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OlgaM077 [116]
3 years ago
13

Which of the following properties decreases from left to right across a period? *

Chemistry
1 answer:
Anna71 [15]3 years ago
8 0
Atomic radius atomic number ionization energy and then electronegativity
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the half life of a certain element is 100 days. how many half-lives will it be before only one-fourth of this element reamains
Rama09 [41]

Answer:

200 Days

Explanation:

Usually not so good in chemistry, but this is math!

Half life means in this time half goes away.  What happens when two half lives pass?  half of what was remaining goes away.  Maybe an example will make it more clear.

Say we start with 100 grams.  After the amount of time for the half life to pass completes, we have 50, or half of the original amount.  The half life time passes again and THAT gets cut in half to 25 grams.  this is 1/4 of the original (Hey, what we're looking for.)  Just to make it clear what is happening after another half life 1/8 remains, so it goes from The starting amount to 1/2 to 1/4 to 1/8 and so on, it keeps getting cut in half.

So how many times do we have to cut 1 in half until we get to 1/4?  Twice as was shown before.  Now, two half lives for this element is what?  100+100 days.  So 200 Days.

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3 years ago
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The protons! Is it the answer
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3 years ago
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Adding energy to a solid bar of gold may result in which of the following outcomes
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An increase in motion and less attraction between particles

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A 0.227 mol chunk of dry ice (solid CO2) changes to gas. What is the volume of that gas measured at 27 °C and 740 mmHg?
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Explanation:3.2 ft 2 fti2 ft 4 ft ft2

4 0
2 years ago
the amount of water on Earth is _______but the form and location of the water _______ as it moves through the hydrologic cycle
Lorico [155]

Hey there!

I can't be sure my answers are the exact words, but it should be something along the lines of...

The amount of water on Earth is constant, but the form and location of the water changes as it moves through the water cycle.

This means that Earth has always had the same amount of water within in, along with it being the same water the whole time. No new water was introduced to our planet. Some of our water is liquid, some is solid, and some is gas. Some is deep in the soil and some is high up in the atmosphere. Some is in rain and some is in snow.

I hope this helps!

6 0
3 years ago
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