Vocabulary Terms
the smallest piece of an element that can be recognized as that element.
atom
What are the three parts of an atom?
Electrons, protons, neutrons. (know where each or located in an atom)
If the element sodium has 11 protons, how many electrons does it have? How do you know?
11 electrons, an element has the same number of protons and electrons.
What is the process in which different types of atoms join and form a new substance called?
Chemical change (reaction)
Which one is not an acid:
lemons, bleach, or vinegar
Bleach
a substance with only one kind of atom
element
Which scientist developed a simplified model of an atom?
Neils Bohr
The C on the periodic table of elements represents the element Carbon. The letter C is known as the _______ on the periodic table of elements.
the chemical symbol
Change in color
Energy is produced
bubbles form
a new substance is formed
odor is produced
You can determine the concentration of acids or bases in a solution by using ___________.
the pH scale
A substance that changes color when exposed to acid or base solutions is called a(n)?
indicator
The sum of the number of protons and neutrons in an atom make up its _____________ number.
Atomic
Why do some chemical symbols not match the element's name on the periodic table of elements?
The greek or latin word for the element is used so chemical symbols are not repeated.
Ex:
Sodium - NA (Latin NA used because S is already used for sulfur)
Sulfur- S
The compound H2CO3 has how many atoms of carbon in it?
Does the following describe an acid or a base:
a substance is slippery to the touch and has a bitter taste
a base
chemical symbols and numbers abbreviating the name of a compound
chemical formula
How many electrons can fill the first shell of an atom?
How many electrons can fill the second shell of an atom?
2 in the first
8 in the second
What are two things you can tell about an element based on it's location on the periodic table. (Hint: think periods and groups)
The period tells you the number of shells the element has.
The group tells you how many electrons are in the outer shell.
Which kind of chemical reaction occurs when a compound is broken down into simpler compounds?
Decomposition reactions.
Describe the touch and taste of an acid substance.
Acid can burn and be corrosive and has a sour taste.
an atom that has gained or lost electrons
ion
Covalent bond
In an attempt to organize all known elements, scientist, _______________ developed the periodic table to elements.
Dmitri Mendeleev
Explain why all compounds are molecules but not all molecules are compounds.
A molecule has more than one atom. If the atoms are different they are compounds. However, if a molecule has more than one of the SAME type of atom, it is an element, not a compound.
What ionic compound is produced from a reaction between an acid and a base?
A salt.