Homework WB 11th March

• Science
• Lower Secondary (Key Stage 3)

Year 9

What type of bond is formed between a metal and a nonmetal?

1. Hydrogen bond
2. Ionic bond
3. Metallic bond
4. Covalent bond

In an ionic bond, electrons are transferred from the ______ to the ______.

1. Orbital, suborbital
2. Metal, nonmetal
3. Valence, core
4. Nonmetal, metal

What is the charge of an ion formed by a metal in an ionic bond?

1. Positive
2. Negative
3. Variable
4. Neutral

What type of atoms tend to form ionic bonds?

1. Noble gases
2. Metal and nonmetal
3. Nonmetal and nonmetal
4. Metal and metal

What is the term for the electrostatic attraction between oppositely charged ions in an ionic compound?

1. Ionic bond
2. Covalent bond
3. Polar bond
4. Metallic bond

What type of bonding involves the sharing of electron pairs between atoms?

1. Metallic bonding
2. Hydrogen bonding
3. Covalent bonding
4. Ionic bonding

Which of the following is a characteristic of covalent bonds?

1. They are typically found in metals.
2. They are formed between nonmetal atoms.
3. They involve the transfer of electrons.
4. They are always polar.

What is the term for a covalent bond in which the shared electrons are not equally attracted by the bonded atoms?

1. Polar covalent bond
2. Metallic bond
3. Single covalent bond
4. Nonpolar covalent bond

Which molecule exhibits a nonpolar covalent bond?

1. Ammonia (NH3)
2. Water (H2O)
3. Oxygen (O2)
4. Hydrogen chloride (HCl)

In a double covalent bond, how many pairs of electrons are shared between the bonded atoms?

1. Three pairs
2. Two pairs
3. One pair
4. Four pairs

What is the primary type of bonding in metallic elements?

1. Ionic bonding
2. Covalent bonding
3. Electron sea model
4. Hydrogen bonding

What is the property of metallic bonds that allows them to conduct electricity?

1. Covalent bonding
2. Lattice structure
3. High melting point
4. Delocalized electrons

What is the term for the attraction between metal ions and delocalized electrons?

1. Van der Waals forces
2. Metallic bonding
3. Dipole-dipole interactions
4. Hydrogen bonding

What type of crystal structure do metals generally have due to metallic bonding?

1. Close-packed structure
2. Body-centered cubic structure
3. Hexagonal close-packed structure
4. Simple cubic structure

What is the smallest unit of an element?

1. Molecule
2. Cell
3. Proton
4. Atom

What is the central part of an atom?

1. Neutron
2. Nucleus
3. Electron
4. Proton

Which subatomic particle has a positive charge?

1. Neutron
2. Molecule
3. Electron
4. Proton

What is the total number of protons and neutrons in an atom?

1. Atomic number
2. Nucleus charge
3. Atomic mass
4. Electron cloud

Which scientist proposed the atomic theory?

1. Albert Einstein
2. Marie Curie
3. John Dalton
4. Isaac Newton

Who proposed the idea of the atom?

1. Aristotle
2. Democritus
3. Einstein
4. Newton

What subatomic particle has a negative charge?

1. Photon
2. Proton
3. Electron
4. Neutron

Where is the nucleus located in an atom?

1. Top
2. Center
3. Outside
4. Bottom

What is the atomic number of an element based on?

1. Number of Neutrons
2. Number of Protons
3. Atomic Mass
4. Number of Electrons