In a considerable number of chemical reactions no new

substances appear.

The vaporization of water is a chemical change, because a

new substance appears.

Complete the sentence with the correct option: «When a chemical reaction takes place a new substance appears because…

Indicate what the reactants are in this chemical reaction:

Aluminium is combined with hydrochloric acid and aluminum trichloride and hydrogen is released.

Indicate what the products are in this chemical reaction:

Aluminium is combined with hydrochloric acid and aluminum trichloride and hydrogen is released.

Indicate which chemical equation corresponds to this reaction: Magnesium (Mg) is combined with hydrochloric acid (HCl) and magnesium dichloride is formed (MgCl₂) and hydrogen (H₂) is released.

Solve the following exercise using the law of conservation of matter: 36.5 g of hydrochloric acid (HCl) reacts with 40 g of sodium hydroxide (NaOH) resulting in 58.5 g of sodium chloride (NaCl) causing a certain amount of water (H₂O) to be formed. Choose the option that represents the amount of water formed:

Solve the following exercise using the law of conservation of matter: When 6 g of hydrogen reacts with 30 g of nitrogen, there are 2 g of nitrogen left over that do not react. Knowing that ammonia is the only product of the reaction, what mass is obtained?

Out of the following factors, which ones influence the speed of a chemical reaction?:

What the name of the chemical substance that allows milk's plot?

In the production of cheese, what are the reactans?

Substances such as nitrogen oxides and compounds known as CFC (which include chlorine) in the atmosphere cause chemical reactions that trigger this phenomena

One of the main gases responsible for this effect in carbon dioxide. As the use of fossil fuels has increased the amount of this gas in the atmosphere over the las two centuries, the atmosphere is retaining undesired excess energy.

Is the phenomenon of rainwater carrying very corrosive acids...