Science Test 2 Revision

What are the main groups of the periodic table?

• Alkali metals, Alkaline earth metals, Transition metals, Lanthanides, Actinides, Halogens, Noble gases

• Metalloids

• Noble metals

• Rare earth elements

How do you determine the electron configuration of an element?

• The electron configuration is determined solely by the element's mass number.

• The electron configuration of an element is determined by its atomic number and follows the order of filling orbitals according to the Aufbau principle, Pauli exclusion principle, and Hund's rule.

• The electron configuration can be found by looking at the periodic table without any calculations.

• Electron configurations are random and do not follow any specific rules.

What is the difference between ionic and covalent bonds?

• Ionic bonds involve electron transfer and attraction between ions, while covalent bonds involve electron sharing between atoms.

• Ionic bonds occur only in metals, while covalent bonds occur only in non-metals.

• Ionic bonds are formed by sharing electrons, while covalent bonds involve electron transfer.

• Covalent bonds are stronger than ionic bonds due to their nature of attraction between ions.

Can you name the types of chemical reactions?

• sublimation, evaporation, condensation

• neutralization, ionization, crystallization

• synthesis, decomposition, single replacement, double replacement, combustion, redox

• oxidation, hydrolysis, polymerization

What are some common properties of metals?

• Transparency

• Brittleness

• Low melting point

• Common properties of metals include conductivity, malleability, ductility, luster, and high density.

How do acids differ from bases in terms of pH?

• Acids have a pH less than 7, and bases have a pH greater than 7.

• Both acids and bases have a pH of 7.

• Acids and bases have the same pH level.

• Acids have a pH greater than 7, and bases have a pH less than 7.

What group in the periodic table contains noble gases?

• Group 3

• Group 18

• Group 14

• Group 1

What is the significance of valence electrons in bonding?

• Valence electrons are irrelevant in chemical reactions.

• Valence electrons are significant in bonding because they determine how atoms interact and bond with each other.

• Valence electrons only affect the mass of an atom.

• Valence electrons are only important in ionic compounds.

How do you identify a chemical change?

• Changes in mass or volume only

• Presence of a solid in a liquid

• No observable changes in the substance

• Look for changes in color, temperature, gas production, precipitate formation, or odor change.

What is a characteristic property of alkali metals?

• High reactivity with water

• High density compared to transition metals

• Non-reactive with air

• Low melting point