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AP Intermediate 1st Year Chemical Changes, Reactions & Atmospheric Pollution — practice questions

Explore 47 free Chemical Changes, Reactions & Atmospheric Pollution questions in AP Intermediate 1st Year Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Changes, Reactions & Atmospheric Pollution questions and exercises with answers

Showing questions 1–30 of 47.

Which is the lightest noble gas?Read the answer and worked solution →Why are alkali metals stored under kerosene?Read the answer and worked solution →Which property determines the position of an element in the periodic table?Read the answer and worked solution →Which family of elements is highly UNreactive?Read the answer and worked solution →Diagonal relationship is shown between:Read the answer and worked solution →In the modern periodic table, transition elements occupy:Read the answer and worked solution →Which element does NOT exist in nature?Read the answer and worked solution →One kilogram of ice at 0°C melts into water at 0°C. The latent heat of fusion for water is 334 kJ/kg. What is the increase in entropy of the ice during this melting?Read the answer and worked solution →When are two objects in contact said to be in thermal equilibrium?Read the answer and worked solution →The zeroth law of thermodynamics is compared to which mathematical property?Read the answer and worked solution →Why is the zeroth law of thermodynamics given a number lower than the first and second laws?Read the answer and worked solution →How is pressure defined in terms of force and area?Read the answer and worked solution →What is the SI unit of pressure?Read the answer and worked solution →In the ideal gas law PV = NkT, what does the symbol N represent?Read the answer and worked solution →What is the value of the Boltzmann constant k used in the ideal gas law?Read the answer and worked solution →A gas held at a constant pressure of 20 Pa expands, increasing its volume by 3.0 cubic metres. How much work does the gas do on its surroundings?Read the answer and worked solution →In a process, 25 J is transferred into a system by heat and 45 J is transferred out. What is the net heat transfer, Q?Read the answer and worked solution →In the first law equation, ΔU = Q minus W, what sign convention applies to Q and W?Read the answer and worked solution →What is internal energy, as defined for a physical system?Read the answer and worked solution →During photosynthesis, plants convert incoming solar radiation into which form of energy?Read the answer and worked solution →How does eating relate to the first law of thermodynamics, as applied to the human body?Read the answer and worked solution →What does entropy measure in a physical system?Read the answer and worked solution →1.00 kg of ice at 0 degrees Celsius (273 K) absorbs 3.34 x 10^5 J of heat while melting into water at 0 degrees Celsius. What is the increase in entropy?Read the answer and worked solution →3.00 kg of ice at 0 degrees Celsius (273 K) melts into water at 0 degrees Celsius. Using Lf(water) = 334 kJ/kg, what is the increase in entropy?Read the answer and worked solution →If 120 J of heat is transferred into a system at a constant temperature of 350 K, what is the change in entropy?Read the answer and worked solution →How much heat must transfer energy into a system at 400 K to produce an entropy change of 35 J/K?Read the answer and worked solution →Can the entropy of one part of the universe, such as a system built by doing work, ever decrease?Read the answer and worked solution →What does a heat engine do?Read the answer and worked solution →What is a cyclical process, as used to describe heat engines?Read the answer and worked solution →A heat engine is given 120 J of heat and releases 20 J of heat to the environment. How much work does it do?Read the answer and worked solution →

Worked practice questions

Which is the lightest noble gas?

  1. Argon
  2. Helium
  3. Neon
  4. Xenon
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Correct answer: B. Helium

1. Noble gases occupy Group 18. 2. The first member at the top of Group 18 is helium. 3. Helium has atomic mass 4. 4. So helium is the lightest noble gas. _Source: Selina Concise Chemistry ICSE Class 9, Ch 5 'The Periodic Table'_

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Why are alkali metals stored under kerosene?

  1. To make them harder in the standard view
  2. To increase melting point
  3. To prevent reaction with air and water
  4. To improve their colour
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Correct answer: C. To prevent reaction with air and water

1. Alkali metals react vigorously with both air and water. 2. They tarnish and may catch fire on contact. 3. Kerosene is a non-polar liquid that excludes air and moisture. 4. So alkali metals are kept under kerosene for safe storage. _Source: Selina Concise Chemistry ICSE Class 9, Ch 5 'The Periodic Table'_

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Which property determines the position of an element in the periodic table?

  1. Mass number
  2. Number of neutrons
  3. Density
  4. Atomic number
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Correct answer: D. Atomic number

1. The modern periodic law uses atomic number as the basis. 2. Elements with the same atomic number are the same element. 3. Position depends on electron configuration determined by atomic number. 4. So atomic number determines the position. _Source: Selina Concise Chemistry ICSE Class 9, Ch 5 'The Periodic Table'_

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More Chemistry topics

Structure of AtomEquilibriumChemical Bonding and Molecular StructureRedox ReactionsClassification of Elements and Periodicity in PropertiesHydrocarbonsSome Basic Concepts of ChemistryOrganic Chemistry: Some Basic Principles and Techniques