Homework WB 18th March

• Science
• Lower Secondary (Key Stage 3)

Homework WB 18th March

What is an ion?

1. An atom with a net electrical charge
2. A molecule with two atoms

Which type of ion has gained electrons?

1. An anion
2. A cation

What charge does a cation have?

1. Positive
2. Negative

What is the charge of a metal ion in a compound?

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

Which metal ion is commonly found in hemoglobin?

1. Lead
2. Zinc
3. Copper
4. Iron

What is the smallest unit of an element?

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

Who proposed the atomic theory?

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

What is the nucleus of an atom made of?

1. Neutrons and Photons
2. Electrons and Neutrons
3. Protons and Neutrons
4. Protons and Electrons

What type of bond is formed when one atom donates an electron to another atom?

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

Which of the following is a characteristic of an ionic bond?

1. Formation of ions
2. Sharing of electrons
3. High electrical conductivity
4. Malleability and ductility

What happens to the electrons in an ionic bond?

1. Formation of molecular orbitals
2. Transfer from one atom to another
3. Sharing between atoms
4. Absorption into the nucleus

Why do ionic compounds have high melting and boiling points?

1. Low density of ions
2. Strong electrostatic forces between ions
3. Presence of covalent bonds
4. Weak intermolecular forces

What is the nature of the bond in sodium chloride (NaCl)?

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

What is the charge of the chloride ion?

1. 0
2. -1
3. +2
4. +1

Which non-metal ion is commonly found in table salt?

1. Nitrate
2. Sulfate
3. Chloride
4. Phosphate

What is the symbol for the hydroxide ion?

1. CO₃²⁻
2. OH⁻
3. O²⁻
4. H⁺

What type of bond involves the sharing of electrons between atoms?

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

In a covalent bond, how are electrons shared between atoms?

1. Unequally
2. Transferred
3. Equally
4. Not shared

What is the term for a covalent bond formed by the sharing of two electrons?

1. Ionic bond
2. Triple bond
3. Double bond
4. Single bond

Which of the following is a property of covalent compounds?

1. Soluble in water
2. Conducts electricity
3. Low melting point
4. High melting point

Ionic bonding.

Ionic compounds have regular structures in which there are strong electrostatic forces of attraction in all directions between oppositely charged ions.

As a result of these forces ionic compounds have high melting and high boiling points. 

all

Ionic

electrostatic

high

boiling

regular

Which word was missing from the last slide

1. Same
2. Similar
3. Oppositely
4. Together

Ionic compounds

Which of the following are ionic compounds?

Sodium  chloride

Water

Steel

Calcium carbonate

Carbon dioxide

Iron fluoride

Magnesium Sulfate

Sulfur dioxide

Carbon

Nickel

Ionic compounds

Ionic compounds have regular structures, called giant ionic lattices. In a giant ionic lattice, there are strong electrostatic forces of attraction acting in all directions between the oppositely charged ions. The structure and bonding of ionic compounds explain their properties.

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