Which of these processes indicates that smelting copper is a chemical change? it involves melting copper to form liquid metal. it involves heating charcoal to high temperatures. it involves drawing copper into long wires. it involves breaking molecular bonds between copper compounds.

It involves breaking molecular bonds between copper compounds.

Explanation: A physical reaction is defined as the reaction in which a change in shape, size takes place. No new substance gets formed in these reactions.

Example: melting copper, heating to high temperatures, drawing into wires

A chemical reaction is defined as the reaction in which a change in chemical composition takes place. A new substance is formed in these reactions.

Smelting is the process where metal is extracted from its ore by heating and melting. Smelting uses heat and a chemical reducing agent to decompose the ore, thus involves changes in molecular bonds and thus is chemical change.

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year