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Brinell hardnesses, in MPa:
Ca: 167
Na: 0.69
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What metal reacts more vigorously than calcium?
sodium
Is diamond harder than a metal?
Yes, harder than any metal.
Which is more likely to form a cation between sodium and calcium?
Sodium is easier to form Na+ then Calcium forming Ca2+. The main reason is because Sodium has got 1 valence electron, which is more unstable than Calcium having 2 valence electrons. It requires less energy to remove one electron from Sodium than two electrons from Calcium. Therefore, Sodium is higher than Calcium in the reactivity series.
Does calcium have a lower first ionization energy level than sodium?
No. Calcium has TWO valence electrons, and Sodium has ONE. It is lot easier to take off one, than two you see. However, the second ionization energy of calcium IS however than the second ionization energy of Sodium. ;)
Why is calcium never used to make kitchen sinks?
Because calcium metal (element( will react with water and oxygen(air). Similar, but less vigorously, than sodium.
What metal reacts more vigorously than calcium?
sodium
How is sodium metal prepared?
Using Downs process, by the electrolysis of molten sodium chloride. This is done in a Downs Cell in which the NaCl is mixed with calcium chloride to lower the melting point below 700 °C. As calcium is less electropositive than sodium, no calcium will be deposited at the cathode. This method is less expensive than the previous Castner process of electrolyzing sodium hydroxide.
Is diamond harder than a metal?
Yes, harder than any metal.
Which is harder diamond or metal?
Diamond is harder than any metal.
Will a precipitate of Ca-OH-2 form when 320 ml of a 0.46 M solution of NaoH mixes with 400 ml of 0.85 M CaCl2 solution?
No, because calcium is a less reactive metal than sodium, therefore the calcium will not replace/displace the sodium from the sodium hydroxide. There will be no reaction.
Which is more likely to form a cation between sodium and calcium?
Sodium is easier to form Na+ then Calcium forming Ca2+. The main reason is because Sodium has got 1 valence electron, which is more unstable than Calcium having 2 valence electrons. It requires less energy to remove one electron from Sodium than two electrons from Calcium. Therefore, Sodium is higher than Calcium in the reactivity series.
How can plastic be harder than metal?
no
What is a form of calcium carbonate softer than marble but harder than chalk?
Limestone is softer than marble, but harder than chalk.
Does Cartilage harder than bone?
No. It does not have the amount of calcium as bone.
Does calcium have a lower first ionization energy level than sodium?
No. Calcium has TWO valence electrons, and Sodium has ONE. It is lot easier to take off one, than two you see. However, the second ionization energy of calcium IS however than the second ionization energy of Sodium. ;)
Why is calcium never used to make kitchen sinks?
Because calcium metal (element( will react with water and oxygen(air). Similar, but less vigorously, than sodium.
Which metal is less reactive than sodium but cannot be extracted heating with carbon in a furnace?
Several: Lithium, Barium, Strontium, Calcium, Magnesium, Aluminium and Titanium
