Elements and Compounds Questions
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- Meagan Barber
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1 Name period date assigned date due date returned 1. Which elements are found in photosynthesis and cellular respiration? 2. What compounds are found in photosynthesis and cellular respiration? 1
2 Benedicts solution is used to test for simple sugars. The clear blue solution was discovered by American chemist Stanley Rossiter Benedict. When Bendedict s solution is added to a liquid and heated, the blue solution will change to green, yellow or brick red, depending on the amount of sugar and length of time the solution was heated. If no sugar is present, the solution remains blue. 3 What equipment is necessary when testing for the presence of sugar? A thermometer, litmus paper, water, hot plate B beaker, tongs, hot plate, water funnel, beaker, water D microscope, dropper, slide, heat shield 4 What safety precautions should be observed when testing for the presence of sugar? (there are 2, circle them) 2
3 Magnesium (Mg) is a silvery white metal and is the eighth most abundant element in the Earth s crust. It is also the fourth most abundant mineral in the human body, essential for healthy nerve and bone functions. Magnesium oxide (MgO) has many uses. It is used in medicines for heartburn relief, in fireworks and fertilizers, and is added to concrete to absorb moisture. Hayden s teacher produced small amount of magnesium oxide during a classroom demonstration by attaching a thin strip of magnesium ribbon to a ring stand and igniting the ribbon with a lighter. She did not look at the intense bright light to avoid possible eye damage from the ultraviolet light. After several seconds, the magnesium strip burned through the entire length, leaving a white powdery substance behind. 5 Which properties of magnesium make it desirable for use in fireworks? G Magnesium is flammable and produces an extremely bright light when ignited Magnesium absorbs moisture from the air as it burns, thus reducing the potential for fires. H Magnesium is slow burning and produces long-lasting flashes of light. Magnesium powder that falls to the ground after a fireworks display is a beneficial plant fertilizer 6 The chemical change in this demonstration is MOST SIMILAR to A freezing water on the surface of a pond during winter. 7 What laboratory equipment is essential for this demonstration? stop watch G thermometer B sunlight fading colors on clothes H balance burning wood in a campfire safety goggles D shattering a windshield during a hail storm 3
4 8 What are the four elements needed by plants and animals in the manufacture of protein? A carbon, oxygen, nitrogen, helium B carbon, hydrogen, nitrogen, sodium carbon, hydrogen, oxygen, potassium D carbon, hydrogen, oxygen, nitrogen 9 Acetic acid is a compound found in vinegar. The chemical formula for acetic acid is H 3 OOH. How many different elements are in acetic acid? 3 G 6 H What substance could be represented by the X in the diagram below? carbon hydrogen oxygen nitrogen organic compounds proteins X DNA fats A carbohydrates B ozone carbon dioxide D water 4
5 11 Which element is found in abundance in the human body, but is not found in abundance in the Earth? oxygen G carbon H calcium silicon 12 Which element is found in abundance, in both the human body and in the Earth? A oxygen B carbon calcium D silicon 13 Which element has the ability to form straight chains, branched chains, and rings because its atoms can form four covalent bonds. carbon G hydrogen H nitrogen oxygen 14 Which of the following is an organic compound that provides the basic form of fuel (energy) to living cells? A glucose B water sodium chloride D oxygen gas 5
6 15 Scientists found four areas around a hydrothermal vent that they thought could support life. The scientists took samples of the elements in the area? Area Area 1 Area 2 Area 3 Area 4 Elements in the Area sulfur, hydrogen and plutonium carbon, hydrogen oxygen, helium, calcium nitrogen, potassium, xeon Based on the data table, which area would have the BEST chance at having organic compounds? Area 1 G Area 2 H Area 3 Area 4 16 orn is an organic compound. What are the main elements found in corn? A carbon, sulfur, calcium B carbon, magnesium, nitrogen carbon, nitrogen, sodium D carbon, hydrogen, oxygen 6
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