Posted by NIKE on Tuesday, April 17, 2012 at 1:33pm.
1.chemical change
Sorry thats all I know!
ur a cheater from a school
1.
Density is the relationship between ____. (1 point)
Correct answer (1 pt) mass and volume
Unselected Answer (0 pts) cubic centimeters and pounds
Unselected answer (0 pts) weight and volume
Unselected answer (0 pts) grams and mass
1 /1 point
2.
Which of the following is NOT a possible sign of a chemical change? (1 point)
Correct answer (1 pt) a change in state
Unselected answer (0 pts) a change in color
Unselected answer (0 pts) the release of a gas
Unselected answer (0 pts) the release of energy
1 /1 point
3.
Which of the following is true about an object that floats in water? (1 point)
Unselected answer (0 pts) The object is less dense than frozen water.
Unselected answer (0 pts) The mass of the object is less than that of water.
Correct answer (1 pt) The density of the object is less than that of water.
Unselected answer (0 pts) The volume of the water is greater than the object’s volume.
1 /1 point
4.
Three examples of physical change are ____. (1 point)
Unselected answer (0 pts) boiling water, a nail rusting, and a melting candle
Unselected answer (0 pts) a pond freezing, breaking glass, and a burning candle
Correct answer (1 pt) melting ice, mowing the lawn, and carving a statue
Unselected answer (0 pts) applying lipstick, making lemonade, and baking bread
1 /1 point
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)
Unselected answer (0 pts) The physical property of color will be changed.
Unselected answer (0 pts) The bracelet will go through a chemical change.
Unselected answer (0 pts) The composition of the bracelet will change.
Correct answer (1 pt) The shape of the gold will change physically.
1 /1 point
6.
Which of the following explains how water causes rocks to weather? (1 point)
Unselected answer (0 pts) Water can melt rock material.
Correct answer (1 pt) Water freezes in the cracks and expands, causing breaks.
Unselected answer (0 pts) Water reacts with the rock and produces gases.
Unselected answer (0 pts) all of the above
1 /1 point
7.
How can you tell that the fireworks exploding during a Fourth of July display do not all contain the same ingredients? (1 point)
Unselected answer (0 pts) different colors of explosions
Unselected answer (0 pts) different shapes of explosions
Unselected answer (0 pts) different timing of explosions
Correct answer (1 pt) all of the above
1 /1 point
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)
Unselected answer (0 pts) The products are heavier and sink.
Unselected answer (0 pts) The products are lighter and rise.
Correct answer (1 pt) The products are a gas and escape into the air.
Unselected answer (0 pts) The products are a solid and have more mass.
1 /1 point
Fill in the Blank
9.
The main difference between physical and chemical changes is that _______ changes are not reversible. (1 point)
Correct answer (1 pt) chemical
(0 pts) physical
1 /1 point
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