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Would freezing liquid mercury be considered a physical or chemical change?

Would freezing liquid mercury be considered a physical or chemical change?. physical. Would dissolving sodium chloride in water be considered a physical or chemical change?. physical. What are the two categories of pure substances?. Elements and compounds.

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Would freezing liquid mercury be considered a physical or chemical change?

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  1. Would freezing liquid mercury be considered a physical or chemical change?

  2. physical

  3. Would dissolving sodium chloride in water be considered a physical or chemical change?

  4. physical

  5. What are the two categories of pure substances?

  6. Elements and compounds

  7. How can an element be further separated? By ordinary physical means; By ordinary chemical means; Or it cannot be further separated by ordinary physical or chemical means.

  8. Cannot be separated by ordinary physical or chemical means

  9. As what type of matter would you classify vinegar?

  10. Homogeneous mixture

  11. At one point in the school year, our room was a comfortable 85°F. Is this observation qualitative or quantitative?

  12. quantitative

  13. A group of measurements that closely agree with one another but are far from the “true” value are said to be…

  14. precise

  15. How many sig figs are in the following measurement: 0.0390060

  16. 6 sf

  17. Object A has a mass of 15.2 g and a volume of 3.6 mL. Object B has a volume of 4.1 mL and a mass of 16.8 g. Which will sink first in water?

  18. Object A (4.22g/mL vs. B= 4.10g/mL

  19. You are in the lab and need to mix hydrochloric acid and water. In what order should you do this?

  20. Pour acid into water

  21. Which subatomic particle has a mass so small that it is considered negligible when finding mass number?

  22. electron

  23. An unknown element has 38 protons, 36 electrons, and 50 neutrons. Identify the element.

  24. Always use protons for identity Strontium (*Sr2+)

  25. Isotopes occur when atoms of the same element have different mass numbers. Therefore, an isotope has the same # of ______, but a different # of ______.

  26. Same = protons Different = neutrons

  27. An atom has an atomic # of 31 and a mass # of 70. How many protons, electrons, and neutrons does the atom have?

  28. Protons = 31 Electrons = 31 Neutrons = 39

  29. What family has an electron configuration that ends in p5?

  30. Halogens

  31. What is the Noble Gas configuration for Tungsten?

  32. [Xe]6s14f145d5

  33. How many electrons can be held in each energy level (n=1, n=2, n=3, & n= 4) of the atom?

  34. n = 1  2e- (s) n = 2  8e- (s, p) n = 3  18e- (s, p, d) n = 4  32e- (s, p, d, f)

  35. Calculate the wavelength of a photon with an energy of 1.66x10-20 kJ.

  36. E = 1.66x10-17 J V = 2.5 x1016 Hz Wavelength = 1.2 x10-8 m

  37. Do metals generally form cations or anions?

  38. cations

  39. Give the group and period trend for atomic radius.

  40. Decreases across a period, increases down a column.

  41. What type of elements tend to form covalent/molecular bonds?

  42. 2 nonmetals

  43. Which molecule is nonpolar: BH3 or PH3?

  44. BH3

  45. According to VSEPR theory, what is the molecular geometry of the compound chlorine pentafluoride ?

  46. Square pyramidal

  47. What type of bond is likely to form between two atoms with the same electronegativity value?

  48. A nonpolar covalent bond

  49. When comparing single, double and triple covalent bonds, a single covalent bond has the ____ bond length and the _____ bond enthalpy.

  50. Single Covalent Bond Longest – bond length Lowest/weakest – bond enthalpy

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