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3 years ago

Which group is more reactive than the alkaline earth metals?

Chemistry

2 answers:

SIZIF [17.4K]3 years ago

8 0

Answer: Alkaline metals(Group 1)

Explanation:

These elements react vigorously with cold water to give hydrogen gas and they have one electron in their outer-most shell which allows them to give electron freely and are good reducing agents.

examples of these elements are:

Hydrogen

Lithium

Sodium

Potassium

Rubidium

Hydrogen is the only gas in group 1.

Vlad [161]3 years ago

5 0

Answer: The alkali metals reactivity is generally higher than the alkaline earth metals.

Explanation: This makes the alkaline earth metals with their two valence electrons less reactive than alkali metals with their one valence electron.

Alkali metals is ns1 and alkaline earth metals is ns2

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For each of the processes, determine whether the entropy of the system is increasing or decreasing. The system is underlined.

defon

1. Increasing
2. Increasing
3. Decreasing
4. Increasing
5. Decreasing

6 0

3 years ago

Solid mixture contains MgCl2 and NaCl. When 0.5000 g of this solid is dissolved in enough water to form 1.000 L of solution, the

aksik [14]

Answer:

83,40 (w/w) %

Explanation:

The osmotic pressure (π) is defined as:

π = iMRT

Where i is Van't Hoff factor (3 for MgCl₂ and 2 for NaCl), M is molarity, R is gas contant (0,082atmL/molK) and T is temperature (298,15K)

iM = π / RT

iM = 0,01607mol/L

It is possible to write:

3x+2y = 0,01607mol/L (1)

Where x are moles of MgCl₂ and y moles of NaCl.

-M = moles of each compund because M is molarity (moles/L) and there is 1,000L-

Knowing molar mass of MgCl₂ is 95,2 g/mol and for NaCl is 58,44g/mol:

x×95,211 + y×58,44 = 0,5000g (2)

Replacing (2) in (1):

3x+2(0,0086 - 1,629x) = 0,01607mol/L

-0,258x = -0,00113

x = 0,004380 moles of MgCl₂

In grams:

0,004380 moles of MgCl₂×(95,211g/mol) = 0,417g of MgCl₂

Mass percent is:

(0,4170g of MgCl₂/0,5000g of solid) ×100 = 83,40 (w/w) %

I hope it helps!

4 0

3 years ago

List at least 15 important events in the science of Astronomy. Include a description of the event including the year and what cu

lbvjy [14]

The Big Bang probably occurred.
~30,000 B.C. North America Asian hunter-gatherers had crossed over the frozen Bering Strait to become first humans in North America.
~10,000 B.C. South America Those who crossed over on Bering Strait into North America had traveled as far south as Argentina by this point.
~6,000 B.C. Europe End of land bridge between Britain and continental Europe. Britain becomes an island.
~4,500 B.C. Brittany (France) The megalithic structures of Carnac were built.
~3,500 B.C. Wales Pentre Ifan is built.
~3,200 B.C. Ireland The Newgrange tomb is built.

7 0

3 years ago

Read 2 more answers

Consider the hypothetical reaction 4A + 3B → C + 2D Over an interval of 3.00 s the average rate of change of the concentration o

pogonyaev

Answer:

Final concentration of C at the end of the interval of 3s if its initial concentration was 3.0 M, is 3.06 M and if the initial concentration was 3.960 M, the concentration at the end of the interval is 4.02 M

Explanation:

4A + 3B ------> C + 2D

In the 3s interval, the rate of change of the reactant A is given as -0.08 M/s

The amount of A that has reacted at the end of 3 seconds will be

0.08 × 3 = 0.24 M

Assuming the volume of reacting vessel is constant, we can use number of moles and concentration in mol/L interchangeably in the stoichiometric balance.

From the chemical reaction,

4 moles of A gives 1 mole of C

0.24 M of reacted A will form (0.24 × 1)/4 M of C

Amount of C formed at the end of the 3s interval = 0.06 M

If the initial concentration of C was 3 M, the new concentration of C would be (3 + 0.06) = 3.06 M.

If the initial concentration of C was 3.96 M, the new concentration of C would be (3.96 + 0.06) = 4.02 M

3 0

3 years ago

What kind of questions do scientists ask?

Usimov [2.4K]

ones that are answered through observing :)

7 0

3 years ago