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aivan3 [116]
3 years ago
15

How do you do this?

Chemistry
1 answer:
Alona [7]3 years ago
7 0
It would be Atom 2 because the proton and neutron are both nine and the election is 8 which is -1 to nine <span />
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___________ minerals are dark-colored because they contain _____________. a. Mafic; iron and/or magnesium b. Felsic; iron and/or
Likurg_2 [28]

Answer:

A. Mafic; iron and/or magnesium

Explanation:

Let's find the answer by naming some minerals and their chemistry.

Mafic minerals are dark-colored whereas felsic minerals are light-colored, thats way mafic rocks are dark-colored because they are mainly composed by mafic minerals and the other way around for felsic rocks.

But remember that mafic minerals as amphiboles, pyroxenes or biotites, involve in their chemical structure iron and/or magnesium. Although calcium and sodium can be incorporated in amphiboles and clinopyroxenes, they are not involved in orthopyroxenes and biotites. On the other hand, although potassium is involved in biotite and in some extent in amphiboles, this element is not involved in pyroxenes.

So in conclusion, mafic minerals are usually dark-colored because they involve iron and/or magnesium in their chemical structures.  

4 0
3 years ago
What electrons in an atom take part in chemical bonding, and what are they called
nignag [31]

Explanation:

The electrons in the outermost electron shell are responsible for forming chemical bonds. These electrons are also known as valence electrons

4 0
3 years ago
How many atoms are there in 1 mol of an element?
sergeinik [125]

Answer:6.022x10^23

Explanation:

7 0
3 years ago
A hydrocarbon (an organic compound containing only C and H) is found to be 7.74% H. If the molecular weight is known to be betwe
ivann1987 [24]
The molecular weight is between 70 and 85. Let's accidentally pick some quantity in amid, like 78. 
7.74% of 78 is how many 'u' there are of H: 
78 u * 7.74% = 78 u * .0774 = 6.0372 u 
The only hydrocarbon below that has 6 hydrogens is C6H6. We can even check this answer: 
Total u = 6C + 6H 
= 6(12.01) + 6(1.0079) 
= 78.11 u 
6(1.0079) / 78.11 * 100 = 7.74%
4 0
3 years ago
Which of the following statements about the brain is true? a. The skull could support as much as 3 tons of weight. b. The brain
Thepotemich [5.8K]

Answer:

a. The skull could support as much as 3 tons of weight.

Explanation:

The true statement about brain is  

a. The skull could support as much as 3 tons of weight.

The cranium(skull) bones are slot like a jigsaw puzzle together. All but one of these bones is fixed in place in adults. It makes the skull very solid. Babies have holes between the cranial (skull) bones so that as they are born, their heads may withstand being crushed.

rest all statements are wrong.

8 0
3 years ago
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