Which of the following is an example of a chemical change?
a) Boiling water
b) Dissolving sugar in water
c) Melting ice
d) Burning wood
Answer: d) Burning wood
What is the SI unit of temperature?
a) Celsius
b) Kelvin
c) Fahrenheit
d) Rankine
Answer: b) Kelvin
Which of the following is an example of a heterogeneous mixture?
a) Saltwater
b) Air
c) Vinegar
d) Soil
Answer: d) Soil
The process of converting a gas to a liquid is called:
a) Evaporation
b) Condensation
c) Sublimation
d) Deposition
Answer: b) Condensation
Which subatomic particle has a positive charge?
a) Proton
b) Neutron
c) Electron
d) Nucleus
Answer: a) Proton
What is the chemical symbol for gold?
a) Au
b) Ag
c) Hg
d) Fe
Answer: a) Au
Which of the following elements is a metal?
a) Carbon
b) Oxygen
c) Chlorine
d) Sodium
Answer: d) Sodium
What is the atomic number of oxygen?
a) 6
b) 8
c) 16
d) 32
Answer: b) 8
The pH scale is used to measure the acidity or alkalinity of a substance. What is the pH value of a neutral solution?
a) 0
b) 7
c) 14
d) 10
Answer: b) 7
Which of the following is an example of an exothermic reaction?
a) Photosynthesis
b) Combustion
c) Electrolysis
d) Respiration
Answer: b) Combustion
What is the chemical formula for water?
a) H2O
b) CO2
c) NaCl
d) CH4
Answer: a) H2O
Which of the following is an example of a renewable energy source?
a) Coal
b) Natural gas
c) Solar power
d) Petroleum
Answer: c) Solar power
The process of combining elements to form a new substance is called:
a) Decomposition
b) Synthesis
c) Ionization
d) Reduction
Answer: b) Synthesis
What is the molar mass of carbon dioxide (CO2)?
a) 16 g/mol
b) 22 g/mol
c) 44 g/mol
d) 12 g/mol
Answer: c) 44 g/mol
Which of the following is the correct electron configuration for nitrogen (N)?
a) 1s2 2s2 2p3
b) 1s2 2s2 2p6
c) 1s2 2s2 2p5
d) 1s2 2s2 2p4
Answer: a) 1s2 2s2 2p3
What is the process of converting a solid directly to a gas without going through the liquid phase called?
a) Melting
b) Sublimation
c) Evaporation
d) Condensation
Answer: b) Sublimation
Which of the following is an example of an endothermic reaction?
a) Freezing water
b) Rusting iron
c) Digesting food
d) Mixing vinegar and baking soda
Answer: a) Freezing water
The process of removing impurities from a substance by heating it to a high temperature is called:
a) Filtration
b) Distillation
c) Crystallization
d) Sublimation
Answer: b) Distillation
Which of the following is an example of a homogeneous mixture?
a) Orange juice with pulp
b) Granite
c) Air
d) Sand and water
Answer: c) Air
What is the chemical formula for methane?
a) CH4
b) C2H6
c) CO2
d) H2O
Answer: a) CH4
Which of the following is a strong acid?
a) Acetic acid (CH3COOH)
b) Hydrochloric acid (HCl)
c) Carbonic acid (H2CO3)
d) Sulfuric acid (H2SO4)
Answer: d) Sulfuric acid (H2SO4)
Which of the following is a noble gas?
a) Helium
b) Nitrogen
c) Oxygen
d) Carbon
Answer: a) Helium
The process of a substance changing from a gas to a solid without going through the liquid phase is called:
a) Melting
b) Sublimation
c) Evaporation
d) Condensation
Answer: b) Sublimation
Which of the following is the correct electron configuration for sodium (Na)?
a) 1s2 2s2 2p6 3s1
b) 1s2 2s2 2p6 3s2
c) 1s2 2s2 2p6 3s3
d) 1s2 2s2 2p6 3s0
Answer: a) 1s2 2s2 2p6 3s1
What is the formula for the compound calcium chloride?
a) CaCl
b) CaCl2
c) Ca2Cl
d) Ca2Cl2
Answer: b) CaCl2
Which of the following elements is a halogen?
a) Sodium (Na)
b) Chlorine (Cl)
c) Magnesium (Mg)
d) Aluminum (Al)
Answer: b) Chlorine (Cl)
What is the atomic number of hydrogen?
a) 1
b) 2
c) 6
d) 8
Answer: a) 1
Which of the following is an example of a physical change?
a) Rusting of iron
b) Burning of wood
c) Freezing of water
d) Digestion of food
Answer: c) Freezing of water
What is the SI unit of pressure?
a) Pascal
b) Joule
c) Newton
d) Kilogram
Answer: a) Pascal
Which of the following is the correct electron configuration for oxygen (O)?
a) 1s2 2s2 2p3
b) 1s2 2s2 2p6
c) 1s2 2s2 2p5
d) 1s2 2s2 2p4
Answer: c) 1s2 2s2 2p5
Which of the following is a greenhouse gas?
a) Oxygen (O2)
b) Nitrogen (N2)
c) Carbon dioxide (CO2)
d) Argon (Ar)
Answer: c) Carbon dioxide (CO2)
What is the chemical formula for table salt?
a) NaCl
b) KCl
c) CaCl2
d) HCl
Answer: a) NaCl
Which of the following is an example of an alkali metal?
a) Sodium (Na)
b) Chlorine (Cl)
c) Calcium (Ca)
d) Aluminum (Al)
Answer: a) Sodium (Na)
Which of the following is the correct electron configuration for helium (He)?
a) 1s1
b) 1s2
c) 1s2 2s1
d) 1s2 2s2
Answer: b) 1s2
The process of separating a mixture based on the differences in boiling points of its components is called:
a) Filtration
b) Decantation
c) Distillation
d) Sublimation
Answer: c) Distillation
What is the chemical formula for sulfuric acid?
a) H2O
b) HCl
c) H2SO4
d) HNO3
Answer: c) H2SO4
Which of the following is an example of a non-metal?
a) Sodium (Na)
b) Chlorine (Cl)
c) Magnesium (Mg)
d) Aluminum (Al)
Answer: b) Chlorine (Cl)
The process of a substance changing from a liquid to a gas is called:
a) Melting
b) Sublimation
c) Evaporation
d) Condensation
Answer: c) Evaporation
Which of the following is an example of a chemical property?
a) Density
b) Color
c) Flammability
d) Hardness
Answer: c) Flammability
What is the chemical formula for carbon monoxide?
a) CO2
b) CO
c) C2H6
d) H2O
Answer: b) CO
Which of the following is a transition metal?
a) Sodium (Na)
b) Chlorine (Cl)
c) Iron (Fe)
d) Aluminum (Al)
Answer: c) Iron (Fe)
What is the atomic number of carbon?
a) 6
b) 8
c) 16
d) 32
Answer: a) 6
Which of the following is an example of an alloy?
a) Gold
b) Silver
c) Bronze
d) Copper
Answer: c) Bronze
What is the SI unit of energy?
a) Pascal
b) Joule
c) Newton
d) Kilogram
Answer: b) Joule
Which of the following is the correct electron configuration for fluorine (F)?
a) 1s2 2s2 2p3
b) 1s2 2s2 2p6
c) 1s2 2s2 2p5
d) 1s2 2s2 2p4
Answer: c) 1s2 2s2 2p5
What is the process of a gas changing directly to a solid without going through the liquid phase called?
a) Melting
b) Sublimation
c) Evaporation
d) Condensation
Answer: b) Sublimation
Which of the following is an example of a physical property?
a) Reactivity
b) Flammability
c) Density
d) Corrosiveness
Answer: c) Density
The process of separating solid particles from a liquid by passing it through a porous material is called:
a) Filtration
b) Decantation
c) Distillation
d) Sublimation
Answer: a) Filtration
Which of the following is an example of a compound?
a) Oxygen (O2)
b) Nitrogen (N2)
c) Carbon dioxide (CO2)
d) Argon (Ar)
Answer: c) Carbon dioxide (CO2)
What is the chemical formula for hydrochloric acid?
a) H2O
b) HCl
c) H2SO4
d) HNO3
Answer: b) HCl
Which of the following is an example of a metalloid?
a) Sodium (Na)
b) Chlorine (Cl)
c) Silicon (Si)
d) Aluminum (Al)
Answer: c) Silicon (Si)
What is the atomic number of nitrogen?
a) 6
b) 8
c) 16
d) 7
Answer: d) 7
The process of a substance changing from a liquid to a solid is called:
a) Melting
b) Sublimation
c) Evaporation
d) Freezing
Answer: d) Freezing
Which of the following is the correct electron configuration for chlorine (Cl)?
a) 1s2 2s2 2p3
b) 1s2 2s2 2p6
c) 1s2 2s2 2p5
d) 1s2 2s2 2p4
Answer: c) 1s2 2s2 2p5
What is the process of converting a liquid to a gas called?
a) Melting
b) Sublimation
c) Evaporation
d) Condensation
Answer: c) Evaporation
Which of the following is an example of a chemical property?
a) Density
b) Color
c) Flammability
d) Hardness
Answer: c) Flammability
What is the chemical formula for ammonia?
a) NH4
b) NH3
c) H2O
d) CO2
Answer: b) NH3
Which of the following is an example of a transition metal?
a) Sodium (Na)
b) Chlorine (Cl)
c) Iron (Fe)
d) Aluminum (Al)
Answer: c) Iron (Fe)
What is the atomic number of oxygen?
a) 6
b) 8
c) 16
d) 32
Answer: b) 8
Which of the following is an example of an alloy?
a) Gold
b) Silver
c) Bronze
d) Copper
Answer: c) Bronze
What is the SI unit of power?
a) Pascal
b) Joule
c) Newton
d) Watt
Answer: d) Watt
Which of the following is the correct electron configuration for sodium (Na)?
a) 1s2 2s2 2p6 3s1
b) 1s2 2s2 2p6 3s2
c) 1s2 2s2 2p6 3s3
d) 1s2 2s2 2p6 3s0
Answer: a) 1s2 2s2 2p6 3s1
What is the chemical formula for sodium chloride?
a) NaCl
b) KCl
c) CaCl2
d) HCl
Answer: a) NaCl
Which of the following is a halogen?
a) Sodium (Na)
b) Chlorine (Cl)
c) Magnesium (Mg)
d) Aluminum (Al)
Answer: b) Chlorine (Cl)
What is the atomic number of hydrogen?
a) 1
b) 2
c) 6
d) 8
Answer: a) 1
Which of the following is an example of a physical change?
a) Rusting of iron
b) Burning of wood
c) Freezing of water
d) Digestion of food
Answer: c) Freezing of water
What is the process of separating a mixture based on the differences in boiling points of its components called?
a) Filtration
b) Decantation
c) Distillation
d) Sublimation
Answer: c) Distillation
What is the chemical formula for hydrochloric acid?
a) H2O
b) HCl
c) H2SO4
d) HNO3
Answer: b) HCl
Which of the following is an example of a non-metal?
a) Sodium (Na)
b) Chlorine (Cl)
c) Magnesium (Mg)
d) Aluminum (Al)
Answer: b) Chlorine (Cl)
The process of a substance changing from a liquid to a gas is called:
a) Melting
b) Sublimation
c) Evaporation
d) Condensation
Answer: c) Evaporation
