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Unit 4 Summative Test: Physical and Chemical Changes

Last updated over 3 years ago
14 questions
Required
2

Match the item to the correct category of a physical change or chemical reaction.

  • Mixing Ba(OH)2 and NH4Cl and an unexpected odor occurring.
  • Salt dissolving in water.
  • A bicycle chain rusting.
  • Adding blue food coloring to water and it turning blue.
  • physical change
  • chemical change/reaction
Required
1

Which of the following images best represents a solid?

Required
1

Determine the change in temperature:

Ms. Ackerman places 12 grams of sodium chloride into 30 mL of water at 27 degrees Celsius. After 30 seconds the temperature of the water is now 18 degrees Celsius.

Change in temperature = final temp - initial temp

Required
1

How many oxygen (O) atoms are represented in the following chemical formula?

Required
1

The following equation is unbalanced:




Which of the following reaction equations is properly balanced?

Required
2

The following reaction is unbalanced: Balance the reaction and then draw a model of the reaction. Be sure to include a key in your model:


Required
1

Which of the following best describes an endothermic reaction?

Required
1

Which of the following best describes an exothermic reaction?

Required
1

This is a reaction coordinate diagram for a chemical reaction. What kind of reaction is represented by this diagram?

Required
2

When you get a muscle or joint injury, often you will place an ice pack on the injury. Ice packs work by mixing two room temperature substances in a bag. When those substances mix, they produce a cold temperature.

Is this an endothermic or an exothermic reaction? Explain your answer.

Be sure to include the definition of an endothermic or exothermic reaction in your answer

Required
2

Using the blank diagram, draw a reaction coordinate diagram for an endothermic reaction.

Label the start or the reaction, end of the reaction, and the point where maximum potential energy is reached.

Required
1

In an exothermic reaction, the temperature of the system will...

Required
2

Determine the enthalpy change of the following reaction

Required
3

Determine the enthalpy change of the following reaction. Then, state whether the reaction is exothermic or endothermic.