HSAB CH 1010 Ex1

Which statement is true?

• Bond formation is exothermic and bond breaking is endothermic

• Bond formation is endothermic and bond breaking is exothermic

• Both bond formation and bond breaking are exothermic

• Both bond formation and bond breaking are endothermic

Tags

NGSS.HS-PS1-4

A structural representation of caffeine is shown; what is the molecular formula of this compound?

Tags

NGSS.HS-LS1-6

 Predict whether each of the following is an ionic compound or molecular compound

PF3, ZnS, SiCl4, SO2

• molecular, ionic, molecular, molecular

• molecular, molecular, ionic, ionic

• ionic, ionic, molecular, ionic

• molecular, ionic, ionic, molecular

How many moles of carbon dioxide CO2 are present in 75.3 g?

 What is the percent composition of nitrogen in ammonium nitrate NH4NO3?

What is the empirical formula of a substance which is 58.0% carbon, 7.6% hydrogen and 34.4% oxygen?

• C6H8O4

• C9H14O4

• C14H9O4

• C8H14O2

Arrange the following by increasing melting point: Na2O, N2O, Li2O

• Na2O < N2O < Li2O

• N2O < Na2O < Li2O

• Li2O < N2O < Na2O

• Equal melting points

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Arrange by increasing carbon-oxygen bond dissociation energy

• methanol, formaldehyde, carbon monoxide

• formaldehyde, methanol, carbon monoxide

• carbon monoxide, methanol, formaldehyde

• formaldehyde, carbon monoxide, methanol

Tags

NGSS.HS-PS1-4

How many resonance structures can be drawn for SO3

• 0

• 2

• 9

• 7

Evaluate NF3 as one of the following:

• It has polar bonds and is a polar molecule.

• It has polar bonds but is not a polar molecule.

• It has non-polar bonds but is a polar molecule.

• It has non-polar bonds and is a non-polar molecule.