S1 H-Final 2024

Front

What is density?

Back

Density is the mass of an object divided by its volume, typically expressed in grams per milliliter (g/ml) or kilograms per cubic meter (kg/m³).

Front

How do you calculate mass using density and volume?

Back

Mass can be calculated using the formula: Mass = Density × Volume.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds with other atoms.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the significance of protons in an atom?

Back

Protons determine the atomic number and identity of an element; they also contribute to the positive charge of the nucleus.

Front

What is the difference between protons, neutrons, and electrons?

Back

Protons are positively charged particles in the nucleus, neutrons are neutral particles also in the nucleus, and electrons are negatively charged particles that orbit the nucleus.

Front

What is a Bohr model?

Back

The Bohr model is a representation of an atom that depicts electrons in fixed orbits around the nucleus, with energy levels corresponding to their distance from the nucleus.

Front

What are the characteristics of metals?

Back

Metals are typically shiny, ductile, malleable, and good conductors of heat and electricity.

Front

What does ductile mean?

Back

Ductile refers to a material's ability to be stretched into a wire without breaking.

Front

What is brittleness in materials?

Back

Brittleness is a property of materials that causes them to break or shatter easily under stress, rather than deforming.