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Sav [38]
3 years ago
11

There are ________ groups on the Periodic Table and __________ periods on the Periodic Table. (Type your answers as numbers)

Chemistry
2 answers:
Allisa [31]3 years ago
8 0

Answer:

8 and 7

Explanation:

JulijaS [17]3 years ago
6 0

Answer:

There are 18 groups on the periodic table and there are 7 periods

Explanation:

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Which of the following is the correct model of C3H18? ​
Montano1993 [528]

Answer:

B.

General Formulas and Concepts:

<u>Chemistry - Organic</u>

  • Hydrocarbons
  • Bond-Line Notation: Each "arrow" point represents a carbon and the lines represent a bond between the carbons. Hydrogens are assumed added when drawing the molecular formulas

Explanation:

We are given C₈H₁₈. We need a Bond-Line notation where there are 8 "arrow" points (which represent Carbon). We can disregard the Hydrogens as they are assumed to take the rest of the bonds.

Only option B has a value of 8 carbons, represented by the "arrow" points. Therefore, it is the correct answer.

7 0
3 years ago
Guy plzz help me the this and thanks
ad-work [718]

Answer:

<h2>18 {cm}^{3}</h2>

Explanation:

<em><u>In</u></em><em><u> </u></em><em><u>first</u></em><em><u> </u></em><em><u>picture</u></em><em><u>,</u></em>

When rock was not in the cylinder,

Volume of water

=  {18cm}^{3}

<em><u>In</u></em><em><u> </u></em><em><u>second</u></em><em><u> </u></em><em><u>picture</u></em><em><u>,</u></em><em><u> </u></em>

When rock is in the cylinder,

Volume of water

=  {36cm}^{3}

<em><u>Hence</u></em><em><u>,</u></em>

Volume of rock

= 36 {cm}^{3}  -  {18cm}^{3}

= 18 {cm}^{3} (ans)

4 0
3 years ago
2.0L of hydrogen gas is mixed with 3.0L of nitrogen gas at STP in a rigid 5.0L vessel. A reaction occurs, producing ammonia gas
IrinaK [193]

Answer:

Moles NH₃: 0.0593

0.104 moles of N₂ remain

Final pressure: 0.163atm

Explanation:

The reaction of nitrogen with hydrogen to produce ammonia is:

N₂ + 3 H₂ → 2 NH₃

Using PV = nRT, moles of N₂ and H₂ are:

N₂: 1atmₓ3.0L / 0.082atmL/molKₓ273K = 0.134 moles of N₂

H₂: 1atmₓ2.0L / 0.082atmL/molKₓ273K = 0.089 moles of H₂

The complete reaction of N₂ requires:

0.134 moles of N₂ × (3 moles H₂ / 1 mole N₂) = <em>0.402 moles H₂</em>

That means limiting reactant is H₂. And moles of NH₃ produced are:

0.089 moles of H₂ × (2 moles NH₃ / 3 mole H₂) = <em>0.0593 moles NH₃</em>

Moles of N₂ remain are:

0.134 moles of N₂ - (0.089 moles of H₂ × (1 moles N₂ / 3 mole H₂)) = <em>0.104 moles of N₂</em>

And final pressure is:

P = nRT / V

P = (0.104mol + 0.0593mol)×0.082atmL/molK×273K / 5.0L

<em>P = 0.163atm</em>

7 0
3 years ago
If you need to extract a 50 ml aqueous solution with 50 ml of dichloromethane, what is the minimum size of a separatory funnel y
tatuchka [14]

The dichloromethane (DCM) has less density than water and also the polarity of water is much more than DCM. So the mixture of water and dichloromethane will always be a heterogeneous mixture. In the mixture dichloromethane will be always up of the water layer. The volume of the separatory funnel which contains the mixture of DCM and water must have to be more than the total volume of the liquids thus the volume of the funnel will be more than (50+50) = 100mL.

The caution have to consider during the separation are-

1. The separatory funnel have to shake well with lid and have to settle down for some times until the two liquid separated.

2. The lid should be open very slowly as the vapor pressure of DCM is more and it will float on the water.

3. After this the stopcock should be opened and slowly the water will come out first followed by DCM.      

7 0
3 years ago
Please help me I really don’t understand
Leokris [45]
I dont understand life, for example, look at my username.

4 0
4 years ago
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