PS1B - Chemical Reactions

Paul Anderson explains chemical reactions, emphasizing their importance and the concept of conservation of mass. He introduces collision theory and discusses how temperature and concentration affect reactions. The video provides teaching strategies for different educational levels, from elementary to high school, and includes practical experiments and simulations to demonstrate key concepts.

What is a key characteristic of a chemical reaction?

• Atoms are created and destroyed.

• Atoms are rearranged and bonds are broken and re-formed.

• Energy is always absorbed.

• Molecules are only physically mixed.

Which example illustrates the conservation of mass during a chemical reaction?

• Melting ice into water.

• Boiling water into steam.

• Mixing hydrogen and oxygen to form water.

• Dissolving sugar in water.

According to collision theory, what can increase the rate of a chemical reaction?

• Decreasing the temperature.

• Increasing the concentration of reactants.

• Reducing the number of reactants.

• Decreasing the pressure.

What happens to molecular motion when temperature is increased?

• Molecular motion increases.

• Molecular motion decreases.

• Molecular motion remains constant.

• Molecular motion stops.

Which of the following is an example of a reversible change?

• Rusting iron.

• Burning wood.

• Baking a cake.

• Boiling water.

What is a common experiment to demonstrate conservation of mass in elementary education?

• Freezing water.

• Melting chocolate.

• Combining vinegar and baking soda.

• Mixing oil and water.

In high school chemistry, what simulation can help students understand reaction rates?

• A weather forecast.

• phet.colorado.edu simulation.

• A video game.

• A cooking show.