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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?
Hard
March 14th
Questions
Which scientist proposed the concept of resonance to explain the behavior of molecules that cannot be accurately represented by a single structural formula?
What is the term for the study of the rates of chemical reactions, the mechanism by which reactions occur, and the factors that affect the speed of reactions?
Who discovered the element radium and polonium, pioneering research on radioactivity and leading to the development of the theory of atomic structure?
Which scientist is known for the development of VSEPR theory, a model used to predict the geometry of individual molecules based on the number of electron pairs around their central atoms?
What is the term for a chemical reaction that absorbs heat from its surroundings, resulting in a decrease in temperature?
Hard
March 11th
Questions
What is the process of a substance changing directly from a gas to a solid called?
What is the term for a reaction in which two compounds exchange ions to form two new compounds?
Which chemical element has the highest melting point of all the elements?
What is the term for a substance that speeds up a chemical reaction without being consumed in the process?
Who is credited with the discovery of radioactivity and the development of the theory of nuclear chemistry?
Hard
January 27th
Questions
What is the term for a type of chemical bond that forms between a metal and a non-metal?
Who formulated the modern concept of the chemical element and established the Law of Definite Proportions?
What is the name of the process where a substance changes directly from a solid to a gas without first becoming a liquid?
What is the term for the study of compounds containing carbon and their properties?
Who discovered that elements could exist in the form of isotopes?
Expert
November 16th
Questions
What is the term for the study of the structure, properties, and behavior of chemical compounds and the matter they are composed of?
Who is known as the father of modern chemistry?
What is the term for the minimum amount of energy required to start a chemical reaction?
What is the term for a substance that slows down the rate of a chemical reaction without being consumed in the process?
What is the term for the branch of chemistry that deals with the study of carbon compounds?
What is the term for a chemical bond that involves the sharing of electron pairs between atoms?
Which scientist is credited with the development of the periodic table of elements?
What is the term for the process of a substance changing directly from a solid to a gas without first becoming a liquid?
What is the term for the study of the nature and effects of poisons and the treatment of poisoning?
What is the term for the branch of chemistry that deals with the qualitative and quantitative determination of chemical elements and compounds?
Hard
October 20th
Questions
What is the term for the study of the quantitative relationships between reactants and products in chemical reactions?
Which element has the highest electronegativity value on the periodic table?
What is the term for a substance that can act as both an acid and a base?
Which gas is known as the 'laughing gas'?
What is the term for a chemical reaction that involves the combination of a fuel and an oxidizer with the release of heat and light?
Hard
October 20th
Questions
What is the term for the study of the interaction between light and matter?
What is the term for a reaction that takes place in both the forward and reverse directions simultaneously?
What is the process called when a liquid changes into a gas at a temperature below its boiling point?
What is the term for a substance that speeds up a chemical reaction by providing an alternative reaction pathway?
What is the principle behind the technique of nuclear magnetic resonance (NMR) spectroscopy?
Hard
October 1st
Questions
What is the process called when a substance absorbs light energy and releases it as heat?
What is the term for the process of converting a gas directly into a solid without first becoming a liquid?
What is the principle behind the technique of nuclear magnetic resonance (NMR) spectroscopy?
Which element has the highest melting point?
What is the term for a type of chemical reaction that involves the rearrangement of atoms to form new molecules?
Hard
October 1st
Questions
What is the term for a chemical reaction in which a substance combines with oxygen to produce heat and light?
What is the property of a substance that describes its ability to dissolve in a solvent?
What is the term for the process of separating the components of a mixture based on their boiling points?
What is the term for a substance that speeds up a chemical reaction by lowering the activation energy?
What is the term for the process of a solid directly changing into a gas without first becoming a liquid?
Hard
September 30th
Questions
What is the term for a chemical reaction in which two or more reactants combine to form a single product?
What is the principle behind the technique of nuclear magnetic resonance (NMR) spectroscopy?
What is the term for the process in which a substance changes directly from a gas to a solid without first becoming a liquid?
Which element has the highest electronegativity value on the periodic table?
What is the term for a substance that speeds up a chemical reaction without being consumed in the process?
Hard
September 22nd
Questions
What is the term for the process of a substance changing directly from a solid to a gas without first becoming a liquid?
What is the chemical formula for sulfuric acid?
What is the principle behind the technique of nuclear magnetic resonance (NMR) spectroscopy?
What is the term for a substance that can accept a proton (H+) or donate a pair of electrons?
What is the process called when a gas changes directly into a solid without first becoming a liquid?
Hard
August 18th
Questions
What is the term for the process of combining two or more elements to form a new substance?
Which gas is responsible for the smell of rotten eggs?
What is the term for a substance that can speed up a chemical reaction without being consumed in the process?
What is the process called when a substance changes directly from a gas to a solid without first becoming a liquid?
What is the term for the study of the rates at which chemical reactions occur and the factors that affect them?
Hard
August 15th
Questions
What is the term for the process of converting a solid directly into a gas without first becoming a liquid?
What is the principle behind the technique of nuclear magnetic resonance (NMR) spectroscopy?
What is the term for a type of chemical reaction that involves the transfer of electrons between reactants?
What is the chemical formula for sodium chloride?
What is the principle behind the technique of gas chromatography?
Medium
August 7th
Questions
What is the process called when a substance changes from a gas directly to a liquid without first becoming a solid?
What is the term for the number of protons in the nucleus of an atom?
What is the branch of chemistry that deals with the study of the properties, composition, and behavior of matter?
Medium
August 7th
Questions
What is the process called when a substance changes from a solid directly to a gas without first becoming a liquid?
What is the term for the measure of the acidity or alkalinity of a solution?
Which element is the most abundant in the Earth's crust?
Medium
August 7th
Questions
What is the process called when a substance changes from a gas directly to a solid without first becoming a liquid?
What is the term for a substance that can donate a pair of electrons to form a covalent bond?
What is the branch of chemistry that deals with the study of the properties and behavior of inorganic compounds?
Expert
August 6th
Questions
What is the process called when a liquid changes into a gas at a temperature below its boiling point?
What is the term for a substance that speeds up a chemical reaction without being consumed in the process?
What is the unit used to measure the concentration of a solution?
What is the process called when an atom gains electrons and becomes negatively charged?
What is the term for the minimum amount of energy required for a chemical reaction to occur?
What is the chemical symbol for the element with the atomic number 79?
What is the process called when a gas changes directly into a solid without first becoming a liquid?
What is the term for a substance that can accept a proton (H+) or donate a pair of electrons?
What is the process called when an atom loses electrons and becomes positively charged?
What is the term for a chemical reaction that releases energy in the form of light or heat?
