noun – a small piece of matter (often an atom or molecule)
What particle is central to the atomic bomb? How do you know?
noun – a substance that cannot be separated chemically into simpler substances
How many elements on the periodic table can you name?
noun – the smallest particle of an element
Which atoms combine to form water?
noun – a group of atoms linked together to form the smallest particle of a compound
A molecule of DNA has millions of atoms. Can you think of a molecule comprised of only two atoms?
noun – a substance made of definite proportions of two or more elements
Water is a chemical compound. Can you name the elements that combine to form water molecules?
adjective — made of particles, such as molecules and atoms (at a microscopic scale); or of small solid pieces like grains of sand (at a macroscopic scale)
At a particulate level, the density of a substance is determined by two things: how massive the particles of the substance are, and how closely packed or spread out those particles are.
adjective – without interruption
Why do you think water appears continuous, even though it is made of separate atoms?
noun — the preservation of some quantity despite some kind of transformation
We see the Law of the Conservation of Matter at play in photosynthesis when every atom of carbon dioxide and water that goes into the plant is accounted for in the sugars and oxygen it produces.
noun – (in chemistry) an interaction between substances that changes the connections between atoms
Why do some chemical reactions produce only one kind of new molecule, while others produce multiple?