4.00g
4.44 g
18.9 g
27.8 g
Correct answer is D
CaCO\(_3\) + 2HCI → CaCI\(_2\) + H\(_2\)O + CO\(_2\)
100g CaCO\(_3\) will produce 111g CaCI\(_2\)
25g CaCO\(_3\) will produce x ,
x = \(\frac{25 x 111}{100}\)
= 27.75 \(\approxeq\) 27.8g
MgO does not readily dissolve in water because
of its high melting point
it is a covalent compound
it forms a hydroxide when dissolved in water
its lattice energy is higher than its hydration energy
Correct answer is D
No explanation has been provided for this answer.
l only
l and ll only
l and lll only
ll and lll only
Correct answer is C
Three common factors that influence the vapor pressure of a liquid are the surface area, intermolecular forces and the temperature.
The complex compound formed when aluminum dissolves in aqueous sodium hydroxide is
Na3Al(OH)4.
NaAl(OH)4
NaAl(OH)3
Na2Al(OH)3
Correct answer is B
When aluminium is treated with dilute sodium hydroxide it forms a salt called sodium tetrahydroxoaluminate and hydrogen gas.
polar covalent
giant molecular
covalent
ionic
Correct answer is D
Ionic bonds are also formed when there is a large electronegativity difference between two atoms.