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What is chemistry?
- A. The study of social interactions
- B. The study of matter and its changes
- C. The study of historical events
- D. The study of astrology
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Which of the following is a state of matter?
- A. Gold
- B. Liquid
- C. Temperature
- D. Chemical
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What is the smallest unit of an element?
- A. Molecule
- B. Atom
- C. Compound
- D. Solution
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Which of the following represents a chemical change?
- A. Melting ice
- B. Dissolving sugar in water
- C. Burning wood
- D. Crushing a can
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What is the pH scale used to measure?
- A. Temperature
- B. Concentration
- C. Acidity/alkalinity
- D. Volume
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An example of a compound is:
- A. Hydrogen
- B. Oxygen
- C. Water
- D. Nitrogen
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What does the atomic number represent?
- A. The total number of neutrons
- B. The total number of electrons
- C. The number of protons in an atom
- D. The mass of an atom
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Which of the following is not a pure substance?
- A. Salt
- B. Water
- C. Air
- D. Sugar
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What are the building blocks of matter?
- A. Elements
- B. Molecules
- C. Cells
- D. Atoms
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Which of the following is a noble gas?
- A. Oxygen
- B. Fluorine
- C. Neon
- D. Chlorine
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Which statement is true regarding mixtures?
- A. They have a fixed composition
- B. They can be separated by physical means
- C. They consist of only one substance
- D. They are also called compounds
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What is an exothermic reaction?
- A. A reaction that absorbs heat
- B. A reaction that releases heat
- C. A reaction that has no temperature change
- D. A reaction that occurs in water
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What is the chemical formula for table salt?
- A. HCl
- B. NaCl
- C. KCl
- D. CaCl2
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Which of the following elements is a halogen?
- A. Sodium
- B. Chlorine
- C. Iron
- D. Helium
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What is the phase change from solid to gas called?
- A. Condensation
- B. Sublimation
- C. Evaporation
- D. Melting
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Which of the following represents a physical change?
- A. Rusting of iron
- B. Baking a cake
- C. Freezing water
- D. Digestion of food
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The periodic table is organized by:
- A. Atomic mass
- B. Number of isotopes
- C. Atomic number
- D. State of matter
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What is a molecule?
- A. A group of atoms bonded together
- B. An atom of an element
- C. A compound made of two different elements
- D. A solution of multiple substances
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Which of the following elements is a metal?
- A. Sulfur
- B. Helium
- C. Copper
- D. Bromine
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What type of bond is formed when electrons are shared?
- A. Ionic bond
- B. Covalent bond
- C. Hydrogen bond
- D. Metallic bond
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What happens to the atoms in a chemical reaction?
- A. They are created and destroyed
- B. They rearrange to form new substances
- C. They disappear completely
- D. They change into energy
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Which of the following describes an alkali metal?
- A. Very reactive and found in groups 1
- B. Not reactive and found in group 18
- C. A good conductor of electricity
- D. All of the above
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What type of mixture has a uniform composition?
- A. Heterogeneous mixture
- B. Homogeneous mixture
- C. Colloid
- D. Suspension
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A chemical symbol represents:
- A. An element
- B. A compound
- C. A mixture
- D. A solution
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Which instrument is used to measure mass?
- A. Thermometer
- B. Ruler
- C. Balance scale
- D. Graduated cylinder
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What is the main component of air?
- A. Oxygen
- B. Nitrogen
- C. Carbon Dioxide
- D. Argon
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What is a common characteristic of acids?
- A. They feel slippery
- B. They taste bitter
- C. They turn blue litmus paper red
- D. They produce hydroxide ions in water
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What is an isotope?
- A. Atoms of the same element with different numbers of electrons
- B. Atoms of the same element with different numbers of protons
- C. Atoms of the same element with different numbers of neutrons
- D. Atoms of different elements
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Which process describes a liquid turning into a solid?
- A. Melting
- B. Freezing
- C. Boiling
- D. Condensing
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What is the result of a neutralization reaction?
- A. An acid and a base produce salt and water
- B. An acid and a base produce gas
- C. An acid and a metal produce hydrogen gas
- D. An acid and water produce heat