Chem 1 Final Review

Which of the following describes the classification of Xenon gas (Xe)?

• pure substance, element, exists as an atom.
• homogeneous mixture
• pure substance, compound, exists as a molecule
• heterogeneous mixture

5. Classify the following as a law, theory, or observation: "When propane gas is burned, heat is released"

• observation
• law
• theory
• hypothesis

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

12. According to the Law of ______________ all samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements

• definite proportions
• multiple proportions
• conservation of mass
• conservation of energy

21. ______________ 's cathode ray experiments showed the existence of ______________ and determined their charge-to-mass ratio

• J.J. Thomson, electrons
• Rutherford, protons
• Dalton, atoms
• Millikan, neutron

27. What is the symbol for a 2-ion with 36 electrons and 44 neutrons?

• ^78Se^2-
• ^80Se^2-
• ^78Kr
• ^78S^2-

Tags

NGSS.HS-PS1-1

31. An element has two naturally occurring isotopes. The first isotope has a mass of 78.9183 and abundance of 50.69%. The second isotope has a mass of 80.9163. Find the atomic mass of the element, giving your answer to 4 significant figures. Identify the element.

• 79.90, Br
• 80.42, Br
• 78.92, Se
• 79.90, Se

35. 1 THz = ______________ Hz

• 10^12
• 10^-12
• 10^9
• 10^-9

Tags

NGSS.HS-PS4-1

45. A scale at the supermarket has markings every 0.1 lb. Which of the following reports a measurement of the weight of apples on this scale to the correct number of significant figures?

• 15.41 lb
• 15 lb
• 15.4 lb
• 15.412 lb

53. ______________ properties do not depend on the amount of substance; an example would be ______________

• Intensive; density
• Extensive; mass
• Intensive; mass
• Extensive; temperature

58. How far in yards can a runner travel in 3.50 minutes if her average speed is 9.37 miles per hour? Give your answer to 3 significant figures.

• 962 yards
• 321 yards
• 55100 yards
• 962 ft