Chemistry NCFE 2018-19 #1-15

Front

What color of light does a hydrogen atom emit when an electron transitions from the n=6 energy level to the n=2 energy level?

Back

Violet light is emitted during this transition.

Front

What is the equation for the radioactive decay of a gold isotope: 174Au → 170Ir + ?

Back

The missing particle is an alpha particle.

Front

What is the chemical formula for chromium(III) oxide?

Back

The chemical formula is Cr2O3.

Front

What can be concluded about Solid X and Solid Y based on their bonding types?

Back

Solid X contains only ionic bonds, and Solid Y contains only covalent bonds.

Front

How many electrons are in the outermost energy level of a neutral carbon atom?

Back

A neutral carbon atom has 4 electrons in its outermost energy level.

Front

What is the principle behind the emission spectrum of hydrogen?

Back

The emission spectrum is produced when electrons transition between energy levels, emitting light at specific wavelengths.

Front

Define radioactive decay.

Back

Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation.

Front

What is an alpha particle?

Back

An alpha particle consists of 2 protons and 2 neutrons, equivalent to a helium nucleus.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Front

What is the significance of the outermost energy level in an atom?

Back

The outermost energy level determines the chemical reactivity and bonding behavior of the atom.