Mixtures
What is the definition of a mixture?
A combination of two or more substances that can be easily separated using tools and methods.
A 5th grade student placed a sugar cube in a beaker of water. The student observed how the sugar cube sank to the bottom of the beaker. The student then stirred the water until the sugar cube was no longer visible.
Is the sugar cube more dense or less dense than the water before stirring?
more dense
How do you separate a saltwater solution?
Charles is creating solutions with liquids in an experiment. He mixes water and lemon juice in a cup to create a liquid solution.
Which method can Charles use to prove that matter was conserved in the solution of water and lemon juice?
A. Subtracting the masses of each liquid before they were combined and adding the mass of the combined liquids
B. Comparing the masses of each liquid before they were combined and the mass of the combined solution
B
The ingredients in a mixture _________ their physical properties.
maintain
A. The volume increases when the lemon juice is added to the water.
B. The volume decreases when the lemon juice is added to the water.
C. The volume stays the same when the lemon juice is added to the water.
A - volume increases
A plastics recycling plant recycles drinking bottles that are made from two different types of plastic. Which physical property could be used to separate and compare the different types of plastic?
Size, Shape, Density, or Solubility
Which physical property of matter is used to prove that matter is conserved when two or more substances are combined?
Mass, Density, or Volume
Mass
Which tool would you use to separate a mixture of noodles and water?
strainer/colander
A 5th grade student placed a sugar cube in a beaker of water. The student observed how the sugar cube sank to the bottom of the beaker. The student then stirred the water until the sugar cube was no longer visible.
What happened to the particle size of the sugar once it dissolved in the water?
They became smaller to make them appear to disappear.
Which mixture can be separated using a magnet?
A. iron nails and staples
B. plastic bottle cap and gold ring
C. iron filings and sand
C
A student combines 400 grams of chicken and 150 grams of noodles to make some soup.
What is the total mass of the mixture?
550 grams
TRUE OR FALSE: To separate a mixture of uncooked rice and dry beans, you would use a filter.
FALSE, because both ingredients would remain unseparated in the filter.
Which of the following would make substances dissolve faster in water?
Adding heat or removing heat
Adding heat
Which tool would be BEST to use to separate sand and water?
A. filter
B. strainer
C. tweezers
filter
15 grams of ground coffee is mixed evenly with 150 mL of water. The mass of the ground coffee will _______ after mixing it with water, proving that the matter is conserved.
A. Stay the same
B. Decrease
C. Increase
A. Stay the same
Oil and water is an example of a simple mixture because oil is insoluble and _____ _______ than water.
less dense
A person heats 500 mL of water in a beaker. Then the person stirs 10 grams of table sugar into the water. Which property will the sugar keep after it has dissolved in the water?
Grainy Texture, Whitish Color, Temperature, or Sweetness
Sweetness
A student made a mixture that included water, salt, sand, and iron filings.
Identify the steps (in order from most easily separated to least easily separated) to separate the mixture.
HINT: 3 steps
FIRST, remove the iron filings using a magnet.
NEXT, use a filter to remove the sand.
LAST, boil the water to evaporate the liquid, leaving the salt behind.
The law of conservation of matter states that matter can not be __________ or ___________.
created or destroyed