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Lesson 2
Lesson 3
Lesson 5
Miscellaneous
100
A change in which the appearance of a substance changes but its chemical properties stay the same.
What is a physical change?
100
The type of charge an atom has when it has more protons than electrons.
What is a positive charge?
100
the chemical formula for table salt, aka sodium chloride.
What is NaCl?
100
a compound that reacts with metal to produce hydrogen.
What is an acid?
100
Chopping onions is an example of this kind of change.
What is a physical change
200
Two or more elements combined
What is a compound?
200
the charge of an atom that has more electrons that protons
What is a negative charge?
200
a group of two or more atoms that act like one atom
What is a radical?
200
used to determine if a substance is an acid or a base
What is an indicator?
200
Atoms in a radical group do this during a chemical reaction.
What is stay together?
300
the change that produces one or more new substances with new chemical properties
What is a chemical change?
300
an atom that has either a positive or negative charge
What is an ion?
300
The formula H2O has this many atoms
What is three?
300
a substance with a pH of 7 is said to be
What is neutral?
300
This kind of paper is used in laboratories to test compounds to tell if they are acids or bases.
What is Litmus?
400
The change that chopping onions represents
What is a physical change?
400
the attractive force between atoms
What is a chemical bond?
400
If no subscript number is given after the symbol of an element the compound has this many atoms of that element?
What is one?
400
Three characteristics of bases are:
What is: they feel slippery, taste bitter, contain the OH radical.
400
"They feel slippery" is a characteristic of this.
What is a base?
500
a silver spoon tarnishing is an example of this kind of change.
What is a chemical change?
500
This many electrons fill energy level K
What is 2 electrons?
500
Scientists use these to write a chemical formula for each compound.
What are symbols?
500
Characteristics of __________________: they taste sour, they contain hydrogen, and they react with metals to produce hydrogen.
What is an acid?
500
We used this as an indicator in our Acids and Bases lab.
What is cabbage juice?