A student investigated the rate of the reaction between calcium and dilute hydrochloric acid.

The equation for the reaction is:

Ca_(s)+ 2HCl_(aq) → CaCl_2(aq) + H_2(g)

Which state symbol in the equation for the reaction does not represent one of the three states of matter?

In the electrolysis of sodium bromide dissolved in water, which of the following substances will be formed at the negative electrode?

potassium bromide  does not conduct electricity when solid because ions cannot move

Magnesium reacts very quickly with dilute acid, producing lots of bubbles of _________

When metal atoms lose electrons they form _______________ions

In a metal  displacement reaction  a less reactive metal takes the place of a more reactive metal

Doesbreaking bonds require energy, release energy, or not involve energy at all?

Solid magnesium dissolves in a hydrochloric acid, releasing hydrogen gas and heat from a solution of magnesium chloride. What is the sign for the energy change?

Which sentence about metal extraction is correct?