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WorksheetsUnit 2-3 Test
Total questions: 15
Worksheet time: 4hrs 45mins
The Law of Conservation of Mass/ Matter states:
Matter is made of atoms
Matter cannot be created nor destroyed, it can only be transformed.
Matter is useless
Matter can be created and destroyed.
Identify the elements in NaCl
Na, Cl
N, a, C, L
N, C
Na
What is an element?
One type of atom
A combination of atoms
Two or more atoms combined through chemical bonds
Identify the physical changes. Check all that apply.
Condensation of steam
burning of gasoline
souring of milk
dissolving of sugar in water
melting of gold
Identify the chemical changes. Check all that apply.
Condensation of steam
burning of gasoline
souring of milk
dissolving of sugar in water
melting of gold
Identify the physical changes
coal burning
ice melting
mixing chocolate syrup with milk
explosion of a firecracker
water becoming ice
Identify the chemical changes
coal burning
ice melting
mixing chocolate syrup with milk
explosion of a firecracker
water becoming ice
Is the process of ice melting a physical or chemical property?
physical
chemical
How many protons in P-31?
15
16
31
19
How many electrons in P-31?
15
16
31
19
How many neutrons in P-31?
15
16
31
19
What is the atomic number of P?
15
16
31
19
What is the mass number of P-31?
15
16
31
19
Calculate the atomic mass of magnesium. The three magnesium isotopes have atomic masses and relative abundances of 23.985 amu (78.99%), 24.986 amu (10.00%) and 25.982 amu (11.01 %).
24.31 amu
24.31
24 amu
25 amu
Np-237 produces an α particle
91233Pa + 24He
24He
91234Pa
95241Am + 24He
