

What happens to thermal energy as objects are heated up and cooled down?

1 answer:

8 0

Answer:

The faster they move, the more kinetic energy they have. When an object is hot, the particles move faster. As it cools, the particles move more slowly. Particles move faster in hot objects than in cooler objects.

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All atoms of the same element must have the same number of what?

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A. protons

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Why must humans find substitutes for many minerals found on Earth? (A) form at an extremely slow rate (B) controlled by other co

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Reliable results are results that can be... A: communicated B: evaluated C: duplicated

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Reliable results are results that can be... A: Communicated

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An element has an atomic mass of 69.66 amu. It has two

marin [14]

Answer: 63.26%

Explanation:

If we let the abundance of the first isotope be x, then:

$69.66=(68.9255)(x)+(70.9247)(1-x)\\69.66=68.9255x+70.9247-70.9247x\\-1.2647=-1.9992x\\x=\frac{-1.2647}{-1.9992} \approx 0.6326$

Which is equal to 63.26%

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1 year ago

Will give brainlsit need answers asap!

k0ka [10]

Answer:

120 g of NaCl in 300 g H20 at 90 C

Explanation:

At x = 90 go vertical to the line for NaCl...then go left to the y-axis to find the solubility in 100 g H20 = 40

we want 300 g H20 so multiply this by 3 to get 120 gm of NaCl in 300 g

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2 years ago