First 10 Elements
What is the name of the element with the symbol H?
Hydrogen
What are the three common states of matter?
Solid, liquid and gas
What is the smallest unit of an element that retains the properties of that element?
Atom
A pure substance containing only one type of atom is called what?
An element
What do we call two or more substances that are combined but not chemically bonded?
A mixture
What is the chemical symbol for Oxygen?
O
Which state of matter has a fixed shape and fixed volume?
Solid
What do we call two or more atoms chemically bonded together?
A molecule
Is oxygen (O₂) an element or a compound?
Molecule
Is air an element, compound or mixture?
Mixture
Which of the first 10 elements has an atomic number of 6?
Carbon
Which state has a fixed volume but takes the shape of its container?
Liquid
How many atoms are in one molecule of H₂O?
3 atoms
Water contains hydrogen and oxygen atoms chemically bonded together. Is water an element or compound?
Compound
Is salt water a mixture or compound?
Mixture
Put these elements in order of increasing atomic number: Neon, Lithium, Helium, Nitrogen.
Helium → Lithium → Nitrogen → Neon
What is the name of the change of state when a liquid becomes a gas?
Evaporation / vaporisation
How many atoms are in CO₂, and which elements are present?
3 atoms: 1 carbon and 2 oxygen atoms
What is the difference between an element and a compound?
An element contains one type of atom; a compound contains atoms of two or more different elements chemically bonded together.
Which one is the odd one out: O₂, H₂O, CO₂, Ne? Explain why.
Ne. It consists of single atoms, while the others exist as molecules.
Name the first 10 elements.
Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon
Explain what happens to particles when a solid such as ice is heated until it becomes a liquid.
The particles gain energy, move/vibrate faster and can move past one another.
What is the difference between an atom and a molecule?
An atom is a single particle of an element; a molecule contains two or more atoms chemically bonded together.
CO₂ contains carbon and oxygen. Explain why it is a compound rather than a mixture.
Carbon and oxygen atoms are chemically bonded together in a fixed arrangement/ratio.
Classify each as an element, compound or mixture: oxygen gas, water, air, carbon dioxide, salt water.
Oxygen = element; Water = compound; Air = mixture; Carbon dioxide = compound; Salt water = mixture.