Physical/Chemical Changes
When a tree dies it begins to decay and break down. This is an example of a _____ change.
Physical or Chemical?
Chemical change.
Change in odor, forming of bubbles, new substance, decaying matter, change in color
Some students want to test how light affects the growth of seedlings. They must decide which method they will use to conduct this investigation. Which of the following should they perform?
a. get books from the library about how to grow plants
b. observe the seedlings and plants in the school yard
c. set up a controlled experiment using a lamp and a dark place
d. set up a number of plants in different windows in the classroom
c. set up a controlled experiment using a lamp and a dark place
Which of these classroom objects would be attracted to a magnet?
A. Eraser
B. Pen
C. Crayon
D. Paper Clip
D. The paper clip
Andrew sniffs a cup of coffee, a garbage can, and a perfume bottle. What property is he observing?
A. Color
B. Odor
C. Texture
D. Hardness
B. Odor
Which form of energy is related to the temperature of an object?
A) thermal energy
B) sound energy
C) chemical energy
D) electrical energy
A) thermal energy
Boiling water is an example of physical or chemical change?
Physical – the water changed form/state, but there are no new properties. It is still water.
Students are choosing a tree to use for a wildlife project to attract insects. The students use observations to help them decide which tree to choose for the project. Which of these questions can be answered through scientific investigation?
A. Which tree has the prettiest leaves?
B. Which tree has the biggest flowers?
C. Which tree has flowers that smell the best?
D. Which tree has leaves with the best shape?
B. Which tree has the biggest flowers?
Remi tests some objects with a magnet. The magnet attracts some objects, but not others. What can Remi conclude about the objects that the magnet attracts?
Ⓐ They are made of plastic.
Ⓑ They are not made of metal.
Ⓒ They are made of soft materials.
Ⓓ They are made of some metals.
Ⓓ They are made of some metals.
Which two tools could be used to measure the volume of a rock?
A. ruler
B. Scale
C. tape measure
D. graduated cylinder
D. graduated cylinder
Karen and Matt list several devices they use every day in their home. Here are five objects on their list:
computer
toaster
lamps
microwave oven
hair dryer
What do the five objects have in common?
A) All are useful because they release the same form of energy.
B) All use electricity and change it into another form of energy.
C) All are useful whether or not they release energy.
D) All are useful whether or not they use electricity.
B) All use electricity and change it into another form of energy.
Which is an example of a chemical change?
A. Boiling water
B. Burning a log
C. Breaking a crayon
D. Bending a paperclip
D. Burning a log is a chemical change.
Pauline and Manuel are experimenting to find out how far a ball travels when launched from a slingshot. Which of the following would BEST help share the result of their investigation?
Ⓐ writing a procedure for their experiment
Ⓑ recording the distance the ball traveled each time.
Ⓒ experimenting with different balls and slingshots
Ⓓ observing the ball as it lands and rolls on the ground
Ⓑ recording the distance the ball traveled each time.
True or False?
Two magnets have to touch each other to make them attract or repel.
False. Magnets do not have to touch.
What property of matter is the following sentence describing?
A diamond can scratch a piece of glass.
A. Volume
B. Mass
C. Texture
D. Hardness
D. Hardness
Which states of matter do sound waves travel through?
A) solids
B) liquid
C) gases
D) solids, liquids, and gases
D) solids, liquids, and gases
Chris loves to make fruit salad. He slices up some apples, bananas, and grapes. As he eats it, his stomach acid begins to break down and digest his food. He leaves the leftovers out for his brother, but the apples turn brown.
Which of these is an example of a physical change?
A. Slices fruit
B. Eats the food
C. Apple Turns brown
A. Slices fruit
When Chris slices up the fruit, that is an example of a physical change.
Four students are each conducting an experiment in science class. Three of the students all get similar results. Greg, the fourth student, has results that are very different from the others.
Which of the following best describes why Greg had such different results?
A. Greg did not follow proper safety procedures.
B. Greg followed a different procedure than instructed.
C. Greg did his experiment in a different part of the lab.
D. Greg did the experiment correctly, and the other students did not.
B. Greg followed a different procedure than instructed.
Taylor put the North side of one magnet near the South side of another magnet. What happened next?
A. They pulled together because the north and south repel each other
B. They pulled together because the north and south attract each other
C. They pushed away because the north and south repel each other
C. They pushed away because the north and south attract each other
B. They pulled together because the north and south attract each other
Stephanie measured the amount of water in a graduated cylinder and found it to be 15 mL. She placed a golf ball in the water, and it sank to the bottom of the cylinder. The volume of the water with the golf ball in it was 24 mL. What is the volume of the golf ball?
9 mL
A scale is a set of eight notes in order from low frequency to high frequency. Mrs. Lester plays a scale on the piano. All the notes are equally loud. Which change occurs to a property of the piano’s sound?
A) The pitch increases.
B) The pitch decreases.
C) The speed of the sound waves increases.
D) The speed of the sound waves decreases
A) The pitch increases.
Joy is making bread. First, she mixes the flour, sugar, and water. Then, she breaks the eggs. Next, she kneads the dough into different shapes. Finally, she bakes the bread in the oven.
Which step is an example of a chemical change?
A. Mixing flour, sugar, & water
B. Kneading the dough
C. Baking the bread in the oven
C. Baking the bread in the oven is a chemical change.
Four students are conducting an experiment about how the temperature of water affects the rate at which a sugar cube will dissolve.
• Marta sets up four beakers with water of different temperatures.
• Calib measures the temperature of each beaker.
• Terese places the cubes in the beakers and records the time they take to
dissolve.
• Anton records the data and writes a conclusion.
Which student is analyzing the results of the experiment?
A. Anton c. Marta
B. Calib d. Terese
A. Anton
Mandy used a magnet to test different types of metal items around her house.
Copper Penny - not attracted
Aluminum Foil- not attracted
Iron pan- attracted
Steel Can- attracted
Gold ring- not attracted
What can Mandy conclude about types of metal?
A. All metals are attracted to magnets
B. Not all metals are attracted to magnets
C. The magnet did not work
D. The magnet was not strong enough
B. Not all metals are attracted to magnets
Luis knows that the mass of one marker is 3 grams. The marker box is 1 gram. How much is the mass of the entire box of 10 markers?
A. 10 Grams
B. 13 Grams
C. 31 Grams
D. 7 Grams
C. 31 Grams
Tyler is playing the guitar. Each string that Tyler plucks makes a sound of a different pitch. What determines the pitch of each sound?
A) the speed that the string vibrates
B) the position of the string on the guitar
C) the speed that the string moves across the guitar
A) the speed that the string vibrates