May 24, 2015

Homework Help: Science

Posted by HELPMEASAP! on Tuesday, April 16, 2013 at 12:50pm.

1. Density is the relationship between ____. (1 point)
mass and volume
cubic centimeters and pounds
weight and volume
grams and mass

2. Which of the following is NOT a possible sign of a chemical change? (1 point)
a change in state
a change in color
the release of a gas
the release of energy

3. Which of the following is true about an object that floats in water? (1 point)
The object is less dense than frozen water.
The mass of the object is less than that of water.
The density of the object is less than that of water.
The volume of the water is greater than the objectís volume.

4. Three examples of physical change are ____. (1 point)
boiling water, a nail rusting, and a melting candle
a pond freezing, breaking glass, and a burning candle
melting ice, mowing the lawn, and carving a statue
applying lipstick, making lemonade, and baking bread

5. Suppose a customer brings a gold bracelet to a jeweler and asks for it to be changed into a gold ring. Which of the following is true? (1 point)
The physical property of color will be changed.
The bracelet will go through a chemical change.
The composition of the bracelet will change.
The shape of the gold will change physically.

6. Which of the following explains how water causes rocks to weather? (1 point)
Water can melt rock material.
Water freezes in the cracks and expands, causing breaks.
Water reacts with the rock and produces gases.
all of the above
7. How can you tell that the fireworks exploding during a Fourth of July display do not all contain the same ingredients? (1 point)
different colors of explosions
different shapes of explosions
different timing of explosions
all of the above
8. Which of the following explains why the chemical products from a reaction have a different mass than the chemicals at the beginning? (1 point)
The products are heavier and sink.
The products are lighter and rise.
The products are a gas and escape into the air.
The products are a solid and have more mass.
Fill in the Blank9. The main difference between physical and chemical changes is that _______ changes are not reversible. (1 point)

Note: Your teacher will grade your response to ensure you receive proper credit for your answer.10. Explain how color can be classified as both a physical property and as one indication of a chemical change. (3 points)

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