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3 years ago

1.The protons in the nucleus attract electrons. True False

1 answer:

6 0

1. True ( they attract one another)

2. False (they have no charge neutron=neutral)

3. False (they've discovered 118)

4. False (an element is a substance made of a single type of atom)
Hope it helps!

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Molecules that are optically active due to the tetrahedral arrangement of bonds around the carbon atom are often referred to as

morpeh [17]

Answer:
Molecules that are optically active due to the tetrahedral arrangement of bonds around the carbon atom are often referred to as Chiral Molecules.

Explanation:
Chiral molecules have stereogenic centers. When plane polarized light is fall on these compounds they rotate the light either in clockwise or anti clockwise direction. The mirror images of chiral moleculecules are non-superimposable. Below few examples for molecules containing chiral centers are given.

6 0

3 years ago

How does a balanced chemical equation demonstrate the Law of Conservation of Mass?

Gelneren [198K]

Answer:

it shows that no atom have been gained or loosed in that reaction

3 0

3 years ago

4 points 9. Name the scientists that played a major role in the development of cell theory. *

jeyben [28]

The answer would be Theodore Schwann, Matthias Jakob Schleiden and Rudolf Virchow(he contributed but is not credited)

Hope this helps

Have a great day/night

5 0

3 years ago

Suppose 3.68g of zinc was allowed to react with hydrochloric acid to produce zinc chloride and hydrogen gas. How much zinc chlor

valentina_108 [34]

Answer:

Percent yield = 86.2%

Explanation:

Given data:

Mass of zinc = 3.68 g

Mass of zinc chloride = ?

Percent yield = ?

Actual yield = 7.12 g

Solution:

Chemical equation:

Zn + 2HCl → ZnCl₂ + H₂

Number of moles of zinc:

Number of moles = Mass /molar mass

Number of moles = 3.68 g / 65.38 g/mol

Number of moles = 0.06 mol

Now we will compare the moles of ZnCl₂ with zinc.

Zn : ZnCl₂

1 : 1

0.06 : 0.06

Theoretical yield of zinc chloride:

Mass of ZnCl₂ = moles × molar mass

Mass of ZnCl₂ = 0.06 mol × 136.286 g/mol

Mass of ZnCl₂ = 8.2 g

Percent yield:

Percent yield = actual yield / theoretical yield × 100

Percent yield = 7.12 g/ 8.2 g × 100

Percent yield = 86.2%

7 0

4 years ago

A rapidly falling object at a high altitude has _____

alisha [4.7K]

A. high potential energy and zero kinetic energy.

7 0

4 years ago