Matter & Mixtures
What type of mixture is sand and soil?
A) Element
B) Compound
C) Heterogeneous mixture
D) Homogeneous mixture
Heterogeneous mixture
In this reaction: Cu²⁺ + Fe → Cu + Fe²⁺, what happens to the Cu atoms?
A) Lose electrons
B) Gain electrons
C) Remain unchanged
D) React with oxygen
Gain electrons
Which gas is primarily consumed during car engine combustion?
A) Carbon dioxide
B) Nitrogen
C) Hydrogen
D) Oxygen
Oxygen
What is the chemical symbol for potassium?
A) P
B) K
C) Po
D) Pt
K
What is the molar mass of H₂O?
A) 10 g/mol
B) 18 g/mol
C) 16 g/mol
D) 2 g/mol
18 g/mol
What is the most abundant gas in Earth’s atmosphere?
A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Hydrogen
Nitrogen
How many water molecules are required to make one glucose molecule (C₆H₁₂O₆) in photosynthesis?
A) 3
B) 12
C) 6
D) 1
6
Elements in the same column of the periodic table:
A) Have the same number of protons
B) Have similar atomic masses
C) React the same with all substances
D) Have the same number of electrons
Have the same number of electrons
What is the coefficient for O₃ in the balanced equation 3O₂ → ___O₃?
A) 1
B) 2
C) 3
D) 4
2
Molarity is a measure of:
A) The mass of a solute
B) The weight of a solvent
C) The concentration
D) The temperature
The concentration
Which of the following is a chemical change?
A) Frying an egg
B) Freezing water
C) Dissolving sugar in water
D) Boiling alcohol
Frying an egg
The type of energy involved in motion is best classified as:
A) Potential energy
B) Kinetic energy
C) Chemical energy
D) Thermal energy
Kinetic energy
How many electrons does a Fe³⁺ ion have?
A) 26
B) 23
C) 29
D) 3
23
In a chemical equation, what does (aq) indicate?
A) Aqueous gas
B) A solid in water
C) A compound with acid properties
D) Dissolved in water
Dissolved in water
How many moles of O₂ are required to completely react with 128 g of CH₄?
A) 2.0
B) 8.0
C)16.0
D) 32.0
16.0
Helium (He) is a _______ at room temperature.
A) Gas
B) Liquid
C) Solid
D) Plasma
Gas
Which of the following is an endothermic process?
A) Combustion
B) Condensation
C) Photosynthesis
D) Freezing
Photosynthesis
What is the number of neutrons in the isotope ⁸⁰Br?
A) 35
B) 45
C) 80
D) 115
45
What is the monomer of polypropylene?
A) CH₂=CH–CH₃
B) C₂H₄
C) CH₄
D) CH₂=CH₂
CH₂=CH–CH₃
n the balanced equation C₈H₈ + ___O₂ → 8CO₂ + 4H₂O, what is the coefficient for O₂?
A) 8
B) 16
C) 4
D) 32
16
When water is put in the freezer and solidifies into ice cubes:
A) Heat is absorbed by the water
B) The temperature of the water increases
C) Heat has been given off by the water
D) The water evaporates
Heat has been given off by the water
Burning 1 mole of methane in oxygen releases 803 kJ. How much energy is released by burning 4 moles?
A) 803 kJ
B) 200 kJ
C) 1606 kJ
D) 3213 kJ – 803 × 4 = 3212 kJ (rounded)
3213 kJ or 3212 kJ
In the Second Law of Thermodynamics, "entropy" refers to the degree of:
A) Disorder
B) Energy
C) Pressure
D) Temperature
Disorder
The sharing of valence electrons between two atoms is known as:
A) Covalent bonds.
B) Ionic bonds
C) Metallic bonds
D) Hydrogen bonds
Covalent bonds
What is the volume, in liters, of 2 moles of an ideal gas at standard temperature and pressure (STP) (1 mole of gas occupies 22.4)?
A) 11.2 L
B) 12.5 L
C) 44.8 L
D) 22.4 L
44.8 L