|
1.Nails rusting is an example of a chemical change. True False 2. Which of the following is NOT true about elements? Make up matter on earth but NOT in space They are pure substances Are located on the periodic table Represented by a chemical symbol 3. Mrs. Ruble was doing a demonstration in class. She began boiling a beaker of water on a hot plate. Over a period of 5 minutes, students observed steam rising from the beaker and the level of water in the beaker had reduced from 500mL to 350mL. This is evidence of: No change has occurred A change in the state of matter A chemical change An oxidation/reduction reaction 4. During this experiment, two white solids were combined in a bag. A red liquid was then added to them. All of the chemicals began fizzing and creating gas. The white solids turned into a yellow foam and became very warm to the touch. The title of this lab was: Sunset in a Bag (Chemical Reactions with Calcium Chloride, Baking soda, and Phenol Red) The Cooking Lab Chemical Reactions with Sodium and Water Chemical Reactions with Baking Soda and Vinegar Read the text and decide which chemical reaction experiment is beingdescribed: 5. During this experiment, ammonium thyocianate and barium hydroxide were added together in a flask. A stopper was placed on top of the flask and the two chemicals were mixed together. As they mixed, the two solids became a liquid, produced a gas, and became very cold. The title of this lab was: Chemical Reactions with Cold Liquids The Barium Hydroxide Change Chemical Reactions with White Flakey Solids Freezer Flask Read the text and decided which chemical reaction experiment is beingdescribed. 6.Mrs. Davis made some Kool-aid at home last weekend.As she mixed the Kool-aid, she noticed the water changed colors from clear to red. Since the water onlychanged colors because she added Kool-aid, Mrs. Davis knows: a chemical reaction happened she does not want red kool-aid anymore the water has changed into a brand new substance a chemical reaction did NOT happen 7."N" is the chemical symbol for which element? Carbon Nylon Nitrogen Helium 8.Salt contains the elements sodium and chlorine.The chemical symbol for these elements is: Fe and Ti Sm and Cn So and Ce Na and Cl 9.Which of the following is NOT an element: Titanium Sulfur Plastic Hydrogen 10.Which of the following is NOT an example of a chemical reaction? breaking into pieces temperature change creating light gas is produced 11.Which of the following IS an example of a chemical reaction? Energy change Unexpected color change Bubbles or fizzing All of the above 12.How many chemical symbols (elements) are represented in the folowing formula? HNCaAgOMgPbCuZn 11 7 15 9 |