14 Questions
What is the primary reason why noble gases do not form bonds with other elements?
They have a full outer energy level
What is the charge of the ion formed by the element magnesium?
+2
What is the term for the process of rewriting a chemical equation to have the same number of atoms of each element on both the reactant and product sides?
Balancing the equation
What type of bond is formed between two atoms that share one or more pairs of electrons?
Covalent bond
What is the term for a change in which the substance's chemical composition remains the same?
Physical change
What is the purpose of using valence shell electron configuration diagrams in the formation of ionic bonds?
To predict the type of bond formed
What is the main difference between elements and compounds?
Elements are substances that cannot be broken down into simpler substances, while compounds are substances that can be broken down into simpler substances.
Which of the following is NOT a characteristic of metals?
Brittle and breaks easily
What is the term for the number of electrons an atom can gain or lose to form a bond with another atom?
Valency
What do elements in each column of the periodic table have in common?
Same chemical properties
What type of bond is formed when two atoms share electrons?
Covalent bond
What is the difference between an atom and a molecule?
An atom is a single element, while a molecule is a group of atoms.
What is the term for a mixture of two or more substances that are not chemically combined?
Mixture
What is the location of the metals in the periodic table?
Left side and center of the periodic table
Study Notes
Matter and Elements
- Matter is anything that has mass and occupies space
- Elements are substances that consist of only one type of atom
- The first 20 elements on the periodic table, along with their symbols, are:
- Hydrogen (H), Helium (He), Lithium (Li), Beryllium (Be), Boron (B), Carbon (C), Nitrogen (N), Oxygen (O), Fluorine (F), Neon (Ne), Sodium (Na), Magnesium (Mg), Aluminium (Al), Silicon (Si), Phosphorus (P), Sulfur (S), Chlorine (Cl), Argon (Ar), Potassium (K), Calcium (Ca)
- Transitional metals, along with their atomic numbers and symbols, include:
- Iron (Fe, 26), Copper (Cu, 29), Zinc (Zn, 30), Silver (Ag, 47), Gold (Au, 79), Mercury (Hg, 80)
Atoms
- Atoms are the building blocks of matter, consisting of protons, neutrons, and electrons
- Subatomic particles and their characteristics:
- Electrons: located outside the nucleus, negative charge, almost no mass
- Protons: located in the nucleus, positive charge, relative mass of 1
- Neutrons: located in the nucleus, no charge, relative mass of 1
Compounds and Mixtures
- Compounds are substances formed by the chemical combination of two or more elements
- Examples of compounds: water (H2O), carbon dioxide (CO2), hydrogen gas (H2)
- Mixtures are physical combinations of two or more substances
- Examples of mixtures: air, soil, blood
- Pure substances are either elements or compounds
Periodic Table
- Metals are found on the left side and center of the periodic table
- Non-metals are found on the right side of the periodic table
- Metalloids are found on the border between metals and non-metals
- Elements in each row of the periodic table have the same period number, which increases from top to bottom
- Elements in each column of the periodic table have the same group number, which increases from left to right
Properties of Metals and Non-metals
- Common properties of metals:
- Good conductors of electricity
- Good conductors of heat
- Malleable and ductile
- High density
- Typically solid at room temperature
- Common properties of non-metals:
- Poor conductors of electricity
- Poor conductors of heat
- Brittle and non-ductile
- Low density
- Can be solid, liquid, or gas at room temperature
Molecules and Bonds
- Molecules are groups of atoms chemically bonded together
- Examples of molecules: water (H2O), carbon dioxide (CO2), hydrogen gas (H2)
- Valency refers to the number of electrons an atom gains, loses, or shares to form bonds
- Covalent bonds are formed when atoms share electrons
- Ionic bonds are formed when atoms transfer electrons
- Ions are formed when atoms gain or lose electrons, resulting in a charge
Chemical Reactions
- Physical change: a change in state or phase of a substance, without a change in composition
- Chemical change: a change in the composition of a substance, resulting in a new substance
- Signs of chemical change: color change, temperature change, gas production, precipitate formation
- Chemical equation: a representation of a chemical reaction, using formulas of reactants and products
- Balanced chemical equation: a chemical equation where the number of atoms of each element is the same on both the reactant and product sides
A revision quiz for year 8.1 chemistry students, covering basic concepts, element names, and the periodic table. Test your knowledge of matter, atoms, and subatomic particles.
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