Question

part 2: atomic structure & chemistry

1. name the three parts of an atom:
2. ____________
3. ____________
4. ____________
5. potassium (k)

atomic number: 19
atomic mass: 39
protons (p): ______
neutrons (n): ______
electrons (e): ______

1. calcium (ca)

atomic number:20
atomic mass: 40.943
protons (p): ______
neutrons (n): ______
electrons (e): ______

1. in the compound $3\text{ca}(\text{c}_2\text{h}_3\text{o}_2)_2$, how many atoms of each element are present?

calcium (ca): ______
carbon (c): ______
hydrogen (h): ______
oxygen (o): ______

1. balance the following chemical equation:

$\text{ch}_4 + \text{o}_2 \
ightarrow \text{co}_2 + \text{h}_2\text{o}$
balanced equation: ____________

Explanation:

Step1: Identify atom components

An atom's 3 core parts are protons, neutrons, electrons.

Step2: Calculate K subatomic particles

Protons = atomic number: $19$
Neutrons = mass - protons: $39 - 19 = 20$
Electrons = protons (neutral atom): $19$

Step3: Calculate Ca subatomic particles

Protons = atomic number: $20$
Neutrons = $\text{round}(40.943) - 20 = 21$
Electrons = protons (neutral atom): $20$

Step4: Count atoms in $3\text{Ca}(\text{C}_2\text{H}_3\text{O}_2)_2$

Ca: $3 \times 1 = 3$
C: $3 \times (2 \times 2) = 12$
H: $3 \times (3 \times 2) = 18$
O: $3 \times (2 \times 2) = 12$

Step5: Balance $\text{CH}_4 + \text{O}_2

ightarrow \text{CO}_2 + \text{H}_2\text{O}$
Balance C: already 1 on each side
Balance H: $\text{CH}_4 + \text{O}_2
ightarrow \text{CO}_2 + 2\text{H}_2\text{O}$
Balance O: $\text{CH}_4 + 2\text{O}_2
ightarrow \text{CO}_2 + 2\text{H}_2\text{O}$

Answer:

1. (Note: This question is cut off and cannot be answered)
2. Protons
3. Neutrons
4. Electrons

1. Potassium (K)

Protons (P): $19$
Neutrons (N): $20$
Electrons (E): $19$

1. Calcium (Ca)

Protons (P): $20$
Neutrons (N): $21$
Electrons (E): $20$

13.
Calcium (Ca): $3$
Carbon (C): $12$
Hydrogen (H): $18$
Oxygen (O): $12$

14.
Balanced equation: $\text{CH}_4 + 2\text{O}_2
ightarrow \text{CO}_2 + 2\text{H}_2\text{O}$