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WorksheetsExploring Matter and Atoms
Total questions: 20
Worksheet time: 10mins
What is an element?
An element is a mixture of different atoms.
An element can be broken down into simpler substances.
An element is a type of molecule made of two or more atoms.
An element is a pure substance made of only one type of atom.
Name three properties of metals.
Non-magnetic (do not attract magnets)
Poor conductors of electricity
1. Good conductors of electricity and heat 2. Malleable (can be shaped) 3. Ductile (can be drawn into wires)
Brittle (easily breakable)
What distinguishes a molecule from a compound?
A molecule is always made of two or more different elements.
A compound can consist of the same elements only.
A molecule is a type of compound that contains only one element.
A molecule can consist of the same or different elements, while a compound specifically consists of different elements.
Give an example of a compound.
Oxygen (O2)
Water (H2O)
Sodium Chloride (NaCl)
Carbon Dioxide (CO2)
How is the periodic table organized?
The periodic table is organized by increasing atomic number and grouped by similar properties.
Organized by color and shape
Sorted by the number of electrons in each atom
Arranged randomly without any order
What does the atomic number represent?
The total mass of an atom.
The number of neutrons in an atom.
The number of protons in an atom.
The number of electrons in an atom.
Which element has the atomic number 1?
Helium
Carbon
Hydrogen
Oxygen
What is the chemical symbol for gold?
Au
Pb
Ag
Fe
How many elements are in the periodic table?
115
100
120
118
What is the difference between a chemical symbol and a chemical formula?
A chemical symbol represents a mixture, while a chemical formula represents a single substance.
A chemical symbol represents an element, while a chemical formula represents a compound.
A chemical symbol is a formula for a compound, while a chemical formula is a symbol for an element.
A chemical symbol is used only in organic chemistry, while a chemical formula is used in inorganic chemistry.
What is the significance of the periodic table's groups?
They show the physical state of elements at room temperature.
They categorize elements based on their color.
The significance of the periodic table's groups is that they indicate elements with similar chemical properties.
They represent the atomic number of elements.
Which group contains the noble gases?
Group 18
Group 3
Group 14
Group 1
What is the chemical formula for water?
NaCl
CO2
H2O
H2O2
How are elements arranged in the periodic table?
By increasing atomic number and by groups based on similar properties.
By the number of electrons in the outer shell
Randomly without any specific order
By decreasing atomic mass and by color
What is the atomic number of carbon?
12
6
8
5
What are diatomic molecules?
Molecules made up of three atoms
Molecules that exist only in solid form
Molecules that can be formed from any number of atoms
Diatomic molecules are molecules made up of two atoms.
What is the chemical symbol for sodium?
K
Ca
Cl
Na
What does the term 'compound' mean?
A single element in its purest form.
A substance formed from two or more elements chemically bonded together.
A mixture of different substances that are not chemically bonded.
A type of chemical reaction that produces energy.
Which element is represented by the symbol 'Fe'?
Copper
Gold
Lead
Iron
What is the main difference between ionic and covalent compounds?
Covalent compounds consist of charged ions, while ionic compounds are neutral molecules.
Ionic compounds have low melting points, whereas covalent compounds have high melting points.
Ionic compounds are formed by sharing electrons, while covalent compounds are formed by transferring electrons.
Ionic compounds involve electron transfer and ion formation, while covalent compounds involve electron sharing.
