Honors Chemistry Midterm 2024

Front

What is the conversion factor from kilometers to centimeters?

Back

1 km = 100,000 cm, therefore 50 km = 5,000,000 cm.

Front

What are isotopes?

Back

Isotopes are atoms of the same element that have the same atomic number but different numbers of neutrons.

Front

How do you calculate the frequency of light given its wavelength?

Back

Use the formula: frequency (ν) = speed of light (c) / wavelength (λ). For yellow light with a wavelength of 645 nm, frequency = 3.00 x 10^8 m/s / 645 x 10^-9 m = 4.65 x 10^14 Hz.

Front

Convert 0.000240 to scientific notation.

Back

2.40 x 10^{-4} with 3 significant figures.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the highest s and p orbitals of an atom, which determine its chemical properties.

Front

What is the speed of light in a vacuum?

Back

The speed of light in a vacuum is approximately 3.00 x 10^8 m/s.

Front

Define atomic number.

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 difference between mass number and atomic number?

Back

Mass number is the total number of protons and neutrons in an atom's nucleus, while atomic number is the number of protons.

Front

What is scientific notation?

Back

Scientific notation is a way of expressing numbers as a product of a number between 1 and 10 and a power of 10.

Front

How do you determine the number of significant figures in a measurement?

Back

Significant figures include all non-zero digits, any zeros between significant digits, and trailing zeros only if there is a decimal point.