Chemistry Questions and Answers

The periodic property that is used to determine whether a covalent molecule is polar or not is electronegativity.

Electronegativity is a measure of the ability of an atom to attract electrons in a chemical bond. The greater the electronegativity of an atom, the more strongly it will attract electrons.

The density of a gas is directly proportional to its molar mass. This means that gases with a lower molar mass will be less dense than gases with a higher molar mass. Nitrogen (N2) has a molar mass of 28 g/mol, which is less than that of air (approximately 29 g/mol), making it less dense than air.

Natural gas is a fossil fuel primarily composed of hydrocarbon gases. The primary component of natural gas is methane, which typically makes up a significant portion of the gas mixture. Methane is a simple hydrocarbon with one carbon atom and four hydrogen atoms (CH4). It is the main component of natural gas, often accounting for over 90% of its composition.

Melting point increases. This is because the atoms become larger as you go down the group, which means that the metallic bonds between them become stronger.

Flooding is a major consequence of global warming because as the Earth's ice caps and glaciers melt, sea levels rise. This can cause flooding in coastal areas and low-lying islands. For example, in 2019, the Netherlands experienced its worst flooding in decades, with over 10,000 homes damaged and thousands of people evacuated.