Physical Science Georgia Milestones

What happens during a physical change?

• new substances are formed

• the identity of the substance is changed

• a chemical reaction occurs

• the form of a substance changes but not its identity

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S8P1cd A sample of aluminum has a volume of 3.0 cm³ and a mass of 8.1g. Which is the density of aluminum?

• 2.7 g/cm³

• 5.1 g

• 11.1 cm³

• 24.3 g/cm³

Look at the incomplete chemical equation: Ca + Cl₂ --> ?

The reactants are shown. How many chlorine (Cl) atoms must be present in the product that forms this reaction?

• 1

• 2

• 3

• 4

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During a chemical reaction, methane (CH₄) and oxygen (O₂) combine to produce carbon dioxide (CO₂) and water (H₂O). The balanced chemical equation identifies the reactants and products for this reaction, along with some of their masses.

CH₄ + 2O₂ --> CO₂ + 2H₂0

16g + ? --> 44g + 36 g

Which mass of oxygen (O₂) is required for this reaction to occur?

• 16 g

• 36 g

• 44 g

• 64 g

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What is the runner's average speed?

• 1/4 m/s

• 4 m/s

• 10 m/s

• 40 m/s

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If the runner continues at the same speed, how far will the runner travel in 30 seconds?

• 7.5 meter

• 40 meters

• 80 meters

• 120 meters

S8P3b A rocket is traveling through the atmosphere at a constant velocity. Which of the following is true?

• The rocket's engine is producing an unbalanced force that keeps the rocket in the air.

• All the forces acting on the rocket are balanced

• The rocket exerts a greater force on its exhaust gases than the gases exert on the rocket

• The rocket is moving, so some net force must be acting on it

Two objects move away from each other. What happens to the gravitational attraction between them?

• It decreases

• It increases

• It becomes zero

• It does not change

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Which of the following is evidence that a magnetic field surrounds a magnet?

• When a paper clip is placed on a bar magnet, it sticks to the magnet

• When the north poles of two magnets are brought near each other, they push apart without touching

• When a magnet is placed on a metal surface, it sticks to the surface.

• When you touch a metal doorknob, sometimes you receive a shock

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A magnet sticks to a table leg. Based on this information, which material could the table leg be made of?

• iron

• wood

• copper

• aluminum

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