Lab Report: Observing Chemical Reactions

1. Which reactants used in this experiment are flammable? Discuss the safety precautions that are necessary when working with flammable materials in the lab?

Procedure: In this experiment, various chemicals were mixed together, to determine a reaction. Using two drops from chemical 1 and two drops of chemical two, unless otherwise stated, then recording the type of physical reaction or color changes that occurred.

These reactions can be seen from just a little bit of reaction all the way up to a complete change of the entire sample tested. Some samples of those tested in this experiment which showed the chemical reaction were the baking soda/ammonia mixture, the Epson salt and baking soda mixture as well as the food coloring mixed with the baking soda and bleach. 2. Which reactions, if any, do you believe showed no evidence of chemical change? Justify your reasoning.

A chemical reaction is when substances (reactants) change into other substances (products). The five general types of chemical reactions are synthesis (also known as direct combination), decomposition, single replacement (also known as single displacement), double replacement (also known as double displacement), and combustion. In this lab, the five general types of chemical reactions were conducted and observations were taken before, during, and after the reaction. Then the reactants and observations were used to determine the products to form a balanced chemical equation. The purpose of this lab was to learn and answer the question: How can observations be used to determine the identity of substances produced in a chemical reaction?

When the zinc was dropped in the hydrochloric acid, the substance began bubbling vigorously, forming a precipitate. Eventually, the zinc dissolved completely. After the lit wooden splint broke the surface of the test tube, there was a loud popping noise. The gas that was released was hydrogen from the acid and the popping noise was a result of the Hydrogen being burned up by the fire creating a small explosion. Two chemical changes occurred in this test: one with the formation of a precipitate (a textbook sign of a chemical change), and the other when the explosion

8. Repeat step 7 with H2SO4, except that you should use a 10 mL graduated cylinder of H2SO4 and adding 15 mL water.

Steel wool was used since it is virtually pure iron. In this reaction single displacement had occurred.

Purpose: The purpose of this experiment is to observe a variety of chemical reactions and to identify patterns in the conversion of reactants into products.

The purpose of this experiment is to distinguish the relationships between reactants and products, in addition to expanding on concepts such as single displacement reactions, mole ratio values, moles to mass, theoretical yields, limiting reactants, excess, stoichiometric relationships and percentage errors.

The vinegar in my closed chamber, also started to become dingy, and there was some egg she'll remains mixed with bubbles around the vinegar. I know that a chemical reaction took place, because the egg shell started to dissolve from the acid and the bubbles in the vinegar. I also know that a chemical reaction took place, because part of the egg shell started to form into a different

NaCl + CuSO4 Clear blue liquid, no precipitate *NaCl + AgNO3 Opaque liquid, white precipitate NaCl + Ba(NO3)2 Clear liquid, no reaction, no precipitate NaCl + Pb(NO3)2 Clear liquid, no reaction, no precipitate NaCl + CuSO4 Clear blue liquid, no precipitate Na2SO4 + CuSO4 Clear liquid, no reaction, no precipitate Na2SO4 + AgNO3 Clear liquid, no reaction, no precipitate *Na2SO4 + Ba(NO3)2 White foggy liquid, precipitate *Na2SO4 + Pb(NO3)2 Foggy floating white liquid, NaSO4 at the bottom, precipitate CuSO4 + AgNO3 Clear liquid, no reaction, no precipitate *CuSO4 + Ba(NO3)2 Opaque light blue, precipitate *CuSO4 + Pb(NO3)2 Opaque light blue,

The liquid (vinegar) and solid (baking soda) formed into a gas. A: Chemical reaction procedure 2: The evidence that a chemical reaction was occurring was there was a bit of fizzing with the bubbles. The liquid and solid formed into a gas which also inflated the balloon and you cannot reverse that. 3. Q: How did the final mass of the system compare with the initial mass of the system for each procedure?

This paper is about chemical reactions and chemical reaction types. All the data gathered was from conducting multiple experiments. Each experiment was performed carefully and analyzed to obtain the necessary information for the paper. That information included the four signs of a chemical change, the rnx type, and more.

This experiment is dived into five cycle steps. The first step of the cycle was the reaction of copper when it reacted with nitric acid forming reaction one. As this reaction occurred, I observed how the beaker started to bubble, the sides of the beaker turned yellow at first then it vanished immediately turning the solution light blue. The fume vaporized as the copper started to dissolve. The reaction occurred in step one was double replacement.

-bubbles float on the surface of liquid -the liquid is turbid In the synthesis experiment, we can see that some small and dark brown chunks appeared. The whole steel wool turned dark black with a burning smell. Nothing changed of the liquid. (see table 2)