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White raven [17]
3 years ago
7

How is the modern periodic table arranged?

Chemistry
2 answers:
tigry1 [53]3 years ago
3 0
Modern periodic table is arranged on the basis of element's increasing "Atomic numbers"

Hope this helps!
Leokris [45]3 years ago
3 0

Answer:

by atomic number, with chemical families or groups in columns and periods in rows

Explanation:

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Gasoline is primarily a mixture of hydrocarbons and is sold with an octane rating that is based on a comparison with the combust
velikii [3]

Answer:

Answers:

Option B

Option A.

Explanation:

For part A

The applicable equation is the Clausius-Clapeyron equation. The equation relates the vapor pressure and temperature like this:

ln(\frac{P_{2} }{P_{1} }  = \frac{\deltaH_{vap}  }{R} * (\frac{1}{T_{2} } - \frac{1}{T_{1}) }

We know that P₁ = 6.63 torr

R = 8.314 kj/mol

T₁ = 106.5⁰ = 379.65 K

T₂ = 38⁰ = 311.15 K

ΔH = 43 300J/mol

using the equation to solve for P₂, we get 67.8 torr

For part B

Water is a polar molecule. The bonds in the water are hydrogen bonds; water forms strong hydrogen bonds between the molecules. However, the gases in the air are non polar. Nitrogen and argon are inert gases - nonreactive. Nitrogen has a triple bond N≡N and argon is inert. Oxygen is a bi-atomic gas, O₂.

Hence the only forces in the water with the gases are  dipole-induced dipole forces.

3 0
4 years ago
32. Calculate the pH of a solution at 1.00 x 10- MIH") and identify the substance as an acid or base,
Gre4nikov [31]

Answer:

{ \boxed{ \tt{formular : pH =  -  log[H {}^{ + } ]}}} \\ pH =  -  log(1.00 \times  {10}^{-6} ) = 6: it's an acid\\ since \: we \: lack \: the \: exponent, \: this \: question \: is \: unsolvable \\ { \green{ \bf{take \: note}}} :{ \tt{pH \: below \: 7 \: that \: is \: { \red{acidic}}.  \:  \:  pH \: greater \: than \: 7 \: is \: { \red {basic}}}}

8 0
3 years ago
How many liters of the antifreeze ethylene glycol [CH2(OH)CH2(OH)] would you add to a car radiator containing 6.50 L of water if
sergeinik [125]
 <span>16 = m x 1.86 
m = 8.60 = moles solute / 6.50 Kg 

moles solute = 55.9 

mass solute = 55.9 x 62.068 g/mol=3470 g 

V = 3479/ 1.11 =3126 mL= 3.13 L 

delta T = 8.60 x 0.512 =4.40 
boling point = 104.4 °C

Hope this helps.</span>
4 0
3 years ago
Read 2 more answers
A sample of silver contains 5.71x10^22 atoms. how many moles of silver are present ​
Nitella [24]

N=n×Nav

n=N / Nav

(5.71×10^22) / (6.02×10^23)

n=0.09mol

3 0
3 years ago
Check the statements that are accurate. Check all of the boxes that apply. Before Thomson’s experiments, scientists accepted tha
elixir [45]
Answer 1) It is incorrect.

Explanation : For the statement; 

Thomson did experiments with cathode ray tubes  to show that all atoms contain tiny negatively charged subatomic particles called as electrons<span>.

So the statement should be like this:
AFTER the </span><span>Thomson’s experiments, scientists accepted that the atom was made up of smaller particles.

Answer 2) This is correct.

Explanation : Rutherford was the scientist who discovered that atoms has volume is because of the empty spaces inside it. He did the gold foil experiments to prove this and he was successful in doing this by concluding that tiny dense empty places are occupied by positively charged nucleus.

Answer 3) This is Correct.

Explanation : After Thomson and Rutherford, Millikan also performed an experiment to prove that an atom contains a small positively charged nucleus which is usually surrounded by negatively charged electrons by his oil drop experiment.</span>
5 0
4 years ago
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