KSEEB Solutions for Class 5 EVS Chapter 12 Elements, Compounds and Mixtures in English Medium (2023).
In our daily life, we make use of different kinds of matter. The matters available in nature consist of molecules or compound molecules. When these compound molecules are subdivided, elements are obtained. The smallest unit of the element is called an atom. An atom is the smallest unit of an element having the same properties. Some atoms easily combine with others and form different substances. Depending on the atoms present in the substances, they are classified as elements, compounds, and mixtures. Here we provide KSEEB Solutions for Class 5 EVS Chapter 12 Elements, Compounds and Mixtures in English Medium (2023) with sample answers to important questions of this chapter. We feel it can be helpful in your exam preparation.👇👇👇
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Fill in the blanks with suitable words.
1. Element consists of a group of the same type of _____________
Answer- Atom
2. Compound consists of a group of atoms of different ______________
Answer-Elements
3. A compound is _______________________________________ ______________________________________________________ ______________________________________________________
Answer-When two are more elements combine chemically in a specific ratio and form a substance of new property it is called a compound. Example: Water - H2O Water is a compound formed by the chemical combination of Hydrogen and Oxygen in the ratio 2 :1
4. A mixture is _________________________________________ ______________________________________________________ ______________________________________________________
Answer: If two or more substances (elements or compounds) are mixed together in any ratio, such that they do not undergo any chemical change but retain their individual properties, then the resulting substance is called a mixture. Example: Soil is a mixture of sand, clay, many types of salts and residues of plants and animals.
5. Give five examples of each of these.
(Take the help of your teacher)
Element ____________________________________________
Answer: Oxygen - O, Hydrogen - H, Carbon - C , Natural element - Gold, Artificial element - Plutonium.
Compound _________________________________________
Answer: Water - H2O, Carbon-di-Oxide - CO2, Sodium chloride (salt) NaCl, sugar, baking soda.
Mixture ____________________________________________
Answer: Air, soil, seawater, sand.
Elements, Compounds, and Mixtures Extra Questions For Practice-
1. What is an element?
a) A substance with two or more types of atoms
b) A substance that cannot be broken down into simpler substances by chemical means
c) A mixture of two or more elements
d) A substance with a fixed composition of atoms
Answer: b) A substance that cannot be broken down into simpler substances by chemical means.
Explanation: An element consists of only one type of atom and cannot be further divided into simpler substances by chemical processes.
2. Which of the following is a compound?
a) Hydrogen (H)
b) Oxygen (O)
c) Water (H2O)
d) Neon (Ne)
Answer: c) Water (H2O)
Explanation: A compound is a substance composed of two or more elements in a fixed ratio. Water is a compound made up of hydrogen and oxygen in the ratio 2:1.
3. What is a mixture?
a) A substance with a fixed composition of atoms
b) A combination of two or more substances in which each substance retains its own chemical properties
c) A pure substance that cannot be separated by physical means
d) A compound that can be broken down into simpler substances
Answer: b) A combination of two or more substances in which each substance retains its own chemical properties.
Explanation: In a mixture, the substances are physically combined but not chemically bonded, allowing each component to retain its original properties.
4. Which of the following is a homogeneous mixture?
a) Sand and water
b) Oil and vinegar
c) Saltwater
d) Iron filings and sulfur powder
Answer: c) Saltwater
Explanation: A homogeneous mixture has a uniform composition throughout. Saltwater is an example where salt is evenly distributed in water.
5. What is the smallest unit of an element that retains its chemical properties?
a) Molecule
b) Atom
c) Ion
d) Compound
Answer: b) Atom
Explanation: Atoms are the basic building blocks of elements and are the smallest unit that retains the chemical properties of the element.
6. Which of the following is a characteristic of a compound?
a) Can be separated by physical means
b) Variable composition
c) Always contains two elements
d) Fixed composition
Answer: d) Fixed composition
Explanation: Compounds have a fixed ratio of elements, meaning they always have the same composition.
7. What happens to the properties of substances when they form a mixture?
a) They lose their original properties
b) They retain their original properties
c) They become compounds
d) They undergo a chemical change
Answer: b) They retain their original properties
Explanation: In a mixture, substances retain their original properties because there is no chemical bonding between them.
8. What is the chemical symbol for gold?
a) Au
b) Ag
c) Fe
d) Cu
Answer: a) Au
Explanation: The chemical symbol for gold is Au.
9. Which of the following is a heterogeneous mixture?
a) Lemonade
b) Air
c) Granite
d) Vinegar
Answer: c) Granite
Explanation: Granite is a heterogeneous mixture because its components (various minerals) are not uniformly distributed.
10. What is a molecule?
a) The smallest unit of an element
b) A combination of two or more atoms bonded together
c) A pure substance with a fixed composition
d) A substance that cannot be broken down by chemical means
Answer: b) A combination of two or more atoms bonded together
Explanation: A molecule is formed when two or more atoms are chemically bonded together.
11. Which of the following is an example of a pure element?
a) Table salt (NaCl)
b) Water (H2O)
c) Oxygen (O2)
d) Sugar (C6H12O6)
Answer: c) Oxygen (O2)
Explanation: Oxygen in its diatomic form (O2) is a pure element.
12. What is a physical change?
a) A change that alters the chemical composition of a substance
b) A change in state or appearance that does not create a new substance
c) A change that releases energy
d) A change that involves the formation of a compound
Answer: b) A change in state or appearance that does not create a new substance
Explanation: Physical changes do not alter the chemical composition of a substance.
13. Which of the following is a property of a mixture?
a) Fixed composition
b) Variable composition
c) Can be broken down into simpler substances by chemical means
d) Always contains two elements
Answer: b) Variable composition
Explanation: Mixtures can have varying proportions of their components.
14. What is the chemical formula for carbon dioxide?
a) CO
b) CO2
c) C2O
d) C3O
Answer: b) CO2
Explanation: The chemical formula for carbon dioxide is CO2.
15. Which of the following is a characteristic of a compound?
a) Can be separated by physical means
b) Variable composition
c) Always contains two elements
d) Fixed composition
Answer: d) Fixed composition
Explanation: Compounds have a fixed ratio of elements.
16. What is the process of separating a mixture based on the differences in boiling points of its components?
a) Filtration
b) Distillation
c) Evaporation
d) Chromatography
Answer: b) Distillation
Explanation: Distillation is a process that separates components based on differences in boiling points.
17. Which of the following is a heterogeneous mixture?
a) Air
b) Milk
c) Saltwater
d) Brass
Answer: d) Brass
Explanation: Brass is a mixture of copper and zinc and is not uniformly distributed.
18. What is the chemical symbol for sodium?
a) Na
b) Ne
c) Ni
d) Nb
Answer: a) Na
Explanation: The chemical symbol for sodium is Na.
19. What is the chemical formula for table salt?
a) NaCl
b) H2O
c) CO2
d) O2
Answer: a) NaCl
Explanation: The chemical formula for table salt is NaCl.
20. Which of the following is an example of a physical change?
a) Burning wood
b) Dissolving sugar in water
c) Rusting of iron
d) Melting ice
Answer: d) Melting ice
Explanation: Melting ice is a physical change as it involves a change in state without altering the chemical composition.
21. What is the chemical formula for methane?
a) CH4
b) CO2
c) H2O
d) NH3
Answer: a) CH4
Explanation: The chemical formula for methane is CH4.
22. What type of mixture is formed when two or more substances are evenly distributed and do not settle over time?
a) Heterogeneous mixture
b) Suspension
c) Colloid
d) Homogeneous mixture
Answer: d) Homogeneous mixture
Explanation: A homogeneous mixture has a uniform composition throughout.
23. Which of the following is an example of a colloid?
a) Saltwater
b) Milk
c) Sand and water
d) Lemonade
Answer: b) Milk
Explanation: A colloid is a mixture in which one substance is dispersed evenly throughout another, such as milk.
24. What is the chemical symbol for silver?
a) Ag
b) Au
c) Al
d) Si
Answer: a) Ag
Explanation: The chemical symbol for silver is Ag.
25. What is the process of separating a solid from a liquid using a barrier with small holes that allow the liquid to pass through but retain the solid?
a) Filtration
b) Distillation
c) Evaporation
d) Chromatography
Answer: a) Filtration
Explanation: Filtration is a method used to separate solids from liquids using a filter.
Class 5 EVS Chapter 12 Elements, Compounds and Mixtures FAQS.
Elements:
Q: What is an element?
A: An element is a substance that consists of only one type of atom.
Q: How many elements are currently known?
A: As of my last knowledge update in 2022, there are 118 known elements.
Q: Give an example of an element.
A: Oxygen is an example of an element. Its symbol is O.
Q: Can elements be broken down into simpler substances?
A: No, elements cannot be broken down into simpler substances by chemical means.
Q: What is the smallest unit of an element?
A: The smallest unit of an element is an atom.
Compounds:
Q: What is a compound?
A: A compound is a substance formed by the chemical combination of two or more different elements in fixed proportions.
Q: Provide an example of a compound.
A: Water (H2O) is a compound composed of hydrogen and oxygen.
Q: Can compounds be separated by physical means?
A: No, compounds require chemical processes to be separated into their constituent elements.
Q: What is the difference between a compound and a mixture?
A: A compound is a pure substance with a fixed composition, while a mixture is a combination of two or more substances in which each substance retains its own properties.
Q: How are chemical formulas used to represent compounds?
A: Chemical formulas use symbols to represent the types and numbers of atoms in a compound.
Mixtures:
Q: What is a mixture?
A: A mixture is a combination of two or more substances in which each substance retains its own chemical properties.
Q: Provide an example of a mixture.
A: Trail mix, consisting of nuts, dried fruits, and chocolate, is an example of a mixture.
Q: Can mixtures be separated by physical means?
A: Yes, mixtures can be separated by physical means such as filtration, distillation, or chromatography.
Q: What is the difference between a homogeneous and a heterogeneous mixture?
A: A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has an uneven composition.
Q: Is air a mixture or a compound?
A: Air is a mixture, primarily composed of nitrogen, oxygen, carbon dioxide, and other gases.
General Concepts:
Q: What is the law of conservation of mass?
A: The law of conservation of mass states that in a chemical reaction, the total mass of the reactants is equal to the total mass of the products.
Q: How are elements arranged on the periodic table?
A: Elements are arranged on the periodic table based on their atomic number, which is the number of protons in an atom.
Q: Define a molecule.
A: A molecule is a group of atoms bonded together. It can be composed of atoms of the same or different elements.
Q: What is a chemical reaction?
A: A chemical reaction is a process in which one or more substances are transformed into new substances with different properties.
Q: Explain the difference between a physical change and a chemical change.
A: A physical change involves a change in the form or state of a substance without a change in its chemical composition, while a chemical change results in the formation of new substances.
Write Differences between compounds and mixtures.
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Karnataka State Textbook 5th Class. There are a total of sixteen chapters in Environmental Studies, sample answers to practice questions of all sixteen chapters are given to you in this blog KSEEB Solutions For Class 5th EVS In English which we feel can be helpful in your exam preparation.
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