Atoms
Chemistry mystery
Acids and Bases
Periodic Table
Physical or chemical
100
This is a small particle that makes up all matter on earth.
What is an atom?
100
A pure substance made up of only one kind of atom.
What is an element?
100
What is the range of the pH scale?
0-14
100
The vertical columns on the periodic table are called what?
families/groups
100
The only sign that a chemical reaction has occurred is this
A new substance is formed
200
This is an uncharged particle in the nucleus of the atom.
What is a neutron?
200
This is how you find the number of neutrons of an element
What is subtract the atomic number/number of protons from the atomic mass?
200
This substance has a sour taste and is corrosive to metals
What is an acid
200
This is the number of protons in the nucleus of each atom of an element.
What is the atomic number?
200
A change in the property but not the substance is called this
what is a physical change
300
The center of an atom is called what?
The nucleus
300
In this type of chemical reaction energy is released and the temperature usually increases
What is exothermic
300
What is one characteristic of a base?
It is slippery, soapy, tastes bitter
300
This is the sum of the an atom's protons and neutrons.
What is atomic mass/weight?
300
The ability for a substance to undergo a chemical change is called this
Chemical property
400
This is a positively charged particle in the nucleus of the atom
What is a proton?
400
What are the 5 signs of a chemical change?
Color change odor change bubbles temperature change formation of a solid-precipitate
400
A substance that is not an acid or a base has what pH?
What is 7
400
Most elements on the periodic table are what?
What are metals
400
The number of what defines what an element is?
protons
500
This is a negatively charged subatomic particle located around the nucleus.
What is an electron?
500
Who made the first periodic table of Elements?
Demitri Mendeleev
500
What happens when an acid and a base are combined?
they neutralize each other form water and salt
500
How is the periodic table arranged?
What is increasing atomic number
500
A candle melting is what kind of change?
physical
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