Science Kids: All About Chemical Reactions

The video tutorial explores the differences between physical and chemical changes in matter, using examples like cookies and rust. It explains the components of chemical reactions, such as reactants and products, and how chemical bonds are involved. The tutorial also covers signs of chemical reactions, including color change, odor, and gas production. Energy changes in reactions are discussed, highlighting exothermic and endothermic processes. Finally, the law of conservation of matter is explained, emphasizing that matter is neither created nor destroyed in chemical reactions.

What is the study of matter and its changes called?

• Biology

• Physics

• Chemistry

• Psychology

Which of the following is NOT a physical property of matter?

• Texture

• Reactivity

• Color

• Flexibility

What must happen for a chemical reaction to occur?

• Substances must become more flexible

• Substances must change their physical state

• Substances must dissolve

• Substances must change into another substance

What are the substances called that start a chemical reaction?

• Products

• Catalysts

• Reactants

• Inhibitors

Which of the following is a sign that a chemical reaction has occurred?

• All of the above

• Production of a gas

• Emission of odor

• Change in color

What indicates that a gas has been produced during a chemical reaction?

• Light

• Rocks

• Bubbles

• Sound

What type of reaction releases energy to its surroundings?

• Cellular

• Endothermic

• Exothermic

• Biometric

During an endothermic reaction, what usually happens to the temperature?

• It increases

• It decreases

• It stabilizes

• It remains unchanged

What does the law of conservation of matter state?

• Matter is only created

• Matter is neither created nor destroyed

• Matter can be destroyed

• Matter can be created

Who first proposed the idea that the total amount of matter in the universe is constant?

• Ancient Greeks

• Ancient Romans

• Ancient Egyptians

• Ancient Chinese