Alguém poderia me explicar como balancear uma equação

Two identical pots, one black and one silver, containing exactly the same amounts of water, are heated to the same temperature. They are left uncovered and placed in the same room.

When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. what volume of h2 is produced when 7.20 g of al reacts at stp?

An archer pulls back the string of a bow to release an arrow at the target which kind of potential energy is transformed to cause the motion of the arrow?

Which of the following statements best describes how Moseley's research affected the periodic table? It became organized by each element's name instead of its symbol. It became organized by atomic mass instead of atomic number.

The element chlorine has an atomic number of is 17. it will tend to

If a new substance is formed in a chemical reaction, what atoms do they consist of?

What is a scientific explanation for a range of hypotheses and observations supported by testing

A chemical reaction involves the rearrangement of atoms to form new molecules. During a chemical reaction, however, atoms are neither created nor destroyed. Which of the following is true about the atoms involved in a chemical reaction? A.

What is the new concentration, after diluting 300 mL of a 1.5 M LiCl solution to 1L

The answer that he gave was wrong