Answer:
A solid residue of limestone and some gypsum.
Explanation:
In step 2, some of the limestone and gypsum in the chalk dissolve in the water. When the mixture is filtered, the dissolved substances remain in the water. When the water is boiled off or evaporated, the solid substances remain behind.
Answer:
25002m
Explanation:
V = 100 km/h
Converting to m/s, we have
V = (100 x 1000)/3600 = 27.78m/s
t = 15mins = 15 x 60 = 900secs
Displacement =?
Velocity = Displacement /Time
Displacement = Velocity x time
Displacement = 27.78 x 900
Displacement = 25002m
Since displacement and distance are measured in same unit, the distance between A and B is 25002m
Answer:
Al2O3
Explanation:
Al2O3 has an ionic bond because the bonds between them are very strong
Explanation:
The chemical reaction equation will be as follows.
As 1 mole 
reacts with 1 mole of 
Hence, moles of = Molarity × Volume (in mL)
= 0.5 × 38.0 mL
= 0.019 mol
Moles of = Molarity × Volume (in mL)
= 0.6 × 42.0 mL
= 0.0252 mol
As moles of CuS is less than the moles of . This means that CuS is the limiting reagent.
Thus, maximum moles of CuS formed are 0.019 mol. As molar mass of CuS is 95.6 g/mol.
Therefore, maximum mass of CuS can be formed is 
= 1.8164 g
Thus, we can conclude that maximum mass of CuS formed is 1.8164 g.
