inside an atom
what is the center if the atom called?
nucleus
Acid or base: this can burn and be corrosive
Acid
The chemical symbols and numbers abbreviating the name of a compound is called the _______ _________. Example H2O.
A) Chemical reaction
B) Molecular signature
C) Chemical formula
D) Molecular formula
C) Chemical formula
A(n) ___________ is a substance made of only one type of atom
an element
The process in which different types of atoms join and form a new substance is:
A) covalent bond
B) chemical change
C) decomposition reaction
C- chemical change (this can include a covalent bond, but it's not asking about the specific type of bond)
proton (positive proton)
inside the nucleus
Acid or base: This is bitter and slippery to touch
Base
The compound H2SO4 has ____ atoms of Oxygen in it.
4 atoms
The sum (adding) the number of protons and neutrons give the atom's approximate:
A) pH scale
B) electrons
C) atomic number
D) atomic mass
D - atomic mass
(atomic number is the number of PROTONS in the nucleus and also ELECTRONS in the cloud)
true or false: an atom that has lost or gained electrons is called a molecule
FALSE: an element that has lost or gained electrons is an ION
IONS can be positively charged (lost an electron) or negatively charged (gained an electron)
what is the neutral part of the atom, and where is it found?
neutron (neutral neutron)
found in the nucleus
What scale do you use to determine the concentration of acids or bases in a solution?
the pH scale
Molecules comine in this kind of reaction to form new substances:
A) ionic reaction
B) covalent reaction
C) single replacement reaction
D) synthesis reaction
D) synthesis reaction
The molecule is being synthesized
(ionic and covalent are types of bonds, not reactions)
(single replacement reactions are when one element replaces another in a chemical reaction)
What are 2 things you can tell about an element based on its location on the periodic table? Hint: periods and groups
It's period (rows across) tell how many shells of electrons the element has
Its rows (up and down) tell how many electrons are in the outer shell
Groups tell about similar physical and chemical properties
When acid and base molecules react, they create this, which is also the word for a food seasoning.
SALT!
what is the negative part of the atom, and where is it found?
electron (e-less-tron... negative... minus... get it?)
found whizzing around in the outer shells of the atom
What is a substance that changes color when exposed to acids or bases in solution? Can you give an example?
an indicator: pH universal indicator paper, litmus paper, cabbage juice
Why are all compounds molecules, but not all molecules are compounds?
Some molecules are made when atoms of the same element are combined.
Others are made when different elements combine with a chemical reaction.
Compounds are made when a chemical change (reaction) occurs.
This scientist developed the periodic table of elements:
A) niels bohr
B) dmitri mendeleev
C) ernest rutherford
D) robert boyle
B - Dmitri Mendeleev
(Niels Bohr developed the simplified model of the atom - called a Bohr model)
Match the bonds to their definitions: ionic and covalent
A) shares electrons
B) + and - charged ions attract each other
Covalent shares electrons
Ionic + and - ions attract each other like a magnet
true or false: an atom is the smallest piece of an element that can be recognized as that element
true; an atom is the smallest building block of elements
You get a chemical burn from using some cleaning acids. What is something from your kitchen or bathroom that would help relieve the pain caused by the caustic acid, and why would it work?
Baking soda or milk based things would help to neutralize the acid and stop the burn
A ____ reaction occurs when a compound is broken down into simpler compounds.
A) synthesis
B) replacement
C) decomposition
D) combustion
If the element Sodium (Na) has 11 protons, how many electrons does it have?
11 electrons
In a normal atom, one that is not an ion, it has the same number of protons as electrons
11 is the atomic number of the element Sodium, so this tells us the number of protons and the number of electrons.
If an atom's outermost shell is completely filled, that shell is closed, and the atom cannot form a compound with another atom. This is considered _____. Certain gases are considered this kind of atom.
A) stable
B) noble
C) incapable
D) complete
C)
A) stable
The atoms at the last period of the table are generally stable.