Answer:
A- Ca
B- Ca(OH)2
C-CaCO3
D- CaO
Explanation:
Element A is calcium. Calcium reacts with water to form calcium hydroxide (compound B) as follows; Ca(s) + 2H2O(l) ----> Ca(OH)2(s) + H2(g).
When exposed to air, calcium hydroxide (compound B) forms calcium trioxocarbonate IV (CaCO3) which is compound C as follows;
Ca(OH)2(s) + CO2(g) -----> CaCO3(s) + H2O(l)
On heating compound C, the oxide, CaO (D) is formed as follows;
CaCO3(s) ------> CaO(s) + CO2(g)
This oxide reacts with water to yield B again as follows;
CaO(s) + H2O(l) ----> Ca(OH)2(s)
Baking a cake is a chemical reaction due to heat helps baking powder produce tiny bubbles of gas, which makes the cake light and fluffy. Heat also causes protein from an egg to change and make it firm.
Baking powder being CO2
NaHCO3 + NaHC4H4O4 ===> Na2C4H4O4 + CO2(g) + H2O
Answer: molar mass of H2O2 = 34 g/mol
mass of H2O2 = 68 grams
Explanation:
The decomposition reaction of Hydrogen peroxide (H2O2) is:
2 H2O2 → 2 H2O + O
According to the equation the numbers of moles of H2O2 is 2 moles.
The molar mass of H2O2 = ( 16×2) + (1x2)
32 + 2 = 34 g/mol
∵ atomic mass of oxygen is 16 and hydrogen is 1.
Now, mole=
putting values
2=
mass of H2O2 = 2 × 34 = 68 grams
Answer: 5.844 grams of NaCl needed to make solution.
Explanation:
