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Questions and Answers
What is a key difference between chemical changes and physical changes?
What is a key difference between chemical changes and physical changes?
- Chemical changes are temporary, while physical changes are permanent.
- Physical changes affect the chemical composition, while chemical changes do not.
- Physical changes produce a new substance, while chemical changes do not.
- Chemical changes are reversible, while physical changes are irreversible. (correct)
Which of the following is NOT a key signal to recognize a chemical reaction?
Which of the following is NOT a key signal to recognize a chemical reaction?
- Gas or bubbles produced
- Reversibility of the change (correct)
- Formation of a precipitate in the mixing of two liquids
- A color change occurs
What is the primary outcome of a chemical reaction?
What is the primary outcome of a chemical reaction?
- Causing a temporary effect
- Creating a new substance (correct)
- Only affecting physical properties
- Producing a reversible change
In which environment can chemical reactions occur?
In which environment can chemical reactions occur?
What is the main product of a combustion reaction involving hydrocarbons burning in the presence of oxygen?
What is the main product of a combustion reaction involving hydrocarbons burning in the presence of oxygen?
What is the function of stomach acid in the process of digestion?
What is the function of stomach acid in the process of digestion?
What is the term for the process when a metal combines with oxygen and water in the atmosphere?
What is the term for the process when a metal combines with oxygen and water in the atmosphere?
Which chemical reaction is responsible for plants turning sunlight into energy?
Which chemical reaction is responsible for plants turning sunlight into energy?
What type of reaction occurs in batteries due to the process of electrolysis?
What type of reaction occurs in batteries due to the process of electrolysis?
What is the main difference between a chemical change and a physical change?
What is the main difference between a chemical change and a physical change?
Which of the following is NOT a signal to recognize a chemical reaction?
Which of the following is NOT a signal to recognize a chemical reaction?
In which of the following types of reactions does a color change occur as a signal?
In which of the following types of reactions does a color change occur as a signal?
What does the formation of gas or bubbles indicate in a chemical reaction?
What does the formation of gas or bubbles indicate in a chemical reaction?
Why is it important to be able to think beyond the stereotype that chemical reactions only occur in labs?
Why is it important to be able to think beyond the stereotype that chemical reactions only occur in labs?
What is the primary purpose of combustion reactions?
What is the primary purpose of combustion reactions?
Which of the following is an example of oxidation?
Which of the following is an example of oxidation?
What happens during electrolysis reactions?
What happens during electrolysis reactions?
Which chemical reaction is responsible for turning nutrients into usable energy for the human body?
Which chemical reaction is responsible for turning nutrients into usable energy for the human body?
What is the main product of photosynthesis in plants?
What is the main product of photosynthesis in plants?
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