How did you know a Chemical reaction occurred??? How did you know a Chemical rea

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How did you know a Chemical reaction occurred???
How did you know a Chemical reaction occurred??? Studying Chemica Reaction Adapted from: Gillette at IU- Purpose: at Lebanon Valley College In this lab, we will describe chemical chemical equations. based on our observations and attempt to write Background Information: rrow, in o reactheth ould This was evident bu ing else. For arrow, in between the products and reactions. This can be rusting reaction, the chemical equation is as follows: emical cha when my car began to age, the iron began nges involve one s straightfoacted with oye rusolor e to Test. This was evident by the changing of color from straightforward to explain this phenomena in a chemical On the lett, c or reaction equation is simply the representation of a chemical prooes we place an a ot gives being iron solid reacted with oxygen in the air and was converted nation for the re have the starting This ould describe this process using a sentence such as: the material, or reactants. On the right, we have the produe On the left, we have the starting npr. We place an arrow, or reaction 4Fe(s) + 3009) 2Fe203(s) In chemical equations, we use more than just the formulas. A few of the symbols we will utilize are to show the states of the matter: (s) meaning the state of this material is a solid, (g) the material is in the gas state, (1) the material is a liquid, and (aq) means that the substance is dissolved in water. In front of the Fe, we have a coefficient, which indicates the number of the species that follows is involved. Here we have 4 irons reacting with 3 oxygens. As you will learn in lecture, we need to be sure that all of our chemical equations are balanced. As you can imagine, there are many different types of chemical reactions. We will discuss 4 of them in this lab. Combination or Synthesis Reaction: In this type of will combine t In this type of reaction, two or more substances In general, we can write this reaction as: 1. A+BAB In this type of reaction, one substance breaks apart to form two or more products. In general, we can writene s AB A + B

Explanation / Answer

Solution1.3)

In Reaction Mg + 2HCl = MgCl2 + H2

When all the mg metal is being consumed and Only reamain MgCl2 in the solution which is not visible.

Also in the process H2 bubble can be seen forming and after sometimes bubble formation has stopped

then we should understand reaction has occured.

Solution2.3)

When nitrate reacts with potassium iodide precipitate of PbI2 is formed which is yellow in color.

So when yellow precipitate formed we should understand reaction has occured.

Solution3.3)

When iron reacts with S8 precipitate of FeS is formed which is black in color.

So when black precipitate formed we should understand reaction has occured.

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