Class 7 Exam > Class 7 Notes > Chemistry Class 7 ICSE > Worksheet: Elements, Compounds and Mixtures
Worksheet: Elements, Compounds and Mixtures | Chemistry Class 7 ICSE PDF Download
Part A: Multiple Choice Questions
Q1. Which of the following is a compound?
a) Oxygen
b) Salt (NaCl)
c) Aluminium
d) Gold
Q2. Which of these metals is liquid at room temperature?
a) Aluminium
b) Mercury
c) Iron
d) Copper
Q3. Which of the following is a homogeneous mixture?
a) Oil and water
b) Sand and salt
c) Sugar dissolved in water
d) Soil
Q4. Which of the following is a noble gas?
a) Chlorine
b) Neon
c) Nitrogen
d) Bromine
Q5. Which separation method is best for separating salt from seawater?
a) Filtration
b) Evaporation
c) Sublimation
d) Chromatography
Part B: Short Answer Questions
Q6. Define an element and give two examples each of metals and non-metals.
Q7. Why is water (H₂O) called a compound and not a mixture?
Q8. What is atomicity? Classify the following: He, O₂, O₃, P₄.
Q9. State two differences between a compound and a mixture.
Q10. Why is paper chromatography useful in separating inks?
Part C: Long Answer Questions
Q11. Explain with steps how you would separate a mixture of salt, sand, and iron filings.
Q12. Why is distillation better than evaporation for obtaining pure water from salt water?
Q13. Compare metals and non-metals under five properties with examples.
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FAQs on Worksheet: Elements, Compounds and Mixtures - Chemistry Class 7 ICSE
| 1. What are the main differences between elements, compounds, and mixtures? |  |
Ans.Elements are pure substances that consist of only one type of atom, such as oxygen (O) or gold (Au). Compounds are substances formed when two or more elements chemically combine in fixed proportions, like water (H₂O) or carbon dioxide (CO₂). Mixtures, on the other hand, are combinations of two or more substances that retain their individual properties and can be separated physically, like a salad or air.
| 2. How can we separate the components of a mixture? | |
Ans.Components of a mixture can be separated using various physical methods, depending on the nature of the mixture. Common methods include filtration, where solids are separated from liquids; evaporation, which can remove a liquid from a solution; and distillation, which separates liquids based on boiling points. For example, sand can be filtered out of saltwater, and the salt can be recovered by evaporation.
| 3. What is an example of a compound and how is it different from a mixture? | |
Ans.An example of a compound is sodium chloride (NaCl), commonly known as table salt. It is a compound because it is formed by the chemical combination of sodium (Na) and chlorine (Cl) in a 1:1 ratio. Unlike a mixture, where the individual components retain their properties, in compounds, the elements lose their individual characteristics and exhibit new properties.
| 4. Can mixtures have variable compositions? | |
Ans.Yes, mixtures can have variable compositions. This means that the proportions of the components in a mixture can vary, unlike compounds, which have a fixed ratio of elements. For instance, air is a mixture of gases including nitrogen, oxygen, and carbon dioxide, and the ratio of these gases can change depending on the location and conditions.
| 5. What is the significance of understanding elements, compounds, and mixtures in everyday life? | |
Ans.Understanding elements, compounds, and mixtures is essential in everyday life as it helps us comprehend the materials we use and encounter. For instance, knowledge about mixtures aids in cooking and food preparation, while understanding compounds is crucial in chemistry and medicine for developing new drugs and materials. This foundational knowledge supports informed decision-making in various fields, including environmental science, engineering, and health.
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Sep 04, 2025
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