0.045 has only 2 significant figures.

CH4 (methane) has the lowest boiling point due to weak London dispersion forces compared to the other molecules.

F2 has the lowest bond energy due to the repulsion between the lone pairs on the fluorine atoms.

He2 has a bond order of 0, calculated as (2 bonding electrons - 2 antibonding electrons)/2 = 0.

Potassium (K) has the lowest melting point among the alkali metals.

The 0.1 M NaCl and KCl solutions will have lower vapor pressures than pure water due to the presence of solute particles.

The solid sphere has the smallest moment of inertia compared to the other shapes for the same mass and radius.

World War II caused significant population displacement due to the war, genocide, and the subsequent redrawing of national borders.

Yellowstone National Park, established in 1872, is recognized as the first national park in the world, marking a significant step in environmental conservation.

The United Nations was established in 1945, following the end of World War II, with the aim of promoting international cooperation and preventing future conflicts.

The Bantu Migration is often linked to climate change, as shifts in climate conditions prompted the movement of Bantu-speaking peoples across Africa in search of arable land.

Thyroxine, insulin, and glucagon all play significant roles in the regulation of metabolism.

Cyclobutane is a cyclic compound, while the others are linear alkenes or alkanes.

Methane (CH4) is a gas at room temperature, while the others are liquids.

C4H10 (butane) is a saturated hydrocarbon, containing only single bonds.

Hydrogen gas (H2) is commonly used as a reducing agent in various chemical reactions.

The idiom 'bite the bullet' means to face a difficult situation with courage.

Bite the bullet means to face a difficult situation or take a risk.

Stable GDP growth is an indicator of a healthy economy, reflecting consistent economic activity.

Bromothymol blue changes color at a neutral pH, making it suitable for strong acid-strong base titrations.

Phenolphthalein is commonly used for strong acid-strong base titrations as it changes color at pH 8.2-10.

Bromothymol blue is suitable for strong acid-strong base titrations as it changes color around pH 7.

Phenolphthalein is suitable as it changes color around pH 7-10, which is ideal for strong acid-strong base titrations.

The Millennium Development Goals aimed to address global inequalities and promote inclusive growth by focusing on poverty reduction and sustainable development.

Aryabhata is credited with the introduction of the concept of zero in mathematics, which was a significant advancement in the field.

The spinning jenny, invented by James Hargreaves in 1764, significantly improved textile production by allowing one worker to spin multiple spools of thread simultaneously.

Mn2+ has a d5 configuration as it loses two electrons from its 4s and 3d orbitals.

All of the ions Na+, Cl-, and Mg2+ have achieved a stable octet configuration.

Fe²⁺ has the highest magnetic moment due to its higher number of unpaired electrons compared to Co²⁺, Ni²⁺, and Cu²⁺.

Si4+ has the smallest ionic radius due to its high positive charge, which pulls the electrons closer.