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kow [346]
4 years ago
10

Which is TRUE about physical changes but not chemical changes?

Chemistry
1 answer:
Naily [24]4 years ago
3 0
B

No new substances are made
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A sample of thorium-234 has a half life of 25 days. Will the thorium undergo rafioacrive decay and be completely gone in 100 day
Sunny_sXe [5.5K]
I don't know terribly much about radioactive decay, but yes, it WILL decay. If it's half life is 25 days, it will be completely consumed in 50 days. By 100 days, it should be long gone. As far as I know, the reason for this is (besides the simple math which is self-explanatory) the Thorium has so many protons/neutrons, it's unstable and thus undergoes radioactive decay as it cannot maintain stable form.

I hope this helps! :) 
6 0
4 years ago
Volume is a measurement of how fast particles of a substance are moving.
love history [14]
That is false, volume is the amount of space that a substance or object occupies
3 0
3 years ago
1. How is the number of energy levels in an atom related to the period number?
Natalka [10]

Answer:

The highest energy level number (1 through 7) for the electrons in an atom corresponds to the period (or row) in the periodic table to which that atom belongs. Because there are 7 periods in the table, there are 7 energy levels. For example, hydrogen (H) is in the first period, so it has only one energy level.

4 0
3 years ago
How many atoms are present in 0.529 moles of Li?
nirvana33 [79]

Answer:

<h2>3.18 × 10²³ atoms</h2>

Explanation:

The number of atoms can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 0.529 × 6.02 × 10²³

We have the final answer as

<h3>3.18 × 10²³ atoms</h3>

Hope this helps you

6 0
3 years ago
If you are given the mass number and atomic number of an atom explain how you would find the number of protons neutrons and elec
astra-53 [7]
Atomic number is same number as the protons...

Neutrons =  Mass number - Atomic number ( protons)

Electrons are same number as protons unless the element has a charge..
If it has a charge of +2 it means that the element has 2 less electrons than the neutral atom. If it has a charge of -2 it means that the element has 2 more electrons than what it is supposed to..
5 0
3 years ago
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