Types Of Chemical Reactions Answers

7.two: Evidence of a Chemical Reaction

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⚙️Learning Objectives

• Place the show for chemical reactions.

In a chemic alter, new substances are formed. In order for this to occur, the chemical bonds of the initial substances intermission, and the atoms that compose them separate and rearrange themselves into new substances with new chemical bonds. When this process occurs, we call it a chemical reaction. A chemical reaction is the process in which one or more substances are inverse into i or more new substances.

Figure \(\PageIndex{one}\): Clockwise from upper left. (A) Copper and nitric acid undergo a chemical modify to form copper nitrate and chocolate-brown, gaseous nitrogen dioxide (unknown via Wikipedia Commons). (B) A chemical reaction that gives off light, a process called chemiluminescence, occurs when a glow stick is aptitude, a crevice is heard and the inner solutions mix together (Anton Darius via Unsplash). (C) Cooking red meat causes a number of chemical changes, including the oxidation of iron in myoglobin that results in the familiar red-to-brown color change (Justus Menke via Unsplash). (D) A banana turning brown is a chemical change as new, darker substances that have a different sense of taste form (Bruno Emmanuelle via Unsplash).

To identify a chemical reaction, we look for a chemic change. A chemical change e'er produces ane or more types of matter that differ from the matter present earlier the alter. The formation of rust is a chemic change because rust is a dissimilar kind of matter than the fe, oxygen, and water nowadays before the rust formed. The explosion of nitroglycerin is a chemical change because the gases produced are very different kinds of matter from the original substance.

Diverse signs of a chemical reaction include:

1. Change in Color
2. Formation of a Gas
3. Formation of a Precipitate
4. Alter in Aroma
5. Change in Temperature
6. Something is Burning
7. Low-cal is Being Produced
   

Video \(\PageIndex{1}\): Evidence of a Chemical Reaction

✅Example \(\PageIndex{1}\): Evidence of a Chemic Reaction

Which of the following is a chemic reaction?

1. Freezing liquid mercury.
2. Adding yellowish to blue to make dark-green.
3. Cutting a piece of paper into 2 pieces.
4. Called-for natural gas.
5. Dissolving salt in water.

Solution

A, B, C, & E involve only physical changes. Burning involves a reaction with oxygen where the reacting materials have been consumed and the products have a unlike chemical composition, so the reply is D.

✏️Exercise \(\PageIndex{1}\)

Which of these involve a chemical reaction?

1. Painting a wall blue.
2. Mixing baking soda and vinegar to produce a gas.
3. Ice cream melting.
4. Boiling water.
5. Roasting a marshmallow over a flame until it turns brownish.

Answer

B and E

Summary

• Chemical reactions tin can be identified via a broad range of unlike observable factors including change in color, energy change (temperature change or low-cal produced), gas production, formation of precipitate and change in physical properties.
  

Types Of Chemical Reactions Answers,

Source: https://chem.libretexts.org/Courses/Anoka-Ramsey_Community_College/Introduction_to_Chemistry/07%3A_Chemical_Reactions/7.02%3A_Evidence_of_a_Chemical_Reaction

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