CHEMICAL REACTIONS

Substances disappear and other new ones appear.

• Physical transformation

• Chemical transformation

Is the process by which some substances (reactants), become new substances, called products

• Physical transformations

• Chemical reaction

• Chemical transformation

• Physical reaction

The energy needed to separate the atoms is lower thant the energy released when they join again

• Exhotermic

• Endothermic

The energy needed to separate the atoms is greater thant the energy released when they join again

• Exhotermic

• Endothermic

Substances that have a sour taste and react with limestones such as marble

• Neutral

• Alkaline

• Acid

• Base

Substances that have a bitter taste and soapy feel and do not usually atack metals

• Neutral

• Alkaline

• Acid

• Salt

We measure acidity-basicity with the .......... scale

What of these examples are NOT of REDOX

• Combustions

• Metal corrosions

• Batteries

• Precipitation

What is NOT another common reaction

• Descomposition

• Batteries

• Fermentation and respiration

• Precipitation

Wood, cotton, rock or clay are examples of nature origin

• TRUE

• FALSE