Question

your teams questions
use the information above to answer the following questions:

1. why do scientists use carbon - 12 as a standard for measuring atomic mass instead of trying to weigh every atom directly?
2. what does the piano analogy teach us about electrons?
3. if carbon - 12 has 6 protons and 6 neutrons, what is its mass number? what would the mass number be for carbon - 14 (6 protons, 8 neutrons)? what is the equation to calculate mass number?

the mass number of carbon - 12 is ______________.
the mass number of carbon - 14 is ______________.
the equation to calculate mass number is ______________.

Explanation:

Step1: Reason for using Carbon - 12 as standard

Atoms are extremely small and difficult to weigh directly. Carbon - 12 is chosen as a standard because it is stable and its mass can be precisely measured. One atomic mass unit (amu) is defined as $\frac{1}{12}$ of the mass of a carbon - 12 atom. This provides a convenient and consistent way to measure the relative masses of other atoms.

Step2: Piano analogy for electrons

The piano analogy teaches that electrons occupy specific energy levels (like piano keys have specific notes). Just as a piano has distinct keys that produce specific sounds, electrons can only occupy certain discrete energy levels in an atom and can jump between them by absorbing or emitting energy.

Step3: Calculate mass number

The mass number ($A$) of an atom is the sum of the number of protons ($p$) and neutrons ($n$). For Carbon - 12 with $p = 6$ and $n=6$, $A=p + n=6 + 6=12$. For Carbon - 14 with $p = 6$ and $n = 8$, $A=p + n=6+8 = 14$. The equation to calculate mass number is $A=p + n$.

Answer:

1. Atoms are too small to weigh directly. Carbon - 12 is stable and its mass defines 1 amu for relative mass measurement.
2. Electrons occupy discrete energy levels and can jump between them by absorbing or emitting energy.
3. The mass number of carbon - 12 is 12.

The mass number of carbon - 14 is 14.
The equation to calculate mass number is $A=p + n$.