Mix It Up!
A combination of two or more materials that can be physically separated is called what?
A mixture.
What word describes a solution that contains as much dissolved material as possible?
Saturated.
In the number 36.472, what is the value of the digit 7?
0.07, or seven hundredths.
What fraction is equivalent to 3 ÷ 4?
3/4
A mixture contains 0.5 cup of gravel and 1.5 cups of water. What is the total volume of the materials in the mixture?
2 cups.
You have a mixture of gravel and water. What tool could you use to separate the gravel from the water?
A screen or strainer.
Two cups contain the same amount of water. Cup A has one spoonful of salt dissolved in it, and Cup B has three spoonfuls. Which solution is more concetrated?
Cup B.
Which is greater: 4.56 or 4.506?
Explain why.
4.56, because 6 hundredths have more value than 6 thousandths.
What is 2/3 of 12?
8
A student dissolves 1/6 cup of salt into each of 5 containers of water. How much salt did the student use altogether?
5/6 cup
A student mixes salt and water. After stirring, the salt seems to disappear. Did the salt actually disappear? Explain what happened.
No. The salt dissolved in the water and formed a solution.
A student adds salt to water one spoonful at a time. After several spoonfuls, some salt remains at the bottom even after stirring. What does this tell you about the situation?
The solution has reached saturation and cannot dissolve any more salt.
A student has $20.00 and spends $7.85. How much money does the student have left?
$12.15
A recipe uses 3/4 cup of flour for one bath. How much flour is needed for 2 batches?
1 1/2 cups.
Solution A contains 2 spoonfuls of salt in 100 mL of water. Solution B contains 3 spoonfuls of salt in 100 mL of water. How many more spoonfuls of salt would Solution A need to have the same concentration as Solution B?
1 additional spoonful.
A mixture contains gravel, salt, and water. Describe two steps you could use to separate the gravel and salt from the water.
First, use a screen/strainer to separate the gravel. Then evaporate the water to separate the salt from the solution.
Solution A contains 2 spoonfuls of salt in 100 mL of water. Solution B contains 4 spoonfuls of salt in 100 mL of water. Both completely dissolve. How does the concentration of Solution B compare with Solution A?
Solution B is twice as concentrated as Solution A.
A runner completes 3 laps of 1.25 miles each. How many miles does the runner travel altogether?
3.75 miles.
Five students equally share 4 granola bars. How much of a granola bar does each student receive?
4/5 of a granola bar.
A student makes 4 identical solutions using 0.75 liter of water in each. How much water is used altogether? If each solution contains the same amount of dissolved salt, will the four solutions have the same concentration?
3 liters of water, and yes, the solutions will have the same concentration.
A students says, "When salt dissolves in water, the salt is gone because we can't see it anymore." What evidence could you use to prove that the salt is still in the solution?
Evaporate the water. Salt will remain after the water evaporates, providing evidence that it was still present in the solution.
Two students add the same amount of salt to two cups. Cup A contains 50 mL of water, and Cup B contains 100 mL of water. All of the salt dissolves. Which cup has the more concentrated solution, and why?
Cup A, because the same amount of salt is dissolved in less water.
A class has 5 containers with 2.4 liters of water in each container. They use 3.75 liters of the water. How many liters remain?
8.25 liters.
A container holds 6 cups of water. Students use 2/3 of the water for an experiment. They divide the water they used equally among 4 small buckets. How many cups of water go into each bucket?
1 cup of water in each.
A student adds 1/2 cup of salt to each of 3 cups containing equal amounts of water. Only 1/3 cup of salt dissolves in each cup, and the rest remains at the bottom.
How much salt dissolved all together, and what does the salt remaining at the bottom tell you about each solution?
1 cup of salt dissolved all together, and the solutions have reached saturation.