+Final Exam Review - Part 2

How many significant figures does the following number have?
0.00345

• 6
• 5
• 3
• Ambiguous: 3,4,5, or 6

Round 1289 to three significant figures

• 1290
• 130
• 1300
• 1289.0

648 g = ____ mg

• 6,480

• 64,800

• 648,000

• 64.8

THE SUBSTANCE THAT CAN BE SEPARATED BY PHYSICAL METHODS

• ELEMENTS

• COMPOUNDS

• MIXTURES

Which technique would you use to separate salt that has dissolved in water?

• filtration

• screening

• evaporation

• centrifugation

What electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵
• 1s²2s²2p⁴
• 1s²2s²2p⁶
• 1s²2s²2p⁶3s²3p⁶4s²3d¹

Tags

NGSS.HS-PS1-1

What is the electron configuration for Manganese?

• 1s²2s²2p⁶3s²

• 1s²2s²2p⁶3s²3p⁶4s²4d⁵

• 1s²2s²2p⁶3s²3p⁶4s²3d⁵

• 1s²2s²2p⁶3s²3p⁶4s²4d¹⁰

Tags

NGSS.HS-PS1-1

How many total valence electrons are in a molecule of CO₂?

• 8

• 12

• 16

• 20

What explains the very high melting and boiling point of water

• Strong dipole-dipole bonds between water molecules
• Strong hydrogen bonds between water molecules
• Dispersion forces which are present in all molecules
• Asymmetrical shape of the polar bonds.

Which of the following will NOT have hydrogen bonding?

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• 
• 
•