Mixtures Quiz For Grade 7 Student
Grade 7 mixtures
Questions and Answers
- 1.
A mixture is ...
- A.
A pure substancae
- B.
Two or more substances mixed together
Correct Answer
B. Two or more substances mixed togetherExplanation
The correct answer is "Two or more substances mixed together." This is because a mixture is a combination of two or more substances that are physically combined but can be separated through physical means, such as filtration or evaporation. Unlike a pure substance, which consists of only one type of particle, a mixture contains different types of particles that retain their individual properties. Therefore, the answer accurately describes the nature of a mixture.Rate this question:
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- 2.
Mixtures can be classified into 2 types, homogeneous and heterogenous. They are different because
- A.
Heterogenous has 2 substances. Homogenous has 3 or more substances
- B.
Homogeneous looks the same throughout, with heterogenous you can see the different parts
- C.
Heterogeneous looks the same throughout, with homogeneous you can see the different parts
- D.
They are the same, just different names
Correct Answer
B. Homogeneous looks the same throughout, with heterogenous you can see the different partsExplanation
The correct answer is that homogeneous mixtures look the same throughout, while heterogeneous mixtures allow you to see the different parts. This explanation highlights the key difference between the two types of mixtures based on their visual characteristics. In a homogeneous mixture, the substances are uniformly distributed and cannot be visually distinguished, whereas in a heterogeneous mixture, the substances are not evenly mixed and can be observed as separate components.Rate this question:
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- 3.
Another name for homogeneous is
- A.
Solution
- B.
Solvent
- C.
Solute
- D.
Saline
Correct Answer
A. SolutionExplanation
Homogeneous refers to a substance that has a uniform composition throughout. A solution is a type of homogeneous mixture where one substance, called the solute, is dissolved in another substance, called the solvent. Therefore, solution is another name for homogeneous because it describes a mixture that is uniform in composition. Solvent, solute, and saline are not synonymous with homogeneous, as they refer to specific components or types of mixtures.Rate this question:
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- 4.
To separate a mixture of sand and iron it is easiest to use
- A.
Floating
- B.
Picking them out
- C.
A magnet
- D.
Filter with filter paper
Correct Answer
C. A magnetExplanation
To separate a mixture of sand and iron, the easiest method is to use a magnet. Since iron is magnetic, the magnet will attract the iron particles, allowing them to be easily separated from the sand. This method is efficient and does not require any additional equipment or chemicals. By using a magnet, the iron can be quickly and effectively isolated from the mixture, resulting in a successful separation process.Rate this question:
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- 5.
Solutions are made of at least 2 parts called
- A.
Solution and solute
- B.
Solute and solvent
- C.
Solvent and saline
- D.
Solution and solvent
Correct Answer
B. Solute and solventExplanation
A solution is a homogeneous mixture composed of at least two parts: solute and solvent. The solute is the substance that gets dissolved in the solvent, while the solvent is the substance that does the dissolving. In other words, the solute is the component that is present in a smaller amount and is being dissolved, while the solvent is the component that is present in a larger amount and does the dissolving. Therefore, the correct answer is "solute and solvent."Rate this question:
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- 6.
I'm making soup for lunch. Which would be faster, rock salt or regular table salt?
- A.
Rock salt
- B.
Table salt
Correct Answer
B. Table saltExplanation
table salt is smaller than rock salt. Since they are the same substance (salt), the only difference is the size of the particle. From your experiment with powdered sugar and the sugar cube, you know that smaller particle sizes dissolve faster than larger particle sizes.Rate this question:
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- 7.
What else can I do to make the salt in my soup dissolve faster?
- A.
Add a lot of table salt
- B.
Stir
- C.
Add heat
- D.
Let it sit
Correct Answer(s)
B. Stir
C. Add heatExplanation
both stirring and adding heat will help the salt dissolve faster. Letting it sit, the salt would eventually dissolve, but it would be slower. Adding more salt would only mean there is more salt to dissolve.Rate this question:
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- 8.
Which of the following are homogeneous mixtures?
- A.
Water
- B.
Rocky road ice cream
- C.
Shampoo
- D.
Oatmeal
Correct Answer(s)
A. Water
C. ShampooExplanation
Homogeneous mixtures are those in which the components are evenly distributed throughout the mixture, resulting in a uniform appearance and composition. Water and shampoo are examples of homogeneous mixtures because their components (water and various chemicals) are evenly mixed together, resulting in a uniform solution. On the other hand, rocky road ice cream and oatmeal are not homogeneous mixtures because they contain distinct components that are not evenly distributed throughout the mixture.Rate this question:
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- 9.
Which of the following are mechanical mixtures?
- A.
Chocolate bar with almonds
- B.
Chocolate milk
- C.
Flat pop
- D.
Orange juice with pulp
Correct Answer(s)
A. Chocolate bar with almonds
D. Orange juice with pulpExplanation
Mechanical mixtures are combinations of substances that can be easily separated by physical means. In the given options, both the chocolate bar with almonds and orange juice with pulp are mechanical mixtures. In the chocolate bar with almonds, the almonds can be easily separated from the chocolate. Similarly, in orange juice with pulp, the pulp can be separated from the juice. On the other hand, chocolate milk and flat pop are not mechanical mixtures as they are homogeneous mixtures where the components are evenly distributed and cannot be easily separated.Rate this question:
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- 10.
What happens when you try to make a solution of salt and oil?
- A.
It becomes a homogeneous solution, the salt dissolves into the oil
- B.
It becomes a heterogeneous mixture, the salt doesn't dissovle into the oil
- C.
The oil can only dissolve a little bit of salt
Correct Answer
B. It becomes a heterogeneous mixture, the salt doesn't dissovle into the oilExplanation
When you try to make a solution of salt and oil, it becomes a heterogeneous mixture because salt does not dissolve into oil. This is because salt is soluble in water but not in oil. Therefore, the salt particles remain separate from the oil particles, resulting in a mixture where the salt can be seen as separate particles floating in the oil.Rate this question:
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- 11.
To separate a solution of black pepper and salt...
- A.
Add water to collect the pepper
- B.
Pick out the pepper from salt by hand
- C.
Add water, filter out the pepper, boil off the water to get salt
- D.
Add water, filter out the salt, boil off the water to get the pepper
Correct Answer
C. Add water, filter out the pepper, boil off the water to get saltExplanation
the salt will dissolve in the water, pepper will not. It is too hard to separate the salt and pepper because they are both so small.Rate this question:
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