Let's solve the worksheet step by step and provide explanations for each answer. This is a science activity for Grade 6, focusing on
elements and basic chemistry concepts.
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I. What is an Element?
Clue: Textbook page no: 107 key points
Answer:
An element is the
simplest kind of
matter which cannot be
broken into
two or more substances by
chemical means.
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✔ Explanation:
An element is a pure substance made of only one type of atom. It cannot be broken down into simpler substances through chemical reactions. For example, oxygen (O₂) is an element that can't be split into simpler substances using chemistry.
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II. Select the suitable answer from the following from the drop-down box.
*(Note: Since the "drop-down box" isn't visible in the image, we'll use standard scientific knowledge to fill in the blanks logically.)*
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1.
Elements are made up of
atoms.
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✔ Explanation: All elements are composed of tiny particles called atoms. Each element has its own unique type of atom.
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2.
Oxygen is the most abundant
element in Earth’s crust.
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✔ Explanation: Oxygen makes up about 46% of the Earth’s crust by weight, making it the most abundant element.
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3. Air consists of some
gases like
oxygen that every living thing uses for breathing.
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✔ Explanation: Air is a mixture of gases, mainly nitrogen and oxygen. Oxygen is essential for respiration in most living organisms.
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4. We can split an element into many simpler substances.
False.
>
✔ Explanation: Elements
cannot be split into simpler substances by chemical means. That’s the definition of an element. If you could split it, it wouldn’t be an element.
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5.
Curium is an element that is named after a scientist.
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✔ Explanation: Curium (Cm) is named after Marie and Pierre Curie, famous scientists who worked on radioactivity.
> *Other examples:* Einsteinium (Einstein), Fermium (Fermi), etc.
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6. The classified chart of elements is called as
periodic table.
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✔ Explanation: The periodic table organizes all known elements based on their atomic number and properties.
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7. Elements are arranged in the periodic table according to their
atomic number.
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✔ Explanation: The atomic number is the number of protons in the nucleus of an atom. Elements are ordered by increasing atomic number.
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8. The elements in the periodic table are represented by a
symbol.
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✔ Explanation: Each element has a unique chemical symbol (e.g., H for hydrogen, O for oxygen).
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9. The symbol for hydrogen is
H and sodium is
Na.
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✔ Explanation:
- Hydrogen = H (from Latin *Hydrogenium*)
- Sodium = Na (from Latin *Natrium*)
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10. Every element has a different
atomic number and
chemical symbol.
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✔ Explanation:
- Atomic number defines the element (number of protons).
- Chemical symbol is the shorthand representation (like H, O, Fe).
No two elements share the same atomic number or symbol.
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✔ Final Completed Answers:
####
I.
An element is the
simplest kind of
matter which cannot be
broken into
two or more substances by
chemical means.
####
II.
1.
Elements are made up of
atoms.
2.
Oxygen is the most abundant
element in Earth’s crust.
3. Air consists of some
gases like
oxygen that every living thing uses for breathing.
4. We can split an element into many simpler substances.
False.
5.
Curium is an element that is named after a scientist.
6. The classified chart of elements is called as
periodic table.
7. Elements are arranged in the periodic table according to their
atomic number.
8. The elements in the periodic table are represented by a
symbol.
9. The symbol for hydrogen is
H and sodium is
Na.
10. Every element has a different
atomic number and
chemical symbol.
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✔ These answers align with standard Grade 6 science curriculum topics on matter and elements. Let me know if you'd like this formatted for printing or need a version with boxes filled in!
Parent Tip: Review the logic above to help your child master the concept of 6th grade science worksheet with answers.
