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alexandr402 [8]
2 years ago
7

What element makes up about 90% of the known universe?

Chemistry
1 answer:
Alika [10]2 years ago
3 0

Hydrogen

Explanation:

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Positron emission of technetium-95
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Idk it’s making me answer a question in order to get help on my own
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3 years ago
What is the charge of a magnesium ion?
kupik [55]

2+ charge electrons of course


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4 years ago
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Carbon has an atomic number of 6. How many electrons are in a carbon atom’s second energy level?
matrenka [14]
Carbon is an atom so electrons=protons 
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3 years ago
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2Al+3Cl2⟶2AlCl3
Leviafan [203]

Answer:

7.335 moles of  Cl₂ are required to react with 4.89 miles of Al.

Explanation:

Given data:

Moles of Al = 4.89 mol

Number of moles of Cl₂ required = ?

Solution:

Chemical equation:

2Al + 3Cl₂    →   2AlCl₃

Now we will compare the moles of Al and chlorine from balance chemical equation.

                            Al           :         Cl₂

                             2           :           3

                            4.89      :         3/2×4.89 =7.335 mol

Thus, 7.335 moles of  Cl₂ are required to react with 4.89 miles of Al.        

8 0
3 years ago
Molecules that have the same chemical formula (same numbers of each atom) but different three-dimensional shapes are called ____
katen-ka-za [31]

The given blank can be filled with isomers.  

The isomers in chemistry refers to the molecules or ions with similar formulas, but different compositions. The isomers refer to the molecules that exhibit the same chemical formula, however, distinct three-dimensional shapes. Though isomers do not always share identical properties. The two prime forms of isomerism are stereoisomerism or spatial isomerism and structural isomerism or constitutional isomerism.  


3 0
4 years ago
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