Problem Analysis:
The worksheet focuses on understanding the structure of atoms, molecules, and compounds. It requires identifying parts of an atom, determining elements based on proton counts, and classifying substances as atoms, molecules, or compounds.
---
Solution:
####
Part 1: Atom Structure
The diagram shows the basic structure of an atom with labeled parts:
-
Electrons: Negatively charged particles orbiting the nucleus.
-
Protons: Positively charged particles in the nucleus.
-
Neutrons: Neutral particles in the nucleus.
-
Nucleus: The central part of the atom containing protons and neutrons.
####
Counting Protons to Identify the Element
The question asks to count the protons in the nucleus and identify the element. From the diagram:
- There are
8 protons in the nucleus.
Using the periodic table:
- An atom with 8 protons is
oxygen (O).
So, the answers are:
- \# of Protons:
8
- Element:
Oxygen (O)
---
####
Part 2: Atoms, Molecules, and Compounds
#####
Definitions Recap:
1.
Atom: The smallest unit of matter that retains the properties of an element.
2.
Molecule: A group of two or more atoms bonded together.
3.
Compound: A molecule made up of atoms from different elements.
#####
Classifying Substances
The worksheet provides three examples:
NaCl,
Cl₂, and
Na. We need to classify each as an atom, molecule, or compound.
1.
NaCl:
- NaCl is composed of sodium (Na) and chlorine (Cl) atoms.
- Since it contains atoms from two different elements, it is a
compound.
2.
Cl₂:
- Cl₂ consists of two chlorine (Cl) atoms bonded together.
- Since it is made up of the same type of atom, it is a
molecule.
3.
Na:
- Na represents a single sodium atom.
- Since it is a single atom, it is an
atom.
So, the classifications are:
- NaCl:
Compound
- Cl₂:
Molecule
- Na:
Atom
---
#####
Identifying Elements
The worksheet also asks to identify the elements represented by the symbols
Na and
Cl:
-
Na stands for
Sodium.
-
Cl stands for
Chlorine.
---
Final Answers:
1.
Number of Protons:
8
2.
Element:
Oxygen (O)
3.
Classification:
- NaCl:
Compound
- Cl₂:
Molecule
- Na:
Atom
4.
Elements:
- Na:
Sodium
- Cl:
Chlorine
---
Boxed Final Answer:
\[
\boxed{
\begin{aligned}
&\text{Number of Protons: } 8 \\
&\text{Element: Oxygen (O)} \\
&\text{NaCl: Compound} \\
&\text{Cl}_2: \text{Molecule} \\
&\text{Na: Atom} \\
&\text{Na: Sodium} \\
&\text{Cl: Chlorine}
\end{aligned}
}
\]
Parent Tip: Review the logic above to help your child master the concept of stephen murray worksheet.
