Understanding Physical and Chemical Changes

Mr. Anderson discusses the differences between physical and chemical changes, providing examples and explanations for each. He explains how physical changes affect appearance without altering the substance, while chemical changes result in new substances. The video covers indicators of chemical changes, such as bubbles, temperature changes, and color changes. It concludes with a discussion on chemical reactions and balancing equations.

What type of change occurs when water boils?

• Both chemical and physical change

• Neither chemical nor physical change

• Chemical change

• Physical change

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

• Burning wood

• Rusting iron

• Melting ice

• Baking a cake

What indicates a chemical change has occurred?

• Change in shape

• Change in color

• Change in size

• Change in texture

Which process is an example of a chemical change?

• Melting butter

• Mixing vinegar and baking soda

• Boiling water

• Dissolving sugar in tea

What is a sign of a chemical reaction occurring in fireworks?

• The sound they make

• The colors they produce

• The shape they form

• The size they explode to

What is bioluminescence an example of?

• Neither physical nor chemical change

• Both physical and chemical change

• Chemical change

• Physical change

What happens to the reactants in a chemical reaction?

• They remain unchanged

• They yield new substances

• They disappear

• They become larger

In a balanced chemical equation, what must be equal on both sides?

• The number of atoms

• The number of elements

• The number of molecules

• The number of compounds

What does the arrow in a chemical equation represent?

• Equals

• Minus

• Yields

• Plus

Why can't subscripts in a chemical formula be changed?

• It would change the compound

• It would make the equation unbalanced

• It would create new elements

• It would break the atoms