Which of the following electromagnetic waves has the shortest wavelength? A. visible light waves B. ultraviolet waves C. microwaves D. infrared waves
1. Who first published the classification of the elements that is the basis of our periodic table today? 2. By what property did Mendeleev arrange the elements? 3. By what property did Moseley suggest that the periodic table be arranged? 4. “The properties of the elements repeat periodically” defines the _____. 5. What is a period and how many are there in the periodic table? 6. What is a group (also called a family)? How many are there in the periodic table? 7. State the number of valence electrons in the following: Element Valence Electrons Magnesium Phosphorous Fluorine Neon 8. Give the names and chemical symbols for the following: Atomic Number Element Name Chemical Symbol 13 92 5 25 9. List, by number, both the period and group of each of these elements. Element Symbol Period Group Beryllium Be Iron Fe Lead Pb 10. Which of the following pairs of elements belong to the same period? Highlight a. Na and Cl b. Na and Li c. Na and Cu d. Na and Ne 11. Which of the following pairs of elements belong to the same group? Highlight a. H and He b. Li and Be c. C and Pb d. Ga and Ge 12. What group numbers are the transitions elements? 13. What are the group 1/IA elements called? 14. What are the group 2/IIA elements called? 15. What are the group 17/VIIA elements called? 16. What are the group 18/VIIIA elements called? 17. Which alkali metal belongs to the sixth period? 18. Which halogen belongs to the fourth period? 19. What element is in the fifth period and the eleventh group? 20. What is the heaviest noble gas? 21. What is the heaviest alkaline earth metal? 22. Would you expect strontium to be, chemically, more similar to calcium or rubidium and WHY? 23. List the three lightest noble gases. 24. List all of the alkali metals
what characteristic of carbon (c) makes it essential to living organisms A. Carbon forms crystal structures under certain conditions B. Carbon can exist as a solid,liquid,or gas C. Carbon bonds in many ways with itself to form chains D. Carbon exists in radioactive forms
a team of scientists is studying a volcanic hot spring. Which task would the physical scientist most likely do? A. Find out where the hot water is coming from B. Study the effects of the hot spring on humans C. Studying the organisms that live in the hot spring D. Find out what elements are in the hot spring
What principal of a lever is being used in this photograph? A. A bottle opener is a type of lever that reduces the input force required by reducing the distance over which the force is applied. B. A bottle opener is a type of lever that enables the same work to be done over a shorter distance with less force. C. A bottle opener is a lever in which a smaller input force acts over a larger distance so that a larger output force can act over a smaller distance. D. A bottle opener is a type of lever that magnifies the output force required.
imagine a glass box that is completely sealed and in that box is a cactus in a small pot which statement is most accurate? A. This is an open system because the light can go through the glass and get into the box B. This is an open system because air is circulating inside the glass box C. This is a closed system because nothing of substance and get in or out of the box D. This is a closed system because of light enters through the glass box
Mr. Arnold's 5th grade science class did an experiment to see if mold would grow better on moist bread or on dry bread. Each lab group was given two pieces of bread. They were to add 20 mL of water to one piece of bread and no water to the other piece of bread. They were also to keep both pieces of bread in a cool, dark place and to make daily observations of the bread. However, Keisha and Sam did not read the lab procedure carefully and they put 20 mL of water on one piece of bread and 40 mL of water on the other piece of bread. At the conclusion of the experiment, mold had grown on both pieces of their bread. On which piece of bread did mold grow better? a Mold grew better on the moist bread. b Mold grew better on the bread kept in the dark. c Mold grew better on the dry bread. d We don't know since Keisha and Sam added water to both pieces of bread.
