Answer:
Ca, Zn, Ni, Al, Fe
Explanation:
The activity series is an arrangement of metals in order of decreasing reactivity.
Metals that are high up in the activity series are very reactive. They displace metals that are lower in the activity series from an aqueous solution of their salts.
The metals; Ca, Zn, Ni, Al, Fe are all above Pb in the activity series hence they will cause Pb2+ ions to come out of solution as solid Pb.
Calcium carbonate also is used as an antacid to relieve heartburn, acid indigestion, and upset stomach. It is available with or without a prescription. This medication is sometimes prescribed for other uses. Hope this is the right answer your looking for
The answer is B. Forming bonds requires energy and breaking bonds releases energy. The transition state is the highest point in one reaction energy profile. Before the transition state, the energy increases which means transition state absorbs energy.
Answer:
Upward delivery or downward displacement of air
Explanation:
The method of collection of a gas is dependent on it's density.
Gases that are less dense than air are collected by upward delivery or downward displacement of air while gases that are denser than air are collected by downward delivery or upward displacement of air.
Hydrogen is less dense than air hence it is collected by upward delivery or downward displacement of air.
Answer: 8.702g of HCl
Explanation:
Using the details from the equation;
4HCl(aq) + MnO2(s) → 2H2O(l) + MnCl2(aq) + Cl2(g)
The molecular mass of HCl is; 4 (1 + 35.5) = 146g
The molecular mass of MnO2 is; (54.9 + 32) = 86.9g
From the equation it means;
86.9g of MnO2 reacts with 146g of HCl
if 1 g of MnO2 reacts with 146 ÷ 86.9 of HCl
∴ 5.18g of MnO2 will react with; 146 ÷ 86.9 x 5.18 = 8.702g of HCl
Note: Approximations were made during the determination of the molecular masses.
