Algebra Class 10

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Questions and Answers

What determines the identity of an atom?

  • Number of protons (correct)
  • Number of electrons
  • Number of neutrons
  • Number of shells

An atom can have a variable number of protons.

False (B)

What is the nucleus of an atom composed of?

Protons and neutrons

An atom with a charge due to the loss or gain of electrons is called an ___________.

<p>ion</p> Signup and view all the answers

Match the following elements with their atomic numbers:

<p>Hydrogen = 1 Carbon = 6 Oxygen = 8 Neon = 10</p> Signup and view all the answers

What is the unique characteristic of an element that determines its identity?

<p>Number of protons (A)</p> Signup and view all the answers

Atoms of the same element can have different numbers of neutrons.

<p>True (A)</p> Signup and view all the answers

What is the Bohr Model of an atom?

<p>A model of an atom that includes a nucleus containing protons and neutrons with surrounding shells of electrons</p> Signup and view all the answers

An atom that has a charge due to the loss or gain of electrons is called a/an ______________.

<p>ion</p> Signup and view all the answers

Match the following elements with their number of protons:

<p>Hydrogen = 1 Carbon = 6 Oxygen = 8 Neon = 10</p> Signup and view all the answers

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Study Notes

Algebraic Expressions

  • Translate algebraic expressions to English expressions and vice versa.
  • Simplify algebraic expressions by: • Adding and subtracting algebraic terms. • Multiplying and dividing algebraic terms. • Simplifying terms that are algebraic fractions. • Collecting like terms.
  • Evaluate expressions by substituting given values of each pronumeral involved.
  • Expand brackets and simplify where necessary.

Algebraic Equations and Inequalities

  • Check whether a value is a solution of an equation by substitution.
  • Solve linear equations, including those involving: • Brackets. • Algebraic fractions. • Equations with pronumerals on both sides.
  • Solve linear inequalities.
  • Rearrange formulas to change the subject.
  • Solve simultaneous linear equations using: • Elimination method. • Substitution method.
  • Solve quadratic equations in the form ax^2 = c.
  • Solve problems by forming and solving algebraic equations.

Atoms, Elements, Compounds, and Mixtures

  • An atom is the smallest unit of a chemical element that retains the properties of that element.
  • An element is a substance that consists of only one type of atom, each with a unique number of protons.
  • A compound is a substance formed by the chemical combination of two or more different elements.
  • A mixture is a blend of two or more substances, where each substance maintains its chemical properties.

Atomic Structure

  • An atom consists of protons, neutrons, and electrons.
  • Protons are positively charged particles located in the nucleus (center) of the atom.
  • Neutrons are particles with no charge, located in the nucleus along with protons.
  • Electrons are negatively charged particles that orbit the nucleus in energy levels or shells.

Atom Identification

  • Each element has unique atoms identified by the number of protons in the atomic nucleus.
  • The number of protons determines the identity of an atom (i.e., the name of the element).
  • Given the number of protons or electrons, the element can be identified.

Bohr Model

  • The Bohr Model is a model of the atom that consists of a nucleus (protons and neutrons) surrounded by energy levels or shells of electrons.
  • The nucleus is positively charged, while the electrons are negatively charged.

Ions and Ionic Compounds

  • An ion is an atom or molecule with a charge due to the loss or gain of electrons.
  • The periodic table can be used to calculate the charge on ions.
  • Ionic compounds are formed when ions with opposite charges combine.
  • Examples of common ionic compounds include:
    • Sodium chloride (NaCl)
    • Calcium carbonate (CaCO3)
    • Aluminum oxide (Al2O3)

Atoms, Elements, Compounds, and Mixtures

  • An atom is the smallest unit of a chemical element that retains the properties of that element.
  • An element is a substance that consists of only one type of atom, each with a unique number of protons.
  • A compound is a substance formed by the chemical combination of two or more different elements.
  • A mixture is a blend of two or more substances, where each substance maintains its chemical properties.

Atomic Structure

  • An atom consists of protons, neutrons, and electrons.
  • Protons are positively charged particles located in the nucleus (center) of the atom.
  • Neutrons are particles with no charge, located in the nucleus along with protons.
  • Electrons are negatively charged particles that orbit the nucleus in energy levels or shells.

Atom Identification

  • Each element has unique atoms identified by the number of protons in the atomic nucleus.
  • The number of protons determines the identity of an atom (i.e., the name of the element).
  • Given the number of protons or electrons, the element can be identified.

Bohr Model

  • The Bohr Model is a model of the atom that consists of a nucleus (protons and neutrons) surrounded by energy levels or shells of electrons.
  • The nucleus is positively charged, while the electrons are negatively charged.

Ions and Ionic Compounds

  • An ion is an atom or molecule with a charge due to the loss or gain of electrons.
  • The periodic table can be used to calculate the charge on ions.
  • Ionic compounds are formed when ions with opposite charges combine.
  • Examples of common ionic compounds include:
    • Sodium chloride (NaCl)
    • Calcium carbonate (CaCO3)
    • Aluminum oxide (Al2O3)

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