When the highest occupied energy level of an atom is completely full of electrons, the atom is ____________________________

William measures a test tube and finds that the mass of the test tube is 5g. He places the lone reactant in the test tube and fi

iogann1982 [59]

86 percent is the percent yield for this experiment if he expected to produce 5g of product.

Explanation:

Given that:

mass of test tube = 5 grams

mass of test tube + reactant is 12.5 grams

mass of reactant = ( mass of test tube + reactant ) - (mass of test tube)

mass of reactant = 12.5 -5

= 7.5 grams

when 7.5 grams of reactant is heated mass of test tube was found to be 9.3 grams.

so mass of product formed = 9.3 - 5

= 4. 3 grams of product is formed (actual yield)

However, he expected the product to be 5 grams (theoretical yield)

Percent yield = $\frac{actual yield}{theoretical yield}$ x 100

putting the values in the formula:

percent yield = $\frac{4.3}{5}$ x 100

= 86 %

86 percent is the percent yield.

5 0

3 years ago

Draw three different Lewis structures that could be possible for ZX2, assuming that Z is the central atom and that X is not hydr

Mariana [72]

Answer:

See images attached and explanation

Explanation:

I have drawn three possible structures of ZX2. We have to remember that the shapes of molecules could be predicted on the basis of the Valence shell electron pair repulsion theory.

The number of electrons on the valence shell of the central atom determines the shape of the molecule. We have also been told that X is not hydrogen.

If the two X atoms are arranged at a bond angle of 180 degrees, we could have either structure I or II. We will have these structures if the Z atom is sp2 hybridized.

Similarly, if the Z atom is sp3 hybridized, we may have structure III in which the molecule is bent with a bond angle less than 109 degrees. This may result from the presence of a lone pair on Z.

Note that all these structures obey the octet rule.

3 0

3 years ago

Helium is the second most abundant element in the universe, but it is rare in Earth’s atmosphere. Most of the helium used to fil

topjm [15]

Explanation:

Helium is produced in radioactive process that occurs in deep and underground formations. They differ from other atmospheric gases. These radioactive decay of heavier nuclides that are unstable started about the time when the earth was formed.

As they decay they give off lighter particles that can easily be broken down into more stable ones.
One of the main product of the decay is alpha particles.
They have the same atomic structure as helium
These materials are trapped in underground formations.

8 0

3 years ago

Hey I'm Chloe can you Help me, Thank you :)<br> How does photosynthesis use solar energy?

harina [27]

When a plant goes through photosynthesis, it uses light energy and converts it into chemical energy

4 0

3 years ago

Read 2 more answers

I need to know how to get a boy to like me

sergejj [24]

Answer:

To get a boy to like you you have to 1.dress up cutely