Answer:
two electrons
Explanation:
Calcium atoms will lose two electrons in order to achieve the noble gas configuration of argon.
Answer:
Handpicking right?
It is a very simple and easy method of separation. It doesn't require any kind of equipment to proceed. It takes very less time when performed for small quantity of mixture. It doesn't require any kind of preparation
Answer: D. It is a base because it increases the concentration of hydroxide ions.
Explanation: A base is a substance which dissociates to give hydroxide ions in water.
An acid is a substance which dissociates to give hydrogen ions in water.
So 
is a base as it gives 
ions when dissolved in water.
Answer:
2672 kj
Explanation:
C4H10 O mole wt = 48 + 10 + 16 =~ 74 gm
27200 gm / 74 gm/mole = 367.57 moles
367.57 moles * 7.27 kj/mole =
Explanation:
Correct option is
D
3
The unbalanced chemical reaction is Al(s)+O
2
(g)→Al
2
O
3
(s)
Balance Al atoms by adding 2 to Al on LHS
2Al(s)+O
2
(g)→Al
2
O
3
(s)
Balance O atoms by adding
2
3
to O
2
on LHS
2Al(s)+
2
3
O
2
(g)→Al
2
O
3
(s)
Multiply the whole equation with 2.
4Al(s)+3O
2
(g)→2Al
2
O
3
(s)
This is the balanced chemical equation. The coefficient of O
2
is 3.
