Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 160 views

    Worksheet Class - 7 SUBJECT-Science CHAPTER - 3, Chemical Substances and Processes A. Fill in The Blanks

    Uploaded by

    Renee Disa
    1. The document is a worksheet for a 7th grade science class covering chemical substances and processes. It includes questions about elements, compounds, mixtures, chemical and physical changes, and chemical reactions like combustion, decomposition, and displacement. 2. Students are asked to fill in blanks, identify statements as true or false, match terms to their definitions, answer questions briefly, and choose the correct answer to multiple choice questions. 3. The worksheet covers important concepts like the difference between elements and compounds, types of chemical reactions, and the use of chemical formulas and symbols to represent substances and ions.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Worksheet Class - 7 SUBJECT-Science CHAPTER - 3, Chemical Substances and Processes A. Fill in The Blanks

    Uploaded by

    Renee Disa
    160 views3 pages
    1. The document is a worksheet for a 7th grade science class covering chemical substances and processes. It includes questions about elements, compounds, mixtures, chemical and physical changes, and chemical reactions like combustion, decomposition, and displacement. 2. Students are asked to fill in blanks, identify statements as true or false, match terms to their definitions, answer questions briefly, and choose the correct answer to multiple choice questions. 3. The worksheet covers important concepts like the difference between elements and compounds, types of chemical reactions, and the use of chemical formulas and symbols to represent substances and ions.

    Original Description:

    Chemical

    Original Title

    Class 7, Chemical Substances and Processes

    Copyright

    © © All Rights Reserved

    Available Formats

    PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    1. The document is a worksheet for a 7th grade science class covering chemical substances and processes. It includes questions about elements, compounds, mixtures, chemical and physical changes, and chemical reactions like combustion, decomposition, and displacement. 2. Students are asked to fill in blanks, identify statements as true or false, match terms to their definitions, answer questions briefly, and choose the correct answer to multiple choice questions. 3. The worksheet covers important concepts like the difference between elements and compounds, types of chemical reactions, and the use of chemical formulas and symbols to represent substances and ions.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    160 views3 pages

    Worksheet Class - 7 SUBJECT-Science CHAPTER - 3, Chemical Substances and Processes A. Fill in The Blanks

    Uploaded by

    Renee Disa
    1. The document is a worksheet for a 7th grade science class covering chemical substances and processes. It includes questions about elements, compounds, mixtures, chemical and physical changes, and chemical reactions like combustion, decomposition, and displacement. 2. Students are asked to fill in blanks, identify statements as true or false, match terms to their definitions, answer questions briefly, and choose the correct answer to multiple choice questions. 3. The worksheet covers important concepts like the difference between elements and compounds, types of chemical reactions, and the use of chemical formulas and symbols to represent substances and ions.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    WORKSHEET

    CLASS - 7

    SUBJECT- Science

    CHAPTER- 3, Chemical substances and Processes

    A. Fill in the blanks.


    1. Iron is an ——— because it is made up of the ——- of the same kind. 2.
    Water is a ———-, each molecule of it contains —— ——of hydrogen and one atom of
    ————-.
    3. During a ———- change, the ——— state, shape, size or colour of the
    substance might change.
    4. Burning of candle is an example of a ———— change.
    5. Acid + ———— ————-> ————+ water.

    B. Write true or false.


    1. NaOH + H2O————-> NaCl + HCl. ————.
    2. Mixtures are not pure substances. ————.
    3. Fe +CuSO4—-> FeSO4+Cu is a displacement reaction——-.
    4. Products undergo a chemical change in a reaction. ————.
    5. Nitrogen + Hydrogen ————> ammonia ————.

    C. Match the following.


    1. Limestone Decomposition reaction
    2. Breaking up of water. Ions
    3. Curdling of milk. CaCO3
    4. Melting of candle Chemical change
    5. Charged particles. Physical change

    D. Answer the following briefly.


    1. Explain chemical change with an example.
    2. What is a chemical reaction? Give an example.
    3. Are lemonade and soil mixtures? Explain.
    4. Write the formula of Calcium carbonate with steps.
    5. Give a chemical reaction to represent a Displacement reaction.

    E. Answer the following.


    1. Differentiate between
    a. Combination and Decomposition reaction.
    b. Physical and chemical changes
    2. Explain neutralisation reaction with an example.
    3. Give two differences between an element and a compound, using suitable
    examples.
    4. Give chemical symbols of these elements
    Potassium ——, Iron——, Calcium———,
    Chlorine———,Silver——-. 5. Give the symbol of these ions and write
    their charges
    Name. Symbol with charge
    Sulphate
    Nitrate
    Oxide
    Chloride
    Magnesium
    Copper

    F. Pick the correct answer.


    1. Chemical substances are represented by
    a. Formula
    b. Symbols
    c. Reaction
    d. None
    2. New substances are formed when two or more substances combine
    a. Combination reaction
    b. Decomposition reaction
    c. Neutralisation reaction
    d. None
    3. Two or more substances mixed together in any ratio
    a. Element
    b. Compound
    c. Products
    d. Reactants
    4. New substances formed after a chemical reaction
    a. Products
    b. Reactants
    c. Mixture
    d. None
    5. Reaction in which more than one product is obtained
    a. Displacement
    b. Decomposition
    c. Combination
    d. None
    6. Substances undergoing change in a chemical reaction
    a. Products
    b. Reactants
    c. Mixtures
    d. None
    7. Charged particles making many substances are called
    a. Ions
    b. Atoms
    c. Molecules
    d. All of above
    8. Acid reacts with a base in a
    a. Combination reaction
    b. Neutralisation reaction
    c. Decomposition reaction
    d. None
    9. Chemical composition of the substance is given by
    a. Chemical formula
    b. Symbol
    c. Element
    d. All of these
    10. Pure substances are
    a. Elements
    b. Compounds
    c. a & b
    d. Mixtures

    G. Make a list of Physical changes and Chemical changes( 10 each


    ) happening around you in the household and immediate neighbourhood.

    You might also like