10 Questions
What are the two reactants in cellular respiration?
Sugar and oxygen gas
Which of the following is a sign that a chemical reaction has occurred?
Formation of bubbles
What is the product of the reaction between glucose and oxygen gas in cellular respiration?
Carbon dioxide and water
Which substance is considered non-toxic and non-reactive?
Sodium chloride
What is a solid precipitate in a chemical reaction?
A solid particle that sinks to the bottom of a liquid solution
What is the main difference between the properties of the reactants and products in a chemical reaction?
There is little relationship between the properties of reactants and products
What determines whether a chemical reaction has occurred?
Change in temperature
Which sign indicates that a gas is being produced during a chemical reaction?
Formation of bubbles
What are solid precipitates in chemistry?
Solids formed during a reaction
What makes table salt (sodium chloride) non-toxic for humans?
Its stable, non-reactive nature
Study Notes
Chemical Reactions
- A chemical reaction is a process where the arrangement of atoms is changed, converting reactants into products.
- Reactants are the starting materials, and products are the chemicals produced by the reaction.
- Chemical reactions are represented by an arrow (→) with reactants on the left and products on the right.
Reactants and Products
- Reactants are the ingredients or starting materials of a chemical reaction.
- Products are the result of a chemical reaction, what comes out of the reaction.
- A good analogy for a chemical reaction is baking a cake, where the ingredients are the reactants, and the cake is the product.
Examples of Chemical Reactions
- Na + Cl → NaCl (sodium and chlorine react to form table salt)
- 2H2O → 2H2 + O2 (water breaks down into hydrogen gas and oxygen gas)
- C6H12O6 + 6O2 → 6CO2 + 6H2O (cellular respiration reaction)
What Happens to Atoms after a Chemical Change?
- Atoms are not altered by a chemical reaction, but their arrangement is changed.
- The total number of atoms remains the same before and after a chemical reaction.
- The types and numbers of atoms on both sides of the chemical reaction equation do not change.
Signs of a Chemical Reaction
- A change in color
- A change in temperature
- A gas being produced (e.g. bubbles forming)
- A solid being produced (most often a precipitate)
Test your knowledge on identifying products in chemical reactions. Learn about the process of how reactants are converted into products during a chemical reaction. Understand the significance of the arrangement of atoms in changing the chemical composition.
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