Physical Science Final

Which transformation of energy occurs when a fan is turned on and the blades start to rotate?

• thermal energy to kinetic energy

• electrical energy to kinetic energy

• thermal energy to potential energy

• electrical energy to potential energy

The table below shows the properties of four samples of sugar. Which sample of sugar will dissolve most rapidly in water?

• Sample W

• Sample X

• Sample Y

• Sample Z

A substance is classified as an electrolyte because

• its aqueous solution conducts an electric current.

• it has a high melting point.

• its aqueous solution has a pH value of 7.

• it contains covalent bonds.

The table below shows the color of three indicators at different pH values.

- The unknown liquid turns litmus paper blue

- The unknown liquid turns pink when tested with phenolphthalein

- The unknown liquid turns blue when tested with cabbage juice

What is the pH of the unknown solution?

• 2

• 6

• 10

• 12

Predict what would happen if you drink a basic solution like Alka-Seltzer for your upset stomach.

• It changes the function of your stomach.

• It cleanses the stomach.

• It lowers the pH of the acid in the stomach.

• It raises the pH of the acid in the stomach.

The graph shows a solubility curve of a soluble substance. What is the maximum amount of the substance that will dissolve in 100 cm³ of water at 30°C?

• 25 g

• 33 g

• 57 g

• 125 g

Read the following passage about Evan:

Evan has a black car, and it gets very hot inside the car on a hot summer day. Evan wants to cool his car down as quickly as possible so he can be cool on his drive home from school. How could Evan position his air conditioner vents to best cool down his car?

• up because convection causes cold air to sink and hot air to rise

• up because conduction causes cold air to sink and hot air to rise

• down because convection causes cold air to rise and hot air to sink

• down because conduction causes cold air to rise and hot air to sink

A cup of hot chocolate has a spoon in it. How does the heat move from the hot chocolate to the metal spoon handle?

• It moves through conduction, because heat is transferred directly from the hot chocolate to the spoon.

• It moves through convection, because heat is transferred directly from the hot chocolate to the spoon.

• It moves through conduction, because heat is transferred through density differences.

• It moves through convection, because heat is transferred through density differences.

Which statement is the best example of the law of conservation of energy?

• A train traveling down a hill loses potential energy that is then stored in the ground.

• An animal's energy is permanently stored in chemical bonds when it eats food.

• Chemical energy in a car engine is destroyed as it burns and releases exhaust into the air.

• Radiant energy from the Sun is not lost but transformed into other forms of energy.

When baking a cake, why are cake pans made out of metal?

• Metal conducts heat very well.

• Metal makes the cake taste better.

• Another material would melt in the oven.

• Another material would be too heavy to use.