Chemistry MOCK ACP Sem 1

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or evaporating) and changes in shape (like cutting).

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves making or breaking of bonds between atoms. Examples include burning wood or rusting iron.

Front

What is the formula to calculate the energy of a wave?

Back

The energy (E) of a wave can be calculated using the formula E = h * f, where h is Planck's constant (6.626 x 10^-34 J·s) and f is the frequency of the wave.

Front

What is the empirical formula?

Back

The empirical formula is the simplest whole-number ratio of the elements in a compound. It does not necessarily represent the actual number of atoms in a molecule.

Front

How do you determine the empirical formula from mass percentages?

Back

To determine the empirical formula from mass percentages, convert the percentages to grams, then to moles, and finally find the simplest mole ratio of the elements.

Front

What is wavelength?

Back

Wavelength is the distance between successive crests of a wave, typically measured in meters. It is inversely related to frequency.

Front

What is the relationship between wavelength and frequency?

Back

The relationship between wavelength (λ) and frequency (f) is given by the equation c = λ * f, where c is the speed of light (approximately 3.00 x 10^8 m/s).

Front

What is the significance of the electromagnetic spectrum?

Back

The electromagnetic spectrum encompasses all types of electromagnetic radiation, arranged by wavelength or frequency. It includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

Front

What is the formula for aluminum sulfate?

Back

The correct formula for aluminum sulfate is Al₂(SO₄)₃.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds are formed when electrons are transferred from one atom to another, resulting in charged ions. Covalent bonds are formed when two atoms share electrons.