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Paladinen [302]
3 years ago
15

Which pair are classified as chemical substances? Pick two.

Chemistry
1 answer:
maria [59]3 years ago
8 0
Elements and compounds. This is because in solutions and mixtures the substances are not bonded to each other or pure, you can separate and purify substances in solutions and mixtures (via techniques such as distillation, filtering) but you cannot separate compounds as they are bonded together.
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WILL MARK YOU BRAINLIEST!! how are a elements abundance in nature and percent composition related
Drupady [299]
Because they both have to do with and chemistry science
8 0
3 years ago
What characteristics do the elements in a group share? In a period, share?
Katyanochek1 [597]

Answer:

The elements in same period have same principle quantum number or energy shell.

The elements in same group shows similar chemical and properties.

Explanation:

Inn group:

The elements in same group i.e present in vertical column shows similar chemical properties.

The elements in same group having same number of valance electrons. while in chemical reaction bonds are break and formed and valance electrons are involved. That's why elements in same group having same number of valance electrons and shows similar chemical properties.

In period:

While as we move from left to right the number of valance electron increase by one in every element. But the electron is added in same shell which means that their physical and chemical properties are different but principal quantum number is same.

3 0
3 years ago
What type of chemical reaction involves 2 or more elements combining to form one?
Vikki [24]
Hey there!

I believe the answer is Combination (or Synthesis) Reaction. 
6 0
3 years ago
What can you infer from the fact that nitrogen gas is useless to animals?
makvit [3.9K]

Answer:

Denitrification changes nitrogen into a gaseous form.

Explanation:

3 0
2 years ago
Write a Balanced Equation <br><br><br><br> H2 + Cl2 --&gt; __HCl
Mariana [72]

Answer:

2HCL

Explanation:

Both the elements have 2 so when placing the 2 infront ,it'll distribute/ apply to both

7 0
3 years ago
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