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Chemistry, 15.10.2019 08:50 anggar20

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1.a student compares the boiling point of substances having different intermolecular forces. which scientific problem is the student most likely investigating?
a) is boiling point affected by the strength of particle attraction?
b) is boiling point correlated to melting point?
c) is boiling point affected by the mass of the sample?
d) is boiling point the temperature at which a substance changes it’s state?

2. the table compares the characteristics of a substance in three different states of matter. which of these best describes the states of the substance represented by state z?
a) it is a solid because strong attractive forces prevent particles from moving
b) it is a liquid because strong attractive forces prevent particles from moving
c) it is a liquid because of weak attractive forces allow for some motion
d) it is a gas because weak
attractive forces allow for some motion

3. which of the following could result from a substance that undergoes a physical change ?
a) it changes irreversibly
b) it undergoes phase change
c) it’s elemental composition is altered
d) it’s atom rearrange to form a new molecule

4. which of the following shows examples of things that converts chemical energy to mechanical energy ?
a) toaster and fan
b) fan and microwave oven
c) airplane and human body
d) microwave oven and blender

5. compare the type of change that occurs when a substance melts and when a substance is set on fire. use complete sentences to justify the type of change that occurs.

6. chemist is designing an experiment to investigate the fact of temperature on the rate of a chemical change . so just a suitable hypothesis for the experiment . also list the dependent independent and controlled variables that can exist in such an investigation .

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1.a student compares the boiling point of substances having different inter...

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