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Step2247 [10]
3 years ago
14

Which of the following elements have seven valance electrons in its outer shell?

Chemistry
2 answers:
lina2011 [118]3 years ago
8 0

Answer:

Flourine

Explanation:

Its at the 17 group number which are where the halogens are located.

Svet_ta [14]3 years ago
3 0

Answer:answer in explanation

Explanation:

Easy fluorine

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Compare and contrast the functions of each of the following types of flasks: filter, Erlenmeyer, volumetric.
harkovskaia [24]
The Erlenmeyer Flask was <span>introduced in 1861 by German chemist </span>Emil Erlenmeyer and is shaped like a cone. This has a triangular shape and mouth wide for it to be easier to pour and store liquids. The Volumetric flask<span> is used for preparing liquids with volumes of high precision. It has a </span>pear-shaped body and a long neck with a circumferential fill line. The Filter Flask is also known as the <span>A Büchner </span><span>flask. It is like the Erlenmeyer but this one is thick-walled and has a special arm in the side. It is used for filtering liquid. </span>
4 0
3 years ago
Brainliest and 50 points to best answer!
Anon25 [30]

What subject is this again ? If I know now then I would have a better understanding of what I’m gonna answer so you don’t get it wrong !

7 0
3 years ago
My theoretical yield of beryllium chloride was 10.7 grams. If my actual yield was 4.5 grams, what was my percent yield?
artcher [175]

Answer:

The percent yield of this reaction is 42.1 % (option B)

Explanation:

Step 1: Data given

Theoretical yield of beryllium chloride = 10.7 grams

actual yield of beryllium chloride = 4.5 grams

Step 2: Calculate the percent yield for this reaction

Percent yield = (actual yield / theoretical yield) * 100%

Percent yield = (4.5 grams / 10.7 grams ) * 100 %

Percent yield = 42.1 %

The percent yield of this reaction is 42.1 % (option B)

6 0
3 years ago
Calculate the molarity of a kcl solution prepared by dissolving 0.898 moles of kcl in 250. ml of water
prohojiy [21]
  the molarity  of KCl  solution prepared by dissolving 0.898 mole of KCl in 250 ml water  is calculated using the below  formula

 molarity= moles/volume in liters

moles= 0.898 moles
volume in liters= 250/1000 =0.25 liters

molarity is therefore= 0.898/0.25= 3.592 M
3 0
3 years ago
Use VSEPR theory to decide which one of the following molecules and ions will definitely have at least one 90° bond angle in it.
seraphim [82]

Answer:

(C) PCl₅

Explanation:

(A) AlCl₄⁻

The central atom has 4 bond pairs and 0 lone pair. Hybridization is sp³. The geometry is tetrahedral which has an angle of 109.5°.

(B) NH₃

The central atom has 3 bond pairs and 1 lone pair. Hybridization is sp³. The geometry is pyramidal which has an angle of approximately 107.5°.

(C) PCl₅

The central atom has 5 bond pairs and 0 lone pair. Hybridization is sp³d². The geometry is trigonal bipyramidal in which the equatorial bonds has an angle of 120° and axial bond has an angle of 90°.

(D) CO₂

The central atom has 4 bond pairs and 0 lone pair. Hybridization is sp. The geometry is linear which has an angle of 180°.

(E) H₂O

The central atom has 2 bond pairs and 2 lone pairs. Hybridization is sp³. The geometry is bent shape which has an angle of approximately 105.5°.

8 0
3 years ago
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