Elements & Compounds
Counting Atoms
Physical & Chemical Changes
Aqueous Solutions
100
What is the smallest building block of all matter?
An atom
100
What does a subscript tell you?
How many atoms of each element there are
100
Which kind of change results is a change in physical properties?
Physical change
100
What is an aqueous solution?
A solution where the solvent is water
200
What is the difference between an element and a compound?
Elements only have one type of atom, while compounds have more than two different atoms
200
How many atoms are in this formula?
H2O
Three atoms:
Hydrogen = 2
Oxygen = 1
200
Name at least 3 evidence of a chemical change
Unexpected color change, gas production, light production, temperature change, odor production, precipitate formation
200
When making lemonade, lemon juice is the _______.
Solute
300
Cl2 is a _______. (TWO ANSWERS)
Molecule and element
300
How many SULFUR (S) atoms are in this formula: H2SO4
1 atom
300
Which kind of change is very difficult or impossible to reverse?
Chemical changes
300
A fully mixed hot cup of tea would be a _________.
Solution or Aqueous solution
400
What kind of particle is this? TWO ANSWERS.
Molecule and compound
400
How many atoms are in this formula: C4H10
14 atoms
400
Cooking dinner such as making hamburgers is a ___________ change.
Chemical change
400
The amount of solute in a solution is called ______
Concentration
500
How many compounds are in this formula?
CH4 + Cl2 --> CCl4 + HCl
Three compounds because Cl2 is a molecule.
500
How many atoms are in this formula: 2CaH2PO4
16 atoms
Ca=2, H=4, P=2, O=8
500
When two liquids mix and create a solid, that is called a ___________.
Precipitate
500
If I wanted to dilute my cup of coffee, I would add more __________
Solvent / Water