Elements, Mixtures and compounds
The smallest unit of matter which has properties of a chemical element.
What is an atom?
These are the ingredients of a reaction; they are on the left side of the arrow.
What are reactants?
Three parts of an atom
What are protons, neutrons, and electrons.
The atomic number of Carbon.
6
This tells the number of protons in an atom.
What is the atomic number?
NaCl is an example of this class of compounds.
What is a salt or ionic compound?
A process that involves the rearrangement of atoms to form new substances.
What is a chemical reaction?
The inner part of an atom, composed of protons and neutrons.
What is the nucleus.
The number of protons in Calcium.
20
Anything that has mass and takes up space is a kind of
What is matter?
Hydrogen and Neon are examples of what state of matter at room temperature.
What is a gas?
The symbolic representation of a chemical reaction using symbols and chemical formulas.
What is a chemical equation?
The charge of an electron.
What is negative.
The number placed below after a symbol in a chemical reaction is called
What is a subscript?
These cannot be broken down into simpler substances; everything around us is made up of combinations of them.
What are elements or atoms?
Soil and air are examples of what type of material.
What are mixtures?
This kind of reaction absorbs energy. (Heat enters.)
What is endothermic?
The charge of a neutron.
What is no charge or neutral.
List at least 3 indicators of a chemical change.
What are color change, gas is produced (smell or bubbles or fizz), a solid is formed, bright light or temperature change, etc.
The study of matter and how it changes is called
What is chemistry?
How could you isolate salt from sea water?
What is heat it, boil it or let it evaporate. (Any one of these are correct!)
How many atoms are in Mg2Cl2
4
Atoms share these when they bond.
What are electrons?
How many neutrons does an atom with an atomic number of 6 and an atomic mass of 12 have?
6
The smallest unit of a compound is called
What is a molecule?