Chemistry Test Review #1

Two iron blocks of equal size and mass are kept in contact with each other as shown in the figure. The block on the left side has been heated to 100C and placed in contact with the block on the right side which has been cooled to 0C. At thermal equilibrium, what would the temperture of the block measure on the left and right side?

• 75C,25C

• 50C,50C

• 100C, 0C

• 0C,0C

Tags

NGSS.HS-PS3-4

Would the reaction above be classified as an endothermic or exothermic reaction? Explain your answer.

• Endothermic because energy was released during the reaction

• Exothermic because energy was absorbed during the reaction

• Endothermic because energy was absorbed during the reaction

• Exothermic because energy was released during the reaction

Tags

NGSS.HS-PS3-4

NGSS.HS-PS1-4

Two objects are suspended on strings 1 meter apart inside of a vacuum chamber. When the atmosphere is removed from the chamber, there is essentially no matter between the two objects, yet heat is still transferred between them. This transfer of heat must be happening primarily through the process of

• convection

• conduction

• radiation

• refraction

Tags

NGSS.HS-PS3-4

At the start of the coal combustion experiment, the mass was 100 g. At the end of the coal combustion experiment, the mass was 100 g. During the combustion experiment, heat was transferred from the reaction vessel to the area surrounding the reaction vessel. What type of system was this combustion experiment conducted in?

• isolated

• insulated

• closed

• open

Tags

NGSS.HS-PS3-4

At the start of the coal combustion experiment, the combined mass of the coal and oxygen reactants was 100g. At the end of the coal combustion experiment, the mass of the sample was 100 g. Why does the scale showing the mass at the end of the reaction give a mass of 100g when there is only a small amoint of solid particles remaining on the scale?

• The mass of the oal particles remaining at the end of the experiment was 100g

• Additional oxygen was created during the combustion reaction

• Additional oxygen was created during the combustion reaction

• The mass if the carbon dioxide gas and other byproducts at the end of the experiment was 100 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these is the best example of heat transfer by radiation?

• butter melts on warm bread

• a ceiling fan cools a warm room

• puddles of water cool a warm tile floor

• a satelite is warmed by sunlight

Tags

NGSS.HS-PS4-3

A student learns that all of the particles within an object possess kinetic energy. Based on this fact, the student can conclude that all of the particles in the object

• are covalently bonded

• are hotter than their surroundings

• contain the same atoms

• are in motion

Tags

NGSS.HS-PS3-2

Heat flows from hotter objects to colder objects until it reaches a state where heat is no longer flowing. What have the objects reached when heat is no longer flowing?

• chemical equilibrium

• mechanical equilibrium

• thermal equilibrium

• stable equilibrium

Tags

NGSS.HS-PS3-4

Danielle, a student in a science class, has been asked to design an experiment to examine the process of thermal equilibrium. She places two objects that have the same mass but different initial tempertures in contact with each other. She records the final temperture in a table after the heat has been transferred.

What was Danielle's conclusion?

• the two objects of varying tempertures have reached thermal equilibrium and entropy is at its maximum

• the two objects of varying tempertures have reached thermal equilibrium and heat is at its maximum

• the two objects of varying tempertures have reached thermal expansion and entropy is at its minimum

• the two objects of varying tempertures have reached thermal expansion and heat is at its maximum

Tags

NGSS.HS-PS3-4

The table displays the temperature of substance A and substance B placed near eah other, but not touching, in a room at 25C. Temperature was taken at three time intervals. Which of the following statements best supports the data in the table?

• Energy was lost by substance A to the environment

• Both substances lost energy

• Energy lost by substance A was transferred to substance B

• Both substance gained energy

Tags

NGSS.HS-PS3-4