Answer: D
A catalyst is a substance that alters the reaction and doesn't involve in the reaction.So if the Manganese was a catalyst the mass would not have decreased,it would just continue aletring the reaction until its used up.
The Manganese is not acting as a catalyst
The United States Indian Industrial School in Carlisle, Pennsylvania, generally known as Carlisle Indian Industrial School, was the flagship Indian boarding school in the United States from 1879 through 1918.
Answer:
The Progressive Era saw many far-reaching reform movements whose goals included eliminating government corruption, granting suffrage for women, and passing antitrust legislation. Despite these successes, the benefits of Progressivism were mostly limited to white Americans.
Answer:
b. Congress refused to recognize Labor Day as a federal holiday.
Explanation:
US President Grover Cleveland established Labor Day in September as an official holiday in the US, following the celebration of the Knights of Labor and to prevent May 1 from serving as a glorification of the "Chicago martyrs"
In U.S.A. they celebrated radical trade unionists, members of the workers' socialist party and the communist party on May 1st, identified as part of the international left "
