Safety: Sodium carbonate is corrosive, toxic and infectious. Hydrochloric acid is corrosive. Copper (II) Sulphate is toxic and infectious. Procedure: Refer to page 158 in Pearson Investigating Science 9. A change made was instead of 5 mL it was 3mL.
A definite new smell Unable to reverse the change C. Give at least two examples of chemical changes you observed. Copper Changed color when placed over heat. Mg-when HCl is placed on it can hear fizzing and gas bubble produced D. Classify the following properties of sodium metal as physical or chemical: Silver metallic color – physical Turns gray in air – chemical Melts at 98°C – physical Reacts explosively with chlorine –chemical E. Classify the following changes as physical or
C. Is this reaction endothermic or exothermic? ----------------------- September 16, 2012 When HC1 was added the equilibrium should have shifted to the left, the opposite direction from its original state. The solution added reacted by consuming the substance turning the solution into a cloudy white color. When Na2EDTA was added the equilibrium should have shifted to the left, the opposite direction from its original state. The solution added reacted by turning the solution into a transparent liquid.
Reaction D mixed Pb(NO3)2 and CuCl2 that created a PPT reaction. Reaction E mixed Pb(NO3)2 and K2CrO4 which was a PPT reaction that was a yellowish color. Reaction F mixed CuCl2 and K2CrO4 which created a PPT reaction with a tan/brown color. Based on the results, the correct phase of a product can be determined by looking to see if it is soluble or insoluble. The aqueous phase is soluble and the solid phase is insoluble.
With iodine it changes to a brown color and becomes clumpy. Using the mystery powder key, experimental results were compared to know results of baking soda,baking powder,cornstarch and powdered sugar. Chemical changes were made when a substance fizzes up or changes color. When a substance fizzed up into bubbles, it indicated a reactivity of solubility and a chemical change. Physical changes were indicated when a substance only reacted once.
Chromatography: Separating Mixtures Introduction: Magic marker inks are often mixtures of several compounds. Paper chromatography is a common method of separating various components of a mixture. After separation, you can observe the different colors that make up a particular color of magic marker ink. You can also calculate a ratio Rf, which compares how far each compound traveled to how far each solvent (substance that dissolves another substance) traveled during the experiment. Rf = Ds/Df Ds = Distance traveled by the compound Df = Distance traveled by the solvent Materials: coffee filter, tape, isopropyl alcohol (rubbing alcohol), water, 3 different color magic markers (not permanent); 3 identical tall, narrow drinking glasses; metric ruler, 3 pencils Pre-lab Questions: 1.
TCB is relatively similar to Chlorobenzene in regards of being an essential part in the production of dye. TBC is also used as a dielectric fluid in transformers, and at one time used to kill termites (DHSS, 2010). Individuals who ingest drinking water containing TBC can be exposed to side effects such as neurological issues including nervousness, restlessness and/or weakness. Serious more critical side effects may also occur such as tremors, increased heart rate or blood pressure, digestive issues, weight loss, as well as headaches (DHSS, 2010). Individuals working at Ciba- Geigy Corporation may be been exposed to TBC by breathing since levels or exposure are highest where the chemical is made or used.
Lastly, to get a liquid back to a solid, it simply needs to be FROZEN, (freezing point is 0 degrees) this can happen but putting the liquid in cold place for example a freezer where the temperature is below 0 degrees in order for it to change back to its original state. Kinetic energy it is the energy that affects motion of particles, which are atoms and molecules. The total kinetic energy of the particles in a substance is called thermal energy. A solid can change state into a liquid by sublimation, this happens when the pressure increases or
Identification of Copper (II) Chloride Introduction Through a series of cation and anion confirmation and elimination tests, the identity of an unknown compound can be determined. By subjecting certain standards to a series of tests, it will be known how they react when trying to identify the unknown. The results of these tests are crucial to correct identification of the unknown compound. Materials and Methods 0.5 grams of the unknown 11 was added to 5 mL of distilled water in a centrifuge tube to make the stock solution. To determine the cation, 6 M NaOH was added dropwise to the unknown solution until a precipitate was formed.
Name five chemical irritants. ANS: The text lists at least seven: ammonia gas, chromic acid, chlorine gas, fluorine, bromine, oxides of nitrogen, phosgene ref. p. 201-202 9.3. What distinguishing effect do irritants have upon the body? ANS: inflame the surfaces of the parts of the body by their corrosive action ref.