Based on their observations, students are then asked to explain the evidence that a chemical reaction occurred. . Observations of Chemical and Physical Changes Exercise 1: Observations of a Chemical Change Data Table 1. Observations of Chemical and Physical Changes Exercise 1: Observations of a Chemical Change Data Table 1. B. Data Table 1: Chemical Change Observations. Chemical Reactions. Pre lab Exercise: 1. A chemical change is also called a chemical reaction. Operations to Introduce an External Stress- Record all observations in your data table. 3-gas formed 4-precipitate/solid formed. The evidence comes from observing the properties of the new substances. 1. Record observations on the data table. Expobservations recorded in Data Table 1 to reach this conclusion how you used the. Unexpected temperature change a. Endothermic - heat is absorbed. Heat the whole test tube until no more changes occur. To decide whether certain observed changes are physical or chemical. Specify whether each of the following changes is physical or chemical by placing a P Well Chemical #1 (4 drops) Chemical #2 (4 drops) Observations: Chemical Change (Y/N) A1 NaHCO 3 Sodium Bicarbonate HCl Hydrochloric Acid The product was clear, the reactant caused the product to bubble slightly. Social Psychology Observation Paper. *If you fold a piece of paper it is a physical change. Observations Before: Observations After: Evidence of Chemical Reaction (Circle all that apply) 1-energy. Differentiate between a physical and a chemical change. Experiment #3: Observing a Chemical Reaction II. 2. Do not touch the substance. Fill the 100-mL beaker about one-fourth full with distilled water. /21 /21 : Follow up Questions: Correctly identifies and explains the theory relating to the experiment and supports this with accurate observations & data. LAB REPORT 4 Observations of Chemical and Physical Change PART 1 - OBSERVATIONS OF CHEMICAL CHANGE No credit will be given for this lab report if the Data section is not completely filled out and if the required photographs are not received. Cu and HNO3 2. Get a piece of copper wire from your teacher. Prelab Questions. Get a piece of magnesium from your . 10. Record your observations in the data table. They must collect data and then develop a testable question based upon all of the data collected. G1 The reaction . Use the drop-down menu options to record any physical and/or chemical changes observed. When energy is released in an exothermic reaction, the temperature of the reaction mixture increases. 2. Station 1: Examine a wood splint and note its physical properties in the table below. A. The Dissolved Inorganic Phosphorus (DIP) varied between 0.2 M and 1.3 M in winter (Table 1), while it varied between 0.1 M and 1.6 M in summer (Table 2).The highest concentration is . Gas . The major clues which indicate a chemical reaction are: 1. 2) To decide if an observed change is physical or chemical. 1) To observe physical and chemical properties. Tables 2-1 Physical Properties of the Elements and Inorganic . I. That gas causes the bubbles and fizzing. They placed each substance into a beaker of acid and recorded their observations. Chemistry questions and answers. 4. You may use it as a guide or sample for writing your own paper . Record your observations of both the solid and the . 2. These include: 1. Do not touch the substance. Without stirring, add 1 level teaspoonful of the solid to the water. Record examined observations of physical appearance. To observe the physical and chemical properties of several substances. Define the following terms . 1. Add a few drops of this solution to each of seven wells of a spot plate. 2) To decide if an observed change is physical or chemical. See average annual change for different time periods at the bottom of this table. (feels cooler) b. Exothermic - heat is released. To remove the tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Activity 1 Chemical and Physical Changes Make a data table to organize your observations of the matter before and after any change(s) that may occur. Use your data table above to identify the physical and chemical changes observed in the demonstrations as follows: Complete Data Chart above filling in Scientific Methods for each demonstration. Part 1 Data Table: SUBSTANCE FORMULA . C.1.3 Recognize indicators of chemical changes such as temperature change, the production of a gas, the production of a precipitate, or a color change. Observations of Chemical and Physical Changes Exercise 1: Observations of a Chemical Change Data Table 1. Here we describe new and updated best practice data standards for discrete chemical oceanographic observations, specifically those dealing with column header . Effective data management plays a key role in oceanographic research as cruise-based data, collected from different laboratories and expeditions, are commonly compiled to investigate regional to global oceanographic processes. Examine the wire and note any change in its appearance caused by heating. If Negative: no color change---no starch in the food being tested. Year AL AR AZ CA CO CT DE FL GA IA ID IL IN KS KY LA MA MD ME MI MN MO MS MT NC ND NE NH NJ NM NV NY OH OK OR PA RI SC SD TN TX UT VA VT WA . 1. Chemistry questions and answers. /21 /21 : Conclusion: Monitor temperature change. One well will serve as a color standard against which to judge color changes in the . At least one photograph must show the student's face. Pour about 4-5 mL of the iron-thiocyanate solution made above into three test tubes. Change in odor 3. Chemical Reactions. Label each substance on seven pieces . LAB REPORT 4 Observations of Chemical and Physical Change PART 1 - OBSERVATIONS OF CHEMICAL CHANGE No credit will be given for this lab report if the Data section is not completely filled out and if the required photographs are not received. In the provided data table, you will record observations that will help you decide which type of change has occurred. Follow your teacher's instructions for disposing of the used chemicals. Zn and HCl In-lab Question 1. Put your cans in the hood to recycle or in a recycling bin. VISTA HEIGHTS 8TH GRADE SCIENCE. 1. A precipitate (solid) forms 3. Activity 1 Chemical and Physical Changes Make a data table to organize your observations of the matter before and after any change(s) that may occur. Note: Indices are relative to Alabama in 1996 = 1. Using crucible tongs, hold the wire in the hottest part of a burner flame for 1 to 2 minutes. Background 1. III. A1 Bubbles immediately formed and started popping (not rapidly). Describe the similarities and/or differences between heating and burning the magnesium metal. Data, Results: Provides results & detailed observations (and diagrams where appropriate) that are presented in correctly labelled tables with descriptive, numbered titles. Identify the following as examples as either Physical or Chemical changes . Did either heating or burning produce a chemical change? Part 1: The Physical Properties of Matter - Examine each substance carefully. Data Table 2: Heating and Combustion Chemical Initial Observations Heating Observations Mg Zn Solid, shiny silver, flat sample less than half a cm. Then allow the melted wax to cool. I. Heat an ice cube in a beaker. Background: Chemical reactions involve the rearrangement of atoms or ions to create new substances with different properties. These changes can be divided into 2 classes: physical changes and chemical changes. 7. The magnet separates the iron filings . Identify the following as examples as either Physical or Chemical changes . 2. Explain your answer. Add one drop each of 1 M Fe(NO 3) 3 and 1 M KNCS to 25 mL of distilled water. 2-color change. Helium boils at 4.22 K. 2. Question/ Well Number Chemicals Reactions/Observation. Procedure Copy Tables 2-1 and 2-2 into your laboratory notebook. b. Identifying Exothermic & Endothermic Reactions. Add the zinc to the test tube. Observations of Chemical Changes. Obtain 1-2 pieces of zinc (Zn). In a physical change, one or more physical properties of a substance are altered. Well Chemical #1 (4 drops) Chemical #2 (4 drops) Observations: Chemical Change (Y/N) A1 NaHCO 3 Sodium Bicarbonate HCl Hydrochloric Acid Clear. Experiment Observations Experiment #1 Magnesium reaction in krucible Type of Reaction: $ Balanced Chemical Reaction: Experiment #2 Heating copper (II) carbonate hydroxide Type of Reaction . If Positive: a dark blue color appear---there is starch in the food being tested. Mix well. This essay was written by a fellow student. Observe both the crystals and the water and record. observations, and type of change for each task. What was the identity of the anion in Unknown #104? Friend, National Institutes of Standards and Technology, Boulder, CO. (Tables 2-333, When the chemicals in the soda mix with the air while being poured into the glass, a gas is released. 2. 2. Please reproduce all sections (prelab, procedure, observations, data tables, calculations and critical thinking questions) of this lab in your comp book. Fill a 100-mL beaker about one-fourth full of tap water. Allow to react for several minutes and observe the resulting chemical reaction. 2)Use your results and observations in Data Tables 1, 2, and 3, to create a flow chart for the identification of an unknown (both an unknown anion and cation), using the AgNO3 and HCl confirmation tests and the cation flame tests. Print this form and bring it with you to lab. Effect of Temperature on the Equilibrium - Also record your observations in the data table. a. Include one photograph from the chemical reaction tests in Data Table 1, one photograph of the food/starch test, and one photograph of the household chemical test. 5 Word(s) 2Ag+2No +2Na+S = Ag S+2Na+2No 2Ag+S = Ag S. 3. A chemical change is a change in the composition of the original substance. Record observations of this solution in your data table. NaHCO3 + HCl Nothing occurred it remained the same. Information, Data, and Observations Part 1. Record observations of this solution in your data table. Describe the dry crystals in detail and record. Explain your answer. Lab # 6: Physical and Chemical Changes 7 PRESTUDY 1. 2. Set one tube aside as a color standard against which to judge color changes in the other tubes. 3-1 Chemical and Physical Change - Lab (Doc) 3-1 Chemical and Physical Change - Lab Answers (PDF) 3-1 Chemical and Physical Change - Lab Answers (Doc) Background Theory: Physical changes usually involve a compounds state of matter where heat energy is added or removed. When the chemicals in the soda mix with the air while being poured into the glass, a gas is released. By contrast, chemical . Light the wood split using a match until it takes fire and allow it to burn itself out on the ceramic tile. (physical and chemical data) George H. Thomson,AIChE Design Institute for Physical Property Data. (feels hotter) 4. Write the chemical equation for the ionic reaction between Na S and AgNO. Data Collection: Visit each station and fill in the data table for each task. To classify the types of chemical reactions based on observations . Data Table 1: Chemical Change Observations. I believe that this is the result of a chemical change. Which reactions produced a color change? on determining if a physical or chemical change happened at your station. (Be sure to make observations regarding both the solution and the zinc.) Indices of agricultural chemical input by State, 1960-2004 . (Tables 2-6, 2-30, 2-164, 2-193, 2-196, 2-198, 2-221) D.G. Chemical Reactions. Zn and HNO3 4. Record examined observations of physical appearance. Part A: Making Observations in the Laboratory Observations - describe what happened Did a chemical reaction occur? Examine each substance with a magnifying glass. Then allow the melted wax to cool. A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. A color change After the test tube has cooled, add 2 drops of water to the crystals and observe any changes that occur. No color change, clear. (Be sure to make observations regarding both the solution and the zinc.) Physical change is a change in which the substance changes form but keeps its same chemical composition (reversible). The balanced chemical reaction : Exercise 2 This could be seen more easily with the black paper underneath the well plate. 2 3 B I U 3 2 3 -2 2. Version 42-0182-00-03 Abstract: Observations: Exercise 1: Observations of a Chemical Change Data Table 1. Using a pipet two drops each chemical was deposited into the 24-well plate. Data Allow to react for several minutes and observe the resulting chemical reaction. Solid, silver, bumpy dullish outer shell. Part 1 Data Table: SUBSTANCE FORMULA . Describe the change in color for each of these reactions. C The acid is turning into a base. When Bromothymol Blue reacts with an acid, it turned orange, and when it reacts with a base, the end result is blue. Note the appearance of the wire. Resembled hot lava for a moment as the metal sunk into itself, became . A The sugar is becoming coal. 1) To observe physical and chemical properties. (1) Classify the following as chemical (C) or physical (P) changes. A / A1. Data Table 2 contains nine double displacement reactions. Chemical changes: These do change the composition of the substance. Table 15. Complete Data Tables 2 and 3, identifying each change you observed as chemical or physical. Heat Capacity of the Calorimeter Table 1. 3. A chemical change or reaction occurs when new kinds of matter are formed. OBJECTIVES 1. Without stirring, add the crystals. There are two methods for distinguishing between exothermic and endothermic reactions. Unexpected color change 2. PHYSICAL AND CHEMICAL PROPERTIES DATA SHEET: Report all values with units and the proper number of significant figures. Record your initial observations. Put two pieces of magnesium ribbon on the paper labeled "Magnesium". 2. Data Table 1: Chemical Change Observations Chemical #1 Appearance Weil Chemical #1 (4 drops) A1 NaHCO, Sodium Bicarbonate Chemical #24 drops) Chemical #2 Appearance Observations Chemical Change (Y/N) HCI Hydrochloric Acid A2 IKI Indicator Starch A3 KI Potassium lodide A4 NaOH Sodium Hydroxide HCI Hydrochloric . Chemists have developed a list of common signs that may indicate the occurrence of a chemical change. Melt a small amount of candle wax. Make a detailed observation of the remaining substance in the test tube. Data Tables and Observations. Wash your hands thoroughly with warm water and soap or detergent before leaving the laboratory. Data Table 1. Well Chemical #1 (4 drops) Chemical #2 (4 drops) Observations: Chemical Change (Y/N) A1 NaHCO 3 Sodium Bicarbonate HCl Hydrochloric Acid When the HCL was added, it bubbled for about 2 seconds then stopped. (2) Write the following underlined reaction in terms of a balanced equation. Bubbles of gas appear 2. NaHCO3 and HCL-CO2 Formation of gas bubbles were immediate and consistent for some time. Rounded sample about a cm in length. Q. As you perform the experiment, record your data and observations in these tables. Data Table 4. Part 1: The Physical Properties of Matter - Examine each substance carefully. Cu and HCl 3. 300 seconds. Record your observations in the data table. 1. Which reactions produced a precipitate? Record your observations of the crystals and the inside of the test tube while heating it. . You will complete Section I as you carry out the experiment. Explain your answer using the observations collected in Data Table 2 Data Table 1 - Chemical Reactions Well Chemicals Observations Chemical Change? Leave the substance in the container. Is cutting a cake into 8 pieces a chemical or a physical change? Write each Remember that when a chemical change occurs, a new substance must be formed. *Changes of state are considered to be physical changes. Two clear, colorless solutions are mixed and a yellow solid forms. Well Chemical #1 (4 drops) Chemical #2 (4 drops) Observations: Chemical Change (Y/N) A1 NaHCO3 Sodium Bicarbonate HCl Hydrochloric Acid A2 NaOCl Sodium . Record your observations in the data table. page 1 Thermochemistry: Measuring Enthalpy Change in Chemical Reactions Experiment created by the UMaine InterChemNet Team. Add 1 mL (20 drops) of iodine solution into the test tube containing the food being tested with a pipet and observe. Observations of Chemical Changes. The product chemical is different from what you started with, the chemical formula does change. When the chemicals in the soda mix with the air while being poured into the glass, a gas is released. Evidence of a Chemical Change 1. Chemical Reactions. Turned black then red hot, momentary popping sound, area around sample forms white powder residue. Lord of the Flies: Fear of the Unknown. 7. Food testing lab. Is cutting a cake into 8 pieces a chemical or a physical change? No NaOCl + KI Observation 1: It turned brown, but . That gas causes the bubbles and fizzing. Describe the observations when answering this question. Be detailed in your observations. E1 The reaction turned dark blue. Answer : Reaction 1 : Add Zinc to Copper Sulfate. Add the zinc to the test tube. A new substance is being formed. Evidence of a chemical change may be the result of chemicals reacting with one another. The chemical mixtures are noted below in the Data Tables. Students were given 4 different solid substances during an investigation on physical and chemical changes. B A new substance is being formed. Gently warm the second tube in a hot water bath on a hot plate. Boil a small amount of water. Anion Confirmation Tests. the original substance. C.1.12 Demonstrate the principle of . -Part A: Record all observations of Part A in Data Table 1 1. Question: Experiment 1 Exercise 1 Data Table 1 Data Table 1: Observations of Chemical Reactions with Aluminium Foil AgNO3 CuSO4 CaCl2 Pb (NO3)2 Start Time colorless blue white colorless grayish white grayish white grayish white grayish white Initial Appearance of Chemical Initial Appearance of Foil Observations after 5 Minutes Observations . Procedure: In this experiment, various chemicals were mixed together, to determine a reaction. Place an evaporating dish near the base of the burner. transfer. Outline those changes in properties or changes in energy that resulted from the chemical reactions you observe. Interpretation - judgment or opinion about what you have observed 3. Exercise 2: Heating and Combustion. Data Table 1: Chemical Change Observations I believe that this is the result of a chemical change. Obtain a sample of copper (II) chloride. Did either heating or burning produce a chemical change? Liquid water and ice (frozen water) are both the same substance, water. Boil a small amount of water. What are the indications of a chemical change, a chemical reaction? 3. Date Table 1: Anion Confirmation Tests. on determining if a physical or chemical change happened at your station. Purpose: To learn how qualitative and quantitative observations of a chemical reaction are used to formulate a hypothesis. Observations of Reactants : Zinc is in solid state and copper sulfate in aqueous state. Chemical Reactions. Test the effect of a magnet on each substance by passing the magnet undershow more content. A gas or a solid may be formed where the products are in a different . 7. Melt a small amount of candle wax. System Observations Sucrose, C12H22O11-heated NaHCO3-reacted with 6M HCl Fe and S mixture-heated-initial mass-final mass ANALYSIS AND CONCLUSIONS: The following is a list of changes you observed in Parts B and C. Indicate whether each change was a physical change or a chemical change and give evidence for your answer. Record your observations in Data Table 4. Write a balanced chemical equation for five of those reactions. Predicted Type(s) of Reaction : Single-displacement reaction Observations of Products : Copper is in solid state and zinc sulfate in aqueous state. 1. Record observations in Data Table 1. Exercise 2: Heating and Combustion. The composition of the matter changes and the new kinds of matter have different properties from the old matter. After analyzing your data, you will determine if there is evidence for a physical or chemical change. Label each substance on seven pieces of paper. Record your observations in the data table. Thank you. Well Chemical #1 (4 drops) Chemical #2 (4 drops) Observations: Chemical Change (Y/N) A1 NaHCO 3 Sodium Bicarbonate HCl Hydrochloric Acid Bubbled and fizzed to the top. When energy is absorbed in an endothermic reaction, the temperature decreases. Station 1: Examine a wood splint and note its physical properties in the table below. Grinding, melting, dissolving, and evaporating are all physical changes. That gas causes the bubbles and fizzing. 2. Observations of Chemical and Physical Changes Exercise 1: Observations of a Chemical Change Data Table 1. Baking soda was added to the hot water and stirred. Record your initial observations. Obtain and describe a sample of copper(II) chloride dihydrate, CuCl 22H 2O. your observations in the Data Table. Observations of Chemical and Physical Changes Hands-On Labs, Inc. Describe the similarities and/or differences between heating and burning the magnesium metal. Purpose: The purpose of this experiment is to observe chemical changes in common consumer products to determine if the chemicals are basic, acidic, or remain neutral when mixed with other chemicals. Obtain 1-2 pieces of zinc (Zn). B I U. Light the wood split using a match until it takes fire and allow it to burn itself out on the ceramic tile. Explain your answer using the observations collected in Data Table 2 Students then perform 10 more chemical reactions with unknown powders (labeled A - F) and liquids (labeled 1 - 6). Adapted with permission. 1. I believe that this is the result of a chemical change. Observation - statement of fact, based on what you detect by your senses 2. As you perform the experiment, record your observations in Data Table 1. Is cutting a cake into 8 pieces a chemical or a physical change? V. Conclusion (Discuss the lab's purpose and what you observed and learned about chemical changes) Questions: of copper (II) chloride to the water. Heat an ice cube in a beaker. Observations DATA TABLE 1 Material Observations Test tube 1: magnesium chloride . Examples of such physical properties are: size, shape, color, and state of matter. Day Three Data Table. Note: Always make as many observations as possible . Leave the substance in the container. For this reason, physical changes can be reversed. . Table 1: Chemical Reaction Recorded Data Record reaction changes; temperature changes, mass changes, phase changes, etc. While certain chemicals may react the same way with on mixture, testing a chemical with multiple mixtures will most likely allow the chemical to be identified. Record your observations in the data table on your report sheet. Be detailed in your observations.