Physical Science Pre-Test 2020-2021 Question: 1-14
A student has been assigned to measure the density of an irregularly shaped piece of metal. Which tools would be most appropriate to carry out this task?
ruler, balance
flask, Bunsen burner
beaker, crucible (container)
graduated cylinder, balance

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

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Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.