Elements, Compounds and Molecules
The number of atoms in a compound.
What is 2 or more?
This chart organizes all the known elements.
What is the Periodic Table of Elements?
The simplest form of matter that cannot be broken down into simpler substances.
This law states that matter cannot be created or destroyed in a chemical reaction or physical change, only transformed.
What is the Law of Conservation of Matter?
The starting materials in a chemical reaction are known by this term.
What are reactants?
A single element but with 2 atoms bonded together.
What is molecules?
Elements that are found in the same vertical column on the periodic table often act alike and are called by the same name.
What are groups or families?
A substance formed when two or more different elements are chemically bonded together.
What is a compound?
If a sealed container has 10 grams of baking soda and 10 grams of vinegar, this is the total mass of the contents after the reaction occurs.
What is 20 grams?
This arrow symbol, mostly found in a chemical equation, means yields or produces.
What is →?
The number of atoms an element has.
What is one atom
The periodic table arranges elements by this number which tells you how many protons are in an atom.
What is the atomic number?
Gold (Au) is found in the periodic table and is an example of this type of pure substance.
What is an element?
In a chemical reaction, if you start with 50 grams of reactants, you should end up with that much mass in products.
What is 50 grams?
When you see bubbles, a change in color, or a new smell when things mix, these are signs that this is happening.
What is a chemical reaction?
The chemical equation of water.
What is H2O?
You can usually find shiny, bendable elements that conduct electricity well on this side of the periodic table.
What are metals?
Salt (NaCl) is a compound because it is made of these two elements chemically combined.
What are Sodium and Chlorine?
When ice melts into water, the total mass remains constant because the matter has gone through this type of change.
The number placed in front of a chemical formula that multiplies a variable or quantifies a property of a substance or process
What is a coefficient?
True or False: A molecule is the same as a compound as it has to have at least 2 atoms.
What is False?
This essential gas, with the symbol O, is what we breathe to live and is found on the periodic table.
What is Oxygen?
The chemical formula is C₁₂H₂₂O₁₁, which is?
What is sugar?
If you dissolve salt in water, the mass of the resulting saltwater solution is equal to the sum of the masses of these two initial components.
What are the salt and the water?
This is a sign of when something burns, like wood in a fire, you see smoke and ash, which are new things made from old things.
What is a chemical change/reaction?