Physical Science Final Review

Front

Which compound will most likely be formed when lithium (Li) and nitrogen (N) are chemically combined? Options: LiN, Li₃N, LiN₃, Li₃N₃

Back

Li₃N

Front

This graph represents the cooling curve for a pure substance in a liquid state at t=0 min. Why does temperature remain constant from when t = 2 min to when t = 5 min?

Back

because heat energy is released from the substance as it changes from a liquid to a solid

Front

This diagram represents a closed series circuit. What would happen if the voltage were doubled?

Back

The current would double.

Front

How would decreasing the diameter of the wires in a circuit influence the resistance and flow of electrons in the circuit?

Back

It would increase the resistance, causing fewer electrons to flow through the circuit.

Front

How could the strength of an electromagnet be increased? Options: by reducing the length of the core of the electromagnet, by using rubber material as the core for the electromagnet, by decreasing the amount of current in the electromagnet, by increasing the number of coils in the wires of the electromagnet

Back

by increasing the number of coils in the wires of the electromagnet

Front

This diagram represents a neutral atom of fluorine-19. Which best describes the structure of fluorine-19?

Back

2 electrons in the first energy level; 7 electrons in the second energy level

Front

Which equation represents a decomposition chemical reaction? Options: 2S + 3O₂ → 2SO₃, 2NaCl → 2Na + Cl₂, 2K + 2H₂O   → 2KOH + H₂, Zn + 2HCl →      ZnCl₂ + H₂

Back

2NaCl → 2Na + Cl₂

Front

When is work done on an object? Options: when a force is applied to an object and the object remains stationary, when a force is applied to an object and the object moves in the same direction as the force, when the frictional force on an object is greater than a force applied to the object, when two forces of equal magnitude are applied to the object in opposite directions

Back

when a force is applied to an object and the object moves in the same direction as the force

Front

This diagram represents a closed circuit with three identical lightbulbs. If bulb Y stops working in the circuit, what will happen to bulbs X and Z?

Back

Bulb X and bulb Z will glow.

Front

This unbalanced equation represents a chemical reaction:
HgO → Hg + O₂
Which is the correctly balanced chemical equation for this reaction?

Back

2HgO → 2Hg + O₂