TRUE / FALSE
1.Water is homogenous substance.
2.Element is always metal.
3.Substance is always homogeneous
4.In compound elements combine in definite proportion.
5.Iodine can be purified by sublimation.
6.Mixtures are always combinations of the same compounds that are at different states.
7.We can separate all mixtures by filtration.
8.All mixtures are defined as “ heterogeneous”
9.Only specific compounds can be combined to form mixtures.
10.No pure elements are liquids at room temperature.
11.Mixtures are combinations of one or more compounds that can be separated with chemical processes.
12.Crystals can be made of mixtures.
Answers
Answer:
1. Water is homogenous substance.
A. True
2. Element is always metal.
A. False
3. Substance is always homogeneous
A. False
4. in compound elements combine in definite proportion.
A. True
5. Iodine can be purified by sublimation.
A. True
6. Mixtures are always combinations of the same compounds that are at different states.
A. False
7. We can separate all mixtures by filtration.
A. False
8. All mixtures are defined as “heterogeneous”
A. False
9. Only specific compounds can be combined to form mixtures.
A. False
10. No pure elements are liquids at room temperature.
A. False
11. Mixtures are combinations of one or more compounds that can be separated with chemical processes.
A. True
12. Crystals can be made of mixtures.
A. True
We have to identify the statements as True/False.
1. Water is homogeneous substance. ⇒ True.
explanation : We know, water is a compound and chemical formula of it is H₂O. we also know, a compound is homogeneous substance. hence, water is homogeneous substance.
Hence, above statement is True.
2. Element is always metal. ⇒ False
Explanation : Element is a substance which cannot be broken down into simpler constituents by any non-nuclear reaction. It is metal, non - metal or metalloid.
Hence, above statement is False.
3. substance is always homogeneous. ⇒ True
Explanation : yes, substance is always homogeneous because, substance is a particular kind of matter with uniform properties.
Hence, above statement is True.
4. In compound, elements combine in definite proportion. ⇒ True.
Explanation : Yes , It is true statement. a compound is the combination of elements in definite proportion.
Hence, above statement is True.
5. Iodine can be purified by sublimation. ⇒ True.
explanation : Iodine shows sublimation property. so it can be purified by sublimation method.
Hence, above statement is True.
6. Mixtures are always combinations of the same compounds that are at different states. ⇒ False.
Explanation : Any two or more substances are mixed together in any state forms a mixture.
Hence, above statement is False.
7. We can separate all mixtures by filtration. ⇒ False.
Explanation : No, there are a lot of methods to separate mixtures. some methods are ; handpicking , winnowing, Threshing , sieving , evaporation etc. filtration method is used for the mixture of solid - liquid. It can't be used for liquid - liquid or other mixtures.
Hence, above statement is False.
8. All mixtures are defined as “ heterogeneous” ⇒ False.
Explanation : No, mixtures are either homogeneous or heterogeneous.
Hence, above statement is False.
9. Only specific compounds can be combined to form mixtures. ⇒ False.
Explanation : Any two or more substance are mixed together in any state can form a mixture.
Hence, above statement is False.
10. No pure elements are liquids at room temperature. ⇒ False.
Explanation : Bromine and mercury are two pure elements which are found in liquid at room temperature.
Hence, above statement is False.
11. Mixtures are combinations of one or more compounds that can be separated with chemical processes.⇒ False.
Explanation : Any two or more substance are mixed together in any state can form a mixture.
Hence, above statement is False.
12. Crystals can be made of mixtures ⇒ True.
Explanation : Crystallisation is the process by which a solid forms, where the atoms or molecules are highly organized into a structure.
Hence, above statement is True.
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