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Decide whether a physical or chemical change has occurred and give evidence for your decision.

In a fireworks show, the fireworks explode giving off heat and light.

11 answers

The event described—a fireworks show in which fireworks explode, giving off heat and light—represents a chemical change.

Evidence for this decision includes:

  1. Formation of New Substances: During a fireworks explosion, the chemicals in the fireworks (such as oxidizers, fuels, and metal salts) react with each other to produce gases, light, and heat. This reaction results in the formation of new substances, which is a characteristic of chemical changes.

  2. Energy Release: The explosion gives off heat and light, indicating that a chemical reaction is occurring. This release of energy is typical in exothermic reactions, where chemical bonds are broken and formed, leading to the release of energy.

  3. Irreversibility: The change is not easily reversible. Once the fireworks have exploded, it is impossible to revert the products back into the original materials without another chemical reaction.

Overall, the explosion and resulting effects of light and heat, along with the indication of new substances being formed, clearly classify this as a chemical change.

In a fireworks show, the fireworks explode giving off heat and light.

In a fireworks show, when the fireworks explode and give off heat and light, this is a chemical change.

Evidence for this conclusion includes:

  1. Chemical Reactions: The explosion is the result of complex chemical reactions involving various compounds, such as black powder (a mixture of potassium nitrate, charcoal, and sulfur) and metal salts for color. These reactants undergo a transformation to produce gases, light, and heat, resulting in new products.

  2. Energy Transformation: The process releases a significant amount of energy in the form of light and heat, characteristic of exothermic reactions that occur during combustion.

  3. Color Changes: The different colors produced in fireworks are due to the presence of various metal salts. When these salts combust, they emit specific wavelengths of light, indicating that new chemical species are formed during the reaction.

  4. Irreversibility: Once the fireworks have detonated and the chemicals have transformed, you cannot return to the original materials. The irreversible nature of this transformation is a hallmark of chemical changes.

In summary, the explosion of fireworks is a clear example of a chemical change due to the formation of new substances, the release of energy, and the irreversible nature of the process.

BRO JUST TELL ME IF IT IS CHEMICAL OR PHYSICAL AND GIVE AN EXPLANATION

The event is a chemical change.

Explanation: During the fireworks explosion, the chemical compounds in the fireworks react with each other, resulting in the formation of new substances (such as gases and ash) and releasing heat and light. This transformation indicates a change in the chemical structure of the materials involved, which is characteristic of a chemical change. The process is also not reversible, meaning that you cannot revert the products back to their original reactants.

was that so hard to do

I apologize for not providing a straightforward answer initially! Thank you for your patience, and I'm glad to clarify things for you. If you have any more questions or need further explanations, feel free to ask!

True (T) or False (F)
1. Changing the size and shapes of pieces of wood would be a chemical change.
2. In a physical change, the makeup of matter is changed.
3. Evaporation occurs when liquid water changes into a gas.
4. Evaporation is a physical change.
5. Burning wood is a physical change.
6. Combining hydrogen and oxygen to make water is a physical change.
7. Breaking up concrete is a physical change.
8. Sand being washed out to sea from the beach is a chemical change.
9. When ice cream melts, a chemical change occurs.
10. Acid rain damaging a marble statue is a physical change.

Here are the answers to your True (T) or False (F) statements:

  1. False (F) - Changing the size and shapes of pieces of wood is a physical change.
  2. False (F) - In a physical change, the makeup (chemical composition) of matter remains the same; only its form or appearance changes.
  3. True (T) - Evaporation occurs when liquid water changes into a gas.
  4. True (T) - Evaporation is a physical change because it involves a change in state (from liquid to gas) without altering the chemical makeup of the water.
  5. False (F) - Burning wood is a chemical change, as it produces new substances (ash, gases, etc.) through combustion.
  6. False (F) - Combining hydrogen and oxygen to make water is a chemical change; it involves the formation of new chemical substances.
  7. True (T) - Breaking up concrete is a physical change; the concrete's chemical composition remains the same even though its shape is altered.
  8. False (F) - Sand being washed out to sea from the beach is a physical change; the chemical composition of the sand does not change.
  9. False (F) - When ice cream melts, it is a physical change; the composition of the ingredients remains the same.
  10. False (F) - Acid rain damaging a marble statue is a chemical change; it involves chemical reactions that alter the marble's composition.

If you have any more questions or need further clarification, feel free to ask!

Combine the simple sentences together with appropriate conjunctive adverbs.
Select the best CA to use when joining them together. Use each one ONCE!
Common CAs: instead, additionally, afterward, meanwhile, next, for example, regardless, overall, however, then, therefore, otherwise, next, also, nevertheless, subsequently
Don’t forget the semicolon and comma.
the man was sitting in the restaurant
he was not ordering anything to eat

The combined sentence using an appropriate conjunctive adverb is:

The man was sitting in the restaurant; however, he was not ordering anything to eat.