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Elements, Compounds, and Mixtures Online MCQs with Answers
Which of the following is an example of an element?
a) Water
b) Table salt
c) Oxygen
d) Sugar
What is the smallest unit of an element that retains its chemical properties?
a) Atom
b) Molecule
c) Compound
d) Electron
Which of the following is a compound?
a) Gold
b) Hydrogen gas
c) Carbon dioxide
d) Nitrogen
What is the chemical symbol for sodium?
a) S
b) N
c) Na
d) Ne
What is the term used to describe a pure substance composed of two or more elements chemically combined in a fixed ratio?
a) Element
b) Compound
c) Mixture
d) Solution
What is the chemical formula for water?
a) H2O2
b) CO2
c) H2O
d) CH4
Which of the following is a mixture?
a) Iron
b) Sugar
c) Air
d) Carbon
What is the chemical symbol for oxygen?
a) O2
b) O
c) H2O
d) C
What is the term used to describe a combination of two or more substances that are not chemically combined?
a) Element
b) Compound
c) Mixture
d) Solution
What is the chemical formula for carbon dioxide?
a) H2O2
b) CO2
c) H2O
d) CH4
Which of the following is a homogeneous mixture?
a) Salad dressing
b) Orange juice with pulp
c) Saltwater
d) Sand and water
What is the chemical symbol for helium?
a) H
b) He
c) He2
d) Cl
Which of the following is a heterogeneous mixture?
a) Vinegar
b) Milk
c) Soda
d) Salt and pepper mixture
What is the chemical formula for methane?
a) H2O2
b) CO2
c) H2O
d) CH4
What is the term used to describe a mixture that has a uniform composition throughout?
a) Homogeneous mixture
b) Heterogeneous mixture
c) Compound
d) Solution
Which of the following is a physical property of matter?
a) Reactivity
b) Flammability
c) Melting point
d) Combustibility
What is the chemical symbol for nitrogen?
a) N2
b) N
c) Na
d) Ne
What is the term used to describe a mixture that has a non-uniform composition throughout?
a) Homogeneous mixture
b) Heterogeneous mixture
c) Compound
d) Solution
Which of the following is a physical change?
a) Burning wood
b) Rusting iron
c) Boiling water
d) Digesting food
What is the chemical formula for table salt (sodium chloride)?
a) H2O2
b) CO2
c) NaCl
d) CH4
What is the term used to describe a change in the physical state of matter without a change in its chemical composition?
a) Physical change
b) Chemical change
c) Phase change
d) Reaction
Which of the following is a chemical property of matter?
a) Color
b) Density
c) Solubility
d) Reactivity
What is the chemical symbol for carbon?
a) C2
b) C
c) CO2
d) Ca
What is the term used to describe a change in matter that results in the formation of new substances with different chemical properties?
a) Physical change
b) Chemical change
c) Phase change
d) Reaction
What is the chemical formula for hydrogen peroxide?
a) H2O2
b) CO2
c) H2O
d) CH4
Which of the following is a characteristic of an element?
a) It can be separated into simpler substances by chemical means.
b) It is composed of two or more different types of atoms.
c) It can combine with other elements to form compounds.
d) It is a mixture of two or more elements.
What is the term used to describe a substance made up of only one type of atom?
a) Element
b) Compound
c) Mixture
d) Solution
What is the chemical symbol for chlorine?
a) C
b) Cl
c) CO2
d) Ca
Which of the following is a characteristic of a compound?
a) It can be separated into simpler substances by physical means.
b) It is composed of two or more different types of atoms.
c) It can combine with other compounds to form mixtures.
d) It is a mixture of two or more elements.
What is the chemical formula for calcium carbonate (limestone)?
a) H2O2
b) CO2
c) H2O
d) CaCO3
What is the term used to describe a mixture where one substance is dissolved in another?
a) Homogeneous mixture
b) Heterogeneous mixture
c) Compound
d) Solution
Which of the following is an example of a homogeneous mixture?
a) Granite
b) Soil
c) Air
d) Trail mix
What is the chemical symbol for iron?
a) I
b) Fe
c) CO2
d) Ca
Which of the following is a characteristic of a mixture?
a) It can be separated into its component substances by chemical means.
b) It is composed of two or more different types of atoms.
c) It can combine with other mixtures to form compounds.
d) It is a pure substance.
What is the term used to describe a substance that cannot be broken down into simpler substances by chemical means?
a) Element
b) Compound
c) Mixture
d) Solution
What is the chemical formula for carbon monoxide?
a) H2O2
b) CO2
c) H2O
d) CO
Which of the following is an example of a heterogeneous mixture?
a) Milk
b) Vinegar
c) Soda
d) Granite
What is the chemical symbol for gold?
a) G
b) Au
c) CO2
d) Hg
Which of the following is a characteristic of a solution?
a) It can be separated into its component substances by physical means.
b) It is composed of two or more different types of atoms.
c) It can combine with other solutions to form compounds.
d) It is a pure substance.
What is the chemical formula for mercury?
a) Hg
b) Me
c) CO2
d) Mg
What is the term used to describe the amount of solute dissolved in a solvent in a solution?
a) Concentration
b) Density
c) Mass
d) Volume
Which of the following is an example of a pure substance?
a) Air
b) Brass
c) Steel
d) Water
What is the chemical symbol for lead?
a) L
b) Pb
c) CO2
d) Hg
Which of the following is a characteristic of a pure substance?
a) It can be separated into its component substances by physical means.
b) It is composed of two or more different types of atoms.
c) It can combine with other pure substances to form mixtures.
d) It has a fixed composition and definite properties.
What is the chemical formula for sulfuric acid?
a) H2O2
b) CO2
c) H2SO4
d) CH4
Which of the following is an example of a heterogeneous mixture?
a) Sugar water
b) Coffee
c) Orange juice
d) Trail mix
What is the chemical symbol for silver?
a) Ag
b) Si
c) CO2
d) Al
Which of the following is a characteristic of a solution?
a) It can be separated into its component substances by chemical means.
b) It is composed of two or more different types of atoms.
c) It can combine with other solutions to form compounds.
d) It is a homogeneous mixture.
What is the chemical formula for ammonia?
a) H2O2
b) CO2
c) H2O
d) NH3
What is the term used to describe the process of separating the components of a mixture based on their boiling points?
a) Distillation
b) Filtration
c) Evaporation
d) Sublimation
Which of the following is an example of a pure substance?
a) Air
b) Saltwater
c) Bronze
d) Oxygen gas
What is the chemical symbol for potassium?
a) K
b) Ko
c) CO2
d) Pb
Which of the following is a characteristic of a mixture?
a) It has a fixed composition and definite properties.
b) It is composed of two or more different types of atoms.
c) It can combine with other pure substances to form compounds.
d) It can be separated into its component substances by physical means.
What is the chemical formula for glucose?
a) H2O2
b) CO2
c) H2O
d) C6H12O6
Which of the following is an example of a heterogeneous mixture?
a) Milk
b) Lemonade
c) Soda
d) Saltwater
What is the chemical symbol for copper?
a) C
b) Cp
c) Cu
d) Co
Which of the following is a characteristic of a compound?
a) It can be separated into its component substances by physical means.
b) It is composed of two or more different types of atoms.
c) It can combine with other compounds to form mixtures.
d) It is a pure substance.
What is the chemical formula for hydrochloric acid?
a) H2O2
b) CO2
c) H2O
d) HCl
What is the term used to describe the process of separating the components of a mixture based on their particle size?
a) Filtration
b) Distillation
c) Evaporation
d) Chromatography
Which of the following is an example of a pure substance?
a) Air
b) Brass
c) Granite
d) Carbon dioxide gas
What is the chemical symbol for mercury?
a) H
b) Me
c) Hg
d) Mg
Which of the following is a characteristic of a solution?
a) It has a fixed composition and definite properties.
b) It is composed of two or more different types of atoms.
c) It can combine with other pure substances to form mixtures.
d) It is a homogeneous mixture.
What is the chemical formula for nitric acid?
a) H2O2
b) CO2
c) H2O
d) HNO3
Which of the following is an example of a heterogeneous mixture?
a) Vinegar
b) Saltwater
c) Steel
d) Soil
What is the chemical symbol for helium?
a) H
b) He
c) He2
d) Cl
Which of the following is a characteristic of a pure substance?
a) It has a fixed composition and definite properties.
b) It is composed of two or more different types of atoms.
c) It can combine with other pure substances to form mixtures.
d) It can be separated into its component substances by physical means.
What is the chemical formula for sulfuric acid?
a) H2O2
b) CO2
c) H2SO4
d) CH4
Which of the following is an example of a homogeneous mixture?
a) Trail mix
b) Sand and water mixture
c) Milk
d) Orange juice with pulp
What is the chemical symbol for silver?
a) Ag
b) Si
c) CO2
d) Al
Which of the following is a characteristic of a solution?
a) It has a fixed composition and definite properties.
b) It is composed of two or more different types of atoms.
c) It can combine with other solutions to form compounds.
d) It is a homogeneous mixture.
What is the chemical formula for sodium hydroxide?
a) H2O2
b) CO2
c) H2O
d) NaOH
Which of the following is an example of a heterogeneous mixture?
a) Lemonade
b) Saltwater
c) Brass
d) Trail mix
What is the chemical symbol for potassium?
a) K
b) Ko
c) CO2
d) Pb
Which of the following is a characteristic of a compound?
a) It has a fixed composition and definite properties.
b) It is composed of two or more different types of atoms.
c) It can combine with other pure substances to form mixtures.
d) It can be separated into its component substances by physical means.
What is the chemical formula for hydrochloric acid?
a) H2O2
b) CO2
c) H2O
d) HCl
Which of the following is an example of a pure substance?
a) Air
b) Steel
c) Saltwater
d) Carbon dioxide gas
What is the chemical symbol for copper?
a) C
b) Cp
c) Cu
d) Co
Which of the following is a characteristic of a mixture?
a) It has a fixed composition and definite properties.
b) It is composed of two or more different types of atoms.
c) It can combine with other pure substances to form mixtures.
d) It can be separated into its component substances by physical means.
What is the chemical formula for sodium bicarbonate (baking soda)?
a) H2O2
b) CO2
c) H2O
d) NaHCO3
Which of the following is an example of a heterogeneous mixture?
a) Vinegar
b) Saltwater
c) Milk
d) Air