True or false elements in the same colum have simular properties

When a ball is rolling down a hill, what forces are acting on the ball? Why does it speed up?

Margaret [11]

Answer:gravity

Explanation:

3 0

3 years ago

Read 2 more answers

Identify the element: 6 energy level, metallic, 82 election

Lady bird [3.3K]

Answer:-

Name of element = Lead

Symbol ♾ of Lead = Pb

Atomic no. = 82

Atomic mass = 207.2 amu

No. of protons = 82

No. of electrons = 82

Yes, lead(Pb) is a metallic element and certainly it has 6 electron shells which means 6 energy level.

If you find anything unclear you can ask me...

6 0

3 years ago

How many grams of material is lost in the aqueous phase if two extractions are carried out on 100 mL of a 5% (m/v) aqueous solut

san4es73 [151]

Answer:

4.94g of material

Explanation:

Partition coefficient (Kp) of a substance is defined as the ratio between concentration of organic solution and aqueous solution, that is:

Kp = 8 = Concentration in Ethyl acetate / Concentration in water

100mL of a 5% solution contains 5g of material in 100mL of water. Thus:

8 = X / 100mL / (5g-X) / 100mL

Where X is the amount of material in grams that comes to the organic phase.

8 = X / 100mL / (5g-X) / 100mL

8 = 100X / (500-100X)

4000 - 800X = 100X

4000 = 900X

4.44g = X

Thus, in the first extraction you will lost 4.44g of material from the aqueous phase.

And will remain 5g-4.44g = 0.56g.

In the second extraction:

8 = X / 100mL / (0.56g-X) / 100mL

8 = 100X / (56-100X)

448 - 800X = 100X

448 = 900X

0.50g = X

In the second extraction, you will extract 0.50g of material

Thus, after the two extraction you will lost:

4.44g + 0.50g = 4.94g of material

6 0

2 years ago

when 1.00 l 1.00 l of a 0.500 m l i b r 0.500 m libr solution is tripled by dilution with water, what is the number of moles of

Murrr4er [49]

When 1.00 L of a 0.500 M LiBr solution is tripled by dilution with water . the number of moles of lithium in new solution is 0.5 moles.

given that :

volume = 1.00 L

molarity = 0.500 M

The solution is tripled by dilution but there will be no effect in number of mole by the dilution.

the number of moles = molarity × volume in L

the number of moles = 1 × 0.500

the number of moles = 0.5 mol

Thus, When 1.00 L of a 0.500 M LiBr solution is tripled by dilution with water . the number of moles of lithium in new solution is 0.5 moles.

To learn more about number of moles here

brainly.com/question/14919968

#SPJ4

7 0

1 year ago

How many moles of ammonium nitrate will be produced 110.0g of ammonium carbonate

marshall27 [118]

Answer:

2.288 Moles of NH₄NO₃

Explanation:

The Balance chemical equation is as follow:

(NH₄)₂CO₃ + 2 HNO₃ → 2 NH₄NO₃ + H₂O + CO₂

To solve this problem we will do following steps:

Finding moles of Ammonium Carbonate:

As we know,

Moles = Mass / M.Mass

So,

Moles = 110 g / 96.08 g/mol

Moles = 1.144 moles

Calculating moles of Ammonium Nitrate:

According to balance chemical equation;

1 mole of (NH₄)₂CO₃ produces = 2 moles of NH₄NO₃

So,

1.144 moles of (NH₄)₂CO₃ will produce = X moles of NH₄NO₃

Solving for X,

X = 2 moles × 1.144 moles ÷ 1 mole

X = 2.288 moles of NH₄NO₃

8 0

3 years ago