4.1 Reactants And Products Lesson Quiz

The reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is a neutralization reaction. In a neutralization reaction, an acid reacts with a base to form salt and water. In this case, the salt produced is sodium chloride (NaCl), and water (H2O) is also produced. The reaction also releases heat. Carbon dioxide (CO2) is not a product of this reaction.

The products in this equation are sodium nitrate and lead iodide.

The correct answer is that the atoms of the reactants have recombined to form the products. In a chemical reaction, the atoms of the reactants rearrange their bonds to form new substances, which are the products. The reaction between lead nitrate and sodium iodide results in the formation of sodium nitrate and lead iodide. This means that the atoms from the reactants have combined in different ways to create the products.

When vinegar is added to baking soda, a chemical reaction occurs. Baking soda is a base, and vinegar is an acid. When they combine, they undergo a reaction called neutralization. One of the products of this reaction is carbon dioxide gas, which rapidly forms and creates bubbles. The other product is a cloudy liquid, which is a result of the reaction between the acid and base. Therefore, the correct answer is carbon dioxide and the cloudy liquid.

The correct answer is C. a color change occurred. This is because the reaction between lead nitrate and sodium iodide produces lead iodide, which is a bright yellow solid. The change in color indicates that a chemical change has taken place.

In a chemical reaction, the number and kind of atoms involved as reactants are equal to the number and kind of atoms in the products. This is known as the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. Therefore, the total number of atoms before the reaction must be equal to the total number of atoms after the reaction.