Atoms
What is Chemistry?
The study of Matter- what is is made of, its characteristics, and how it reacts with others.
Why do scientists use chemical symbols?
Symbols are quicker to use and they make communication with other scientists around the world easier.
Who came up with the method of classifying elements? *The last name is just fine, spelling will not be counted against.
what is a group of atoms joined together called?
a molecule
What do the small subscripts tell you in a formula?
Can an element have more than one atom? Explain.
Yes, but all the atoms are the same kind.
If an element has two letters, how is the chemical symbol written?
The first letter is capitalized and the second is lower cased.
How do scientists today arrange the periodic table?
By atomic number
What occurs when different atoms are joined together
A chemical change or chemical reaction
What is a chemical reaction?
The process through which different types of atoms join together.
Why do normal atoms usually not have an electrical charge?
A normal atom has equal number of protons and electrons.
What is the basis for many chemical symbols?
The element's English name
What do all elements in a group have in common?
They all have the same number of electrons in their outer shell.
Describe a compound
A molecule with atoms from two or more different elements
What are the What happens during a synthesis reaction?
molecules combine to form new substances
How is the atomic number different from the atomic mass?
The atomic mass is found by adding the number of protons and neutrons together. The atomic number is the # of protons only.
Why is a second letter sometimes included in the chemical symbol of an element?
Some elements begin with the same letter.
Metals, non-metals, and metalloids
What is the most common compound on Earth?
Water or H2O
What is the difference between a single replacement and a double replacement reaction?
In a single replacement, only one element is replaced while a double replacement sees two elements switch places.
What is the Atomic Theory based on?
The repeated observations of how atoms act in experiments.
How many elements are there? *Closest answer receives the credit.
118
What are 3 characteristics of metals?
Usually solid at room temp, require high temp to melt, good conductors of heat and electricity, easily combined with other elements.
What properties makes Hydrogen and Oxygen different from each other?
Hydrogen is a flammable gas and Oxygen helps things burn.
What is the difference between a synthesis and decomposition reaction?
In a synthesis reaction, molecules combine to form a new compound while a decomposition reaction breaks a compound down into simpler parts.