In a chemical reaction, what is a reactant?
A chemical reaction is when two or more chemicals mix and create a new substance with different properties. Reactions can be exothermic, releasing energy, or endothermic, absorbing energy. Chemical reactions can be used to create new materials, drugs, and fuels.
Reactant: A substance or molecule that participates in a chemical reaction. Product: A substance produced by or resulting from a chemical reaction. Chemical Equation: A symbolic representation of a chemical reaction which indicates the reactants and products, the direction of the reaction and the amount of each reactant used and each product formed.
The coldest chemical reaction ever recorded was -273°C, just a few degrees above absolute zero. Chemical reactions can be used to make glow in the dark paint. The world's most powerful chemical reaction was the detonation of the first atomic bomb in 1945.
Did you know?
What are the types of chemical reactions and how do they differ from each other?
What is the role of catalysts in chemical reactions and how do they affect the rate of the reaction?
What have you learned about chemical reactions so far?
What questions do you still have about chemical reactions?
Brain break: Draw a banana rocket launching into space with a strawberry piloting it.
Question: An experiment was conducted to investigate a chemical reaction. What were the results of the experiment? Clues: • The experiment involved mixing two substances. • The substances were heated to activate the reaction. • The reaction was observed for 30 minutes. In pairs: Select and solve one of the tasks: A. Work in pairs to draw a diagram of the experiment. B. Describe the results of the experiment in your own words.
What is a chemical reaction?
- The process by which compounds are broken down into simpler substances
- The process by which atoms are rearranged to form new substances
- The process by which elements combine to form mixtures
What is the law of conservation of mass?
- Energy cannot be created or destroyed in a chemical reaction
- Both matter and energy can be created or destroyed in a chemical reaction
- Matter cannot be created or destroyed in a chemical reaction
What is an endothermic reaction?
- A reaction that releases heat to the environment
- A reaction that absorbs heat from the environment
- A reaction that maintains constant temperature in the environment
Which type of reactions occur when two or more reactants combine to form one product?
- Single-replacement reactions
- Synthesis reactions
- Decomposition reactions
Which type of reactions occur when one element replaces another element in a compound, producing a new compound and a different element as products?
- Redox (reduction-oxidation) reactions
- Double-replacement reactions
- Combustion reactions
Work together in pairs: What are the three main components of a chemical reaction?