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Physical or Chemical Change?
Moles
Density, Mass, Volume
Basics of Chemistry
Counting Atoms
100
Glass breaks
Physical change
100
The SI unit of amount of substance
Mole
100
How do you calculate density? (the formula) *Hint: remember the triangle*
Density = Mass/Volume
100
Protons, neutrons and electrons are all parts of
An atom
100
How many total atoms are in: H20
3 total atoms (2 hydrogen atoms, 1 oxygen atom)
200
A nail rusts
Chemical change
200
The sum of the atomic masses of all the atoms in a formula for a covalent compound is the ........
Molecular Mass or Molar Mass
200
A block of wood has a mass of 35 grams and volume of 7 cm3. Calculate the density.
M=35g D=? V=7cm3 Density = Mass/Volume = 35/7 = 5g/cm3
200
A pure substance made of ONE KIND OF ATOM that cannot be broken down chemically is known as
An element
200
How many total atoms are in: (SO4)2
10 atoms total S= 2 atoms, O= 8 atoms 2+8 = 10 atoms)
300
Paper burns
Chemical change
300
Avogadro's number
6.02 E23
300
What is the density of an object with a mass of 60 grams and a volume of 2cm3?
M= 60g Density = Mass/Volume D= ? = 60/2 V= 2cm3 = 30g/cm3
300
A tool used by scientists that organizes more than 100 elements is called
The Periodic Table
300
How many atoms total are in: NaCl
2 atoms total Na= 1, Cl= 1
400
Water boils at 100 degrees Celsius
Physical change
400
What is the molecular mass of MgSO4
Mg = 24.3 S = 32.1 O = 16
120.4 g/mol
400
The density of Iron is 7.87 g/cm3. What is the mass of iron if its volume is 2500cm3?
M= ? Mass = Density x Volume D= 7.87 g/cm3 = 7.87 x 2500 V= 2500 cm3 = 19675 g
400
A substance made of TWO OR MORE ATOMS joined by a covalent bond is known as
A molecule or compound
400
How many atoms total are in: K3PO4
8 atoms total (K= 3 atoms, P= 1 atom, O= 4 atoms 3+1+4= 8 atoms)
500
What are the 5 signs that a chemical change has occurred?
- Heat or light is given off - A precipitate forms - Change in temperature - Bubbles of gas appear - Change in colour
500
How many grams of NaCl are present in 11.00 moles?
11 moles NaCl X 58.45 g NaCl = 642.9 g NaCl
500
Mercury has a density of 13.5 g/cm3. How much space would 50g of mercury occupy? *Hint: look at the units of measure to find out what you're looking for*
M= 50g Volume = Mass/Density D= 13.5g/cm3 = 50/13.5 V= ? = 3.70cm3
500
A pH of 1 means that the substance is very .....
Acidic
500
How many total atoms are in: Al2(SO4)3
17 atoms (Al= 2, S= 3, O= 12 2+3+12= 17)