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Sonja [21]
2 years ago
13

How much of strontium-90 will be left after 40 hours if you start with 960 grams and the half-life is 10 hours?

Chemistry
1 answer:
zmey [24]2 years ago
7 0

Answer:

5 hours

Explanation:

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Many grams of aluminum are required to produce 3.5 moles Al2O3 in the presence of excess O2?
Aleks [24]
The  grams  of aluminum  that are required   to produce  3.5  moles of AlO3  in  presence of excess O2   is calculated as  below

write  the  equation for reaction
4 Al + 3O2 =2 Al2O3

by use of mole  ratio between  Al  to  Al2O3   which  is  4 :2  the moles of  Al 
=3.5 x4/2 = 7  moles

mass of Al  =  moles /   x molar mass

= 7 moles  x27 g/mol  =189  grams

4 0
2 years ago
What type of mirror should be used for this application? Explain why this mirror is the right choice for a telescope.
Artyom0805 [142]

Answer:

use a concaved miror

Explanation:

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2 years ago
What is the name of an atom with 3 protons and 4 neutrons?
asambeis [7]

Answer:

Those with 3 protons and 3 neutrons are known as the isotope lithium-6. Those with 3 protons and 4 neutrons are known as the isotope lithium-7.

Explanation:

4 0
3 years ago
Read 2 more answers
Ions stick together with<br> A . Covalent bonds <br> B. Negative bonds<br> C. Ionic bonds
zysi [14]
The answer is C ionic bonds
8 0
2 years ago
Which of the following is most likely to be covalent?<br> MgO <br> CO <br> CaO <br> BaO
Kisachek [45]

Answer:

CaO

Explanation:

CaO is the only compound that is a non-metal and a non-metal. The rest of the compounds are ionic, or metal and non-metal.

8 0
2 years ago
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