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Murrr4er [49]
2 years ago
5

Consider the elements in the periodic table. The stair-step line between the pink squares and the yellow squares separates the _

__________ (pink) from the _____________ (yellow).
A) gases; solids
B) metals; nonmetals
C) nonmetals; metals
D) reactive; nonreactive
Chemistry
2 answers:
Maru [420]2 years ago
4 0
I believe the correct answer from the choices listed above is option B. The stair-step line between the pink squares and the yellow squares separates the metals <span>from the nonmetals. Hope this answers the question. Have a nice day.</span>
kkurt [141]2 years ago
3 0

Answer: Option (B) is the correct answer.

Explanation:

The stair-step line in periodic table usually separates metals from non-metals. On the left side of this line metals are placed which are represented by pink squares in this case.

Whereas on the right side, non-metals are placed which are represented by yellow squares in this case.

Thus, we can conclude that the stair-step line between the pink squares and the yellow squares separates the metals (pink) from the non-metals (yellow).

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A gas cylinder filled with nitrogen at standard temperature and pressure has a mass of 37.289 g. The same container filled with
andrew-mc [135]

Answer:

Molar mass = 3.9236 g/mol ≅ 4 g/mol

This corresponds to Helium gas.

Explanation:

Let the moles of nitrogen gas = x moles

Moles of carbon dioxide = x moles ( As both are filled at same temperature and pressure conditions )

Given:

Mass_{Container}+Mass_{Nitrogen\ gas}=37.289\ g

Molar mass of nitrogen gas, N_2 = 28.014 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

x\ moles= \frac{Mass}{28.014\ g/mol}

Mass of nitrogen gas = 28.014x g

So,

Let, Mass_{Container}=y

y+28.014x=37.289

Similarly,

Mass_{Container}+Mass_{Carbon\ dioxide\ gas}=37.440\ g

Molar mass of nitrogen gas, CO_2 = 44.01 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

x\ moles= \frac{Mass{44.01\ g/mol}

Mass of nitrogen gas = 44.01x g

So,

y+44.01x=37.440

Solving the two equations, we get :

Mass_{Container}=y=37.025\ g

x = 0.00943 moles

Thus, Given:

Mass_{Container}+Mass_{Unknown\ gas}=37.062\ g

37.025\ g+Mass_{Unknown\ gas}=37.062\ g

Mass of the gas = 0.037 moles

Moles = 0.00943 moles

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

0.00943\ moles= \frac{0.037\ g}Molar mass}

Molar mass = 3.9236 g/mol ≅ 4 g/mol

This corresponds to Helium gas.

7 0
2 years ago
You have two compounds that you have spotted on the TLC plate. One compound is more polar than the other. You ran the TLC plate
goldenfox [79]

Answer:

we will except an increase in the polarity of the system and this will cause the Non-polar spot to be near the solvent front, while the polar spot will run at an approximate speed of 0.5 Rf

Explanation:

when we run a TLC plate in a 50/50 mixture of hexanes and ethyl acetate we will except an increase in the polarity of the system and this will cause the Non-polar spot to be near the solvent front, while the polar spot will run at an approximate speed of 0.5 Rf

The speed of the polar spot depends largely on the level of polarity, an increase in the polarity will see both spots of Neat hexane run when we run a TLC  plate in a 50/50 mixture of hexanes and ethyl acetate

3 0
2 years ago
To test how fertilizer affects aquatic animals, a student prepared four identical containers with water fleas. the student then
Vera_Pavlovna [14]

The control group in this experiment is the one with just distilled water. It is plain so they can use it to compare the other tests against.

5 0
2 years ago
Read 2 more answers
Which sentences describe alpha particles? Check all that apply 1. Alpha particles consist of two protons and two neutrons 2. Alp
Masja [62]

thanks for the answers ッ. (btw they’re on the bottom of the question if anyone doesn’t see it.

4 0
2 years ago
Read 2 more answers
The first step in the Ostwald process for producing nitric acid is 4NH3(g) + 5O2(g) -&gt; 4NO(g) + 6H2O(g). If the reaction of 1
aniked [119]

Answer: The percentage yield of the given reaction is 77.33%.

Explanation:

Moles is calculated by using the formula:

Moles=\frac{\text{Given mass}}{\text{Molar mass}}

  • Moles of Ammonia:

Given mass of ammonia = 150g

Molar mass of ammonia = 17 g/mol

Putting values in above equation, we get:

\text{Moles of ammonia}=\frac{150g}{17g/mol}=8.82moles

  • Moles of Oxygen

Given mass of oxygen = 150g

Molar mass of oxygen = 32 g/mol

Putting values in above equation, we get:

\text{Moles of oxygen}=\frac{150g}{32g/mol}=4.6875moles

For the given chemical equation:

4NH_3(g)+5O_2(g)\rightarrow 4NO(g)+6H_2O(g)

By Stoichiometry,

5 moles of oxygen reacts with 4 moles of ammonia.

So, 4.6875 moles of oxygen will react with = \frac{4}{5}\times 4.6875=3.75moles of ammonia

As, moles of ammonia required is less than the calculated moles. Hence, ammonia is present in excess and is termed as excess reagent.

Therefore, oxygen is considered as a limiting reagent because it limits the formation of products.

By Stoichiometry of the given reaction:

5 moles of oxygen gas produces 4 moles of nitric oxide

So, 4.6875 moles of oxygen gas will produce = \frac{4}{5}\times 4.6875=3.75moles of nitric oxide

Now, to calculate the theoretical amount of nitric oxide, we use equation 1:

Molar mass of nitric oxide = 30 g/mol

3.75mol=\frac{\text{Given mass}}{30g/mol}

Given mass of nitric oxide = 112.5 g

Now, to calculate the percentage yield, we use the formula:

\%\text{ yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100

Experimental yield = 87 g

Theoretical yield = 112.5 g

Putting values in above equation, we get:

\%\text{ yield}=\frac{87}{112.5}\times 100=77.33\%

Hence, the percentage yield of the given reaction is 77.33%.

5 0
2 years ago
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