Answer: B. It’s a dilute strong base.
Explanation:
1) Definition of acids and bases: as per Bronsted-Lowry model, an acid is a substance that donates hydrogen ions and a base is a substance that accepts hydrogen ions.
Ca(OH)₂ does not have hydrogen ions to donate, but it can accept hydrogen ions to form H₂O according to this equation: H⁺ + OH⁻ → H₂O.
Hence, Ca(OH)₂ is a base.
2) Definition of strong base: a strong base is a base that dissociates completely into metallic and hydroxide ions in aqueous solutions, while a weak base dissociates partially.
Hence, Ca(OH)₂ is a strong base.
3) Definition of dilute: it refers to a solution meaning that the substance is not pure and the concentration is low. Since, the solution the Ca(OH)₂ is 0.02 M means that it is dilute.
Therefore, we have found that the description of 0.02 M Ca(OH)₂ is that is is a dilute strong base (option B).
Answer:
cylinder A has a higher density then cylinder B or more accurately the liquid in cylinder A is denser then the liquid in the second tube.
Explanation:
"Denser" simply means more matter is contained in the same space for example say you fill a tank with helium and another tank with water. Although they are the same size one will weigh much more because their is more particles or "stuff" inside the same area this can be because of a few things one it can be because the atoms or elements that compose the substance are heavier containing more electrons and protons in their orbit. or the molecular structure is more compact like a chicken wire fence has more wire in it then a barbed wire wire fence covering the same area because of the grid of wire in the middle.
Answer:
Born-Haber Process - "Born-Haber process applies Hess's law to calculate the lattice enthalpy(<em>this is a thermodynamic term which equals to the total heat content of a system</em>), by comparing the standard enthalpy change of formation of ionic compound (from the elements) to the enthalpy required to make gaseous ions from the elements".
Explanation:
Now the calculations done for SRI2 are as follows:
- Enthalpy of Sublimation of Sr(s)= 164 kJ per mol,
- 1st ionization energy of Sr(g)=549 kJ per mol,
- 2nd ionization energy of Sr(g)=1064 kJ per mol,
- Enthalpy dissociation energy of I2(s)= 62.4 kJ per mol,
- Bond dissociation energy of I2(g)= 152.55 kJ per mol,
- 1st electron affinity of I(g)= -295.15 kJ per mol,
- Lattice energy of SrI2(s)=-1959.75 kJ per mol.
Note - the terms mentioned in the brackets are as, S- solid form, g- Gaseous form.
Ionic equation denotes to balance of all charges ,electrons , Hydrogens and oxygen and all atoms + oxidation nos.
Whereas balanced equation only locates balancing of atoms not anything else.
Remember that.. ionic equation depends upon acidic or basic medium
Number of moles of solute in 1L of solution is called molarity.
Molarity=number of moles of solute/volume in L.
i hope this helps u....ny doubts are welcome