Química Reto 4

What is a chemical reaction?

• A chemical reaction is a process in which one or more substances are converted into different substances with different properties.

• A chemical reaction is a process in which substances are converted into different substances with opposite properties.

• A chemical reaction is a process in which substances are converted into different substances with the same properties.

• A chemical reaction is a process in which substances remain the same and do not change properties.

Explain the difference between exothermic and endothermic reactions.

• Exothermic reactions release heat energy to the surroundings, while endothermic reactions absorb heat energy from the surroundings.

• Exothermic reactions and endothermic reactions have no difference

• Endothermic reactions release heat energy to the surroundings

• Exothermic reactions absorb heat energy from the surroundings

What is the atomic structure of an atom?

• Nucleus containing electrons and neutrons, surrounded by protons

• Nucleus containing protons and electrons, surrounded by neutrons

• Nucleus containing protons and neutrons, surrounded by electrons

• Nucleus containing neutrons and electrons, surrounded by protons

Describe the organization of the periodic table.

• The periodic table is organized by the number of protons and grouped by their melting point.

• The periodic table is organized by increasing atomic number and grouped by similar chemical properties.

• The periodic table is organized by the size of the atoms and grouped by their color.

• The periodic table is organized by the atomic weight and grouped by their location on Earth.

What are the properties of acids?

• Acids have a bitter taste and turn blue litmus paper green

• Acids have a sweet taste and turn red litmus paper blue

• Acids have no taste and do not react with litmus paper

• Acids have a sour taste, turn blue litmus paper red, and react with metals to produce hydrogen gas.

What are the properties of bases?

• Bases have a bitter taste, feel slippery, and turn red litmus paper blue.

• Bases have a salty taste, feel smooth, and turn blue litmus paper yellow.

• Bases have a sour taste, feel slimy, and turn red litmus paper green.

• Bases have a sweet taste, feel rough, and turn blue litmus paper red.

Balance the chemical equation: H2 + O2 → H2O

• H2 + O2 → H2O2

• 2H2O → H2 + O2

• H2 + O2 → 2H2O

• H2O2 → H2 + O2

What is the chemical formula for sulfuric acid?

• H2O

• SO3

• H2SO4

• NaCl

What is the pH scale and how is it used to measure acidity and basicity?

• The pH scale is used to measure the acidity and basicity of a solution by indicating the concentration of hydrogen ions (H+) in the solution.

• The pH scale measures the concentration of oxygen ions in a solution

• The pH scale measures the color of a solution

• The pH scale measures the temperature of a solution

What is the law of conservation of mass in chemical equations?

• Mass is not conserved in chemical reactions

• The law of conservation of mass only applies to solid substances

• Matter is neither created nor destroyed

• Matter can be created and destroyed