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?
The subatomic particles (the parts of an atom.)
What are protons, neutrons, and electrons.
Matter can neither be _____________ nor ______________.
What is created, destroyed OR made, lost.
This tells the number of protons in an atom.
What is the atomic number?
A mixture in which a material is dissolved. Homogenous mixture.
What is a solution?
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.
Shows how many of an element are in a molecule
What is the subscript?
Neutral on the pH scale.
What is 7?
A mixture that is not evenly mixed.
What is a heterogeneous mixture?
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.
Shows how many molecules there are of a particular chemical.
What is the coefficient?
Elements that are shiny, conduct electricity and heat, are malleable and ductile.
What are metals?
The smallest particle of a compound that retain the properties of the compound.
What are molecules?
What are three ways to affect the rate of a chemical reaction?
Change the temperature, change the surface area, change the concentration, add a catalyst
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 particles that determine the atomic mass of an atom.
What are protons and neutrons?
How could you isolate salt from sea water?
What is heat it, boil it or let it evaporate. (Any one of these are correct!)
Two or more elements bonded together in specific ratios
What are compounds?
The outermost electrons in an atom- the ones that participate in chemical reactions
What are valence electrons?
The balanced equation for
N2 + H2 ---> NH3
What is
N2 + 3H2 ---> 2 NH3
Elements that do not readily bond with other elements. Group 18 on the far right of the periodic table.
What are noble gases?