Chemical or Physical Change
Physical or Chemical Change?
crumpling aluminum foil into a ball
physical change
At what temperatures is water a gas?
a. below 0 degrees Celsius
b. above 100 degrees Celsius
c. between 0 and 100 degrees Celsius
d. between o and 120 degrees Celsius
b. above 100 degrees Celsius
A chemical change creates a _________.
a. change in volume
b. new substance
c. mixture
d. solution
b. new substance
Which is NOT an example of condensation?
A. Dew is found on the grass on a summer morning
B. Drops of water form on a cold can of soda on a hot day.
C. A bucket of water left uncovered eventually becomes empty.
D. The walls of a bathroom are damp after someone takes shower.
C. A bucket of water left uncovered eventually becomes empty.
Colton and his brothers put some raisins, hazelnuts, almonds, and peanuts in a bowl to make a snack for their movie. What does this snack represent?
a. a solution
b. a new element
c. a new compound
d. a mixture
d. a mixture
Physical or Chemical Change?
baking a loaf of bread
Chemical Change
Matter be a gas, solid, or liquid. It can change from one state to another. Which change most often causes matter to change state?
a. change in mass
b. change in color
c. change in volume
d. change in temperature
d. change in temperature
Why is it important to measure very carefully in an investigation?
a. to practice measuring skills
b. to keep good records
c. so others can replicate the work
d. to test the accuracy of our tools
c. so others can replicate the work
Andrea created a solution by adding food coloring to water. Her solution is also a mixture. Which of these is true of all solutions?
a. They are all liquids.
b. They all include water.
c. The parts of all solutions are evenly mixed.
d. The substances are always permanently combined.
c. The parts of all solutions are evenly mixed.
Reggie has a sample of raw sugar made up of large particles and a sample of white sugar made up of much smaller particles. He dissolved 1 tsp of each sample in 1 cup of water. Which dissolved fastest?
a. Both dissolved at the same rate.
b. The white sugar dissolved slowly, and the raw sugar dissolved quickly.
c. The white sugar dissolved quickly, and the raw sugar dissolved slowly.
d. The white sugar dissolved quickly, and the raw sugar did not dissolve.
c. The white sugar dissolved quickly, and the raw sugar dissolved slowly.
Physical or Chemical Change?
Burning Leaves
Chemical Change
What is the best way to separate a mixture of sugar, sand, and water?
a. Freeze the mixture, causing the water to be destroyed, then sift the sugar from the sand.
b. Filter the sand from the sugar and water, then heat the mixture, causing the water to evaporate.
c. Filter the mixture, causing the sugar and sand to get caught but not the water.
d. Stir the mixture, causing the water to move above the sugar and sand.
c. Filter the mixture, causing the sugar and sand to get caught but not the water.
Ava performed an investigation. Then Matthew repeated the same investigation. What is the best reason for Matthew to repeat it?
a. to write the same report
b. to practice the experiment
c. to come to the same conclusion
d. to be sure the observations are accurate
d. to be sure the observations are accurate
Heidi combined lettuce, tomatoes, cucumbers, and shredded cheese to make a salad. Which best describes what Heidi made?
a. combination
b. element
c. mixture
d. solution
c. mixture
A pot contains a mixture.
A boiling pot can be used to separate what type of mixture?
a. a solution, such as salt water
b. a mixture of particles with different densities
c. a mixture of particles of different sizes, such as seashells and sand
d. a mixture of steel, which is magnetic, and aluminum, which is not magnetic
a. a solution, such as salt water
Wilson made a list of activities that involve a chemical change. Which of these changes should be included on his list?
a. ringing a bell
b. making ice cubes
c. picking up rocks
d. making pancakes
d. making pancakes
What are the three states of matter?
solids, liquids, and gas
Taylor put the same amounts of water, sugar, and yeast into three balloons. Then she put each one in a place with a different temperature and observed the changes. If someone wanted to repeat. Taylor’s experiment, what other information would they need?
a. the mass of each balloon and what was in it
b. the temperature where each balloon was placed
c. the size of the table where each balloon was placed
d. the total mass of all the balloons and what was in them
b. the temperature where each balloon was placed
A company collects cans for recycling. Some cans are made of aluminum, and others are made of steel. Which of the following is the best way to separate the mixture of the two types of cans?
a. by size
b. by shape
c. by magnetism
d. by evaporation
c. by magnetism
DeShawn has to dissolve salt crystals in the water. What would be the best thing to do to help the crystals dissolve quickly?
a. heat the salt crystals
b. crush the salt crystals
c. cool the water in the tank
d. use the largest salt crystals
b. crush the salt crystals
Which of the following represents a physical change?
a. burning a candle
b. making toast
c. melting ice
d. popping popcorn
c. melting ice
The rails on a railroad track have small gaps between sections of metal rails. Why are these gaps needed?
a. They allow the metal to expand when it is heated without bending the rails
b. They allow the metal to expand when it is cooled without bending the rails
c. they keep the rails from touching and reacting with one another.
d. They help chemical reactions between the rails and air happen faster.
a. They allow the metal to expand when it is heated without bending the rails
Which term describes when a substance is changed from a liquid to a gas?
a. Condensation
b. Filtration
c. Evaporation
d. Precipitation
c. Evaporation
Atoms are made up of smaller particles called subatomic particles. Which is a subatomic particle that has no charge?
a. electron
b. nucleus
c. neutron
d. proton
c. neutron
Destiny is making a nutrient solution to use in her garden. She places the powder in a watering can. Then she adds the water. Which action would be the reasoning for the powder to dissolve fastest?
a. shaking the can vigorously
b. stirring the solution slowly
c. tilting the can carefully from side to side
d. setting the can down and leaving it alone
a. shaking the can vigorously