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Medium
November 2nd
Questions
What is the name of the process in which a solid directly transitions to a gas without passing through the liquid phase?
Which type of bond is formed between two atoms when they share a pair of electrons?
What is the name of the periodic table group that includes fluorine, chlorine, and bromine?
What is the law that states that the total mass of the reactants equals the total mass of the products in a chemical reaction?
What is the term for a substance that donates protons or accepts electrons during a chemical reaction?
Medium
October 8th
Questions
What type of chemical reaction occurs when two or more reactants combine to form a single product?
Which element is essential for the production of hemoglobin in the human body?
What is the term for the amount of solute dissolved in a given quantity of solvent?
Which gas is released as a byproduct during photosynthesis?
What is the name of the chemical group characterized by a carbon atom double-bonded to an oxygen atom?
Medium
October 4th
Questions
What is the name of the process by which a liquid turns into a gas specifically at its boiling point?
What is the molecular formula for the simplest alkene?
Which type of chemical bond involves the transfer of electrons between atoms?
What is the term for a catalyst in biological systems?
Which element has the lowest atomic number in the halogen group?
Medium
September 5th
Questions
Which element has the atomic number 26?
What is the term for a chemical bond where two atoms share electrons?
What is the main component of natural gas?
Which acid is commonly found in car batteries?
What is the chemical symbol for tungsten?
Medium
August 25th
Questions
What is the term for the energy required to remove an electron from an atom in its gaseous state?
Which type of reaction occurs when an acid reacts with a base to produce a salt and water?
What is the name of the effect in which a gas absorbs infrared radiation and contributes to the warming of Earth's atmosphere?
Which element has the highest electronegativity on the Pauling scale?
What is the term for the point at which the vapor pressure of a liquid equals the external pressure?
Medium
August 21st
Questions
What is the name of the bond formed when two atoms share a pair of electrons?
What is the term for the amount of mass contained in a given volume of a substance?
Which gas is commonly used to fill balloons because it is lighter than air and non-flammable?
What is the name of the process by which a liquid changes into a gas at a temperature below its boiling point?
Which element is commonly used in the manufacturing of batteries for its high electrochemical potential?
Medium
July 26th
Questions
What is the pH of a neutral solution at 25°C?
Which element is used as the filament in incandescent light bulbs?
What is the name of the process by which a gas turns directly into a solid without becoming a liquid?
What is the primary component of natural gas?
What is the term for a substance that speeds up a chemical reaction without being consumed in the process?
Medium
January 31st
Questions
What is the name of the process in which a solid changes directly into a gas without passing through the liquid phase?
Which element is the most abundant metal in the Earth's crust, often used in construction and packaging industries?
What is the chemical formula of the compound commonly known as table salt?
Which type of chemical reaction involves the combination of oxygen with another substance, often producing heat and light?
What term describes the type of chemical bond where electrons are shared equally between atoms?
Medium
January 20th
Questions
What is the term for the type of bond formed between a metal and a non-metal through the transfer of electrons?
Which element, commonly found in batteries, is represented by the symbol 'Li'?
What is the name of the law stating that the total energy in a closed system remains constant, regardless of the processes occurring within it?
Which chemical process involves the loss of electrons by a molecule, atom, or ion?
What is the common name for the group of elements in Group 17 of the periodic table, known for their high reactivity?
Medium
January 10th
Questions
What is the term for the type of reaction where a compound breaks down into two or more simpler substances?
Which element is represented by the chemical symbol 'Pb' on the periodic table?
What is the name of the rule that states atoms tend to combine in a way that each atom has eight electrons in its valence shell?
What term describes the amount of substance in a given volume, often expressed in moles per liter?
Which scientist is credited with the discovery of the electron?
Medium
January 1st
Questions
What is the term for a homogeneous mixture where one substance is dissolved evenly in another?
What is the name of the series of elements in the periodic table that are all radioactive and include uranium?
Which law states that at constant temperature, the volume of a gas is inversely proportional to its pressure?
What is the process of splitting a large atomic nucleus into smaller nuclei, releasing energy?
What is the name of the molecular geometry for a molecule that has a central atom bonded to three groups with no lone pairs?
Medium
December 14th
Questions
What is the term for the minimum energy required for a chemical reaction to occur between reacting particles?
Which type of chemical bond is formed when atoms share electrons unequally, resulting in partial positive and negative charges?
What is the term for the negatively charged ion formed when an atom gains one or more electrons?
Which principle states that no two electrons in an atom can have the same set of four quantum numbers?
What is the name of the process in which a solution is heated to remove a solvent, leaving behind a concentrated or solid residue?
Medium
December 14th
Questions
Which type of chemical reaction involves the exchange of ions between two compounds, resulting in the formation of new compounds?
What is the term for the amount of energy required to raise the temperature of one gram of a substance by one degree Celsius?
Which scientist is credited with proposing the atomic theory that states all matter is composed of tiny, indivisible particles called atoms?
What is the term for the vertical columns in the periodic table, which group elements with similar chemical properties?
What is the name of the negatively charged subatomic particle found in the outer regions of an atom?
Hard
November 27th
Questions
Which type of spectroscopy relies on the interaction of light with matter to measure the vibrational energy levels of molecules?
What is the name of the process in which isotopes are separated based on mass differences using a centrifugal force?
Which concept explains the phenomenon where electrons occupy the lowest available energy levels before filling higher levels?
Which process involves the addition of a hydrogen molecule across a carbon-carbon double bond, often using a metal catalyst?
What is the term for a solution's resistance to changes in pH when an acid or base is added, often involving a weak acid and its conjugate base?
Medium
November 27th
Questions
What is the molecular geometry of a methane (CH4) molecule, where the carbon atom is bonded to four hydrogen atoms?
Which element is commonly used as a semiconductor in electronic devices, known for its ability to conduct electricity under certain conditions?
What is the term for the amount of energy required to change 1 gram of a substance from a liquid to a gas at constant temperature?
Which law states that the pressure of a given mass of gas varies directly with its absolute temperature when the volume is kept constant?
In a chemical reaction, what is the term for the substance that is consumed and transformed into a different substance?
Medium
November 27th
Questions
In which type of reaction do two or more substances combine to form a more complex product, often requiring a catalyst or heat?
Which type of chemical bond involves the transfer of electrons from one atom to another, resulting in the formation of positively and negatively charged ions?
What is the name of the process in which a liquid turns into a gas at a temperature below its boiling point, often due to pressure changes?
Which term describes the energy required to remove an electron from an atom in its gaseous state, often measured in electron volts?
What is the common name for the group of elements in the periodic table known for being inert and having a complete valence electron shell?
Hard
May 22nd
Questions
Which scientist is known for the development of the modern periodic table, arranging elements by atomic number to emphasize periodic trends?
What is the term for a chemical bond that involves the sharing of electron pairs between atoms, leading to the formation of molecules?
In chemistry, what is the term for a substance that increases the rate of a chemical reaction without being consumed in the process?
Which chemical element, with the symbol 'Fe', is commonly used in the production of steel due to its strength and durability?
What is the term for the process by which a substance transitions directly from a solid to a gas without passing through the liquid phase?
Hard
May 5th
Questions
What is the term for a reaction in which a single compound breaks down into two or more simpler substances when heated?
Who is known for the discovery of the law of conservation of mass, laying the foundation for the modern science of chemistry?
What is the term for the study of the movement of substances across cell membranes, often involving diffusion and osmosis?
Which scientist is credited with the discovery of the first noble gas, argon, and for developing the periodic table of elements?
What is the term for the process of a substance transitioning directly from a solid to a gas without passing through the liquid phase?
Hard
April 25th
Questions
What is the term for the process of a solid changing directly into a gas without first becoming a liquid?
Who is credited with the discovery of the electron, known for his work with cathode rays and the plum pudding model of the atom?
What is the term for the process of a gas changing into a solid without becoming a liquid first?
Which chemical element has the highest boiling point among all elements, commonly used in nuclear reactors due to its high melting and boiling points?
Who is known for the development of the concept of coordination complexes, where a central metal atom is surrounded by ligands in a specific geometric arrangement?
Hard
April 8th
Questions
Which scientist is known for developing the concept of electronegativity, a measure of the tendency of an atom to attract a bonding pair of electrons?
What is the term for the process in which a liquid is converted into vapor at a temperature below its boiling point?
Which chemical element has the highest electronegativity value of all elements?
What is the term for the branch of chemistry that deals with the study of compounds containing carbon?
Which scientist is known for proposing the concept of orbital hybridization, explaining the shapes of molecules based on the mixing of atomic orbitals?
